/**
 * generate-cl-seed.cjs
 *
 * Reads both Punchlist_Reference sheets from the Excel templates and writes
 * sql/cl-seed.sql containing INSERT statements for:
 *   - admin_categories      (unique category values)
 *   - admin_sub_categories  (unique sub-category per category, with FK)
 *   - admin_severities      (unique severity values, normalised to title-case)
 *   - admin_cl_records      (every valid row – skips rows with no severity)
 *
 * Run inside the Docker app container:
 *   node /workspace/scripts/generate-cl-seed.cjs
 *
 * Normalisation rules applied to severities:
 *   - Leading / trailing whitespace stripped.
 *   - Each word capitalised (title-case) so that "major", "Major" and
 *     "MAJOR" all become "Major"; "on hold" / "On hold" both become "On Hold".
 *   - Rows whose severity cell is empty, null or undefined are skipped entirely.
 */

'use strict';

const XLSX = require('/app/node_modules/xlsx');
const fs   = require('fs');
const path = require('path');

// ─── helpers ────────────────────────────────────────────────────────────────

/** Escape a value for use inside a SQL single-quoted string literal.
 *  - Replaces CR/LF sequences and bare LF with a single space so the SQL
 *    file stays on one logical line per value (avoids broken multi-line
 *    string literals that confuse some SQL clients).
 *  - Escapes embedded single quotes by doubling them.
 */
function esc(v) {
  if (v == null) return '';
  return String(v)
    .replace(/\r\n|\r|\n/g, ' ')   // collapse newlines to space
    .replace(/'/g, "''");           // escape single quotes
}

/**
 * Convert a string to title-case.
 * "on hold" → "On Hold"   "major" → "Major"
 */
function toTitleCase(str) {
  return str
    .trim()
    .replace(/\w\S*/g, w => w.charAt(0).toUpperCase() + w.slice(1).toLowerCase());
}

// ─── load both files ─────────────────────────────────────────────────────────

const FILES = [
  '/workspace/cl_template/OVXXX_AURORA_ANT_CL_MW_V3.2_20220502.xlsx',
  '/workspace/cl_template/OVXXX_AURORA_CW_QC_MW_V3.2_20220502.xlsx',
];

const allRows = [];   // { sort_order, category, sub_category, desc_en, desc_fr, desc_nl, severity }

for (const filePath of FILES) {
  const wb   = XLSX.readFile(filePath);
  const ws   = wb.Sheets['Punchlist_Reference'];
  const data = XLSX.utils.sheet_to_json(ws, { header: 1 });

  // Row 0 is the header; skip it.
  for (let i = 1; i < data.length; i++) {
    const row = data[i];

    // Column A (index 0) must have a numeric sort_order; empty trailing rows skipped.
    if (row[0] == null) continue;

    const sortOrder  = Number(row[0]);
    const category   = String(row[4] ?? '').trim();
    const subCat     = String(row[5] ?? '').trim();
    const descEn     = String(row[6] ?? '').trim();
    const descFr     = String(row[7] ?? '').trim();
    const descNl     = String(row[8] ?? '').trim();
    const severityRaw = row[9];

    // Skip rows that carry no severity value.
    if (severityRaw == null || String(severityRaw).trim() === '') {
      console.warn(`  Skipping row sort_order=${sortOrder}: no severity value`);
      continue;
    }

    const severity = toTitleCase(String(severityRaw));

    allRows.push({ sortOrder, category, subCat, descEn, descFr, descNl, severity });
  }
}

console.log(`Loaded ${allRows.length} valid rows total.`);

// ─── derive unique lookup sets (insertion-order preserved via Map) ────────────

// Categories: unique by value
const categoriesMap = new Map();   // value → true  (just for dedup, order preserved)
for (const r of allRows) {
  if (!categoriesMap.has(r.category)) categoriesMap.set(r.category, true);
}
const categories = [...categoriesMap.keys()];   // ordered list

// Sub-categories: unique by (category, subCat)
const subCatMap = new Map();   // "category|||subCat" → { category, subCat }
for (const r of allRows) {
  const key = `${r.category}|||${r.subCat}`;
  if (!subCatMap.has(key)) subCatMap.set(key, { category: r.category, subCat: r.subCat });
}
const subCats = [...subCatMap.values()];

// Severities: unique by normalised value
const severitiesMap = new Map();
for (const r of allRows) {
  if (!severitiesMap.has(r.severity)) severitiesMap.set(r.severity, true);
}
const severities = [...severitiesMap.keys()];

console.log(`Categories: ${categories.length}, SubCategories: ${subCats.length}, Severities: ${severities.length}`);

// ─── build SQL ───────────────────────────────────────────────────────────────

const lines = [];

lines.push('-- ============================================================');
lines.push('-- cl-seed.sql');
lines.push('--');
lines.push('-- Auto-generated from Punchlist_Reference sheets in:');
lines.push('--   OVXXX_AURORA_ANT_CL_MW_V3.2_20220502.xlsx');
lines.push('--   OVXXX_AURORA_CW_QC_MW_V3.2_20220502.xlsx');
lines.push('--');
lines.push('-- Generated: ' + new Date().toISOString());
lines.push('--');
lines.push('-- Severity values are normalised to title-case.');
lines.push('-- Records with no severity are omitted.');
lines.push('-- Use INSERT IGNORE so re-running the script is idempotent.');
lines.push('-- ============================================================');
lines.push('');
lines.push('USE check_list;');
lines.push('');

// ── 1. admin_categories ────────────────────────────────────────────────────
lines.push('-- ── 1. Categories ────────────────────────────────────────────');
lines.push('INSERT IGNORE INTO admin_categories (value) VALUES');
const catValues = categories.map(c => `  ('${esc(c)}')`);
lines.push(catValues.join(',\n') + ';');
lines.push('');

// ── 2. admin_sub_categories ───────────────────────────────────────────────
// FK to admin_categories resolved via a UNION ALL derived table.
// (The VALUES ROW() syntax requires MariaDB ≥ 10.3.3; UNION ALL is universal.)
lines.push('-- ── 2. Sub-categories (FK resolved via sub-select) ──────────');
lines.push('INSERT IGNORE INTO admin_sub_categories (value, category_id)');
lines.push('SELECT vals.value, c.id');
lines.push('FROM (');
const scValues = subCats.map(
  (sc, i) =>
    `  ${i === 0 ? 'SELECT' : 'UNION ALL SELECT'} '${esc(sc.subCat)}' AS value, '${esc(sc.category)}' AS cat_value`
);
lines.push(scValues.join('\n'));
lines.push(') AS vals');
lines.push('JOIN admin_categories c ON c.value = vals.cat_value;');
lines.push('');

// ── 3. admin_severities ──────────────────────────────────────────────────
lines.push('-- ── 3. Severities ───────────────────────────────────────────');
lines.push('INSERT IGNORE INTO admin_severities (value) VALUES');
const sevValues = severities.map(s => `  ('${esc(s)}')`);
lines.push(sevValues.join(',\n') + ';');
lines.push('');

// ── 4. admin_cl_records ──────────────────────────────────────────────────
lines.push('-- ── 4. Check-list records ───────────────────────────────────');
lines.push('INSERT IGNORE INTO admin_cl_records');
lines.push('  (sort_order, category, sub_category, severity, description_en, description_fr, description_nl)');
lines.push('VALUES');
const recValues = allRows.map(r =>
  `  (${r.sortOrder}, '${esc(r.category)}', '${esc(r.subCat)}', '${esc(r.severity)}', '${esc(r.descEn)}', '${esc(r.descFr)}', '${esc(r.descNl)}')`
);
lines.push(recValues.join(',\n') + ';');
lines.push('');

// ─── write output file ───────────────────────────────────────────────────────

const outPath = '/workspace/sql/cl-seed.sql';
fs.writeFileSync(outPath, lines.join('\n'), 'utf8');
console.log(`\nSQL written to ${outPath}`);
console.log(`  ${categories.length} categories`);
console.log(`  ${subCats.length} sub-categories`);
console.log(`  ${severities.length} severities`);
console.log(`  ${allRows.length} cl_records`);