#!/usr/bin/env node
/**
 * fix_images.js
 * Finds broken image URLs in lexicon/catalog files and replaces them
 * using Wikimedia Commons API.
 */

const fs = require('fs');
const https = require('https');

const FILES = [
  'constants/lexiconBatch1.ts',
  'constants/lexiconBatch2.ts',
  'services/backend/mockCatalog.ts',
];

// Known manual fixes (botanicalName -> correct Wikimedia filename)
const MANUAL_FIXES = {
  'Chlorophytum comosum': 'Chlorophytum_comosum_01.jpg',
  'Syngonium podophyllum': 'Syngonium_podophyllum1.jpg',
  'Fuchsia hybrida': 'Fuchsia_%27Beacon%27.jpg',
  'Tillandsia usneoides': 'Tillandsia_usneoides_leaves.jpg',
  'Tillandsia ionantha': 'Tillandsia_ionantha0.jpg',
};

function sleep(ms) {
  return new Promise(resolve => setTimeout(resolve, ms));
}

function httpGet(url) {
  return new Promise((resolve, reject) => {
    const req = https.get(url, {
      headers: {
        'User-Agent': 'GreenLens-ImageFixer/1.0 (educational plant app)'
      }
    }, (res) => {
      if (res.statusCode === 301 || res.statusCode === 302) {
        resolve(httpGet(res.headers.location));
        return;
      }
      let data = '';
      res.on('data', chunk => data += chunk);
      res.on('end', () => resolve({ status: res.statusCode, body: data }));
    });
    req.on('error', reject);
    req.setTimeout(10000, () => {
      req.destroy();
      reject(new Error('timeout'));
    });
  });
}

function checkUrl(url) {
  return new Promise((resolve) => {
    const req = https.get(url, {
      headers: { 'User-Agent': 'GreenLens-ImageFixer/1.0' }
    }, (res) => {
      res.resume();
      resolve(res.statusCode === 200);
    });
    req.on('error', () => resolve(false));
    req.setTimeout(8000, () => { req.destroy(); resolve(false); });
  });
}

async function searchWikimediaImage(botanicalName) {
  const encoded = encodeURIComponent(botanicalName);
  const url = `https://commons.wikimedia.org/w/api.php?action=query&generator=search&gsrnamespace=6&gsrsearch=${encoded}&gsrlimit=5&prop=imageinfo&iiprop=url&iiurlwidth=500&format=json`;

  try {
    const res = await httpGet(url);
    if (res.status !== 200) return null;
    const data = JSON.parse(res.body);
    const pages = data.query && data.query.pages;
    if (!pages) return null;

    for (const page of Object.values(pages)) {
      const info = page.imageinfo && page.imageinfo[0];
      if (!info) continue;
      const thumbUrl = info.thumburl || info.url;
      if (thumbUrl && (thumbUrl.endsWith('.jpg') || thumbUrl.endsWith('.png') || thumbUrl.endsWith('.JPG') || thumbUrl.endsWith('.PNG'))) {
        return thumbUrl;
      }
    }
  } catch (e) {
    console.error(`  API error for "${botanicalName}": ${e.message}`);
  }
  return null;
}

function wikimediaThumbUrl(filename) {
  // Build a 500px thumb URL from a bare filename
  const name = filename.replace(/ /g, '_');
  const hash = require('crypto').createHash('md5').update(name).digest('hex');
  const d1 = hash[0];
  const d2 = hash.substring(0, 2);
  const ext = name.split('.').pop().toLowerCase();
  const isJpg = ['jpg', 'jpeg'].includes(ext);
  return `https://upload.wikimedia.org/wikipedia/commons/thumb/${d1}/${d2}/${name}/500px-${name}`;
}

function parseEntries(content) {
  // Match blocks: find name, botanicalName, imageUri
  const entries = [];
  const regex = /name:\s*['"]([^'"]+)['"]\s*,[\s\S]*?botanicalName:\s*['"]([^'"]+)['"]\s*,[\s\S]*?imageUri:\s*['"]([^'"]+)['"]/g;
  let m;
  while ((m = regex.exec(content)) !== null) {
    entries.push({
      name: m[1],
      botanicalName: m[2],
      imageUri: m[3],
      index: m.index,
    });
  }
  return entries;
}

async function processFile(filepath) {
  console.log(`\n=== Processing ${filepath} ===`);
  let content = fs.readFileSync(filepath, 'utf8');
  const entries = parseEntries(content);
  console.log(`Found ${entries.length} entries`);

  let fixCount = 0;

  for (const entry of entries) {
    const { name, botanicalName, imageUri } = entry;

    // Check if URL is broken
    process.stdout.write(`  Checking ${botanicalName}... `);
    const ok = await checkUrl(imageUri);
    if (ok) {
      console.log('OK');
      await sleep(100);
      continue;
    }
    console.log('BROKEN');

    let newUrl = null;

    // Check manual fixes first
    if (MANUAL_FIXES[botanicalName]) {
      const filename = MANUAL_FIXES[botanicalName];
      const thumb = wikimediaThumbUrl(filename);
      console.log(`  -> Manual fix: ${thumb}`);
      newUrl = thumb;
    } else {
      // Query Wikimedia Commons API
      console.log(`  -> Searching Wikimedia for "${botanicalName}"...`);
      newUrl = await searchWikimediaImage(botanicalName);
      if (newUrl) {
        console.log(`  -> Found: ${newUrl}`);
      } else {
        console.log(`  -> No result found, skipping`);
      }
    }

    if (newUrl) {
      // Replace the old URL in content (escape for regex)
      const escapedOld = imageUri.replace(/[.*+?^${}()|[\]\\]/g, '\\$&');
      content = content.replace(new RegExp(escapedOld, 'g'), newUrl);
      fixCount++;
    }

    await sleep(200);
  }

  if (fixCount > 0) {
    fs.writeFileSync(filepath, content, 'utf8');
    console.log(`  => Wrote ${fixCount} fixes to ${filepath}`);
  } else {
    console.log(`  => No changes needed`);
  }

  return fixCount;
}

async function main() {
  console.log('GreenLens Image URL Fixer');
  console.log('========================');
  let totalFixes = 0;
  for (const file of FILES) {
    if (!fs.existsSync(file)) {
      console.log(`\nSkipping ${file} (not found)`);
      continue;
    }
    totalFixes += await processFile(file);
  }
  console.log(`\nDone. Total fixes: ${totalFixes}`);
}

main().catch(console.error);