// Ivanti / RiskSense Host Findings Routes
// Stores individual finding rows in PostgreSQL `ivanti_findings` table.
// Notes and overrides are columns on the same table (no separate tables needed).
// Daily auto-sync fetches from Ivanti API and upserts rows.

const express = require('express');
const { requireGroup } = require('../middleware/auth');
const { ivantiPost } = require('../helpers/ivantiApi');
const pool = require('../db');

const SYNC_INTERVAL_MS = 24 * 60 * 60 * 1000;

// PostgreSQL DATE columns return JS Date objects — normalize to 'YYYY-MM-DD' strings
function formatDate(val) {
    if (!val) return null;
    if (val instanceof Date) {
        const y = val.getFullYear();
        const m = String(val.getMonth() + 1).padStart(2, '0');
        const d = String(val.getDate()).padStart(2, '0');
        return `${y}-${m}-${d}`;
    }
    // Already a string — strip any time portion (e.g. "2025-05-22T00:00:00.000Z")
    return String(val).slice(0, 10);
}

// Configurable BU filter — broadened via env var to support multi-tenancy.
// Users see only their assigned teams' findings (filtered at query time).
const BU_FILTER_VALUE = process.env.IVANTI_BU_FILTER || 'NTS-AEO-ACCESS-ENG,NTS-AEO-STEAM';

const FINDINGS_FILTERS = [
    // NOTE: This filters for Open findings only — Closed count is fetched separately via syncClosedCount()
    {
        field: 'assetCustomAttributes.1550_host_1.value',
        exclusive: false,
        operator: 'IN',
        orWithPrevious: false,
        implicitFilters: [],
        value: BU_FILTER_VALUE,
        caseSensitive: false
    },
    {
        field: 'severity',
        exclusive: false,
        operator: 'RANGE',
        orWithPrevious: false,
        implicitFilters: [],
        value: '8.5,9.9',
        caseSensitive: false
    },
    {
        field: 'generic_state',
        exclusive: false,
        operator: 'EXACT',
        orWithPrevious: false,
        implicitFilters: [],
        value: 'Open',
        caseSensitive: false
    }
];

// Same BU + severity filters but for Closed state — used only to fetch the total count
const CLOSED_COUNT_FILTERS = [
    {
        field: 'assetCustomAttributes.1550_host_1.value',
        exclusive: false,
        operator: 'IN',
        orWithPrevious: false,
        implicitFilters: [],
        value: BU_FILTER_VALUE,
        caseSensitive: false
    },
    {
        field: 'severity',
        exclusive: false,
        operator: 'RANGE',
        orWithPrevious: false,
        implicitFilters: [],
        value: '8.5,9.9',
        caseSensitive: false
    },
    {
        field: 'generic_state',
        exclusive: false,
        operator: 'EXACT',
        orWithPrevious: false,
        implicitFilters: [],
        value: 'Closed',
        caseSensitive: false
    }
];

// ---------------------------------------------------------------------------
// Extract only the fields we need from a raw finding object
// ---------------------------------------------------------------------------
function extractFinding(f) {
    // statusEmbedded.dueDate = "2026-03-06T00:00:00" — strip to date part
    const rawDueDate = f.statusEmbedded?.dueDate || '';
    const dueDate = rawDueDate ? rawDueDate.split('T')[0] : '';

    // BU ownership: assetCustomAttributes['1550_host_1'] is an array like ["NTS-AEO-STEAM"]
    const buOwnership = f.assetCustomAttributes?.['1550_host_1']?.[0] || '';

    // CVE list: vulnerabilities.vulnInfoList[].cve
    const cves = (f.vulnerabilities?.vulnInfoList || []).map(v => v.cve).filter(Boolean);

    // Workflow: only capture FP# (False Positive) tickets — SYS# are auto-generated
    // system workflows and not actionable for our purposes.
    const wfDist = f.workflowDistribution || {};
    const fpBuckets = [
        ...(wfDist.actionableWorkflows || []),
        ...(wfDist.requestedWorkflows  || []),
        ...(wfDist.reworkedWorkflows   || []),
        ...(wfDist.rejectedWorkflows   || []),
        ...(wfDist.expiredWorkflows    || []),
        ...(wfDist.approvedWorkflows   || []),
    ].filter(w => (w.generatedId || '').startsWith('FP#'));

    // Priority: actionable > requested > reworked > rejected > expired > approved
    const fpEntry = fpBuckets[0] || null;

    // Fallback: if no FP# in distribution, check workflowGeneratedNames directly
    const generatedNames = f.workflowGeneratedNames || [];
    const fpFromNames = !fpEntry
        ? generatedNames.find(n => n.startsWith('FP#')) || null
        : null;

    const workflow = fpEntry ? {
        id:    fpEntry.generatedId || '',
        state: fpEntry.state || '',
        type:  'FP',
    } : fpFromNames ? {
        id:    fpFromNames,
        state: '',
        type:  'FP',
    } : null;

    return {
        id: String(f.id),
        hostId: f.host?.hostId || null,
        title: f.title || '',
        severity: typeof f.severity === 'number' ? f.severity : parseFloat(f.severity) || 0,
        vrrGroup: f.vrrGroup || f.severityGroup || '',
        hostName: f.host?.hostName || '',
        ipAddress: f.host?.ipAddress || '',
        dns: f.dns || f.host?.fqdn || '',
        status: f.status || '',
        slaStatus: f.slaStatus || '',
        dueDate,
        lastFoundOn: f.lastFoundOn || '',
        buOwnership,
        cves,
        workflow
    };
}

// ---------------------------------------------------------------------------
// Extract FP workflow id+state from a raw (un-extracted) finding
// Returns { id, state } or null if no FP# workflow present.
// ---------------------------------------------------------------------------
function extractFPWorkflow(f) {
    const wfDist = f.workflowDistribution || {};
    const fpBuckets = [
        ...(wfDist.actionableWorkflows || []),
        ...(wfDist.requestedWorkflows  || []),
        ...(wfDist.reworkedWorkflows   || []),
        ...(wfDist.rejectedWorkflows   || []),
        ...(wfDist.expiredWorkflows    || []),
        ...(wfDist.approvedWorkflows   || []),
    ].filter(w => (w.generatedId || '').startsWith('FP#'));
    const fpEntry = fpBuckets[0] || null;
    if (!fpEntry) return null;
    return { id: fpEntry.generatedId || '', state: fpEntry.state || 'Unknown' };
}

// ---------------------------------------------------------------------------
// Batch upsert findings into ivanti_findings table
// Preserves note and override_* columns (user data) during upsert.
// ---------------------------------------------------------------------------
async function upsertFindingsBatch(findings, state) {
    if (findings.length === 0) return;

    const BATCH_SIZE = 100;
    for (let i = 0; i < findings.length; i += BATCH_SIZE) {
        const batch = findings.slice(i, i + BATCH_SIZE);
        const values = [];
        const placeholders = [];

        batch.forEach((f, idx) => {
            const offset = idx * 18;
            values.push(
                f.id,
                f.hostId,
                f.title || '',
                f.severity || 0,
                f.vrrGroup || '',
                f.hostName || '',
                f.ipAddress || '',
                f.dns || '',
                f.status || '',
                f.slaStatus || '',
                f.dueDate || null,
                f.lastFoundOn || null,
                f.buOwnership || '',
                f.cves || [],
                f.workflow ? f.workflow.id : null,
                f.workflow ? f.workflow.state : null,
                f.workflow ? f.workflow.type : null,
                state
            );
            placeholders.push(
                `($${offset+1}, $${offset+2}, $${offset+3}, $${offset+4}, $${offset+5}, ` +
                `$${offset+6}, $${offset+7}, $${offset+8}, $${offset+9}, $${offset+10}, ` +
                `$${offset+11}, $${offset+12}, $${offset+13}, $${offset+14}, $${offset+15}, ` +
                `$${offset+16}, $${offset+17}, $${offset+18})`
            );
        });

        await pool.query(`
            INSERT INTO ivanti_findings (
                id, host_id, title, severity, vrr_group,
                host_name, ip_address, dns, status, sla_status,
                due_date, last_found_on, bu_ownership, cves,
                workflow_id, workflow_state, workflow_type, state
            )
            VALUES ${placeholders.join(', ')}
            ON CONFLICT (id) DO UPDATE SET
                host_id = EXCLUDED.host_id,
                title = EXCLUDED.title,
                severity = EXCLUDED.severity,
                vrr_group = EXCLUDED.vrr_group,
                host_name = EXCLUDED.host_name,
                ip_address = EXCLUDED.ip_address,
                dns = EXCLUDED.dns,
                status = EXCLUDED.status,
                sla_status = EXCLUDED.sla_status,
                due_date = EXCLUDED.due_date,
                last_found_on = EXCLUDED.last_found_on,
                bu_ownership = EXCLUDED.bu_ownership,
                cves = EXCLUDED.cves,
                workflow_id = EXCLUDED.workflow_id,
                workflow_state = EXCLUDED.workflow_state,
                workflow_type = EXCLUDED.workflow_type,
                state = EXCLUDED.state,
                synced_at = NOW()
        `, values);
    }
}

// ---------------------------------------------------------------------------
// Archive detection — compare previous vs current findings to detect state changes
// ---------------------------------------------------------------------------
async function detectArchiveChanges(previousFindings, currentFindings) {
    const previousIds = new Set(previousFindings.map(f => String(f.id)));
    const currentIds = new Set(currentFindings.map(f => String(f.id)));

    // Build lookup maps for metadata
    const previousMap = new Map(previousFindings.map(f => [String(f.id), f]));
    const currentMap = new Map(currentFindings.map(f => [String(f.id), f]));

    // 1. Disappeared findings: in previous but not in current → ARCHIVED
    const disappearedIds = [...previousIds].filter(id => !currentIds.has(id));

    for (const id of disappearedIds) {
        const finding = previousMap.get(id);
        const title = finding.title || '';
        const hostName = finding.hostName || finding.host_name || '';
        const ipAddress = finding.ipAddress || finding.ip_address || '';
        const severity = typeof finding.severity === 'number' ? finding.severity : 0;

        try {
            const { rows } = await pool.query(
                `SELECT id, current_state FROM ivanti_finding_archives WHERE finding_id = $1`,
                [id]
            );
            const existing = rows[0];

            if (existing && existing.current_state === 'RETURNED') {
                // Re-disappeared: RETURNED → ARCHIVED
                await pool.query(
                    `UPDATE ivanti_finding_archives
                     SET current_state = 'ARCHIVED', last_severity = $1, last_transition_at = NOW()
                     WHERE id = $2`,
                    [severity, existing.id]
                );
                await pool.query(
                    `INSERT INTO ivanti_archive_transitions (archive_id, from_state, to_state, severity_at_transition, reason, transitioned_at)
                     VALUES ($1, 'RETURNED', 'ARCHIVED', $2, 'severity_score_drift', NOW())`,
                    [existing.id, severity]
                );
                console.log(`[Archive Detection] Finding ${id} re-archived (RETURNED → ARCHIVED)`);
            } else if (!existing) {
                // First disappearance: NONE → ARCHIVED
                const { rows: insertRows } = await pool.query(
                    `INSERT INTO ivanti_finding_archives (finding_id, finding_title, host_name, ip_address, current_state, last_severity, first_archived_at, last_transition_at)
                     VALUES ($1, $2, $3, $4, 'ARCHIVED', $5, NOW(), NOW()) RETURNING id`,
                    [id, title, hostName, ipAddress, severity]
                );
                const archiveId = insertRows[0].id;
                await pool.query(
                    `INSERT INTO ivanti_archive_transitions (archive_id, from_state, to_state, severity_at_transition, reason, transitioned_at)
                     VALUES ($1, 'NONE', 'ARCHIVED', $2, 'severity_score_drift', NOW())`,
                    [archiveId, severity]
                );
                console.log(`[Archive Detection] Finding ${id} archived (NONE → ARCHIVED)`);
            }
            // If existing state is ARCHIVED or CLOSED, no action needed
        } catch (err) {
            console.error(`[Archive Detection] Error processing disappeared finding ${id}:`, err.message);
        }
    }

    // 2. Returned findings: in current AND has existing ARCHIVED record → RETURNED
    const returnedArchiveIds = [];
    try {
        const { rows: archivedRecords } = await pool.query(
            `SELECT id, finding_id FROM ivanti_finding_archives WHERE current_state = 'ARCHIVED'`
        );

        for (const record of archivedRecords) {
            if (currentIds.has(record.finding_id)) {
                const finding = currentMap.get(record.finding_id);
                const severity = typeof finding.severity === 'number' ? finding.severity : 0;

                await pool.query(
                    `UPDATE ivanti_finding_archives
                     SET current_state = 'RETURNED', last_severity = $1, last_transition_at = NOW()
                     WHERE id = $2`,
                    [severity, record.id]
                );
                await pool.query(
                    `INSERT INTO ivanti_archive_transitions (archive_id, from_state, to_state, severity_at_transition, reason, transitioned_at)
                     VALUES ($1, 'ARCHIVED', 'RETURNED', $2, 'reappeared_in_sync', NOW())`,
                    [record.id, severity]
                );
                returnedArchiveIds.push(record.id);
                console.log(`[Archive Detection] Finding ${record.finding_id} returned (ARCHIVED → RETURNED)`);
            }
        }
    } catch (err) {
        console.error('[Archive Detection] Error processing returned findings:', err.message);
    }

    // Count returned findings for anomaly summary
    let returnedCount = returnedArchiveIds.length;

    // Classify returned findings
    const returnClassification = { bu_reassignment: 0, severity_drift: 0, closed_on_platform: 0, decommissioned: 0 };
    for (const archiveId of returnedArchiveIds) {
        try {
            const { rows } = await pool.query(
                `SELECT reason FROM ivanti_archive_transitions
                 WHERE archive_id = $1 AND to_state = 'ARCHIVED'
                   AND transitioned_at <= NOW()
                 ORDER BY transitioned_at DESC LIMIT 1`,
                [archiveId]
            );
            const transition = rows[0];
            if (transition && transition.reason) {
                const reasonKey = transition.reason.split(':')[0];
                if (reasonKey in returnClassification) {
                    returnClassification[reasonKey]++;
                }
            }
        } catch (err) {
            // Non-fatal — skip this finding's classification
        }
    }

    console.log(`[Archive Detection] Processed ${disappearedIds.length} disappeared, ${returnedCount} returned`);
    if (returnedCount > 0) {
        console.log(`[Archive Detection] Return classification:`, returnClassification);
    }

    return { disappearedIds, returnedCount, returnClassification };
}

// ---------------------------------------------------------------------------
// Closed finding detection — check archived/returned findings against Ivanti closed set
// ---------------------------------------------------------------------------
async function detectClosedFindings(closedFindingIds) {
    if (!closedFindingIds || closedFindingIds.length === 0) return;

    const closedSet = new Set(closedFindingIds.map(String));

    try {
        const { rows: records } = await pool.query(
            `SELECT id, finding_id, current_state, last_severity FROM ivanti_finding_archives WHERE current_state IN ('ARCHIVED', 'RETURNED')`
        );

        let closedCount = 0;
        for (const record of records) {
            if (!closedSet.has(record.finding_id)) continue;

            try {
                await pool.query(
                    `UPDATE ivanti_finding_archives
                     SET current_state = 'CLOSED', last_transition_at = NOW()
                     WHERE id = $1`,
                    [record.id]
                );
                await pool.query(
                    `INSERT INTO ivanti_archive_transitions (archive_id, from_state, to_state, severity_at_transition, reason, transitioned_at)
                     VALUES ($1, $2, 'CLOSED', $3, 'remediated_in_ivanti', NOW())`,
                    [record.id, record.current_state, record.last_severity || 0]
                );
                closedCount++;
                console.log(`[Archive Detection] Finding ${record.finding_id} closed (${record.current_state} → CLOSED)`);
            } catch (err) {
                console.error(`[Archive Detection] Error closing finding ${record.finding_id}:`, err.message);
            }
        }

        console.log(`[Archive Detection] Closed ${closedCount} findings as remediated`);
    } catch (err) {
        console.error('[Archive Detection] Error querying archive records for closed detection:', err.message);
    }
}

// ---------------------------------------------------------------------------
// Closed-gone detection — find archive CLOSED findings that vanished from the
// Ivanti closed API set.
// ---------------------------------------------------------------------------
async function detectClosedGoneFindings(closedFindingIds) {
    if (!closedFindingIds) return;

    const closedSet = new Set(closedFindingIds.map(String));

    try {
        const { rows: records } = await pool.query(
            `SELECT id, finding_id, last_severity FROM ivanti_finding_archives WHERE current_state = 'CLOSED'`
        );

        let goneCount = 0;
        for (const record of records) {
            if (closedSet.has(record.finding_id)) continue;

            try {
                await pool.query(
                    `UPDATE ivanti_finding_archives
                     SET current_state = 'CLOSED_GONE', last_transition_at = NOW()
                     WHERE id = $1`,
                    [record.id]
                );
                await pool.query(
                    `INSERT INTO ivanti_archive_transitions (archive_id, from_state, to_state, severity_at_transition, reason, transitioned_at)
                     VALUES ($1, 'CLOSED', 'CLOSED_GONE', $2, 'disappeared_from_closed_set', NOW())`,
                    [record.id, record.last_severity || 0]
                );
                goneCount++;
            } catch (err) {
                console.error(`[Archive Detection] Error marking finding ${record.finding_id} as CLOSED_GONE:`, err.message);
            }
        }

        if (goneCount > 0) {
            console.warn(`[Archive Detection] ${goneCount} previously-closed findings disappeared from the Ivanti closed set (CLOSED → CLOSED_GONE)`);
        }
    } catch (err) {
        console.error('[Archive Detection] Error in closed-gone detection:', err.message);
    }
}

// ---------------------------------------------------------------------------
// Fetch closed findings from Ivanti and upsert + update counts
// ---------------------------------------------------------------------------
async function syncClosedCount(openCount, apiKey, clientId, skipTls) {
    const urlPath = `/client/${encodeURIComponent(clientId)}/hostFinding/search`;
    try {
        const body = {
            filters: CLOSED_COUNT_FILTERS,
            projection: 'internal',
            sort: [{ field: 'severity', direction: 'ASC' }],
            page: 0,
            size: 100
        };

        const result = await ivantiPost(urlPath, body, apiKey, skipTls);
        if (result.status !== 200) throw new Error(`Closed count API returned status ${result.status}`);

        const data = JSON.parse(result.body);
        const closedCount = data.page?.totalElements ?? data.page?.total ?? 0;
        const totalPages = data.page?.totalPages || 1;

        // Collect closed findings for upsert and archive detection
        const closedFindings = [];
        const closedFindingIds = [];
        const firstPageFindings = data._embedded?.hostFindings || [];
        firstPageFindings.forEach(f => {
            if (f.id) closedFindingIds.push(String(f.id));
            closedFindings.push(extractFinding(f));
        });

        // Fetch remaining pages to collect all closed findings
        for (let pg = 1; pg < totalPages; pg++) {
            try {
                const pageBody = { ...body, page: pg };
                const pageResult = await ivantiPost(urlPath, pageBody, apiKey, skipTls);
                if (pageResult.status !== 200) break;
                const pageData = JSON.parse(pageResult.body);
                const pageFindings = pageData._embedded?.hostFindings || [];
                pageFindings.forEach(f => {
                    if (f.id) closedFindingIds.push(String(f.id));
                    closedFindings.push(extractFinding(f));
                });
            } catch (err) {
                console.error(`[Ivanti Findings] Failed to fetch closed findings page ${pg}:`, err.message);
                break;
            }
        }

        // Upsert closed findings as individual rows with state='closed'
        await upsertFindingsBatch(closedFindings, 'closed');

        // Update counts cache
        await pool.query(
            `UPDATE ivanti_counts_cache SET open_count=$1, closed_count=$2, synced_at=NOW() WHERE id=1`,
            [openCount, closedCount]
        );

        // Drift guard — if the new total drops by more than 50% compared to the
        // most recent history snapshot, skip writing to history.
        const newTotal = openCount + closedCount;
        let skipHistory = false;
        try {
            const { rows } = await pool.query(
                `SELECT open_count, closed_count FROM ivanti_counts_history ORDER BY recorded_at DESC LIMIT 1`
            );
            const prev = rows[0];
            if (prev) {
                const prevTotal = (prev.open_count || 0) + (prev.closed_count || 0);
                if (prevTotal > 0 && newTotal < prevTotal * 0.5) {
                    console.warn(`[Ivanti Findings] Drift guard triggered — new total ${newTotal} is <50% of previous ${prevTotal}. Skipping history write.`);
                    skipHistory = true;
                }
            }
        } catch (err) {
            console.error('[Ivanti Findings] Drift guard check failed (non-fatal):', err.message);
        }

        if (!skipHistory) {
            await pool.query(
                `INSERT INTO ivanti_counts_history (open_count, closed_count) VALUES ($1, $2)`,
                [openCount, closedCount]
            );

            // Per-BU history snapshot — enables scoped trend lines
            try {
                await pool.query(`
                    INSERT INTO ivanti_counts_history_by_bu (bu_ownership, state, count)
                    SELECT bu_ownership, state, COUNT(*)
                    FROM ivanti_findings
                    WHERE bu_ownership != ''
                    GROUP BY bu_ownership, state
                `);
            } catch (err) {
                console.error('[Ivanti Findings] Per-BU history snapshot failed (non-fatal):', err.message);
            }
        }

        console.log(`[Ivanti Findings] Counts updated — open: ${openCount}, closed: ${closedCount}${skipHistory ? ' (history write skipped — drift guard)' : ''}`);

        // Detect closed findings in the archive
        try {
            await detectClosedFindings(closedFindingIds);
        } catch (err) {
            console.error('[Ivanti Findings] Closed finding archive detection failed (non-fatal):', err.message);
        }

        // Detect findings that vanished from the closed set — CLOSED → CLOSED_GONE
        try {
            await detectClosedGoneFindings(closedFindingIds);
        } catch (err) {
            console.error('[Ivanti Findings] Closed-gone detection failed (non-fatal):', err.message);
        }
    } catch (err) {
        console.error('[Ivanti Findings] Failed to fetch closed count:', err.message);
        // Still update open count so it stays in sync; leave closed_count as-is
        await pool.query(
            `UPDATE ivanti_counts_cache SET open_count=$1, synced_at=NOW() WHERE id=1`,
            [openCount]
        ).catch(() => {});
    }
}

// ---------------------------------------------------------------------------
// Sync FP stats across ALL findings (open + closed).
// ---------------------------------------------------------------------------
async function syncFPWorkflowCounts(openFindings, apiKey, clientId, skipTls) {
    const findingCounts = {};  // state → # findings
    const fpIdMap       = {};  // FP# id → state (deduplicates across findings)

    // Seed from open findings (already extracted, have workflow.id + workflow.state)
    openFindings.forEach(f => {
        if (!f.workflow) return;
        const state = f.workflow.state || 'Unknown';
        const id    = f.workflow.id    || '';
        findingCounts[state] = (findingCounts[state] || 0) + 1;
        if (id && !fpIdMap[id]) fpIdMap[id] = state;
    });

    // Sweep closed findings to pick up Approved (and any other closed FP states)
    const urlPath = `/client/${encodeURIComponent(clientId)}/hostFinding/search`;
    let page = 0;
    let totalPages = 1;

    try {
        do {
            const body = {
                filters: CLOSED_COUNT_FILTERS,
                projection: 'internal',
                sort: [{ field: 'severity', direction: 'ASC' }],
                page,
                size: 100
            };
            const result = await ivantiPost(urlPath, body, apiKey, skipTls);
            if (result.status !== 200) {
                console.warn(`[Ivanti Findings] FP workflow counts: closed findings page ${page} returned ${result.status} — stopping sweep`);
                break;
            }
            const data = JSON.parse(result.body);
            totalPages = data.page?.totalPages || 1;
            const findings = data._embedded?.hostFindings || [];
            findings.forEach(f => {
                const wf = extractFPWorkflow(f);
                if (!wf) return;
                findingCounts[wf.state] = (findingCounts[wf.state] || 0) + 1;
                if (wf.id && !fpIdMap[wf.id]) fpIdMap[wf.id] = wf.state;
            });
            console.log(`[Ivanti Findings] FP workflow counts: closed page ${page + 1}/${totalPages}`);
            page++;
        } while (page < totalPages);
    } catch (err) {
        console.error('[Ivanti Findings] FP workflow counts: closed sweep failed:', err.message);
    }

    // Aggregate unique FP# IDs by state
    const idCounts = {};
    Object.values(fpIdMap).forEach(state => {
        idCounts[state] = (idCounts[state] || 0) + 1;
    });

    await pool.query(
        `UPDATE ivanti_counts_cache SET fp_workflow_counts_json=$1, fp_id_counts_json=$2 WHERE id=1`,
        [JSON.stringify(findingCounts), JSON.stringify(idCounts)]
    ).catch(e => console.error('[Ivanti Findings] Failed to store FP workflow counts:', e.message));

    console.log('[Ivanti Findings] FP finding counts:', findingCounts);
    console.log('[Ivanti Findings] FP workflow ID counts:', idCounts);
}

// ---------------------------------------------------------------------------
// BU Drift Checker — post-sync classification of newly archived findings
// ---------------------------------------------------------------------------
// Managed BUs for drift classification — derived from IVANTI_MANAGED_BUS env var.
// Findings leaving these BUs are classified as bu_reassignment.
// Each tenant deployment sets this to their own managed teams.
const MANAGED_BUS_VALUE = process.env.IVANTI_MANAGED_BUS || 'NTS-AEO-ACCESS-ENG,NTS-AEO-STEAM';
const EXPECTED_BUS = new Set(MANAGED_BUS_VALUE.split(',').map(b => b.trim()).filter(Boolean));

async function runBUDriftChecker(newlyArchivedIds, apiKey, clientId, skipTls) {
    const summary = { bu_reassignment: 0, severity_drift: 0, closed_on_platform: 0, decommissioned: 0 };

    if (!newlyArchivedIds || newlyArchivedIds.length === 0) return summary;

    const urlPath = `/client/${encodeURIComponent(clientId)}/hostFinding/search`;
    const chunkSize = 50;

    const foundMap = new Map();

    for (let i = 0; i < newlyArchivedIds.length; i += chunkSize) {
        const chunk = newlyArchivedIds.slice(i, i + chunkSize);
        const idList = chunk.join(',');

        try {
            const filters = [
                {
                    field: 'id',
                    exclusive: false,
                    operator: 'IN',
                    orWithPrevious: false,
                    implicitFilters: [],
                    value: idList,
                    caseSensitive: false
                }
            ];

            let page = 0;
            let totalPages = 1;

            do {
                const body = {
                    filters,
                    projection: 'internal',
                    sort: [{ field: 'severity', direction: 'ASC' }],
                    page,
                    size: 100
                };

                const result = await ivantiPost(urlPath, body, apiKey, skipTls);
                if (result.status !== 200) {
                    console.error(`[BU Drift Checker] API returned status ${result.status} for batch starting at index ${i}`);
                    break;
                }

                const data = JSON.parse(result.body);
                totalPages = data.page?.totalPages || 1;
                const findings = data._embedded?.hostFindings || [];

                for (const f of findings) {
                    const bu = f.assetCustomAttributes?.['1550_host_1']?.[0] || 'UNKNOWN';
                    const severity = typeof f.severity === 'number' ? f.severity : parseFloat(f.severity) || 0;
                    const state = f.status || f.generic_state || '';
                    foundMap.set(String(f.id), { bu, severity, state });
                }

                page++;
            } while (page < totalPages);

            console.log(`[BU Drift Checker] Batch ${Math.floor(i / chunkSize) + 1}: queried ${chunk.length} IDs, found ${foundMap.size} so far`);
        } catch (err) {
            console.error(`[BU Drift Checker] Error querying batch at index ${i}:`, err.message);
        }
    }

    // Classify each archived finding and update the archive transition reason
    for (const id of newlyArchivedIds) {
        const found = foundMap.get(id);
        let classification;
        let reason;

        if (!found) {
            classification = 'decommissioned';
            reason = 'decommissioned';
        } else if (!EXPECTED_BUS.has(found.bu)) {
            classification = 'bu_reassignment';
            reason = `bu_reassignment:${found.bu}`;
        } else if (found.severity < 8.5) {
            classification = 'severity_drift';
            reason = `severity_drift:${found.severity}`;
        } else if (found.state === 'Closed') {
            classification = 'closed_on_platform';
            reason = 'closed_on_platform';
        } else {
            classification = 'decommissioned';
            reason = 'decommissioned';
        }

        summary[classification] = (summary[classification] || 0) + 1;

        // Update the most recent archive transition reason for this finding
        try {
            const { rows } = await pool.query(
                `SELECT id FROM ivanti_finding_archives WHERE finding_id = $1`,
                [id]
            );
            const archive = rows[0];
            if (archive) {
                await pool.query(
                    `UPDATE ivanti_archive_transitions SET reason = $1
                     WHERE archive_id = $2 AND id = (
                         SELECT id FROM ivanti_archive_transitions
                         WHERE archive_id = $3 ORDER BY transitioned_at DESC LIMIT 1
                     )`,
                    [reason, archive.id, archive.id]
                );
            }
        } catch (err) {
            console.error(`[BU Drift Checker] Error updating transition reason for finding ${id}:`, err.message);
        }
    }

    console.log(`[BU Drift Checker] Classification complete:`, summary);
    return summary;
}

// ---------------------------------------------------------------------------
// Anomaly Summary — compute and store post-sync anomaly report
// ---------------------------------------------------------------------------
async function computeAnomalySummary(openCountDelta, closedCountDelta, newlyArchivedCount, returnedCount, classificationBreakdown, returnClassificationBreakdown) {
    try {
        const isSignificant = newlyArchivedCount > 5;
        const classificationJson = JSON.stringify(classificationBreakdown || {});
        const returnClassificationJson = JSON.stringify(returnClassificationBreakdown || {});

        await pool.query(
            `INSERT INTO ivanti_sync_anomaly_log
             (sync_timestamp, open_count_delta, closed_count_delta, newly_archived_count, returned_count, classification_json, return_classification_json, is_significant)
             VALUES (NOW(), $1, $2, $3, $4, $5, $6, $7)`,
            [openCountDelta, closedCountDelta, newlyArchivedCount, returnedCount, classificationJson, returnClassificationJson, isSignificant]
        );

        console.log(`[Anomaly Summary] Sync anomaly logged — open_delta: ${openCountDelta}, closed_delta: ${closedCountDelta}, archived: ${newlyArchivedCount}, returned: ${returnedCount}, significant: ${isSignificant}`);
        console.log(`[Anomaly Summary] Classification:`, classificationBreakdown);
        if (returnedCount > 0) {
            console.log(`[Anomaly Summary] Return classification:`, returnClassificationBreakdown);
        }
    } catch (err) {
        console.error('[Anomaly Summary] Failed to write anomaly summary (non-fatal):', err.message);
    }
}

// ---------------------------------------------------------------------------
// Core sync — fetches ALL pages, upserts individual rows into ivanti_findings
// ---------------------------------------------------------------------------
async function syncFindings() {
    const apiKey = process.env.IVANTI_API_KEY;
    const clientId = process.env.IVANTI_CLIENT_ID || '1550';
    const skipTls = process.env.IVANTI_SKIP_TLS === 'true';

    if (!apiKey) {
        const errMsg = 'IVANTI_API_KEY not set in .env — skipping sync';
        console.warn('[Ivanti Findings]', errMsg);
        await pool.query(
            `UPDATE ivanti_sync_state SET sync_status='error', error_message=$1, synced_at=NOW() WHERE id=1`,
            [errMsg]
        );
        return;
    }

    console.log('[Ivanti Findings] Starting sync...');

    const urlPath = `/client/${encodeURIComponent(clientId)}/hostFinding/search`;
    let allFindings = [];
    let page = 0;
    let totalPages = 1;

    try {
        do {
            const body = {
                filters: FINDINGS_FILTERS,
                projection: 'internal',
                sort: [{ field: 'severity', direction: 'ASC' }],
                page,
                size: 100
            };

            const result = await ivantiPost(urlPath, body, apiKey, skipTls);

            if (result.status === 401) throw new Error('Invalid or missing API key (401)');
            if (result.status === 419) throw new Error('Insufficient privileges (419) — API key lacks hostFinding access');
            if (result.status === 429) throw new Error('Rate limited (429) — try again later');
            if (result.status !== 200) throw new Error(`Ivanti API returned status ${result.status}`);

            const data = JSON.parse(result.body);
            totalPages = data.page?.totalPages || 1;
            const findings = data._embedded?.hostFindings || [];
            allFindings = allFindings.concat(findings.map(extractFinding));

            console.log(`[Ivanti Findings] Page ${page + 1}/${totalPages} — ${allFindings.length} findings so far`);
            page++;
        } while (page < totalPages);

        // Read previous open findings from DB for archive detection
        let previousFindings = [];
        try {
            const { rows } = await pool.query(
                `SELECT id, title, host_name AS "hostName", ip_address AS "ipAddress", severity, bu_ownership AS "buOwnership"
                 FROM ivanti_findings WHERE state = 'open'`
            );
            previousFindings = rows;
        } catch (err) {
            console.error('[Ivanti Findings] Failed to read previous findings for archive detection:', err.message);
        }

        // Per-finding BU comparison — detect BU changes across syncs
        try {
            const previousMap = new Map(previousFindings.map(f => [String(f.id), f]));
            for (const finding of allFindings) {
                try {
                    const prev = previousMap.get(String(finding.id));
                    if (prev && prev.buOwnership && finding.buOwnership && prev.buOwnership !== finding.buOwnership) {
                        await pool.query(
                            `INSERT INTO ivanti_finding_bu_history (finding_id, finding_title, host_name, previous_bu, new_bu, detected_at)
                             VALUES ($1, $2, $3, $4, $5, NOW())`,
                            [String(finding.id), finding.title || '', finding.hostName || '', prev.buOwnership, finding.buOwnership]
                        );
                        console.log(`[BU Tracking] Finding ${finding.id} BU changed: ${prev.buOwnership} → ${finding.buOwnership}`);
                    }
                } catch (err) {
                    console.error(`[BU Tracking] Error recording BU change for finding ${finding.id}:`, err.message);
                }
            }
        } catch (err) {
            console.error('[BU Tracking] BU comparison failed (non-fatal):', err.message);
        }

        // Upsert all open findings as individual rows
        await upsertFindingsBatch(allFindings, 'open');

        // Mark findings that disappeared from the open set:
        // Any finding that was 'open' in DB but NOT in the current sync set
        // should NOT be automatically closed here — archive detection handles that.
        // However, we track the current sync IDs for reference.
        const currentIds = allFindings.map(f => f.id);

        // Update sync metadata
        await pool.query(
            `UPDATE ivanti_sync_state SET total=$1, synced_at=NOW(), sync_status='success', error_message=NULL WHERE id=1`,
            [allFindings.length]
        );

        console.log(`[Ivanti Findings] Sync complete — ${allFindings.length} findings`);

        // Archive detection — compare previous vs current to detect disappeared/returned findings
        let archiveResult = { disappearedIds: [], returnedCount: 0, returnClassification: {} };
        try {
            archiveResult = await detectArchiveChanges(previousFindings, allFindings) || { disappearedIds: [], returnedCount: 0, returnClassification: {} };
        } catch (err) {
            console.error('[Ivanti Findings] Archive detection failed (non-fatal):', err.message);
        }

        // Read previous counts BEFORE syncClosedCount updates them — needed for anomaly deltas
        let previousOpenCount = 0;
        let previousClosedCount = 0;
        try {
            const { rows } = await pool.query(
                `SELECT open_count, closed_count FROM ivanti_counts_cache WHERE id = 1`
            );
            if (rows[0]) {
                previousOpenCount = rows[0].open_count || 0;
                previousClosedCount = rows[0].closed_count || 0;
            }
        } catch (err) {
            console.error('[Ivanti Findings] Failed to read previous counts for anomaly summary (non-fatal):', err.message);
        }

        await syncClosedCount(allFindings.length, apiKey, clientId, skipTls);
        await syncFPWorkflowCounts(allFindings, apiKey, clientId, skipTls);

        // Post-sync: BU drift checker for newly archived findings
        let classificationBreakdown = { bu_reassignment: 0, severity_drift: 0, closed_on_platform: 0, decommissioned: 0 };
        try {
            classificationBreakdown = await runBUDriftChecker(archiveResult.disappearedIds, apiKey, clientId, skipTls);
        } catch (err) {
            console.error('[Ivanti Findings] BU drift checker failed (non-fatal):', err.message);
        }

        // Post-sync: Compute and store anomaly summary
        try {
            const { rows } = await pool.query(
                `SELECT open_count, closed_count FROM ivanti_counts_cache WHERE id = 1`
            );
            const currentOpenCount = rows[0]?.open_count || 0;
            const currentClosedCount = rows[0]?.closed_count || 0;
            const openCountDelta = currentOpenCount - previousOpenCount;
            const closedCountDelta = currentClosedCount - previousClosedCount;

            await computeAnomalySummary(
                openCountDelta,
                closedCountDelta,
                archiveResult.disappearedIds.length,
                archiveResult.returnedCount,
                classificationBreakdown,
                archiveResult.returnClassification || {}
            );
        } catch (err) {
            console.error('[Ivanti Findings] Anomaly summary failed (non-fatal):', err.message);
        }
    } catch (err) {
        const msg = err.message || 'Unknown error';
        console.error('[Ivanti Findings] Sync failed:', msg);
        await pool.query(
            `UPDATE ivanti_sync_state SET sync_status='error', error_message=$1, synced_at=NOW() WHERE id=1`,
            [msg]
        );
    }
}

// ---------------------------------------------------------------------------
// Scheduler
// ---------------------------------------------------------------------------
async function scheduleSync() {
    try {
        const { rows } = await pool.query('SELECT synced_at FROM ivanti_sync_state WHERE id = 1');
        const row = rows[0];
        if (!row || !row.synced_at) {
            syncFindings();
        } else {
            const lastSync = new Date(row.synced_at);
            const hoursSince = (Date.now() - lastSync.getTime()) / (1000 * 60 * 60);
            if (hoursSince >= 24) {
                syncFindings();
            } else {
                console.log(`[Ivanti Findings] Last sync ${hoursSince.toFixed(1)}h ago — next auto-sync in ${(24 - hoursSince).toFixed(1)}h`);
            }
        }
    } catch (err) {
        console.error('[Ivanti Findings] Schedule sync check failed, triggering sync:', err.message);
        syncFindings();
    }

    setInterval(() => syncFindings(), SYNC_INTERVAL_MS);
}

// ---------------------------------------------------------------------------
// Router
// ---------------------------------------------------------------------------
function createIvantiFindingsRouter(db, requireAuth) {
    const router = express.Router();

    // Initialize sync schedule (no table init needed — schema handled by db-schema.sql)
    scheduleSync();

    router.use(requireAuth());

    /**
     * GET /api/ivanti/findings
     *
     * Return findings from ivanti_findings table (state='open') with notes and overrides.
     * Accepts optional `teams` query parameter (comma-separated) to filter
     * findings by buOwnership. If omitted, returns all open findings.
     *
     * @query {string} [teams] - Comma-separated team names (e.g. 'STEAM,ACCESS-ENG')
     * @returns {Object} 200 - { findings, total, synced_at, sync_status, error_message }
     * @returns {Object} 500 - { error: string } on database error
     */
    router.get('/', async (req, res) => {
        try {
            const teamsParam = req.query.teams;
            let query = `SELECT * FROM ivanti_findings WHERE state = 'open'`;
            const params = [];
            let paramIndex = 1;

            if (teamsParam) {
                const teams = teamsParam.split(',').map(t => t.trim()).filter(Boolean);
                if (teams.length > 0) {
                    const patterns = teams.map(t => `%${t}%`);
                    query += ` AND bu_ownership ILIKE ANY($${paramIndex++}::text[])`;
                    params.push(patterns);
                }
            }

            query += ' ORDER BY severity DESC';

            const { rows } = await pool.query(query, params);

            // Transform rows to match existing API response shape
            const findings = rows.map(row => ({
                id: row.id,
                hostId: row.host_id,
                title: row.title,
                severity: parseFloat(row.severity),
                vrrGroup: row.vrr_group,
                hostName: row.host_name,
                ipAddress: row.ip_address,
                dns: row.dns,
                status: row.status,
                slaStatus: row.sla_status,
                dueDate: formatDate(row.due_date),
                lastFoundOn: formatDate(row.last_found_on),
                buOwnership: row.bu_ownership,
                cves: row.cves || [],
                workflow: row.workflow_id ? { id: row.workflow_id, state: row.workflow_state, type: row.workflow_type } : null,
                note: row.note || '',
                overrides: {
                    ...(row.override_host_name ? { hostName: row.override_host_name } : {}),
                    ...(row.override_dns ? { dns: row.override_dns } : {})
                }
            }));

            // Get sync metadata
            const metaResult = await pool.query('SELECT synced_at, sync_status, error_message FROM ivanti_sync_state WHERE id = 1');
            const meta = metaResult.rows[0] || {};

            res.json({
                findings,
                total: findings.length,
                synced_at: meta.synced_at || null,
                sync_status: meta.sync_status || 'never',
                error_message: meta.error_message || null
            });
        } catch (err) {
            console.error('[Ivanti Findings] GET / error:', err.message);
            res.status(500).json({ error: 'Database error reading findings' });
        }
    });

    /**
     * POST /api/ivanti/findings/sync
     *
     * Trigger an immediate Ivanti findings sync and return the fresh state.
     * Requires Admin or Standard_User group.
     *
     * @returns {Object} 200 - { findings, total, synced_at, sync_status, error_message }
     * @returns {Object} 500 - { error: string } if sync ran but state could not be read
     */
    router.post('/sync', requireGroup('Admin', 'Standard_User'), async (req, res) => {
        await syncFindings();
        try {
            // Return fresh state after sync
            const { rows } = await pool.query(
                `SELECT * FROM ivanti_findings WHERE state = 'open' ORDER BY severity DESC`
            );
            const findings = rows.map(row => ({
                id: row.id,
                hostId: row.host_id,
                title: row.title,
                severity: parseFloat(row.severity),
                vrrGroup: row.vrr_group,
                hostName: row.host_name,
                ipAddress: row.ip_address,
                dns: row.dns,
                status: row.status,
                slaStatus: row.sla_status,
                dueDate: formatDate(row.due_date),
                lastFoundOn: formatDate(row.last_found_on),
                buOwnership: row.bu_ownership,
                cves: row.cves || [],
                workflow: row.workflow_id ? { id: row.workflow_id, state: row.workflow_state, type: row.workflow_type } : null,
                note: row.note || '',
                overrides: {
                    ...(row.override_host_name ? { hostName: row.override_host_name } : {}),
                    ...(row.override_dns ? { dns: row.override_dns } : {})
                }
            }));

            const metaResult = await pool.query('SELECT synced_at, sync_status, error_message FROM ivanti_sync_state WHERE id = 1');
            const meta = metaResult.rows[0] || {};

            res.json({
                findings,
                total: findings.length,
                synced_at: meta.synced_at || null,
                sync_status: meta.sync_status || 'never',
                error_message: meta.error_message || null
            });
        } catch (err) {
            console.error('[Ivanti Findings] POST /sync read error:', err.message);
            res.status(500).json({ error: 'Sync ran but could not read updated state' });
        }
    });

    /**
     * GET /api/ivanti/findings/counts
     *
     * Return open vs closed finding totals.
     * Accepts optional `teams` query parameter to scope counts to specific BUs.
     * With Postgres, both open AND closed counts are per-BU when filtered.
     *
     * @query {string} [teams] - Comma-separated team names (e.g. 'STEAM,ACCESS-ENG')
     * @returns {Object} 200 - { open: number, closed: number, filtered: boolean }
     * @returns {Object} 500 - { error: string } on database error
     */
    router.get('/counts', async (req, res) => {
        try {
            const teamsParam = req.query.teams;
            let whereExtra = '';
            const params = [];
            let paramIndex = 1;

            if (teamsParam) {
                const teams = teamsParam.split(',').map(t => t.trim()).filter(Boolean);
                if (teams.length > 0) {
                    const patterns = teams.map(t => `%${t}%`);
                    whereExtra = ` AND bu_ownership ILIKE ANY($${paramIndex++}::text[])`;
                    params.push(patterns);
                }
            }

            const { rows } = await pool.query(
                `SELECT state, COUNT(*) as count FROM ivanti_findings WHERE 1=1 ${whereExtra} GROUP BY state`,
                params
            );

            const counts = { open: 0, closed: 0 };
            rows.forEach(r => { counts[r.state] = parseInt(r.count); });

            res.json({ ...counts, filtered: !!teamsParam });
        } catch (err) {
            console.error('[Ivanti Findings] GET /counts error:', err.message);
            res.status(500).json({ error: 'Database error reading counts' });
        }
    });

    /**
     * GET /api/ivanti/findings/counts/history
     *
     * Return the last snapshot per day (ascending) for the trend chart.
     * Accepts optional `teams` query parameter to scope the trend to specific BUs.
     * When teams is provided, uses the per-BU history table.
     * When no teams, returns the global aggregate history.
     *
     * @query {string} [teams] - Comma-separated team names (e.g. 'STEAM,ACCESS-ENG')
     * @returns {Object} 200 - { history: Array<{ date: string, open_count: number, closed_count: number }> }
     * @returns {Object} 500 - { error: string } on database error
     */
    router.get('/counts/history', async (req, res) => {
        try {
            const teamsParam = req.query.teams;

            if (teamsParam) {
                // Per-BU history — filter and aggregate by selected teams
                const teams = teamsParam.split(',').map(t => t.trim()).filter(Boolean);
                if (teams.length > 0) {
                    const patterns = teams.map(t => `%${t}%`);
                    const { rows } = await pool.query(
                        `SELECT date,
                                SUM(CASE WHEN state = 'open' THEN count ELSE 0 END)::int AS open_count,
                                SUM(CASE WHEN state = 'closed' THEN count ELSE 0 END)::int AS closed_count
                         FROM (
                             SELECT recorded_at::date AS date, bu_ownership, state, count,
                                    ROW_NUMBER() OVER (
                                        PARTITION BY recorded_at::date, bu_ownership, state
                                        ORDER BY recorded_at DESC
                                    ) AS rn
                             FROM ivanti_counts_history_by_bu
                             WHERE bu_ownership ILIKE ANY($1::text[])
                         ) sub WHERE rn = 1
                         GROUP BY date
                         ORDER BY date ASC`,
                        [patterns]
                    );
                    return res.json({ history: rows });
                }
            }

            // Global history (no filter)
            const { rows } = await pool.query(
                `SELECT date, open_count, closed_count FROM (
                     SELECT recorded_at::date AS date,
                            open_count, closed_count,
                            ROW_NUMBER() OVER (
                                PARTITION BY recorded_at::date
                                ORDER BY recorded_at DESC
                            ) AS rn
                     FROM ivanti_counts_history
                 ) sub WHERE rn = 1
                 ORDER BY date ASC`
            );
            res.json({ history: rows });
        } catch (err) {
            console.error('[Ivanti Findings] GET /counts/history error:', err.message);
            res.status(500).json({ error: 'Database error' });
        }
    });

    /**
     * GET /api/ivanti/findings/fp-workflow-counts
     *
     * Return FP finding counts and unique workflow ID counts (open + closed),
     * broken down by workflow status.
     * Accepts optional `teams` query parameter to scope to specific BUs.
     *
     * @query {string} [teams] - Comma-separated team names (e.g. 'STEAM,ACCESS-ENG')
     * @returns {Object} 200 - { findingCounts: Object, findingTotal: number, idCounts: Object, idTotal: number }
     * @returns {Object} 500 - { error: string } on database error
     */
    router.get('/fp-workflow-counts', async (req, res) => {
        try {
            const teamsParam = req.query.teams;
            let whereExtra = '';
            const params = [];
            let paramIndex = 1;

            if (teamsParam) {
                const teams = teamsParam.split(',').map(t => t.trim()).filter(Boolean);
                if (teams.length > 0) {
                    const patterns = teams.map(t => `%${t}%`);
                    whereExtra = ` AND bu_ownership ILIKE ANY($${paramIndex++}::text[])`;
                    params.push(patterns);
                }
            }

            // Finding counts: number of findings per workflow state
            const findingResult = await pool.query(
                `SELECT workflow_state, COUNT(*) as count
                 FROM ivanti_findings
                 WHERE workflow_id IS NOT NULL ${whereExtra}
                 GROUP BY workflow_state`,
                params
            );
            const findingCounts = {};
            findingResult.rows.forEach(r => {
                const state = r.workflow_state || 'Unknown';
                findingCounts[state] = parseInt(r.count);
            });

            // ID counts: number of unique workflow IDs per state
            const idResult = await pool.query(
                `SELECT workflow_state, COUNT(DISTINCT workflow_id) as count
                 FROM ivanti_findings
                 WHERE workflow_id IS NOT NULL ${whereExtra}
                 GROUP BY workflow_state`,
                params
            );
            const idCounts = {};
            idResult.rows.forEach(r => {
                const state = r.workflow_state || 'Unknown';
                idCounts[state] = parseInt(r.count);
            });

            res.json({
                findingCounts,
                findingTotal: Object.values(findingCounts).reduce((a, b) => a + b, 0),
                idCounts,
                idTotal: Object.values(idCounts).reduce((a, b) => a + b, 0),
            });
        } catch (err) {
            console.error('[Ivanti Findings] GET /fp-workflow-counts error:', err.message);
            res.status(500).json({ error: 'Database error reading FP workflow counts' });
        }
    });

    /**
     * GET /api/ivanti/findings/anomaly/latest
     *
     * Return the most recent anomaly summary row from ivanti_sync_anomaly_log.
     *
     * @returns {Object} 200 - { anomaly: Object|null }
     * @returns {Object} 500 - { error: string } on database error
     */
    router.get('/anomaly/latest', async (req, res) => {
        try {
            const { rows } = await pool.query(
                `SELECT id, sync_timestamp, open_count_delta, closed_count_delta,
                        newly_archived_count, returned_count, classification_json, return_classification_json, is_significant
                 FROM ivanti_sync_anomaly_log
                 ORDER BY sync_timestamp DESC LIMIT 1`
            );
            const row = rows[0];
            if (!row) return res.json({ anomaly: null });
            let classification = {};
            try { classification = JSON.parse(row.classification_json || '{}'); } catch (_) {}
            let return_classification = {};
            try { return_classification = JSON.parse(row.return_classification_json || '{}'); } catch (_) {}
            res.json({
                anomaly: {
                    id: row.id,
                    sync_timestamp: row.sync_timestamp,
                    open_count_delta: row.open_count_delta,
                    closed_count_delta: row.closed_count_delta,
                    newly_archived_count: row.newly_archived_count,
                    returned_count: row.returned_count,
                    classification,
                    return_classification,
                    is_significant: !!row.is_significant
                }
            });
        } catch (err) {
            console.error('[Ivanti Findings] GET /anomaly/latest error:', err.message);
            res.status(500).json({ error: 'Database error reading latest anomaly' });
        }
    });

    /**
     * GET /api/ivanti/findings/anomaly/history
     *
     * Return anomaly history. Accepts optional `from` and `to` query parameters.
     *
     * @query {string} [from] - Inclusive start date (ISO string)
     * @query {string} [to]   - Inclusive end date (ISO string)
     *
     * @returns {Object} 200 - { history: Array<Object> }
     * @returns {Object} 500 - { error: string } on database error
     */
    router.get('/anomaly/history', async (req, res) => {
        try {
            const { from, to } = req.query;
            let rows;

            if (from && to) {
                const result = await pool.query(
                    `SELECT sync_timestamp, open_count_delta, closed_count_delta,
                            newly_archived_count, returned_count, classification_json, return_classification_json, is_significant
                     FROM ivanti_sync_anomaly_log
                     WHERE sync_timestamp >= $1 AND sync_timestamp <= $2
                     ORDER BY sync_timestamp DESC`,
                    [from, to]
                );
                rows = result.rows;
            } else {
                const result = await pool.query(
                    `SELECT sync_timestamp, open_count_delta, closed_count_delta,
                            newly_archived_count, returned_count, classification_json, return_classification_json, is_significant
                     FROM ivanti_sync_anomaly_log
                     ORDER BY sync_timestamp DESC LIMIT 30`
                );
                rows = result.rows;
            }

            const history = rows.map(row => {
                let classification = {};
                try { classification = JSON.parse(row.classification_json || '{}'); } catch (_) {}
                let return_classification = {};
                try { return_classification = JSON.parse(row.return_classification_json || '{}'); } catch (_) {}
                return {
                    sync_timestamp: row.sync_timestamp,
                    open_count_delta: row.open_count_delta,
                    closed_count_delta: row.closed_count_delta,
                    newly_archived_count: row.newly_archived_count,
                    returned_count: row.returned_count,
                    classification,
                    return_classification,
                    is_significant: !!row.is_significant
                };
            });

            res.json({ history });
        } catch (err) {
            console.error('[Ivanti Findings] GET /anomaly/history error:', err.message);
            res.status(500).json({ error: 'Database error reading anomaly history' });
        }
    });

    /**
     * GET /api/ivanti/findings/bu-changes
     *
     * Return all BU change events from ivanti_finding_bu_history.
     *
     * @returns {Object} 200 - { changes: Array<Object> }
     * @returns {Object} 500 - { error: string } on database error
     */
    router.get('/bu-changes', async (req, res) => {
        try {
            const { rows } = await pool.query(
                `SELECT id, finding_id, finding_title, host_name, previous_bu, new_bu, detected_at
                 FROM ivanti_finding_bu_history
                 ORDER BY detected_at DESC`
            );
            res.json({ changes: rows });
        } catch (err) {
            console.error('[Ivanti Findings] GET /bu-changes error:', err.message);
            res.status(500).json({ error: 'Database error reading BU changes' });
        }
    });

    /**
     * GET /api/ivanti/findings/:findingId/bu-history
     *
     * Return BU change history for a specific finding.
     *
     * @param {string} findingId - The finding identifier (URL param)
     * @returns {Object} 200 - { finding_id: string, history: Array<Object> }
     * @returns {Object} 500 - { error: string } on database error
     */
    router.get('/:findingId/bu-history', async (req, res) => {
        try {
            const { findingId } = req.params;
            const { rows } = await pool.query(
                `SELECT previous_bu, new_bu, detected_at
                 FROM ivanti_finding_bu_history
                 WHERE finding_id = $1
                 ORDER BY detected_at DESC`,
                [findingId]
            );
            res.json({ finding_id: findingId, history: rows });
        } catch (err) {
            console.error('[Ivanti Findings] GET /:findingId/bu-history error:', err.message);
            res.status(500).json({ error: 'Database error reading finding BU history' });
        }
    });

    /**
     * PUT /api/ivanti/findings/:findingId/override
     *
     * Save or clear field overrides for a finding. Requires Admin or Standard_User group.
     * Accepts hostName and/or dns in the body. Empty/null values clear the override.
     *
     * @param {string} findingId - The finding identifier (URL param)
     * @body {string} [hostName] - Override for host name; empty/null to clear
     * @body {string} [dns]      - Override for DNS; empty/null to clear
     *
     * @returns {Object} 200 - { finding_id, overrides: { hostName, dns } }
     * @returns {Object} 404 - { error: string } when finding not found
     * @returns {Object} 500 - { error: string } on database error
     */
    router.put('/:findingId/override', requireGroup('Admin', 'Standard_User'), async (req, res) => {
        try {
            const { findingId } = req.params;
            const { hostName, dns, field, value } = req.body;

            // Support legacy single-field format: { field: 'hostName', value: 'x' }
            if (field !== undefined) {
                const OVERRIDE_ALLOWED = ['hostName', 'dns'];
                if (!OVERRIDE_ALLOWED.includes(field)) {
                    return res.status(400).json({ error: `Field '${field}' is not editable. Allowed: ${OVERRIDE_ALLOWED.join(', ')}` });
                }
                const val = String(value ?? '').trim() || null;
                const col = field === 'hostName' ? 'override_host_name' : 'override_dns';
                await pool.query(
                    `UPDATE ivanti_findings SET ${col} = $1 WHERE id = $2`,
                    [val, findingId]
                );
                return res.json({ finding_id: findingId, field, value: val });
            }

            // New multi-field format: { hostName: 'x', dns: 'y' }
            const overrideHostName = hostName !== undefined ? (String(hostName).trim() || null) : undefined;
            const overrideDns = dns !== undefined ? (String(dns).trim() || null) : undefined;

            if (overrideHostName !== undefined || overrideDns !== undefined) {
                const sets = [];
                const params = [];
                let idx = 1;

                if (overrideHostName !== undefined) {
                    sets.push(`override_host_name = $${idx++}`);
                    params.push(overrideHostName);
                }
                if (overrideDns !== undefined) {
                    sets.push(`override_dns = $${idx++}`);
                    params.push(overrideDns);
                }

                params.push(findingId);
                await pool.query(
                    `UPDATE ivanti_findings SET ${sets.join(', ')} WHERE id = $${idx}`,
                    params
                );
            }

            // Return current override state
            const { rows } = await pool.query(
                `SELECT override_host_name, override_dns FROM ivanti_findings WHERE id = $1`,
                [findingId]
            );
            if (rows.length === 0) {
                return res.status(404).json({ error: 'Finding not found' });
            }

            res.json({
                finding_id: findingId,
                overrides: {
                    ...(rows[0].override_host_name ? { hostName: rows[0].override_host_name } : {}),
                    ...(rows[0].override_dns ? { dns: rows[0].override_dns } : {})
                }
            });
        } catch (err) {
            console.error('[Ivanti Findings] PUT /:findingId/override error:', err.message);
            res.status(500).json({ error: 'Failed to save override' });
        }
    });

    /**
     * PUT /api/ivanti/findings/:findingId/note
     *
     * Save or update a note for a finding (max 255 characters).
     * Requires Admin or Standard_User group.
     *
     * @param {string} findingId - The finding identifier (URL param)
     * @body {string} [note]     - The note text (truncated to 255 chars)
     *
     * @returns {Object} 200 - { finding_id: string, note: string }
     * @returns {Object} 500 - { error: string } on database error
     */
    router.put('/:findingId/note', requireGroup('Admin', 'Standard_User'), async (req, res) => {
        try {
            const { findingId } = req.params;
            const note = String(req.body.note || '').slice(0, 255);

            await pool.query(
                'UPDATE ivanti_findings SET note = $1 WHERE id = $2',
                [note, findingId]
            );

            res.json({ finding_id: findingId, note });
        } catch (err) {
            console.error('[Ivanti Findings] PUT /:findingId/note error:', err.message);
            res.status(500).json({ error: 'Failed to save note' });
        }
    });

    return router;
}

module.exports = createIvantiFindingsRouter;
module.exports.detectArchiveChanges = detectArchiveChanges;
module.exports.detectClosedFindings = detectClosedFindings;
module.exports.runBUDriftChecker = runBUDriftChecker;
module.exports.computeAnomalySummary = computeAnomalySummary;
module.exports.extractFinding = extractFinding;
module.exports.upsertFindingsBatch = upsertFindingsBatch;
