'use strict';

// #73: shared content-ingest core. Extracted from routes/content.js POST / so the agency
// upload (routes/agency.js) produces BYTE-IDENTICAL first-class content (same thumbnail/
// dimensions/duration/insert) - an agency asset is indistinguishable from a dashboard
// upload. routes/content.js POST / is now a thin caller; behavior is unchanged (its
// existing tests are the regression guard).

const path = require('path');
const { v4: uuidv4 } = require('uuid');
const { db } = require('../db/database');
const config = require('../config');
const { sanitizeString } = require('../middleware/sanitize');
const { videoDisplayDims, imageDisplayDims } = require('./media-orientation');
const { finalizeUpload } = require('./upload-sniff');

// Multer takes file.originalname from the multipart header, bypassing sanitizeBody, so
// HTML-escape here (renders as text in every UI sink). .normalize('NFC') first: macOS
// sends NFD-decomposed names; Linux/renderers expect NFC. Single point - every filename
// storage site flows through here.
function safeFilename(name) {
  return sanitizeString((name || '').normalize('NFC'));
}

/*
 * Everything we can learn from the BYTES: thumbnail, display dimensions, duration.
 *
 * Extracted so PUT /api/content/:id/replace derives them the same way an upload does. It used
 * to carry its own shorter copy that handled images only — so replacing a video wiped the row's
 * duration, dimensions and thumbnail, and replacing a portrait photo re-introduced the EXIF
 * orientation bug (#170) that the ingest path fixes with imageDisplayDims + .rotate(). A second
 * copy of this logic is a second place for it to rot; there is now one.
 *
 * Best-effort by contract: a missing ffprobe or a sharp failure yields nulls and a warning, never
 * a throw — the file itself is already stored and is worth more than its metadata.
 *
 * @returns {{width:number|null, height:number|null, durationSec:number|null, thumbnailPath:string|null}}
 */
async function deriveMediaMetadata(sourcePath, filepath, mime) {
  let width = null, height = null, durationSec = null, thumbnailPath = null;
  try {
    // SVG is deliberately NOT handed to sharp: rasterising it goes through librsvg, which
    // is where the outstanding libvips CVEs live, and an SVG is already its own thumbnail.
    if (mime === 'image/svg+xml') {
      thumbnailPath = filepath;
    } else if (mime.startsWith('image/')) {
      const sharp = require('sharp');
      const metadata = await sharp(sourcePath).metadata();
      // #170: honor EXIF orientation so a portrait photo isn't stored as landscape.
      ({ width, height } = imageDisplayDims(metadata));
      // Assign thumbnailPath only AFTER the write succeeds: a sharp failure used to
      // return the already-assigned name for a file that was never written, storing a
      // phantom thumbnail_path that the UI then requests forever as a broken image.
      const thumbName = `thumb_${filepath}`;
      await sharp(sourcePath)
        .rotate() // #170: auto-orient per EXIF (and strip the tag) so the thumbnail matches
        .resize(config.thumbnailWidth)
        .jpeg({ quality: 70 })
        .toFile(path.join(config.contentDir, thumbName));
      thumbnailPath = thumbName;
    } else if (mime.startsWith('video/')) {
      try {
        const { execFileSync } = require('child_process');
        const probe = execFileSync('ffprobe', ['-v', 'quiet', '-print_format', 'json', '-show_format', '-show_streams', sourcePath],
          { timeout: 15000 }
        ).toString();
        const info = JSON.parse(probe);
        if (info.format?.duration) durationSec = parseFloat(info.format.duration);
        const videoStream = info.streams?.find(s => s.codec_type === 'video');
        if (videoStream) {
          // #170: honor the rotation/Display-Matrix so a portrait video isn't stored landscape.
          // (ffmpeg auto-rotates the thumbnail below by default, so only the dims need fixing.)
          ({ width, height } = videoDisplayDims(videoStream));
        }
        thumbnailPath = `thumb_${filepath.replace(/\.[^.]+$/, '.jpg')}`;
        try {
          execFileSync('ffmpeg', ['-y', '-i', sourcePath, '-ss', '2', '-vframes', '1', '-vf', `scale=${config.thumbnailWidth}:-1`, path.join(config.contentDir, thumbnailPath)],
            { timeout: 15000 }
          );
        } catch { thumbnailPath = null; }
      } catch (e) {
        console.warn('ffprobe failed:', e.message);
      }
    }
  } catch (e) {
    console.warn('Thumbnail/metadata generation failed:', e.message);
  }
  return { width, height, durationSec, thumbnailPath };
}

// Process a multer-uploaded file (thumbnail + dimensions + duration) and insert a content
// row. Returns the content row. Throws on a hard failure (the caller maps to 500);
// thumbnail/metadata failures are best-effort (logged, non-fatal) exactly as before.
async function ingestUploadedFile({ file, userId, workspaceId, folderId = null }) {
  const id = uuidv4();
  // Content-derived extension + mime. Throws UnsupportedUploadError (and removes the temp
  // file) when the bytes are not a supported media type; the caller maps that to a 400.
  const { filepath, mime } = finalizeUpload(file);
  const { width, height, durationSec, thumbnailPath } = await deriveMediaMetadata(file.path, filepath, mime);

  db.prepare(`
    INSERT INTO content (id, user_id, workspace_id, filename, filepath, mime_type, file_size, duration_sec, thumbnail_path, width, height, folder_id)
    VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?)
  `).run(id, userId, workspaceId, safeFilename(file.originalname), filepath, mime, file.size, durationSec, thumbnailPath, width, height, folderId || null);

  return db.prepare('SELECT * FROM content WHERE id = ?').get(id);
}

module.exports = { ingestUploadedFile, safeFilename, deriveMediaMetadata };