import {
  uploadAlbumCover,
  deleteAlbumCover,
  uploadAlbumPhoto,
  deleteAlbumPhoto,
  uploadAlbumVideo,
  deleteAlbumVideo,
} from '../../services/image.js';

/**
 * 앨범 관리 라우트
 */
export default async function albumsRoutes(fastify, opts) {
  const { db } = fastify;

  // ==================== 앨범 CRUD ====================

  /**
   * 앨범 목록 조회 (트랙 포함)
   * GET /api/admin/albums
   */
  fastify.get('/', async (request, reply) => {
    const [albums] = await db.query(`
      SELECT id, title, folder_name, album_type, album_type_short, release_date,
             cover_original_url, cover_medium_url, cover_thumb_url, description
      FROM albums
      ORDER BY release_date DESC
    `);

    // 각 앨범에 트랙 정보 추가
    for (const album of albums) {
      const [tracks] = await db.query(
        `SELECT id, track_number, title, is_title_track, duration
         FROM tracks WHERE album_id = ? ORDER BY track_number`,
        [album.id]
      );
      album.tracks = tracks;
    }

    return albums;
  });

  /**
   * 앨범 상세 조회
   * GET /api/admin/albums/:id
   */
  fastify.get('/:id', async (request, reply) => {
    const { id } = request.params;

    const [albums] = await db.query('SELECT * FROM albums WHERE id = ?', [id]);
    if (albums.length === 0) {
      return reply.code(404).send({ error: '앨범을 찾을 수 없습니다.' });
    }

    const album = albums[0];

    // 트랙 정보 조회
    const [tracks] = await db.query(
      `SELECT * FROM tracks WHERE album_id = ? ORDER BY track_number`,
      [id]
    );
    album.tracks = tracks;

    return album;
  });

  /**
   * 앨범 생성
   * POST /api/admin/albums
   */
  fastify.post('/', async (request, reply) => {
    const parts = request.parts();
    let data = null;
    let coverBuffer = null;

    for await (const part of parts) {
      if (part.type === 'file' && part.fieldname === 'cover') {
        coverBuffer = await part.toBuffer();
      } else if (part.fieldname === 'data') {
        data = JSON.parse(part.value);
      }
    }

    if (!data) {
      return reply.code(400).send({ error: '데이터가 필요합니다.' });
    }

    const {
      title,
      album_type,
      album_type_short,
      release_date,
      folder_name,
      description,
      tracks,
    } = data;

    // 필수 필드 검증
    if (!title || !album_type || !release_date || !folder_name) {
      return reply.code(400).send({ error: '필수 필드를 모두 입력해주세요.' });
    }

    const connection = await db.getConnection();

    try {
      await connection.beginTransaction();

      let coverOriginalUrl = null;
      let coverMediumUrl = null;
      let coverThumbUrl = null;

      // 커버 이미지 업로드
      if (coverBuffer) {
        const urls = await uploadAlbumCover(folder_name, coverBuffer);
        coverOriginalUrl = urls.originalUrl;
        coverMediumUrl = urls.mediumUrl;
        coverThumbUrl = urls.thumbUrl;
      }

      // 앨범 삽입
      const [albumResult] = await connection.query(
        `INSERT INTO albums (title, album_type, album_type_short, release_date, folder_name,
                             cover_original_url, cover_medium_url, cover_thumb_url, description)
         VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?)`,
        [
          title,
          album_type,
          album_type_short || null,
          release_date,
          folder_name,
          coverOriginalUrl,
          coverMediumUrl,
          coverThumbUrl,
          description || null,
        ]
      );

      const albumId = albumResult.insertId;

      // 트랙 삽입
      if (tracks && tracks.length > 0) {
        for (const track of tracks) {
          await connection.query(
            `INSERT INTO tracks (album_id, track_number, title, duration, is_title_track,
                                 lyricist, composer, arranger, lyrics, music_video_url)
             VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?)`,
            [
              albumId,
              track.track_number,
              track.title,
              track.duration || null,
              track.is_title_track ? 1 : 0,
              track.lyricist || null,
              track.composer || null,
              track.arranger || null,
              track.lyrics || null,
              track.music_video_url || null,
            ]
          );
        }
      }

      await connection.commit();

      return { message: '앨범이 생성되었습니다.', albumId };
    } catch (error) {
      await connection.rollback();
      throw error;
    } finally {
      connection.release();
    }
  });

  /**
   * 앨범 수정
   * PUT /api/admin/albums/:id
   */
  fastify.put('/:id', async (request, reply) => {
    const { id } = request.params;
    const parts = request.parts();
    let data = null;
    let coverBuffer = null;

    for await (const part of parts) {
      if (part.type === 'file' && part.fieldname === 'cover') {
        coverBuffer = await part.toBuffer();
      } else if (part.fieldname === 'data') {
        data = JSON.parse(part.value);
      }
    }

    if (!data) {
      return reply.code(400).send({ error: '데이터가 필요합니다.' });
    }

    const {
      title,
      album_type,
      album_type_short,
      release_date,
      folder_name,
      description,
      tracks,
    } = data;

    const connection = await db.getConnection();

    try {
      await connection.beginTransaction();

      // 기존 앨범 조회
      const [existingAlbums] = await connection.query(
        'SELECT * FROM albums WHERE id = ?',
        [id]
      );
      if (existingAlbums.length === 0) {
        return reply.code(404).send({ error: '앨범을 찾을 수 없습니다.' });
      }

      const existing = existingAlbums[0];
      let coverOriginalUrl = existing.cover_original_url;
      let coverMediumUrl = existing.cover_medium_url;
      let coverThumbUrl = existing.cover_thumb_url;

      // 새 커버 이미지 업로드
      if (coverBuffer) {
        const urls = await uploadAlbumCover(folder_name, coverBuffer);
        coverOriginalUrl = urls.originalUrl;
        coverMediumUrl = urls.mediumUrl;
        coverThumbUrl = urls.thumbUrl;
      }

      // 앨범 업데이트
      await connection.query(
        `UPDATE albums SET title = ?, album_type = ?, album_type_short = ?, release_date = ?,
                          folder_name = ?, cover_original_url = ?, cover_medium_url = ?,
                          cover_thumb_url = ?, description = ?
         WHERE id = ?`,
        [
          title,
          album_type,
          album_type_short || null,
          release_date,
          folder_name,
          coverOriginalUrl,
          coverMediumUrl,
          coverThumbUrl,
          description || null,
          id,
        ]
      );

      // 기존 트랙 삭제 후 새 트랙 삽입
      await connection.query('DELETE FROM tracks WHERE album_id = ?', [id]);

      if (tracks && tracks.length > 0) {
        for (const track of tracks) {
          await connection.query(
            `INSERT INTO tracks (album_id, track_number, title, duration, is_title_track,
                                 lyricist, composer, arranger, lyrics, music_video_url)
             VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?)`,
            [
              id,
              track.track_number,
              track.title,
              track.duration || null,
              track.is_title_track ? 1 : 0,
              track.lyricist || null,
              track.composer || null,
              track.arranger || null,
              track.lyrics || null,
              track.music_video_url || null,
            ]
          );
        }
      }

      await connection.commit();

      return { message: '앨범이 수정되었습니다.' };
    } catch (error) {
      await connection.rollback();
      throw error;
    } finally {
      connection.release();
    }
  });

  /**
   * 앨범 삭제
   * DELETE /api/admin/albums/:id
   */
  fastify.delete('/:id', async (request, reply) => {
    const { id } = request.params;

    const connection = await db.getConnection();

    try {
      await connection.beginTransaction();

      // 기존 앨범 조회
      const [existingAlbums] = await connection.query(
        'SELECT * FROM albums WHERE id = ?',
        [id]
      );
      if (existingAlbums.length === 0) {
        return reply.code(404).send({ error: '앨범을 찾을 수 없습니다.' });
      }

      const album = existingAlbums[0];

      // S3에서 커버 이미지 삭제
      if (album.cover_original_url && album.folder_name) {
        await deleteAlbumCover(album.folder_name);
      }

      // 트랙 삭제
      await connection.query('DELETE FROM tracks WHERE album_id = ?', [id]);

      // 앨범 삭제
      await connection.query('DELETE FROM albums WHERE id = ?', [id]);

      await connection.commit();

      return { message: '앨범이 삭제되었습니다.' };
    } catch (error) {
      await connection.rollback();
      throw error;
    } finally {
      connection.release();
    }
  });

  // ==================== 앨범 사진 관리 ====================

  /**
   * 앨범 사진 목록 조회
   * GET /api/admin/albums/:albumId/photos
   */
  fastify.get('/:albumId/photos', async (request, reply) => {
    const { albumId } = request.params;

    // 앨범 존재 확인
    const [albums] = await db.query(
      'SELECT folder_name FROM albums WHERE id = ?',
      [albumId]
    );
    if (albums.length === 0) {
      return reply.code(404).send({ error: '앨범을 찾을 수 없습니다.' });
    }

    // 사진 조회 (멤버 정보 포함)
    const [photos] = await db.query(
      `SELECT
        p.id, p.original_url, p.medium_url, p.thumb_url, p.photo_type, p.concept_name,
        p.sort_order, p.width, p.height, p.file_size,
        GROUP_CONCAT(pm.member_id) as member_ids
      FROM album_photos p
      LEFT JOIN album_photo_members pm ON p.id = pm.photo_id
      WHERE p.album_id = ?
      GROUP BY p.id
      ORDER BY p.sort_order ASC`,
      [albumId]
    );

    // 멤버 배열 파싱
    return photos.map((photo) => ({
      ...photo,
      members: photo.member_ids ? photo.member_ids.split(',').map(Number) : [],
    }));
  });

  /**
   * 앨범 티저 목록 조회
   * GET /api/admin/albums/:albumId/teasers
   */
  fastify.get('/:albumId/teasers', async (request, reply) => {
    const { albumId } = request.params;

    // 앨범 존재 확인
    const [albums] = await db.query(
      'SELECT folder_name FROM albums WHERE id = ?',
      [albumId]
    );
    if (albums.length === 0) {
      return reply.code(404).send({ error: '앨범을 찾을 수 없습니다.' });
    }

    // 티저 조회
    const [teasers] = await db.query(
      `SELECT id, original_url, medium_url, thumb_url, video_url, sort_order, media_type
       FROM album_teasers
       WHERE album_id = ?
       ORDER BY sort_order ASC`,
      [albumId]
    );

    return teasers;
  });

  /**
   * 앨범 사진 업로드 (SSE)
   * POST /api/admin/albums/:albumId/photos
   */
  fastify.post('/:albumId/photos', async (request, reply) => {
    const { albumId } = request.params;

    // SSE 헤더 설정
    reply.raw.writeHead(200, {
      'Content-Type': 'text/event-stream',
      'Cache-Control': 'no-cache',
      'Connection': 'keep-alive',
    });

    const sendProgress = (current, total, message) => {
      reply.raw.write(`data: ${JSON.stringify({ current, total, message })}\n\n`);
    };

    const connection = await db.getConnection();

    try {
      await connection.beginTransaction();

      // 앨범 정보 조회
      const [albums] = await connection.query(
        'SELECT folder_name FROM albums WHERE id = ?',
        [albumId]
      );
      if (albums.length === 0) {
        reply.raw.write(`data: ${JSON.stringify({ error: '앨범을 찾을 수 없습니다.' })}\n\n`);
        reply.raw.end();
        return;
      }

      const folderName = albums[0].folder_name;
      const parts = request.parts();

      let metadata = [];
      let startNumber = null;
      let photoType = 'concept';
      const files = [];

      for await (const part of parts) {
        if (part.type === 'file' && part.fieldname === 'photos') {
          const buffer = await part.toBuffer();
          files.push({ buffer, mimetype: part.mimetype });
        } else if (part.fieldname === 'metadata') {
          metadata = JSON.parse(part.value);
        } else if (part.fieldname === 'startNumber') {
          startNumber = parseInt(part.value) || null;
        } else if (part.fieldname === 'photoType') {
          photoType = part.value;
        }
      }

      // 시작 번호 결정
      let nextOrder;
      if (startNumber && startNumber > 0) {
        nextOrder = startNumber;
      } else {
        const [existingPhotos] = await connection.query(
          'SELECT MAX(sort_order) as maxOrder FROM album_photos WHERE album_id = ?',
          [albumId]
        );
        nextOrder = (existingPhotos[0].maxOrder || 0) + 1;
      }

      const uploadedPhotos = [];
      const totalFiles = files.length;
      const subFolder = photoType === 'teaser' ? 'teaser' : 'photo';

      for (let i = 0; i < files.length; i++) {
        const file = files[i];
        const meta = metadata[i] || {};
        const orderNum = String(nextOrder + i).padStart(2, '0');
        const isVideo = file.mimetype === 'video/mp4';
        const filename = `${orderNum}.${isVideo ? 'mp4' : 'webp'}`;

        sendProgress(i + 1, totalFiles, `${filename} 처리 중...`);

        let originalUrl, mediumUrl, thumbUrl, videoUrl;
        let photoMetadata = {};

        if (isVideo) {
          // 비디오 파일은 별도 처리 필요 (썸네일 생성 등)
          // 현재는 간단히 업로드만
          videoUrl = await uploadAlbumVideo(folderName, filename, file.buffer);
          // 썸네일 없이 일단 저장
          originalUrl = videoUrl;
          mediumUrl = videoUrl;
          thumbUrl = videoUrl;
        } else {
          // 이미지 파일 처리
          const result = await uploadAlbumPhoto(folderName, subFolder, filename, file.buffer);
          originalUrl = result.originalUrl;
          mediumUrl = result.mediumUrl;
          thumbUrl = result.thumbUrl;
          photoMetadata = result.metadata;
        }

        let photoId;

        if (photoType === 'teaser') {
          // 티저 → album_teasers 테이블
          const mediaType = isVideo ? 'video' : 'image';
          const [result] = await connection.query(
            `INSERT INTO album_teasers
             (album_id, original_url, medium_url, thumb_url, video_url, sort_order, media_type)
             VALUES (?, ?, ?, ?, ?, ?, ?)`,
            [albumId, originalUrl, mediumUrl, thumbUrl, videoUrl || null, nextOrder + i, mediaType]
          );
          photoId = result.insertId;
        } else {
          // 컨셉 포토 → album_photos 테이블
          const [result] = await connection.query(
            `INSERT INTO album_photos
             (album_id, original_url, medium_url, thumb_url, photo_type, concept_name, sort_order, width, height, file_size)
             VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?)`,
            [
              albumId,
              originalUrl,
              mediumUrl,
              thumbUrl,
              meta.groupType || 'group',
              meta.conceptName || null,
              nextOrder + i,
              photoMetadata.width || null,
              photoMetadata.height || null,
              photoMetadata.size || null,
            ]
          );
          photoId = result.insertId;

          // 멤버 태깅 저장
          if (meta.members && meta.members.length > 0) {
            for (const memberId of meta.members) {
              await connection.query(
                'INSERT INTO album_photo_members (photo_id, member_id) VALUES (?, ?)',
                [photoId, memberId]
              );
            }
          }
        }

        uploadedPhotos.push({
          id: photoId,
          original_url: originalUrl,
          medium_url: mediumUrl,
          thumb_url: thumbUrl,
          video_url: videoUrl || null,
          filename,
          media_type: isVideo ? 'video' : 'image',
        });
      }

      await connection.commit();

      // 완료 이벤트
      reply.raw.write(`data: ${JSON.stringify({
        done: true,
        message: `${uploadedPhotos.length}개의 사진이 업로드되었습니다.`,
        photos: uploadedPhotos,
      })}\n\n`);
      reply.raw.end();
    } catch (error) {
      await connection.rollback();
      console.error('사진 업로드 오류:', error);
      reply.raw.write(`data: ${JSON.stringify({ error: '사진 업로드 중 오류가 발생했습니다.' })}\n\n`);
      reply.raw.end();
    } finally {
      connection.release();
    }
  });

  /**
   * 앨범 사진 삭제
   * DELETE /api/admin/albums/:albumId/photos/:photoId
   */
  fastify.delete('/:albumId/photos/:photoId', async (request, reply) => {
    const { albumId, photoId } = request.params;

    const connection = await db.getConnection();

    try {
      await connection.beginTransaction();

      // 사진 정보 조회
      const [photos] = await connection.query(
        `SELECT p.*, a.folder_name
         FROM album_photos p
         JOIN albums a ON p.album_id = a.id
         WHERE p.id = ? AND p.album_id = ?`,
        [photoId, albumId]
      );

      if (photos.length === 0) {
        return reply.code(404).send({ error: '사진을 찾을 수 없습니다.' });
      }

      const photo = photos[0];
      const filename = photo.original_url.split('/').pop();

      // S3에서 삭제
      await deleteAlbumPhoto(photo.folder_name, 'photo', filename);

      // 멤버 태깅 삭제
      await connection.query('DELETE FROM album_photo_members WHERE photo_id = ?', [photoId]);

      // 사진 삭제
      await connection.query('DELETE FROM album_photos WHERE id = ?', [photoId]);

      await connection.commit();

      return { message: '사진이 삭제되었습니다.' };
    } catch (error) {
      await connection.rollback();
      throw error;
    } finally {
      connection.release();
    }
  });

  /**
   * 티저 삭제
   * DELETE /api/admin/albums/:albumId/teasers/:teaserId
   */
  fastify.delete('/:albumId/teasers/:teaserId', async (request, reply) => {
    const { albumId, teaserId } = request.params;

    const connection = await db.getConnection();

    try {
      await connection.beginTransaction();

      // 티저 정보 조회
      const [teasers] = await connection.query(
        `SELECT t.*, a.folder_name
         FROM album_teasers t
         JOIN albums a ON t.album_id = a.id
         WHERE t.id = ? AND t.album_id = ?`,
        [teaserId, albumId]
      );

      if (teasers.length === 0) {
        return reply.code(404).send({ error: '티저를 찾을 수 없습니다.' });
      }

      const teaser = teasers[0];
      const filename = teaser.original_url.split('/').pop();

      // S3에서 썸네일 삭제
      await deleteAlbumPhoto(teaser.folder_name, 'teaser', filename);

      // 비디오 파일 삭제
      if (teaser.video_url) {
        const videoFilename = teaser.video_url.split('/').pop();
        await deleteAlbumVideo(teaser.folder_name, videoFilename);
      }

      // 티저 삭제
      await connection.query('DELETE FROM album_teasers WHERE id = ?', [teaserId]);

      await connection.commit();

      return { message: '티저가 삭제되었습니다.' };
    } catch (error) {
      await connection.rollback();
      throw error;
    } finally {
      connection.release();
    }
  });
}