import fs from 'fs-extra';
import path from 'path';
import https from 'https';
import inquirer from 'inquirer';
import { fileURLToPath } from 'url';
import { loadConfig } from './config.js';
import { sanitizeMediaString } from './sanitize.js';

const __dirname = path.dirname(fileURLToPath(import.meta.url));
const downloadImage = (url, dest) => new Promise((resolve, reject) => {
  const file = fs.createWriteStream(dest);

  https.get(url, response => {
    if (response.statusCode !== 200) return reject(new Error(`Failed to download. Status: ${response.statusCode}`));

    response.pipe(file);
    file.on('finish', () => file.close(resolve));
  }).on('error', reject);
});
const isValidTMDBUrl = (val) => /^https:\/\/image\.tmdb\.org\/t\/p\//.test(val) || '❌ Must be a valid TMDB image url';
const overwriteImageDownloadPrompt = async (url, finalPath, fileName) => {
  await fs.ensureDir(path.dirname(finalPath));

  if (await fs.pathExists(finalPath)) {
    const { overwrite } = await inquirer.prompt({
      type: 'confirm',
      name: 'overwrite',
      message: `${fileName} already exists. Overwrite?`,
      default: false
    });

    if (!overwrite) {
      console.log(`⚠️ Skipped existing file: ${fileName}`);

      return;
    }
  }

  await downloadImage(url, finalPath);

  console.log(`✅ Saved to: ${finalPath}`);
};

export const downloadWatchingImages = async () => {
  const config = await loadConfig();
  const { mediaType } = await inquirer.prompt({
    type: 'list',
    name: 'mediaType',
    message: 'Movie or a show?',
    choices: Object.keys(config.mediaPaths)
  });
  const { tmdbId } = await inquirer.prompt({
    name: 'tmdbId',
    message: 'Enter the TMDB ID:'
  });

  if (!tmdbId) {
    console.warn('⚠️ TMDB ID is required.');

    return;
  }

  const { posterUrl, backdropUrl } = await inquirer.prompt([{
    name: 'posterUrl',
    message: 'Enter the poster url:',
    validate: (val) => {
      if (!val) return true;

      return isValidTMDBUrl(val);
    }
  },
  {
    name: 'backdropUrl',
    message: 'Enter the backdrop url:',
    validate: (val) => {
      if (!val) return true;

      return isValidTMDBUrl(val);
    }
  }]);
  const types = [{ type: 'poster', url: posterUrl }, { type: 'backdrop', url: backdropUrl }];

  for (const { type, url } of types) {
    if (!url) continue;

    const ext = path.extname(new URL(url).pathname) || '.jpg';
    const fileName = `${type}-${tmdbId}${ext}`;
    const targetSubPath = config.mediaPaths[mediaType][type];

    if (!targetSubPath) {
      console.error(`❌ Missing path for ${mediaType}/${type}. Check your config.`);

      continue;
    }

    const targetDir = path.join(config.storageDir, targetSubPath);
    const finalPath = path.join(targetDir, fileName);

    await overwriteImageDownloadPrompt(url, finalPath, fileName);
  }
}

export const downloadArtistImage = async () => {
  const config = await loadConfig();
  const { artistName } = await inquirer.prompt({
    name: 'artistName',
    message: 'Enter the artist name:'
  });

  if (!artistName) {
    console.warn('⚠️ Artist name is required.');

    return;
  }

  const { imageUrl } = await inquirer.prompt({
    name: 'imageUrl',
    message: 'Enter the artist image url:',
    validate: (val) => {
      try {
        new URL(val);

        return true;
      } catch {
        return '❌ Must be a valid url.';
      }
    }
  });

  const sanitizedName = sanitizeMediaString(artistName);
  const ext = path.extname(new URL(imageUrl).pathname) || '.jpg';
  const fileName = `${sanitizedName}${ext}`;
  const targetDir = path.join(config.storageDir, 'artists');
  const finalPath = path.join(targetDir, fileName);

  await overwriteImageDownloadPrompt(imageUrl, finalPath, fileName);
}

export const downloadAlbumImage = async () => {
  const config = await loadConfig();

  const { artistName } = await inquirer.prompt({
    name: 'artistName',
    message: 'Enter the artist name:'
  });

  if (!artistName) {
    console.warn('⚠️ Artist name is required.');

    return;
  }

  const { albumName } = await inquirer.prompt({
    name: 'albumName',
    message: 'Enter the album name:'
  });

  if (!albumName) {
    console.warn('⚠️ Album name is required.');

    return;
  }

  const { imageUrl } = await inquirer.prompt({
    name: 'imageUrl',
    message: 'Enter the album image url:',
    validate: (val) => {
      try {
        new URL(val);

        return true;
      } catch {
        return '❌ Must be a valid url.';
      }
    }
  });

  const artistSlug = sanitizeMediaString(artistName);
  const albumSlug = sanitizeMediaString(albumName);
  const ext = path.extname(new URL(imageUrl).pathname) || '.jpg';
  const fileName = `${artistSlug}-${albumSlug}${ext}`;
  const targetDir = path.join(config.storageDir, config.albumPath);
  const finalPath = path.join(targetDir, fileName);

  await overwriteImageDownloadPrompt(imageUrl, finalPath, fileName);
};

export const downloadBookImage = async () => {
  const config = await loadConfig();
  const { isbn } = await inquirer.prompt({
    name: 'isbn',
    message: 'Enter the ISBN (no spaces):',
    validate: (val) => /^[a-zA-Z0-9-]+$/.test(val) || 'ISBN must contain only letters, numbers, or hyphens'
  });
  const { bookTitle } = await inquirer.prompt({
    name: 'bookTitle',
    message: 'Enter the book title:'
  });

  if (!bookTitle) {
    console.warn('⚠️ Book title is required.');

    return;
  }

  const { imageUrl } = await inquirer.prompt({
    name: 'imageUrl',
    message: 'Enter the book cover image URL:',
    validate: (val) => {
      try {
        new URL(val);

        return true;
      } catch {
        return 'Must be a valid URL';
      }
    }
  });
  const titleSlug = sanitizeMediaString(bookTitle);
  const ext = path.extname(new URL(imageUrl).pathname) || '.jpg';
  const fileName = `${isbn}-${titleSlug}${ext}`;
  const targetDir = path.join(config.storageDir, config.bookPath);
  const finalPath = path.join(targetDir, fileName);

  await overwriteImageDownloadPrompt(imageUrl, finalPath, fileName);
}


export const downloadAsset = async () => {
  const { type } = await inquirer.prompt({
    type: 'list',
    name: 'type',
    message: 'What type of asset are you downloading?',
    choices: ['movie/show', 'artist', 'album', 'book']
  });

  if (type === 'artist') {
    await downloadArtistImage();
  } else if (type === 'album') {
    await downloadAlbumImage();
  } else if (type === 'book') {
    await downloadBookImage();
  } else {
    await downloadWatchingImages();
  }
}