// Host-side server. After the module extraction this shrunk from
// ~700 lines (the original editor's server.js) to a thin wrapper
// that mounts the module's middleware + provides the host's own
// upload endpoint.
//
// What stayed in the host
// ───────────────────────
//   • The HTTP server itself (express, port binding, listen)
//   • CORS, rate limiting, logger — host-level concerns
//   • The /api/upload endpoint (host owns upload storage)
//   • SPA static serving for the built frontend
//   • Cleanup of old uploaded files (TTL sweep)
//
// What moved to the module (goods-editor/server)
// ──────────────────────────────────────────────
//   • POST /api/export — the canvas+sharp render pipeline
//   • GET  /api/download/:filename — serve exported PNGs
//   • GET  /api/health — health probe
//   • Font registration with node-canvas, plus GET
//     /api/fonts/fonts.css and GET /api/fonts/<filename>
//     for browser-side delivery. index.html loads the .css
//     directly; the Google Fonts CDN link the host used to
//     ship is gone with v0.8.
//   • POST/GET/DELETE /api/designs/* — design persistence,
//     mounted only when a Postgres `db` handle is passed to
//     mountEditorApi. Wired (#23): we pass pgPool when
//     DATABASE_URL is set; without it the routes don't mount
//     and the client falls back to cart-without-design_id.

import express from 'express';
import cors from 'cors';
import multer from 'multer';
import { v4 as uuidv4 } from 'uuid';
import sharp from 'sharp';
import canvas from 'canvas';
import rateLimit from 'express-rate-limit';
import pino from 'pino';
import pinoHttp from 'pino-http';
import { fileURLToPath } from 'url';
import { basename, dirname, join, resolve } from 'path';
import { mkdirSync, existsSync, readdirSync, readFileSync, statSync, rmSync } from 'fs';

import { mountEditorApi } from 'goods-editor/server';
import { renderDesignComposite } from 'goods-editor/server';
import { mountTemplateStore } from 'template-manager/server';
import { marketingPreviewRenderer } from 'template-manager/server';
import { mountAuth, runMigrations } from '@khalidadil/auth-manager/server';
import pkg from 'pg';
const { Pool } = pkg;
import { SEED_PRODUCTS } from './src/constants/seedProducts.js';

const __filename = fileURLToPath(import.meta.url);
const __dirname = dirname(__filename);

const app = express();
const PORT = process.env.PORT || 3001;
const IS_PRODUCTION = process.env.NODE_ENV === 'production';

const logger = pino({
  level: process.env.LOG_LEVEL || 'info',
  base: { service: 'apparel-designer' },
});

app.use(pinoHttp({
  logger,
  autoLogging: { ignore: (req) => req.url === '/api/health' },
}));

// ── Filesystem layout ──────────────────────────────────────────────
const uploadsDir = join(__dirname, 'uploads');
const exportsDir = join(__dirname, 'exports');
const templatesStorageDir = join(__dirname, 'templates');
const fontsDir = join(__dirname, 'node_modules', 'goods-editor', 'fonts');
const stickersDir = IS_PRODUCTION
  ? join(__dirname, 'dist', 'stickers')
  : join(__dirname, 'public', 'stickers');
// (uploadsRoot + `sep` removed — dead since the path-guarded routes
// moved into goods-editor/template-manager; eslint now parses this
// file (ecmaVersion 2022) and flagged them.)

// v0.6 — mockupsDir is gone (variant mockups removed). Product
// mockups live under templatesStorageDir/products/<id>/sizes/<sid>/
// and are managed entirely by template-manager.
[uploadsDir, exportsDir, templatesStorageDir].forEach((dir) => {
  if (!existsSync(dir)) mkdirSync(dir, { recursive: true });
});

// ── TTL cleanup ─────────────────────────────────────────────────────
const FILE_TTL_MS = parseInt(process.env.FILE_TTL_MS || '', 10) || 24 * 60 * 60 * 1000;
const CLEANUP_INTERVAL_MS = parseInt(process.env.CLEANUP_INTERVAL_MS || '', 10) || 60 * 60 * 1000;

// Referenced-file exemption (#24) — template JSONs (element srcs,
// slot previewSrc, entry-config imagery) and persisted designs
// (Postgres designs.design_json) reference files as `/uploads/<name>`
// (or `/uploads/preview/<name>`). Those references are long-lived;
// sweeping the files at 24h breaks template renders and design
// re-renders. Before each sweep pass we collect every referenced
// basename (uploads filenames are UUID-based, so basename matching
// is collision-free) and skip deleting those files. A simple regex
// over raw JSON text keeps this robust to schema drift.
const UPLOADS_REF_RE = /\/uploads\/([A-Za-z0-9._-]+(?:\/[A-Za-z0-9._-]+)*)/g;

function collectUploadRefs(text, out) {
  UPLOADS_REF_RE.lastIndex = 0;
  let m;
  while ((m = UPLOADS_REF_RE.exec(text)) !== null) {
    out.add(basename(m[1]));
  }
}

// Recursively scan a directory's *.json files for /uploads/ references.
// Covers template-manager's whole storage tree: templates/<id>/
// metadata.json + versions/*.json, products/<id>/product.json, and
// the _*.json index docs.
function scanDirForUploadRefs(dir, out) {
  if (!existsSync(dir)) return;
  let entries = [];
  try { entries = readdirSync(dir, { withFileTypes: true }); } catch { return; }
  for (const entry of entries) {
    const full = join(dir, entry.name);
    try {
      if (entry.isDirectory()) {
        scanDirForUploadRefs(full, out);
      } else if (entry.isFile() && entry.name.endsWith('.json')) {
        collectUploadRefs(readFileSync(full, 'utf8'), out);
      }
    } catch { /* unreadable entry — skip */ }
  }
}

// Built fresh once per sweep pass (templates/designs change between
// passes; a single Set per pass is cache enough).
async function collectReferencedUploads() {
  const referenced = new Set();
  try { scanDirForUploadRefs(templatesStorageDir, referenced); } catch { /* never block the sweep */ }
  // Persisted designs — only when Postgres is wired. Any db error
  // (table not migrated yet, connection down) skips silently: the
  // sweep must never crash the host.
  if (pgPool) {
    try {
      const { rows } = await pgPool.query('SELECT design_json FROM designs WHERE deleted_at IS NULL');
      for (const row of rows) {
        collectUploadRefs(JSON.stringify(row.design_json), referenced);
      }
    } catch { /* db unavailable — protect what templates reference */ }
  }
  return referenced;
}

function cleanupOldFiles(dir, ttlMs, protectedNames = null, skipDirs = null) {
  if (!existsSync(dir)) return { removed: 0, protectedCount: 0 };
  const now = Date.now();
  let removed = 0;
  let protectedCount = 0;
  let entries = [];
  try { entries = readdirSync(dir); } catch { return { removed, protectedCount }; }
  for (const entry of entries) {
    const full = join(dir, entry);
    try {
      const stat = statSync(full);
      if (stat.isFile() && now - stat.mtimeMs > ttlMs) {
        if (protectedNames && protectedNames.has(entry)) {
          protectedCount++;
        } else {
          rmSync(full);
          removed++;
        }
      } else if (stat.isDirectory()) {
        if (skipDirs && skipDirs.has(resolve(full))) continue;
        const sub = cleanupOldFiles(full, ttlMs, protectedNames, skipDirs);
        removed += sub.removed;
        protectedCount += sub.protectedCount;
      }
    } catch { /* skip */ }
  }
  return { removed, protectedCount };
}

// exports/designs is goods-editor's designsDir (mountEditorApi default:
// <exportsDir>/designs). It holds persisted design artifacts — source
// images, thumbnails, print renders — whose lifecycle is db-driven
// (designs.deleted_at soft-delete, 30-day guest TTL), not this sweep's
// 24h TTL. Source images in particular are unrecoverable, so the sweep
// skips the whole subtree.
const designsArtifactsDir = resolve(join(exportsDir, 'designs'));

async function runCleanup() {
  try {
    const referenced = await collectReferencedUploads();
    const u = cleanupOldFiles(uploadsDir, FILE_TTL_MS, referenced);
    const e = cleanupOldFiles(exportsDir, FILE_TTL_MS, null, new Set([designsArtifactsDir]));
    if (u.removed > 0 || e.removed > 0 || u.protectedCount > 0) {
      logger.info({
        removedUploads: u.removed,
        removedExports: e.removed,
        protectedUploads: u.protectedCount,
        ttlMs: FILE_TTL_MS,
      }, 'Cleanup pass complete');
    }
  } catch (err) {
    logger.warn({ err: err.message }, 'Cleanup pass failed; will retry next interval');
  }
}
// NOTE: the initial run + interval start AFTER the auth-manager
// bootstrap below — collectReferencedUploads reads `pgPool`, which is
// declared there (TDZ until then).

// ── App-level middleware (CORS, JSON, rate limits) ─────────────────
const corsOptions = IS_PRODUCTION
  ? { origin: process.env.CORS_ORIGIN || false }
  : { origin: true };
app.use(cors(corsOptions));
app.use(express.json({ limit: '50mb' }));
app.use(express.urlencoded({ extended: true, limit: '50mb' }));

// ── Facet personalization config (Project doc §R10) ──────────────
// Env-driven, host-injected into both module mounts. FACET_KEY is the
// master switch — unset ⇒ the feature is inert (facet-config reports
// disabled, the account routes no-op, templates are unfiltered, and the
// editor shows all stickers). The facet *values* (dog/cat/…) are
// admin-managed inside template-manager; only the definition is here.
const envBool = (v, dflt = false) => (
  v === undefined || v === null || v === ''
    ? dflt
    : /^(1|true|yes|on)$/i.test(String(v).trim())
);
const facetConfig = {
  key: (process.env.FACET_KEY || '').trim() || null,
  label: (process.env.FACET_LABEL || '').trim() || null,
  selectionMode: process.env.FACET_SELECTION_MODE === 'single' ? 'single' : 'multi',
  requireSelection: envBool(process.env.REQUIRE_FACET_SELECTION, false),
};
const requireTemplateCategory = envBool(process.env.REQUIRE_TEMPLATE_CATEGORY, false);
if (facetConfig.key) {
  logger.info({
    key: facetConfig.key,
    label: facetConfig.label,
    selectionMode: facetConfig.selectionMode,
    requireSelection: facetConfig.requireSelection,
    requireTemplateCategory,
  }, 'Personalization facet enabled');
}

// ── auth-manager bootstrap ─────────────────────────────────────────
// Runs migrations + mounts auth routes if DATABASE_URL is set. If
// it isn't, we log a warning and continue without auth so a developer
// can still iterate on goods-editor / template-manager pieces without
// provisioning Postgres locally.
let pgPool = null;
if (process.env.DATABASE_URL) {
  pgPool = new Pool({ connectionString: process.env.DATABASE_URL });
  try {
    await runMigrations(pgPool, { logger });
    mountAuth(app, {
      db: pgPool,
      apiBase: '/api',
      callbackBaseUrl: process.env.PUBLIC_BASE_URL || `http://localhost:${PORT}`,
      smtp: process.env.SMTP_HOST ? {
        host: process.env.SMTP_HOST,
        port: process.env.SMTP_PORT,
        user: process.env.SMTP_USER,
        pass: process.env.SMTP_PASS,
        from: process.env.SMTP_FROM,
      } : undefined,
      fromAddress: process.env.SMTP_FROM || 'no-reply@example.com',
      appName: 'Pawfectly Yours',
      googleClientId: process.env.GOOGLE_CLIENT_ID,
      googleClientSecret: process.env.GOOGLE_CLIENT_SECRET,
      adminEmails: (process.env.ADMIN_EMAILS || '').split(',').map((s) => s.trim()).filter(Boolean),
      cookieDomain: process.env.COOKIE_DOMAIN || undefined,
      isProduction: IS_PRODUCTION,
      // Facet personalization (Project doc §R10) — scopes the
      // customer_facet_values rows + adds facetValues to /me. Inert
      // when facetConfig.key is null.
      facet: facetConfig,
      logger,
    });
  } catch (err) {
    logger.error({ err: err.message }, 'auth-manager bootstrap failed; auth disabled');
    try { await pgPool.end(); } catch { /* ignore */ }
    pgPool = null;
  }
} else {
  logger.warn('DATABASE_URL not set — auth-manager disabled. Set DATABASE_URL in .env to enable customer accounts and admin SSO.');
}

// ── goods-editor designs migration (#23) ──────────────────────────
// The module documents that the HOST applies its designs schema before
// passing `db` to mountEditorApi (001_designs.sql is idempotent —
// CREATE TABLE IF NOT EXISTS + CREATE OR REPLACE). With the file: dep
// the SQL is reachable through node_modules; a packed install ships
// dist/ only, so a missing file logs a warning instead of crashing —
// the /designs routes still mount and fail loudly until the table is
// created by hand.
if (pgPool) {
  const designsMigrationPath = join(
    __dirname, 'node_modules', 'goods-editor', 'src', 'server', 'migrations', '001_designs.sql',
  );
  try {
    if (existsSync(designsMigrationPath)) {
      await pgPool.query(readFileSync(designsMigrationPath, 'utf8'));
      logger.info('goods-editor designs migration applied');
    } else {
      logger.warn({ path: designsMigrationPath }, 'goods-editor designs migration not found — apply 001_designs.sql manually before using design persistence');
    }
  } catch (err) {
    logger.error({ err: err.message }, 'goods-editor designs migration failed — POST /api/designs will error until the designs table exists');
  }
}

// TTL sweep kickoff (#24) — here rather than at the definition site
// because collectReferencedUploads reads pgPool.
runCleanup();
setInterval(runCleanup, CLEANUP_INTERVAL_MS).unref();

const uploadLimiter = rateLimit({
  windowMs: 60 * 60 * 1000,
  max: 30,
  standardHeaders: true,
  legacyHeaders: false,
  message: { error: 'Too many upload requests. Please try again later.' },
});

// ── Static serving ─────────────────────────────────────────────────
app.use('/uploads', express.static(uploadsDir));
app.use('/exports', express.static(exportsDir));
if (IS_PRODUCTION) {
  app.use(express.static(join(__dirname, 'dist')));
}

// ── Host-owned: upload endpoint ────────────────────────────────────
const MIME_TO_EXT = {
  'image/jpeg': 'jpg',
  'image/png': 'png',
  'image/webp': 'webp',
};

const storage = multer.diskStorage({
  destination: (_req, _file, cb) => cb(null, uploadsDir),
  filename: (_req, file, cb) => {
    const ext = MIME_TO_EXT[file.mimetype] || 'bin';
    cb(null, `${uuidv4()}.${ext}`);
  },
});

const fileFilter = (_req, file, cb) => {
  if (MIME_TO_EXT[file.mimetype]) {
    cb(null, true);
  } else {
    cb(new Error('Invalid file type. Only JPEG, PNG, and WebP are allowed.'), false);
  }
};

const upload = multer({
  storage, fileFilter,
  limits: { fileSize: 20 * 1024 * 1024 },
});

// Separate multer instance for variant mockup uploads. The template-
// manager's variants route calls `.single('file')` on this and then
// renames `req.file.path` to <mockupsPath>/<productType>/<variant>.png
// inside the route handler. We use disk storage with a temp filename
// in the host's uploadsDir; the rename moves it to its final mockups
// location. Restricted to PNG since that's the file extension the
// route writes — a JPEG/WebP source would end up with a misleading
// .png extension on disk.
const mockupUpload = multer({
  storage: multer.diskStorage({
    destination: (_req, _file, cb) => cb(null, uploadsDir),
    filename: (_req, _file, cb) => cb(null, `mockup-${uuidv4()}.tmp`),
  }),
  fileFilter: (_req, file, cb) => {
    if (file.mimetype === 'image/png') cb(null, true);
    else cb(new Error('Only PNG mockups are accepted.'));
  },
  limits: { fileSize: 10 * 1024 * 1024 },
});

app.post('/api/upload', uploadLimiter, upload.single('image'), async (req, res) => {
  try {
    if (!req.file) {
      return res.status(400).json({ error: 'No file uploaded' });
    }
    const originalUrl = `/uploads/${req.file.filename}`;
    const previewFilename = `${uuidv4()}.png`;
    const previewDir = join(uploadsDir, 'preview');
    if (!existsSync(previewDir)) mkdirSync(previewDir, { recursive: true });

    await sharp(req.file.path)
      .resize({ width: 1000, height: 1000, fit: 'inside' })
      .png()
      .toFile(join(previewDir, previewFilename));

    res.json({
      success: true,
      original: {
        url: originalUrl,
        filename: req.file.filename,
        size: req.file.size,
        mimetype: req.file.mimetype,
      },
      preview: {
        url: `/uploads/preview/${previewFilename}`,
        filename: previewFilename,
      },
    });
  } catch (err) {
    req.log?.error({ err: err.message }, 'Upload pipeline failure');
    res.status(500).json({ error: 'Failed to process upload', details: err.message });
  }
});

// ── Module-owned: editor API (export, download, health) ────────────
// v0.8 (#23) — `db` gates the design-persistence routes (POST/GET/
// DELETE /api/designs…). pgPool is null without DATABASE_URL (or when
// the auth bootstrap failed), in which case the routes simply don't
// mount and the client's persistCurrentDesign 404s into its graceful
// cart-without-design_id fallback.
mountEditorApi(app, {
  canvas,
  sharp,
  exportsDir,
  fontsDir,
  stickersDir,
  uploadsDir,
  basePath: '/api',
  logger,
  db: pgPool,
});

// Template store (admin + public). adminAuth pass-through for v1
// per the plan; v1.5 swaps in a real middleware via server/lib/auth.js.
//
// v0.6 — the host no longer passes a variantCatalog or phoneModels.
// template-manager owns the catalog (productsStore) and accepts a
// seedProducts array used on first boot only. After the first boot,
// the catalog lives in `<templatesStorageDir>/_products_index.json`
// + `<templatesStorageDir>/products/<id>/product.json` and the seed
// is ignored even if it changes (intentional: prevents unintended
// catalog rewrites on server restart).
const templateStore = mountTemplateStore(app, {
  storagePath: templatesStorageDir,
  uploadsPath: uploadsDir,
  adminAuth: (req, res, next) => next(),
  seedProducts: SEED_PRODUCTS,
  multer: mockupUpload,
  logger,
  basePath: '/api',
  // Facet personalization (Project doc §R10) — server-enforced template
  // categorization gate + the facet definition exposed via
  // GET /api/public/facet-config. Both inert when facetConfig.key null.
  requireTemplateCategory,
  facet: facetConfig,
  onTemplateChange: (templateId, kind) => {
    logger.info({ templateId, kind }, 'Template changed');
    // TODO (v0.4): trigger SSG rebuild for the affected template's
    // shop page. v1 no-op; client re-fetches anyway.
  },
});

// ── Marketing preview drainer ──────────────────────────────
//
// Periodically pulls templateIds off the marketing-preview queue and
// renders preview.png for each. The queue is in-memory and populated
// by (a) version creates, (b) variant mockup uploads, and (c) explicit
// regenerate clicks from the admin UI.
//
// Without this drainer, those enqueues accumulate silently — the
// server sets `autoStaleSince` on the metadata but nothing ever
// clears it, so the UI's "regenerating…" badge would stick forever.
//
// Implementation notes
// ────────────────────
//   • The renderer factory takes goods-editor's `renderDesignComposite`
//     as `editorRenderer`. We wrap it here to close over the host's
//     `canvas` module + the mockups/uploads/storage dirs, since
//     marketingPreviewRenderer calls editorRenderer with only the
//     design data (no native deps).
//   • Interval is 2s for snappy admin feedback. Render time on a
//     typical 800×800 composite is well under a second on a modern
//     laptop, so even a quick reload after "Save Version" should
//     find a fresh preview waiting.
//   • We drain ONE item per tick so a burst of enqueues doesn't pin
//     the event loop. Multiple items just get processed over multiple
//     ticks.
//   • .unref() the timer so it doesn't keep the process alive at
//     shutdown.
const renderOne = marketingPreviewRenderer({
  editorRenderer: (designArgs) => renderDesignComposite({
    ...designArgs,
    canvas,
    sharp,
    // v0.6 — mockups now live under templatesStorageDir/products/<id>/
    // sizes/<sid>/mockup.png. renderDesignComposite picks the right
    // path from the resolved variant's `mockupPath` field. We pass
    // templatesStorageDir as a parent for path resolution.
    mockupsDir: templatesStorageDir,
    uploadsDir,
    stickersDir,
    storageDir: templatesStorageDir,
  }),
});

const PREVIEW_DRAIN_INTERVAL_MS = parseInt(
  process.env.PREVIEW_DRAIN_INTERVAL_MS || '',
  10,
) || 2000;

async function drainPreviewQueue() {
  const id = templateStore.marketingPreviewQueue.dequeue();
  if (!id) return;
  try {
    await renderOne({
      templateId: id,
      storagePath: templatesStorageDir,
      // v0.6 — productsStore replaces variantCatalog for variant lookup.
      productsStore: templateStore.productsStore,
      auditLog: templateStore.auditLog,
    });
    logger.info({ templateId: id }, 'Marketing preview rendered');
  } catch (err) {
    logger.error({ templateId: id, err: err.message }, 'Marketing preview render failed');
  }
}

setInterval(drainPreviewQueue, PREVIEW_DRAIN_INTERVAL_MS).unref();

// ── 404 + SPA catch-alls ───────────────────────────────────────────
app.all('/api/*', (_req, res) => {
  res.status(404).json({ error: 'API route not found' });
});

if (IS_PRODUCTION) {
  app.get('*', (_req, res) => {
    res.sendFile(join(__dirname, 'dist', 'index.html'));
  });
}

// ── Error handler ──────────────────────────────────────────────────
app.use((err, req, res, _next) => {
  if (err instanceof multer.MulterError) {
    if (err.code === 'LIMIT_FILE_SIZE') {
      return res.status(400).json({ error: 'File too large. Maximum size is 20MB.' });
    }
    return res.status(400).json({ error: err.message });
  }
  req.log?.error({ err: err.message, stack: err.stack }, 'Unhandled error');
  res.status(500).json({ error: 'Internal server error', details: err.message });
});

app.listen(PORT, () => {
  logger.info({ port: PORT, mode: IS_PRODUCTION ? 'production' : 'development' }, 'Server listening');
});