#!/usr/bin/env node
/**
 * reindex-entrelineas.mjs
 *
 * Reindexa entrelineas_translations desde Directus a Typesense.
 * Los items se transforman según la lógica del flow de Directus
 * (decodeEntities → stripHtml → cleanHtml).
 *
 * USO:
 *   node reindex-entrelineas.mjs
 *   node reindex-entrelineas.mjs --limit 100 --offset 200
 *   node reindex-entrelineas.mjs --dry-run --limit 50
 *
 * 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.ENTRELINEAS_DIRECTUS_URL || dotenv.DIRECTUS_URL || process.env.ENTRELINEAS_DIRECTUS_URL || process.env.DIRECTUS_URL || '',
  directusToken: dotenv.ENTRELINEAS_DIRECTUS_TOKEN || dotenv.DIRECTUS_TOKEN || process.env.ENTRELINEAS_DIRECTUS_TOKEN || process.env.DIRECTUS_TOKEN || '',
  typesenseUrl:  dotenv.ENTRELINEAS_TYPESENSE_URL || dotenv.TYPESENSE_URL || process.env.ENTRELINEAS_TYPESENSE_URL || process.env.TYPESENSE_URL || '',
  typesenseKey:  dotenv.ENTRELINEAS_TYPESENSE_ADMIN_KEY || dotenv.TYPESENSE_ADMIN_KEY || process.env.ENTRELINEAS_TYPESENSE_ADMIN_KEY || process.env.TYPESENSE_ADMIN_KEY || '',
  typesenseCollection: dotenv.TYPESENSE_COLLECTION || process.env.TYPESENSE_COLLECTION || 'entrelineas',
  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 };
}

// ── HTML utilities (desde el Directus flow) ──────────────────────

const NAMED = {
  amp: '&', lt: '<', gt: '>', quot: '"', apos: "'", nbsp: ' ',
  aacute: 'á', eacute: 'é', iacute: 'í', oacute: 'ó', uacute: 'ú',
  Aacute: 'Á', Eacute: 'É', Iacute: 'Í', Oacute: 'Ó', Uacute: 'Ú',
  ntilde: 'ñ', Ntilde: 'Ñ',
  uuml: 'ü', Uuml: 'Ü',
  iquest: '¿', iexcl: '¡',
  ldquo: '\u201C', rdquo: '\u201D', lsquo: '\u2018', rsquo: '\u2019',
  laquo: '«', raquo: '»',
  mdash: '\u2014', ndash: '\u2013',
  hellip: '\u2026', middot: '·',
};

function decodeEntities(str) {
  if (!str || typeof str !== 'string') return str;
  return str.replace(/&(#x?[0-9a-fA-F]+|[a-zA-Z]+);/g, (full, body) => {
    if (body[0] === '#') {
      const isHex = body[1] === 'x' || body[1] === 'X';
      const code = parseInt(isHex ? body.slice(2) : body.slice(1), isHex ? 16 : 10);
      if (Number.isFinite(code)) {
        try { return String.fromCodePoint(code); } catch (_) { return full; }
      }
      return full;
    }
    return NAMED[body] != null ? NAMED[body] : full;
  });
}

function stripHtml(str) {
  if (!str || typeof str !== 'string') return str;
  return str
    .replace(/<(br|p|div|li|tr|td|th|h[1-6]|blockquote|pre)(\s[^>]*)?\/?>/gi, ' ')
    .replace(/<[^>]+>/g, '')
    .replace(/\s+/g, ' ')
    .replace(/«\s+/g, '«')
    .replace(/\s+»/g, '»')
    .trim();
}

function cleanHtml(str) {
  if (!str || typeof str !== 'string') return str;
  return str
    .replace(/<style[^>]*>[\s\S]*?<\/style>/gi, '')
    .replace(/\s+class=(["'])[^"']*\1/gi, '')
    .replace(/\s+data-[\w-]+=(["'])[^"']*\1/gi, '')
    .replace(/\bwidth\s*:\s*[\d.]+\s*(?:cm|mm|pt|px|em|rem|in|pc)\s*;?/gi, '')
    .replace(/[ \t]*[\r\n]+[ \t]*/g, ' ')
    .trim();
}

// ── Transformación ───────────────────────────────────────────────

function transformItem(data) {
  const rel = data.entrelineas_id || {};

  const rawLocale = data.languages_code;
  const locale = typeof rawLocale === 'string' ? rawLocale : (rawLocale?.code ?? '');

  return {
    id: `${rel.id}`,
    type: rel.type,
    filter: rel.filter,
    locale,
    origin: data.description,
    image: rel.image?.filename_disk ?? null,
    text: stripHtml(decodeEntities(data.text)),
    html: cleanHtml(data.text),
    draft: rel.draft ?? false,
  };
}

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

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

  const fields = [
    '*',
    'entrelineas_id.*',
    'entrelineas_id.image.*',
  ].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 = `entrelineas_translations?limit=${currentLimit}&page=${page}&offset=${pageOffset}&fields=${encodeURIComponent(fields)}`;

    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 ENTRELINEAS → 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 translations;
  try {
    translations = await fetchAllTranslations();
  } catch (err) {
    log(COLORS.red(`  ❌ Error leyendo Directus: ${err.message}`));
    process.exit(1);
  }

  log(COLORS.green(`  ✅ ${fmtNum(translations.length)} entrelineas_translations leídas (${elapsed()})`));
  log('');

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

  for (const item of translations) {
    documents.push(transformItem(item));
  }

  log(COLORS.green(`  ✅ ${fmtNum(documents.length)} documentos para ${CFG.typesenseCollection}`));
  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, 600)}`));
    }
    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(`    entrelineas_translations:  ${COLORS.cyan(fmtNum(translations.length))}`);
  log('');
  log(`  Typesense (${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(`    type:   ${documents[0].type}`));
    log(COLORS.gray(`    filter: ${documents[0].filter}`));
    log(COLORS.gray(`    locale: ${documents[0].locale}`));
    log(COLORS.gray(`    image:  ${documents[0].image ?? '(sin imagen)'}`));
    log(COLORS.gray(`    draft:  ${documents[0].draft}`));
    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);
});