// Migration: Create queue_remediation_notes table
// Stores remediation notes for Ivanti todo queue items (append-only).
// FK cascade ensures notes are deleted when the parent queue item is removed.
// Idempotent — safe to re-run multiple times.
const pool = require('../db');

async function run() {
    console.log('Starting queue_remediation_notes migration...');

    // Verify prerequisite table exists
    const { rows: queueTable } = await pool.query(`
        SELECT 1 FROM information_schema.tables
        WHERE table_schema = 'public' AND table_name = 'ivanti_todo_queue'
    `);
    if (queueTable.length === 0) {
        console.error('✗ ivanti_todo_queue table does not exist. Cannot proceed.');
        process.exit(1);
    }
    console.log('✓ ivanti_todo_queue table exists');

    // Create queue_remediation_notes table
    await pool.query(`
        CREATE TABLE IF NOT EXISTS queue_remediation_notes (
            id SERIAL PRIMARY KEY,
            queue_item_id INTEGER NOT NULL REFERENCES ivanti_todo_queue(id) ON DELETE CASCADE,
            user_id INTEGER NOT NULL,
            username VARCHAR(100) NOT NULL,
            note_text TEXT NOT NULL,
            created_at TIMESTAMPTZ DEFAULT NOW(),
            CONSTRAINT chk_note_text_length CHECK (char_length(note_text) <= 5000)
        )
    `);
    console.log('✓ queue_remediation_notes table created (or already exists)');

    // Create index on queue_item_id for efficient lookup
    await pool.query(`
        CREATE INDEX IF NOT EXISTS idx_remediation_notes_queue_item
        ON queue_remediation_notes(queue_item_id)
    `);
    console.log('✓ queue_item_id index created (or already exists)');

    console.log('Migration complete.');
    process.exit(0);
}

run().catch(err => {
    console.error('Migration failed:', err.message);
    process.exit(1);
});