#!/usr/bin/env node
/**
 * reindex-print-materials.mjs
 *
 * Reindexa print_materials desde Directus a Typesense.
 *
 * Los items de Directus contienen traducciones anidadas (translations[]),
 * cada una con sus propios archivos (files[]) e imágenes (files_images[]).
 *
 * USO:
 *   node reindex-print-materials.mjs
 *   node reindex-print-materials.mjs --limit 10 --offset 0
 *   node reindex-print-materials.mjs --dry-run --limit 5
 *
 * Config: copiar .env.example a .env y llenar variables.
 */

const __start = Date.now();

// ── Config desde .env ────────────────────────────────────────────
import { readFileSync, existsSync } from 'node:fs';
import { resolve, dirname } from 'node:path';
import { fileURLToPath } from 'node:url';

const __dir = dirname(fileURLToPath(import.meta.url));
const dotEnv = resolve(__dir, '.env');

function loadEnv(path) {
  if (!existsSync(path)) return {};
  const env = {};
  for (const line of readFileSync(path, 'utf-8').split('\n')) {
    const trimmed = line.trim();
    if (!trimmed || trimmed.startsWith('#') || !trimmed.includes('=')) continue;
    const eq = trimmed.indexOf('=');
    const key = trimmed.slice(0, eq).trim();
    const val = trimmed.slice(eq + 1).trim().replace(/^["']|["']$/g, '');
    env[key] = val;
  }
  return env;
}

const dotenv = loadEnv(dotEnv);

// ── CLI args ─────────────────────────────────────────────────────
const ARGS = {};
for (const arg of process.argv.slice(2)) {
  if (arg === '--dry-run') ARGS.dryRun = true;
  else if (arg.startsWith('--limit=')) ARGS.limit = parseInt(arg.split('=')[1], 10);
  else if (arg === '--limit') ARGS.limit = parseInt(process.argv[process.argv.indexOf(arg) + 1], 10);
  else if (arg.startsWith('--offset=')) ARGS.offset = parseInt(arg.split('=')[1], 10);
  else if (arg === '--offset') ARGS.offset = parseInt(process.argv[process.argv.indexOf(arg) + 1], 10);
}

// ── CFG ──────────────────────────────────────────────────────────
const CFG = {
  directusUrl:   dotenv.PRINT_DIRECTUS_URL || dotenv.DIRECTUS_URL || process.env.PRINT_DIRECTUS_URL || process.env.DIRECTUS_URL || '',
  directusToken: dotenv.PRINT_DIRECTUS_TOKEN || dotenv.DIRECTUS_TOKEN || process.env.PRINT_DIRECTUS_TOKEN || process.env.DIRECTUS_TOKEN || '',
  typesenseUrl:  dotenv.PRINT_TYPESENSE_URL || dotenv.TYPESENSE_URL || process.env.PRINT_TYPESENSE_URL || process.env.TYPESENSE_URL || '',
  typesenseKey:  dotenv.PRINT_TYPESENSE_ADMIN_KEY || dotenv.TYPESENSE_ADMIN_KEY || process.env.PRINT_TYPESENSE_ADMIN_KEY || process.env.TYPESENSE_ADMIN_KEY || '',
  typesenseCollection: dotenv.PRINT_TYPESENSE_COLLECTION || dotenv.TYPESENSE_COLLECTION || process.env.PRINT_TYPESENSE_COLLECTION || process.env.TYPESENSE_COLLECTION || 'print-materials',
  batchSize:     parseInt(dotenv.BATCH_SIZE     || process.env.BATCH_SIZE     || '500'),
  pageLimit:     parseInt(dotenv.PAGE_LIMIT     || process.env.PAGE_LIMIT     || '200'),
  limit:         ARGS.limit ?? parseInt(dotenv.LIMIT || process.env.LIMIT || '0'),
  offset:        ARGS.offset ?? parseInt(dotenv.OFFSET || process.env.OFFSET || '0'),
  dryRun:        !!ARGS.dryRun,
};

// ── Helpers ──────────────────────────────────────────────────────

const COLORS = {
  red:     s => `\x1b[31m${s}\x1b[0m`,
  green:   s => `\x1b[32m${s}\x1b[0m`,
  yellow:  s => `\x1b[33m${s}\x1b[0m`,
  blue:    s => `\x1b[34m${s}\x1b[0m`,
  magenta: s => `\x1b[35m${s}\x1b[0m`,
  cyan:    s => `\x1b[36m${s}\x1b[0m`,
  gray:    s => `\x1b[90m${s}\x1b[0m`,
  bold:    s => `\x1b[1m${s}\x1b[0m`,
};

function log(...args) { console.log(...args); }

function elapsed() {
  const sec = Math.floor((Date.now() - __start) / 1000);
  const m = Math.floor(sec / 60);
  const s = sec % 60;
  return m > 0 ? `${m}m ${s}s` : `${s}s`;
}

function fmtNum(n) {
  return n.toLocaleString('en-US');
}

// ── API calls ────────────────────────────────────────────────────

async function directusFetch(path) {
  const url = `${CFG.directusUrl}/items/${path}`;
  const sep = path.includes('?') ? '&' : '?';
  const fullUrl = `${url}${sep}access_token=${CFG.directusToken}`;

  const res = await fetch(fullUrl, {
    headers: { 'User-Agent': 'reindex/1.0' },
  });
  if (!res.ok) {
    const text = await res.text().catch(() => '');
    throw new Error(`Directus ${res.status} ${res.statusText}: ${text.slice(0, 200)}`);
  }
  return res.json();
}

async function typesenseImport(docs) {
  if (docs.length === 0) return { success: 0, error: 0, errors: [] };

  const body = docs.map(d => JSON.stringify(d)).join('\n');
  const url = `${CFG.typesenseUrl}/collections/${CFG.typesenseCollection}/documents/import?action=upsert`;
  const res = await fetch(url, {
    method: 'POST',
    headers: {
      'X-TYPESENSE-API-KEY': CFG.typesenseKey,
      'Content-Type': 'text/plain',
    },
    body,
  });

  const text = await res.text();

  let success = 0, error = 0;
  const errors = [];

  if (!text.startsWith('{')) {
    throw new Error(`Typesense import devolvió formato inesperado: ${text.slice(0, 200)}`);
  }

  for (const line of text.trim().split('\n')) {
    if (!line.trim()) continue;
    try {
      const result = JSON.parse(line);
      if (result.success) success++;
      else { error++; errors.push(result.error || 'desconocido'); }
    } catch (e) {
      error++;
      errors.push(`error parseando línea: ${line.slice(0, 100)}`);
    }
  }

  return { success, error, errors };
}

// ── Helpers de transformación ────────────────────────────────────

function toUnixTimestamp(dateStr) {
  if (!dateStr) return undefined;
  const ts = Math.floor(new Date(dateStr).getTime() / 1000);
  return isNaN(ts) ? undefined : ts;
}

function getThumbnail(material) {
  return material.thumbnail?.filename_disk ?? null;
}

// ── Transformación ───────────────────────────────────────────────
// Replica la lógica del n8n (formateo a Typesense)

function transformMaterial(material) {
  const translations = material.translations || [];
  const docs = [];

  for (const t of translations) {
    if (!t.title) continue;

    const doc = {
      id:          String(material.id) + '_' + t.languages_code,
      material_id: material.id,
      title:       t.title,
      thumbnail:   getThumbnail(material),
      slug:        t.slug || String(material.id),
      locale:      t.languages_code,
      type:        material.type,
      private:     !!t.private,
      images: (t.files_images || []).map(item => ({
        file: item.directus_files_id?.filename_disk || '',
        downloadname: '',
      })).filter(img => img.file),
      files: (t.files || []).map(item => ({
        filename: item.file?.filename_disk || '',
        downloadname: item.name || '',
        type: item.tipo || '',
      })).filter(f => f.filename),
      related: (material.material_relacionado || []).map(item => {
        const val = typeof item === 'object' ? (item.related_print_materials_id ?? item) : item;
        return parseInt(val, 10);
      }).filter(n => !isNaN(n)),
    };

    const printCategory = (material.print_category || [])
      .map(item => String(typeof item === 'object' ? (item.print_categories_id ?? item.id ?? item) : item))
      .join(',') || undefined;
    if (printCategory) doc['print-category'] = printCategory;

    if (t.slug_personalizado) doc['custom-slug'] = t.slug_personalizado;
    if (material.subtype)     doc.subtype = material.subtype;
    if (material.number != null) doc.number = material.number;
    if (t.notas)              doc.notes = t.notas;

    const ts = toUnixTimestamp(material.date);
    if (ts !== undefined) doc.date = ts;

    docs.push(doc);
  }

  return docs;
}

// ── Fetch desde Directus ─────────────────────────────────────────

async function fetchAllMaterials() {
  const allItems = [];
  let page = 1;
  let hasMore = true;

  const fields = [
    '*',
    'thumbnail.filename_disk',
    'translations.*',
    'translations.files.*',
    'translations.files.file.filename_disk',
    'translations.files_images.*',
    'translations.files_images.directus_files_id.filename_disk',
    'material_relacionado.related_print_materials_id',
    'print_category.print_categories_id',
  ];

  const fieldsParam = fields.map(f => `fields[]=${encodeURIComponent(f)}`).join('&');

  const limit = CFG.limit > 0 ? Math.min(CFG.limit, CFG.pageLimit) : CFG.pageLimit;
  const offset = CFG.offset || 0;
  let remaining = CFG.limit > 0 ? CFG.limit : Infinity;

  while (hasMore && remaining > 0) {
    const currentLimit = Math.min(limit, remaining);
    const pageOffset = offset + ((page - 1) * currentLimit);
    const qs = `print_materials?limit=${currentLimit}&page=${page}&offset=${pageOffset}&${fieldsParam}`;

    log(COLORS.blue(`  → Directus: page ${page} (limit ${currentLimit}, offset ${pageOffset})...`));

    const json = await directusFetch(qs);
    const items = json.data || [];

    if (items.length === 0) {
      hasMore = false;
      break;
    }

    for (const item of items) {
      allItems.push(item);
      remaining--;
    }

    page++;
    if (items.length < currentLimit) hasMore = false;
  }

  return allItems;
}

// ── Main ─────────────────────────────────────────────────────────

async function main() {
  log('');
  log(COLORS.bold(COLORS.cyan('════════════════════════════════════════')));
  log(COLORS.bold(COLORS.cyan('   REINDEX PRINT-MATERIALS → TYPESENSE')));
  log(COLORS.bold(COLORS.cyan('════════════════════════════════════════')));
  log('');

  // ── Validación ────────────────────────────────────────
  const missing = [];
  if (!CFG.directusUrl)   missing.push('DIRECTUS_URL');
  if (!CFG.directusToken) missing.push('DIRECTUS_TOKEN');
  if (!CFG.typesenseUrl)  missing.push('TYPESENSE_URL');
  if (!CFG.typesenseKey)  missing.push('TYPESENSE_ADMIN_KEY');

  if (missing.length > 0) {
    log(COLORS.red(`  ❌ Faltan variables: ${missing.join(', ')}`));
    log(COLORS.gray(`     Copia .env.example a .env y completa los valores`));
    process.exit(1);
  }

  log(`  Tiposense: ${COLORS.blue(CFG.typesenseUrl)}/collections/${COLORS.cyan(CFG.typesenseCollection)}`);
  log(`  Directus:  ${COLORS.blue(CFG.directusUrl)}`);
  if (CFG.limit > 0) log(`  Límite: ${COLORS.yellow(fmtNum(CFG.limit))} registros`);
  if (CFG.offset > 0) log(`  Offset: ${COLORS.yellow(fmtNum(CFG.offset))} (saltando los primeros)`);
  if (CFG.dryRun)    log(`  ${COLORS.magenta('Modo: DRY RUN — no se escribirá nada en Typesense')}`);
  log('');

  // ── 1. Fetch desde Directus ───────────────────────────
  log(COLORS.bold('Fase 1: Leyendo datos desde Directus...'));
  let materials;
  try {
    materials = await fetchAllMaterials();
  } catch (err) {
    log(COLORS.red(`  ❌ Error leyendo Directus: ${err.message}`));
    process.exit(1);
  }

  log(COLORS.green(`  ✅ ${fmtNum(materials.length)} print_materials leídos (${elapsed()})`));
  log('');

  // ── 2. Transformar ────────────────────────────────────
  log(COLORS.bold('Fase 2: Transformando datos...'));
  const documents = [];
  let materialsWithContent = 0;

  for (const material of materials) {
    const docs = transformMaterial(material);
    documents.push(...docs);
    if (docs.length > 0) materialsWithContent++;
  }

  log(COLORS.green(`  ✅ ${fmtNum(documents.length)} documentos generados desde ${fmtNum(materialsWithContent)} materiales`));
  log('');

  // ── Dry-run: salir ────────────────────────────────────
  if (CFG.dryRun) {
    log(COLORS.magenta('╔══════════════════════════════════════╗'));
    log(COLORS.magenta('║   DRY RUN — nada se importó         ║'));
    log(COLORS.magenta('╚══════════════════════════════════════╝'));
    log('');
    if (documents.length > 0) {
      log(COLORS.gray('  Primer documento (sample):'));
      log(COLORS.gray(`  ${JSON.stringify(documents[0], null, 2).slice(0, 800)}`));
    }
    log('');
    return;
  }

  // ── 3. Importar a Typesense ───────────────────────────
  log(COLORS.bold(`Fase 3: Importando a Typesense (batches de ${CFG.batchSize})...`));
  log(COLORS.gray('     (upsert: si el id existe se actualiza, si no se crea)'));

  let totalOk = 0, totalFail = 0;
  const allErrors = [];

  for (let i = 0; i < documents.length; i += CFG.batchSize) {
    const batch = documents.slice(i, i + CFG.batchSize);
    const label = `[${fmtNum(i + 1)}–${fmtNum(Math.min(i + CFG.batchSize, documents.length))}/${fmtNum(documents.length)}]`;
    try {
      const result = await typesenseImport(batch);
      totalOk += result.success;
      totalFail += result.error;
      allErrors.push(...result.errors);
      const color = result.error > 0 ? COLORS.yellow : COLORS.green;
      log(color(`    ${label}: ${fmtNum(result.success)} ok, ${fmtNum(result.error)} fail`));
    } catch (err) {
      log(COLORS.red(`    ${label} ERROR: ${err.message}`));
      totalFail += batch.length;
    }
  }

  log('');

  // ── Reporte final ─────────────────────────────────────
  const hasErrors = totalFail > 0;
  const titleColor = hasErrors ? COLORS.yellow : COLORS.green;

  log(titleColor(COLORS.bold('════════════════════════════════════════')));
  log(titleColor(COLORS.bold('   REPORTE FINAL')));
  log(titleColor(COLORS.bold('════════════════════════════════════════')));
  log('');
  log(`  Directus:`);
  log(`    print_materials:          ${COLORS.cyan(fmtNum(materials.length))}`);
  log(`    con traducciones:         ${COLORS.cyan(fmtNum(materialsWithContent))}`);
  log('');
  log(`  Typesense (${CFG.typesenseCollection}):`);
  const ok = COLORS.green(fmtNum(totalOk));
  const fail = totalFail > 0 ? COLORS.red(fmtNum(totalFail)) : COLORS.green(fmtNum(totalFail));
  log(`    ${ok} importados, ${fail} errores`);
  log('');
  log(`  ${COLORS.bold('Duración:')} ${elapsed()}`);
  log('');

  if (allErrors.length > 0) {
    log(COLORS.yellow(COLORS.bold('  ⚠️  Errores de Typesense (primeros 10):')));
    for (const err of allErrors.slice(0, 10)) {
      log(COLORS.red(`    - ${err}`));
    }
    if (allErrors.length > 10) {
      log(COLORS.gray(`    ... y ${allErrors.length - 10} más`));
    }
    log('');
  }

  if (documents.length > 0) {
    log(COLORS.gray('  Muestra — primer documento importado:'));
    log(COLORS.gray(`    id:             ${documents[0].id}`));
    log(COLORS.gray(`    material_id:    ${documents[0].material_id}`));
    log(COLORS.gray(`    title:          ${(documents[0].title ?? '').slice(0, 60)}`));
    log(COLORS.gray(`    locale:         ${documents[0].locale}`));
    log(COLORS.gray(`    type:           ${documents[0].type}`));
    log(COLORS.gray(`    private:        ${documents[0].private}`));
    log(COLORS.gray(`    files:          ${(documents[0].files ?? []).length}`));
    log(COLORS.gray(`    images:         ${(documents[0].images ?? []).length}`));
    log(COLORS.gray(`    related:        ${JSON.stringify(documents[0].related ?? [])}`));
    log('');
  }

  log(COLORS.bold(hasErrors ? COLORS.yellow('  ⚠️  Proceso completado con errores') : COLORS.green('  ✅ Proceso completado exitosamente')));
  log('');
}

main().catch(err => {
  log(COLORS.red(`\n  ❌ Error fatal: ${err.message}`));
  log(err.stack);
  process.exit(1);
});