/**
 * Generate timeline portrait thumbnails from existing full portraits.
 * Writes portraits/thumbs/{Artist}_thumb.jpg and updates portrait_thumb_path.
 */
require('dotenv').config();
const fs = require('fs');
const path = require('path');
const pool = require('../server/db');
const { generateThumbnailFromFull } = require('./image-fetcher');
const { printCliResult } = require('./lib/cli-result');

const IMAGE_DIR = path.resolve(process.env.IMAGE_DIR || './data/images');
const PORTRAIT_THUMB_WIDTH = 256;

function safeArtistPortraitBase(artistName) {
  return artistName.replace(/[^a-zA-Z0-9_-]/g, '_');
}

function localPath(rel) {
  return path.join(IMAGE_DIR, rel);
}

async function generatePortraitThumb(row) {
  if (!row.portrait_path) return { skipped: true, reason: 'no portrait' };

  const fullPath = localPath(row.portrait_path);
  if (!fs.existsSync(fullPath)) return { skipped: true, reason: 'missing file' };

  const safeBase = safeArtistPortraitBase(row.name);
  const thumbsDir = path.join(IMAGE_DIR, 'portraits', 'thumbs');
  if (!fs.existsSync(thumbsDir)) fs.mkdirSync(thumbsDir, { recursive: true });

  const thumbDest = path.join(thumbsDir, `${safeBase}_thumb.jpg`);
  await generateThumbnailFromFull(fullPath, thumbDest, PORTRAIT_THUMB_WIDTH);
  const portraitThumbPath = path.join('portraits', 'thumbs', `${safeBase}_thumb.jpg`).replace(/\\/g, '/');

  await pool.query(`UPDATE artists SET portrait_thumb_path = $1 WHERE id = $2`, [
    portraitThumbPath,
    row.id,
  ]);

  return { skipped: false, portraitThumbPath };
}

(async () => {
  const { rows } = await pool.query(
    `SELECT id, name, portrait_path, portrait_thumb_path FROM artists
     WHERE portrait_path IS NOT NULL AND portrait_path <> ''
     ORDER BY id`
  );

  let generated = 0;
  let skipped = 0;
  const errors = [];

  for (const row of rows) {
    try {
      const result = await generatePortraitThumb(row);
      if (result.skipped) skipped++;
      else generated++;
    } catch (err) {
      errors.push({ id: row.id, name: row.name, error: err.message });
    }
  }

  console.log(`Portrait thumbs: ${generated} generated, ${skipped} skipped, ${errors.length} errors`);
  if (errors.length) {
    for (const e of errors.slice(0, 20)) {
      console.warn(`  #${e.id} ${e.name}: ${e.error}`);
    }
  }

  await pool.end();

  if (errors.length) {
    printCliResult({
      script: 'regenerate-portrait-thumbs',
      ok: false,
      summary: `Portrait thumbnail regeneration finished with ${errors.length} error(s).`,
      details: [
        `Generated: ${generated}, skipped: ${skipped}`,
        ...errors.slice(0, 5).map((e) => `  #${e.id} ${e.name}: ${e.error}`),
      ],
    });
  }

  printCliResult({
    script: 'regenerate-portrait-thumbs',
    ok: true,
    summary: 'Portrait thumbnail regeneration complete.',
    details: [`Generated: ${generated}, skipped: ${skipped}`],
  });
})().catch((err) => {
  console.error(err);
  pool.end().finally(() => {
    printCliResult({
      script: 'regenerate-portrait-thumbs',
      ok: false,
      summary: err.message || String(err),
    });
  });
});