// ArcherTemplatePage.js
// Full-page Template Manager — browse, create, edit, clone, and delete
// Archer Risk Acceptance templates organized by Vendor > Platform > Model.
// Write operations require editor/admin role (Standard_User or Admin group).

import React, { useState, useEffect, useCallback } from 'react';
import {
  FileText, Plus, Edit, Copy, Trash2, ChevronDown, ChevronRight,
  Loader, AlertCircle, RefreshCw, Eye, EyeOff, Clipboard, Check,
} from 'lucide-react';
import { useAuth } from '../../contexts/AuthContext';
import TemplateFormModal from '../TemplateFormModal';
import DeleteConfirmModal from '../DeleteConfirmModal';

const API_BASE = process.env.REACT_APP_API_BASE || 'http://localhost:3001/api';

// Section field mapping — ordered: static first, then semi-static
const SECTIONS = [
  { key: 'environment_overview', label: 'Environment Overview' },
  { key: 'segmentation', label: 'Segmentation' },
  { key: 'mitigating_controls', label: 'Mitigating Controls' },
  { key: 'additional_info', label: 'Additional Info/Background' },
  { key: 'charter_network_banner', label: 'Charter Network Banner' },
  { key: 'data_classification', label: 'Data Classification' },
  { key: 'charter_network', label: 'Charter Network' },
  { key: 'additional_access_list', label: 'Additional Access List' },
];

// ---------------------------------------------------------------------------
// Styles — dark theme tactical intelligence aesthetic
// ---------------------------------------------------------------------------
const STYLES = {
  page: {
    minHeight: '60vh',
  },
  card: {
    background: 'linear-gradient(135deg, rgba(30, 41, 59, 0.95), rgba(15, 23, 42, 0.98))',
    border: '1px solid rgba(0, 212, 255, 0.15)',
    borderRadius: '12px',
    padding: '1.5rem',
    marginBottom: '1rem',
  },
  header: {
    fontFamily: 'monospace',
    fontSize: '0.7rem',
    fontWeight: 700,
    color: '#00d4ff',
    textTransform: 'uppercase',
    letterSpacing: '0.15em',
    marginBottom: '1rem',
  },
  toolbar: {
    display: 'flex',
    alignItems: 'center',
    justifyContent: 'space-between',
    marginBottom: '1rem',
    flexWrap: 'wrap',
    gap: '0.5rem',
  },
  btn: {
    padding: '0.5rem 1rem',
    borderRadius: '8px',
    border: '1px solid rgba(0, 212, 255, 0.3)',
    background: 'rgba(0, 212, 255, 0.1)',
    color: '#7DD3FC',
    cursor: 'pointer',
    fontSize: '0.8rem',
    fontWeight: 600,
    display: 'inline-flex',
    alignItems: 'center',
    gap: '0.4rem',
    transition: 'all 0.2s',
  },
  btnDanger: {
    padding: '0.4rem 0.75rem',
    borderRadius: '6px',
    border: '1px solid rgba(239, 68, 68, 0.3)',
    background: 'rgba(239, 68, 68, 0.1)',
    color: '#FCA5A5',
    cursor: 'pointer',
    fontSize: '0.75rem',
    fontWeight: 600,
    display: 'inline-flex',
    alignItems: 'center',
    gap: '0.3rem',
    transition: 'all 0.2s',
  },
  btnSmall: {
    padding: '0.35rem 0.65rem',
    borderRadius: '6px',
    border: '1px solid rgba(0, 212, 255, 0.25)',
    background: 'rgba(0, 212, 255, 0.08)',
    color: '#7DD3FC',
    cursor: 'pointer',
    fontSize: '0.75rem',
    fontWeight: 600,
    display: 'inline-flex',
    alignItems: 'center',
    gap: '0.3rem',
    transition: 'all 0.2s',
  },
  vendorGroup: {
    marginBottom: '0.75rem',
  },
  vendorHeader: {
    display: 'flex',
    alignItems: 'center',
    gap: '0.5rem',
    padding: '0.6rem 0.75rem',
    background: 'rgba(0, 212, 255, 0.05)',
    border: '1px solid rgba(0, 212, 255, 0.12)',
    borderRadius: '8px',
    cursor: 'pointer',
    transition: 'all 0.15s',
  },
  vendorLabel: {
    fontSize: '0.85rem',
    fontWeight: 700,
    color: '#e0e0e0',
  },
  vendorCount: {
    fontSize: '0.7rem',
    color: '#64748B',
    marginLeft: 'auto',
  },
  platformSubgroup: {
    marginLeft: '1.25rem',
    marginTop: '0.5rem',
    paddingLeft: '0.75rem',
    borderLeft: '2px solid rgba(0, 212, 255, 0.1)',
  },
  platformLabel: {
    fontSize: '0.78rem',
    fontWeight: 600,
    color: '#94A3B8',
    marginBottom: '0.35rem',
    textTransform: 'uppercase',
    letterSpacing: '0.05em',
  },
  templateRow: {
    display: 'flex',
    alignItems: 'center',
    justifyContent: 'space-between',
    padding: '0.45rem 0.6rem',
    borderRadius: '6px',
    marginBottom: '0.25rem',
    transition: 'background 0.15s',
  },
  templateModel: {
    fontSize: '0.82rem',
    color: '#e0e0e0',
    fontWeight: 500,
  },
  templateActions: {
    display: 'flex',
    alignItems: 'center',
    gap: '0.35rem',
  },
  emptyState: {
    textAlign: 'center',
    padding: '3rem 1rem',
    color: '#64748B',
    fontSize: '0.9rem',
  },
  errorBanner: {
    padding: '0.75rem 1rem',
    borderRadius: '8px',
    background: 'rgba(239, 68, 68, 0.1)',
    border: '1px solid rgba(239, 68, 68, 0.25)',
    color: '#FCA5A5',
    fontSize: '0.82rem',
    display: 'flex',
    alignItems: 'center',
    gap: '0.5rem',
    marginBottom: '1rem',
  },
  loadingState: {
    textAlign: 'center',
    padding: '3rem 1rem',
    color: '#64748B',
    fontSize: '0.85rem',
    display: 'flex',
    flexDirection: 'column',
    alignItems: 'center',
    gap: '0.75rem',
  },
};

// ---------------------------------------------------------------------------
// Helpers
// ---------------------------------------------------------------------------

/**
 * Group templates by vendor, then by platform within each vendor.
 * Returns: [ { vendor, platforms: [ { platform, templates: [...] } ] } ]
 */
function groupTemplates(templates) {
  const vendorMap = {};
  for (const t of templates) {
    if (!vendorMap[t.vendor]) vendorMap[t.vendor] = {};
    if (!vendorMap[t.vendor][t.platform]) vendorMap[t.vendor][t.platform] = [];
    vendorMap[t.vendor][t.platform].push(t);
  }

  const vendors = Object.keys(vendorMap).sort((a, b) =>
    a.localeCompare(b, undefined, { sensitivity: 'base' })
  );

  return vendors.map(vendor => {
    const platforms = Object.keys(vendorMap[vendor]).sort((a, b) =>
      a.localeCompare(b, undefined, { sensitivity: 'base' })
    );
    return {
      vendor,
      platforms: platforms.map(platform => ({
        platform,
        templates: vendorMap[vendor][platform].sort((a, b) =>
          a.model.localeCompare(b.model, undefined, { sensitivity: 'base' })
        ),
      })),
    };
  });
}

// ---------------------------------------------------------------------------
// ArcherTemplatePage
// ---------------------------------------------------------------------------
export default function ArcherTemplatePage() {
  const { canWrite } = useAuth();
  const [templates, setTemplates] = useState([]);
  const [loading, setLoading] = useState(true);
  const [error, setError] = useState(null);
  const [expandedVendors, setExpandedVendors] = useState({});

  // Modal state for create/edit/clone
  const [modalState, setModalState] = useState({ open: false, mode: 'create', template: null });
  const [deleteTarget, setDeleteTarget] = useState(null);
  // View panel state — which template ID is expanded for viewing
  const [viewExpandedId, setViewExpandedId] = useState(null);
  // Copy state for view panel
  const [copiedSections, setCopiedSections] = useState({});
  const [copyAllCopied, setCopyAllCopied] = useState(false);

  // -------------------------------------------------------------------------
  // Fetch templates
  // -------------------------------------------------------------------------
  const fetchTemplates = useCallback(async () => {
    setLoading(true);
    setError(null);
    try {
      const res = await fetch(`${API_BASE}/archer-templates`, {
        credentials: 'include',
      });
      if (!res.ok) {
        const data = await res.json().catch(() => ({}));
        throw new Error(data.error || `Failed to fetch templates (${res.status})`);
      }
      const data = await res.json();
      setTemplates(data);
      // Expand all vendors by default on initial load
      const expanded = {};
      const grouped = groupTemplates(data);
      for (const g of grouped) {
        expanded[g.vendor] = true;
      }
      setExpandedVendors(expanded);
    } catch (err) {
      setError(err.message);
    } finally {
      setLoading(false);
    }
  }, []);

  useEffect(() => {
    fetchTemplates();
  }, [fetchTemplates]);

  // -------------------------------------------------------------------------
  // Vendor toggle
  // -------------------------------------------------------------------------
  const toggleVendor = (vendor) => {
    setExpandedVendors(prev => ({ ...prev, [vendor]: !prev[vendor] }));
  };

  // -------------------------------------------------------------------------
  // View panel toggle and copy handlers
  // -------------------------------------------------------------------------
  const toggleView = (templateId) => {
    setViewExpandedId(prev => prev === templateId ? null : templateId);
    setCopiedSections({});
    setCopyAllCopied(false);
  };

  const handleCopySection = async (sectionKey, content) => {
    if (!content) return;
    try {
      await navigator.clipboard.writeText(content);
      setCopiedSections(prev => ({ ...prev, [sectionKey]: true }));
      setTimeout(() => {
        setCopiedSections(prev => ({ ...prev, [sectionKey]: false }));
      }, 2000);
    } catch (_err) { /* clipboard failed */ }
  };

  const handleCopyAll = async (template) => {
    const parts = [];
    for (const section of SECTIONS) {
      const content = template[section.key];
      if (content && content.trim()) {
        parts.push(`${section.label}\n${content}`);
      }
    }
    try {
      await navigator.clipboard.writeText(parts.join('\n\n'));
      setCopyAllCopied(true);
      setTimeout(() => setCopyAllCopied(false), 2000);
    } catch (_err) { /* clipboard failed */ }
  };

  // -------------------------------------------------------------------------
  // Grouped data
  // -------------------------------------------------------------------------
  const grouped = groupTemplates(templates);
  const totalCount = templates.length;

  // -------------------------------------------------------------------------
  // Render
  // -------------------------------------------------------------------------
  return (
    <div style={STYLES.page}>
      <div style={STYLES.card}>
        {/* Header */}
        <div style={STYLES.header}>
          <FileText size={12} style={{ display: 'inline', verticalAlign: 'middle', marginRight: '0.4rem' }} />
          Archer Template Library
        </div>

        {/* Toolbar */}
        <div style={STYLES.toolbar}>
          <div style={{ display: 'flex', alignItems: 'center', gap: '0.5rem' }}>
            <span style={{ color: '#94A3B8', fontSize: '0.8rem' }}>
              {totalCount} template{totalCount !== 1 ? 's' : ''}
            </span>
            <button
              style={STYLES.btn}
              onClick={fetchTemplates}
              title="Refresh"
            >
              <RefreshCw size={13} />
            </button>
          </div>

          {canWrite() && (
            <button
              style={STYLES.btn}
              onClick={() => setModalState({ open: true, mode: 'create', template: null })}
            >
              <Plus size={14} />
              Create Template
            </button>
          )}
        </div>

        {/* Error banner */}
        {error && (
          <div style={STYLES.errorBanner}>
            <AlertCircle size={14} />
            {error}
          </div>
        )}

        {/* Loading state */}
        {loading && (
          <div style={STYLES.loadingState}>
            <Loader size={24} style={{ animation: 'spin 1s linear infinite' }} />
            <span>Loading templates...</span>
          </div>
        )}

        {/* Empty state */}
        {!loading && !error && templates.length === 0 && (
          <div style={STYLES.emptyState}>
            <FileText size={32} style={{ marginBottom: '0.75rem', opacity: 0.4 }} />
            <div>No templates found</div>
            {canWrite() && (
              <div style={{ marginTop: '0.5rem', fontSize: '0.8rem', color: '#475569' }}>
                Click "Create Template" to add your first template.
              </div>
            )}
          </div>
        )}

        {/* Template list grouped by vendor > platform */}
        {!loading && grouped.map(({ vendor, platforms }) => (
          <div key={vendor} style={STYLES.vendorGroup}>
            {/* Vendor header — collapsible */}
            <div
              style={STYLES.vendorHeader}
              onClick={() => toggleVendor(vendor)}
              onMouseEnter={e => { e.currentTarget.style.background = 'rgba(0, 212, 255, 0.1)'; }}
              onMouseLeave={e => { e.currentTarget.style.background = 'rgba(0, 212, 255, 0.05)'; }}
            >
              {expandedVendors[vendor]
                ? <ChevronDown size={14} style={{ color: '#00d4ff' }} />
                : <ChevronRight size={14} style={{ color: '#64748B' }} />
              }
              <span style={STYLES.vendorLabel}>{vendor}</span>
              <span style={STYLES.vendorCount}>
                {platforms.reduce((sum, p) => sum + p.templates.length, 0)} template{platforms.reduce((sum, p) => sum + p.templates.length, 0) !== 1 ? 's' : ''}
              </span>
            </div>

            {/* Platform subgroups */}
            {expandedVendors[vendor] && platforms.map(({ platform, templates: platTemplates }) => (
              <div key={platform} style={STYLES.platformSubgroup}>
                <div style={STYLES.platformLabel}>{platform}</div>
                {platTemplates.map(template => (
                  <div key={template.id}>
                    <div
                      style={STYLES.templateRow}
                      onMouseEnter={e => { e.currentTarget.style.background = 'rgba(0, 212, 255, 0.04)'; }}
                      onMouseLeave={e => { e.currentTarget.style.background = 'transparent'; }}
                    >
                      <span
                        style={{ ...STYLES.templateModel, cursor: 'pointer', display: 'flex', alignItems: 'center', gap: '0.4rem' }}
                        onClick={() => toggleView(template.id)}
                        title="View template sections"
                      >
                        {viewExpandedId === template.id
                          ? <EyeOff size={13} style={{ color: '#00d4ff' }} />
                          : <Eye size={13} style={{ color: '#64748B' }} />
                        }
                        {template.model}
                      </span>
                      {canWrite() && (
                        <div style={STYLES.templateActions}>
                          <button
                            style={STYLES.btnSmall}
                            onClick={() => setModalState({ open: true, mode: 'edit', template })}
                            title="Edit template"
                          >
                            <Edit size={12} />
                          </button>
                          <button
                            style={STYLES.btnSmall}
                            onClick={() => setModalState({ open: true, mode: 'clone', template })}
                            title="Clone template"
                          >
                            <Copy size={12} />
                          </button>
                          <button
                            style={STYLES.btnDanger}
                            onClick={() => setDeleteTarget(template)}
                            title="Delete template"
                          >
                            <Trash2 size={12} />
                          </button>
                        </div>
                      )}
                    </div>
                    {/* Expandable view panel */}
                    {viewExpandedId === template.id && (
                      <div style={{
                        margin: '0.25rem 0 0.75rem 1.5rem',
                        padding: '0.75rem 1rem',
                        background: 'rgba(15, 23, 42, 0.6)',
                        border: '1px solid rgba(0, 212, 255, 0.12)',
                        borderRadius: '8px',
                      }}>
                        {/* Copy All button */}
                        <div style={{ display: 'flex', justifyContent: 'flex-end', marginBottom: '0.5rem' }}>
                          <button
                            onClick={() => handleCopyAll(template)}
                            style={{
                              padding: '0.3rem 0.6rem',
                              borderRadius: '5px',
                              border: copyAllCopied ? '1px solid rgba(34, 197, 94, 0.4)' : '1px solid rgba(0, 212, 255, 0.3)',
                              background: copyAllCopied ? 'rgba(34, 197, 94, 0.12)' : 'rgba(0, 212, 255, 0.08)',
                              color: copyAllCopied ? '#22c55e' : '#00d4ff',
                              fontSize: '0.7rem',
                              fontWeight: 600,
                              cursor: 'pointer',
                              display: 'flex',
                              alignItems: 'center',
                              gap: '0.3rem',
                            }}
                          >
                            {copyAllCopied ? <><Check size={11} /> Copied!</> : <><Clipboard size={11} /> Copy All</>}
                          </button>
                        </div>
                        {/* Section blocks */}
                        {SECTIONS.map(section => {
                          const content = template[section.key];
                          const isEmpty = !content || !content.trim();
                          const isCopied = copiedSections[section.key];
                          return (
                            <div key={section.key} style={{
                              marginBottom: '0.5rem',
                              padding: '0.5rem 0.6rem',
                              background: 'rgba(30, 41, 59, 0.5)',
                              border: '1px solid rgba(100, 116, 139, 0.12)',
                              borderRadius: '6px',
                            }}>
                              <div style={{ display: 'flex', alignItems: 'center', justifyContent: 'space-between', marginBottom: '0.25rem' }}>
                                <span style={{ fontSize: '0.72rem', fontWeight: 600, color: '#94a3b8', textTransform: 'uppercase', letterSpacing: '0.04em' }}>
                                  {section.label}
                                </span>
                                <button
                                  onClick={() => handleCopySection(section.key, content)}
                                  disabled={isEmpty}
                                  style={{
                                    padding: '0.2rem 0.4rem',
                                    borderRadius: '4px',
                                    border: isCopied ? '1px solid rgba(34, 197, 94, 0.3)' : '1px solid rgba(100, 116, 139, 0.25)',
                                    background: isCopied ? 'rgba(34, 197, 94, 0.1)' : 'rgba(100, 116, 139, 0.1)',
                                    color: isCopied ? '#22c55e' : '#94a3b8',
                                    fontSize: '0.65rem',
                                    cursor: isEmpty ? 'not-allowed' : 'pointer',
                                    opacity: isEmpty ? 0.4 : 1,
                                    display: 'flex',
                                    alignItems: 'center',
                                    gap: '0.2rem',
                                  }}
                                >
                                  {isCopied ? <><Check size={9} /> Copied!</> : <><Clipboard size={9} /> Copy</>}
                                </button>
                              </div>
                              {isEmpty ? (
                                <div style={{ fontSize: '0.78rem', color: '#475569', fontStyle: 'italic' }}>No content stored</div>
                              ) : (
                                <div style={{ fontSize: '0.78rem', color: '#e0e0e0', lineHeight: 1.5, whiteSpace: 'pre-wrap', wordBreak: 'break-word', maxHeight: '150px', overflowY: 'auto' }}>
                                  {content}
                                </div>
                              )}
                            </div>
                          );
                        })}
                      </div>
                    )}
                  </div>
                ))}
              </div>
            ))}
          </div>
        ))}
      </div>

      {/* Template form modal (create/edit/clone) */}
      {modalState.open && (
        <TemplateFormModal
          mode={modalState.mode}
          template={modalState.template}
          onClose={() => setModalState({ open: false, mode: 'create', template: null })}
          onSuccess={fetchTemplates}
        />
      )}

      {/* Delete confirmation modal */}
      <DeleteConfirmModal
        template={deleteTarget}
        onConfirm={() => {
          setDeleteTarget(null);
          fetchTemplates();
        }}
        onCancel={() => setDeleteTarget(null)}
      />
    </div>
  );
}