import { getDatabase } from './database'
import { Photo, Album, Tag, Directory, ImageHash, PhotoHash } from '@/types/photo'
import { randomUUID } from 'crypto'

export class PhotoService {
  private db = getDatabase()

  // Photo operations
  createPhoto(photoData: Omit<Photo, 'id' | 'indexed_at' | 'thumbnail_blob' | 'thumbnail_size' | 'thumbnail_generated_at'>): Photo {
    const id = randomUUID()
    const insertPhoto = this.db.prepare(`
      INSERT INTO photos (
        id, filename, filepath, directory, filesize, created_at, modified_at,
        width, height, format, favorite, rating, description, metadata
      ) VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?)
    `)

    try {
      // Sanitize each value to ensure it's a primitive type for SQLite
      const sanitizeValue = (value: any): string | number | boolean | null => {
        // Explicitly handle null and undefined
        if (value === null || value === undefined) return null
        // Handle primitive types
        if (typeof value === 'string') return value
        if (typeof value === 'number') return value
        if (typeof value === 'boolean') return value
        // Handle other types
        if (typeof value === 'bigint') return Number(value)
        if (value instanceof Date) return value.toISOString()
        if (typeof value === 'object') {
          // If it's null, return null (redundant but explicit)
          if (value === null) return null
          // Otherwise stringify the object
          return JSON.stringify(value)
        }
        // Convert everything else to string
        return String(value)
      }

      // Direct approach - build parameters with explicit type checking
      const params = [
        id, // string
        photoData.filename, // string
        photoData.filepath, // string
        photoData.directory, // string
        photoData.filesize, // number
        photoData.created_at, // string
        photoData.modified_at, // string
        photoData.width || null, // number or null
        photoData.height || null, // number or null  
        photoData.format || null, // string or null
        photoData.favorite === true ? 1 : 0, // convert boolean to integer
        null, // rating - always null for now
        null, // description - always null for now
        photoData.metadata || null // string or null
      ]
      
      // Debug: Log each parameter type before database insertion
      console.log(`[PHOTO SERVICE] Debug - checking SQL parameters for ${photoData.filename}:`)
      const fieldNames = ['id', 'filename', 'filepath', 'directory', 'filesize', 'created_at', 'modified_at', 'width', 'height', 'format', 'favorite', 'rating', 'description', 'metadata']
      params.forEach((value, index) => {
        const valueStr = value === null ? 'NULL' : (typeof value === 'string' && value.length > 50 ? value.substring(0, 50) + '...' : value)
        console.log(`  ${fieldNames[index]}:`, typeof value, valueStr)
        
        // Additional check for SQLite compatibility
        const isValidSQLiteValue = value === null || typeof value === 'string' || typeof value === 'number' || typeof value === 'bigint'
        if (!isValidSQLiteValue) {
          console.error(`    ❌ INVALID SQLite value for ${fieldNames[index]}:`, value, typeof value)
        }
      })

      // Use spread operator with the clean params array
      insertPhoto.run(...params)

      return this.getPhoto(id)!
    } catch (error) {
      console.error(`[PHOTO SERVICE] Error creating photo ${photoData.filename}:`, error)
      console.error(`[PHOTO SERVICE] Photo data:`, photoData)
      throw error
    }
  }

  getPhoto(id: string): Photo | null {
    const selectPhoto = this.db.prepare('SELECT * FROM photos WHERE id = ?')
    return selectPhoto.get(id) as Photo | null
  }

  getPhotoByPath(filepath: string): Photo | null {
    const selectPhoto = this.db.prepare('SELECT * FROM photos WHERE filepath = ?')
    return selectPhoto.get(filepath) as Photo | null
  }

  getPhotos(options: {
    directory?: string
    limit?: number
    offset?: number
    sortBy?: 'created_at' | 'modified_at' | 'filename' | 'filesize'
    sortOrder?: 'ASC' | 'DESC'
    favorite?: boolean
    rating?: number
  } = {}): Photo[] {
    let query = 'SELECT * FROM photos WHERE 1=1'
    const params: any[] = []

    if (options.directory) {
      query += ' AND directory = ?'
      params.push(options.directory)
    }

    if (options.favorite !== undefined) {
      query += ' AND favorite = ?'
      params.push(options.favorite)
    }

    if (options.rating !== undefined) {
      query += ' AND rating = ?'
      params.push(options.rating)
    }

    const sortBy = options.sortBy || 'created_at'
    const sortOrder = options.sortOrder || 'DESC'
    query += ` ORDER BY ${sortBy} ${sortOrder}`

    if (options.limit) {
      query += ' LIMIT ?'
      params.push(options.limit)
    }

    if (options.offset) {
      query += ' OFFSET ?'
      params.push(options.offset)
    }

    const selectPhotos = this.db.prepare(query)
    return selectPhotos.all(...params) as Photo[]
  }

  updatePhoto(id: string, updates: Partial<Omit<Photo, 'id' | 'filepath' | 'indexed_at'>>): Photo | null {
    const fields = Object.keys(updates).filter(key => updates[key as keyof typeof updates] !== undefined)
    if (fields.length === 0) return this.getPhoto(id)

    const setClause = fields.map(field => `${field} = ?`).join(', ')
    const values = fields.map(field => updates[field as keyof typeof updates])
    
    const updatePhoto = this.db.prepare(`UPDATE photos SET ${setClause} WHERE id = ?`)
    updatePhoto.run(...values, id)
    
    return this.getPhoto(id)
  }

  deletePhoto(id: string): boolean {
    const deletePhoto = this.db.prepare('DELETE FROM photos WHERE id = ?')
    const result = deletePhoto.run(id)
    return result.changes > 0
  }

  // Album operations
  createAlbum(albumData: Omit<Album, 'id' | 'created_at' | 'modified_at'>): Album {
    const id = randomUUID()
    const insertAlbum = this.db.prepare(`
      INSERT INTO albums (id, name, description, cover_photo_id) 
      VALUES (?, ?, ?, ?)
    `)

    insertAlbum.run(id, albumData.name, albumData.description, albumData.cover_photo_id)
    return this.getAlbum(id)!
  }

  getAlbum(id: string): Album | null {
    const selectAlbum = this.db.prepare('SELECT * FROM albums WHERE id = ?')
    return selectAlbum.get(id) as Album | null
  }

  getAlbums(): Album[] {
    const selectAlbums = this.db.prepare('SELECT * FROM albums ORDER BY name')
    return selectAlbums.all() as Album[]
  }

  addPhotoToAlbum(photoId: string, albumId: string): boolean {
    const insertPhotoAlbum = this.db.prepare(`
      INSERT OR IGNORE INTO photo_albums (photo_id, album_id) 
      VALUES (?, ?)
    `)
    const result = insertPhotoAlbum.run(photoId, albumId)
    return result.changes > 0
  }

  removePhotoFromAlbum(photoId: string, albumId: string): boolean {
    const deletePhotoAlbum = this.db.prepare(`
      DELETE FROM photo_albums WHERE photo_id = ? AND album_id = ?
    `)
    const result = deletePhotoAlbum.run(photoId, albumId)
    return result.changes > 0
  }

  getAlbumPhotos(albumId: string): Photo[] {
    const selectAlbumPhotos = this.db.prepare(`
      SELECT p.* FROM photos p
      JOIN photo_albums pa ON p.id = pa.photo_id
      WHERE pa.album_id = ?
      ORDER BY pa.added_at DESC
    `)
    return selectAlbumPhotos.all(albumId) as Photo[]
  }

  // Tag operations
  createTag(tagData: Omit<Tag, 'id' | 'created_at'>): Tag {
    const id = randomUUID()
    const insertTag = this.db.prepare(`
      INSERT INTO tags (id, name, color) VALUES (?, ?, ?)
    `)

    insertTag.run(id, tagData.name, tagData.color)
    return this.getTag(id)!
  }

  getTag(id: string): Tag | null {
    const selectTag = this.db.prepare('SELECT * FROM tags WHERE id = ?')
    return selectTag.get(id) as Tag | null
  }

  getTags(): Tag[] {
    const selectTags = this.db.prepare('SELECT * FROM tags ORDER BY name')
    return selectTags.all() as Tag[]
  }

  addPhotoTag(photoId: string, tagId: string): boolean {
    const insertPhotoTag = this.db.prepare(`
      INSERT OR IGNORE INTO photo_tags (photo_id, tag_id) 
      VALUES (?, ?)
    `)
    const result = insertPhotoTag.run(photoId, tagId)
    return result.changes > 0
  }

  removePhotoTag(photoId: string, tagId: string): boolean {
    const deletePhotoTag = this.db.prepare(`
      DELETE FROM photo_tags WHERE photo_id = ? AND tag_id = ?
    `)
    const result = deletePhotoTag.run(photoId, tagId)
    return result.changes > 0
  }

  getPhotoTags(photoId: string): Tag[] {
    const selectPhotoTags = this.db.prepare(`
      SELECT t.* FROM tags t
      JOIN photo_tags pt ON t.id = pt.tag_id
      WHERE pt.photo_id = ?
      ORDER BY t.name
    `)
    return selectPhotoTags.all(photoId) as Tag[]
  }

  // Directory operations
  createOrUpdateDirectory(directoryData: Omit<Directory, 'id'>): Directory {
    const existingDir = this.getDirectoryByPath(directoryData.path)
    
    if (existingDir) {
      const updateDir = this.db.prepare(`
        UPDATE directories SET name = ?, last_scanned = ?, photo_count = ?, total_size = ?
        WHERE path = ?
      `)
      updateDir.run(
        directoryData.name,
        directoryData.last_scanned,
        directoryData.photo_count,
        directoryData.total_size,
        directoryData.path
      )
      return this.getDirectoryByPath(directoryData.path)!
    } else {
      const id = randomUUID()
      const insertDir = this.db.prepare(`
        INSERT INTO directories (id, path, name, last_scanned, photo_count, total_size)
        VALUES (?, ?, ?, ?, ?, ?)
      `)
      insertDir.run(
        id,
        directoryData.path,
        directoryData.name,
        directoryData.last_scanned,
        directoryData.photo_count,
        directoryData.total_size
      )
      return this.getDirectory(id)!
    }
  }

  getDirectory(id: string): Directory | null {
    const selectDir = this.db.prepare('SELECT * FROM directories WHERE id = ?')
    return selectDir.get(id) as Directory | null
  }

  getDirectoryByPath(path: string): Directory | null {
    const selectDir = this.db.prepare('SELECT * FROM directories WHERE path = ?')
    return selectDir.get(path) as Directory | null
  }

  getDirectories(): Directory[] {
    const selectDirs = this.db.prepare('SELECT * FROM directories ORDER BY last_scanned DESC')
    return selectDirs.all() as Directory[]
  }

  deleteDirectory(id: string): boolean {
    const deleteDir = this.db.prepare('DELETE FROM directories WHERE id = ?')
    const result = deleteDir.run(id)
    return result.changes > 0
  }

  // Statistics
  getPhotoCount(): number {
    const countPhotos = this.db.prepare('SELECT COUNT(*) as count FROM photos')
    return (countPhotos.get() as { count: number }).count
  }

  getTotalFileSize(): number {
    const totalSize = this.db.prepare('SELECT SUM(filesize) as total FROM photos')
    return (totalSize.get() as { total: number }).total || 0
  }

  // Hash operations
  createOrUpdateImageHash(sha256Hash: string): ImageHash {
    const existingHash = this.getImageHashBySha256(sha256Hash)
    
    if (existingHash) {
      // Update file count
      const updateHash = this.db.prepare(`
        UPDATE image_hashes SET file_count = file_count + 1 WHERE sha256_hash = ?
      `)
      updateHash.run(sha256Hash)
      return this.getImageHashBySha256(sha256Hash)!
    } else {
      // Create new hash record
      const id = randomUUID()
      const insertHash = this.db.prepare(`
        INSERT INTO image_hashes (id, sha256_hash, file_count) VALUES (?, ?, 1)
      `)
      insertHash.run(id, sha256Hash)
      return this.getImageHash(id)!
    }
  }

  getImageHash(id: string): ImageHash | null {
    const selectHash = this.db.prepare('SELECT * FROM image_hashes WHERE id = ?')
    return selectHash.get(id) as ImageHash | null
  }

  getImageHashBySha256(sha256Hash: string): ImageHash | null {
    const selectHash = this.db.prepare('SELECT * FROM image_hashes WHERE sha256_hash = ?')
    return selectHash.get(sha256Hash) as ImageHash | null
  }

  associatePhotoWithHash(photoId: string, hashId: string): boolean {
    const insertPhotoHash = this.db.prepare(`
      INSERT OR IGNORE INTO photo_hashes (photo_id, hash_id) VALUES (?, ?)
    `)
    const result = insertPhotoHash.run(photoId, hashId)
    return result.changes > 0
  }

  getPhotosByHash(sha256Hash: string): Photo[] {
    const selectPhotos = this.db.prepare(`
      SELECT p.* FROM photos p
      JOIN photo_hashes ph ON p.id = ph.photo_id
      JOIN image_hashes ih ON ph.hash_id = ih.id
      WHERE ih.sha256_hash = ?
      ORDER BY p.created_at DESC
    `)
    return selectPhotos.all(sha256Hash) as Photo[]
  }

  getDuplicateHashes(): ImageHash[] {
    const selectDuplicates = this.db.prepare(`
      SELECT * FROM image_hashes WHERE file_count > 1 ORDER BY file_count DESC
    `)
    return selectDuplicates.all() as ImageHash[]
  }

  getPhotosWithDuplicates(): Photo[] {
    const selectPhotos = this.db.prepare(`
      SELECT DISTINCT p.* FROM photos p
      JOIN photo_hashes ph ON p.id = ph.photo_id
      JOIN image_hashes ih ON ph.hash_id = ih.id
      WHERE ih.file_count > 1
      ORDER BY p.created_at DESC
    `)
    return selectPhotos.all() as Photo[]
  }

  // Thumbnail caching operations
  getCachedThumbnail(photoId: string, size: number): Buffer | null {
    const selectThumbnail = this.db.prepare(`
      SELECT thumbnail_blob FROM photos 
      WHERE id = ? AND thumbnail_size = ? AND thumbnail_blob IS NOT NULL
    `)
    const result = selectThumbnail.get(photoId, size) as { thumbnail_blob: Buffer } | null
    return result?.thumbnail_blob || null
  }

  updateThumbnailCache(photoId: string, size: number, thumbnailData: Buffer): boolean {
    const updateThumbnail = this.db.prepare(`
      UPDATE photos 
      SET thumbnail_blob = ?, thumbnail_size = ?, thumbnail_generated_at = CURRENT_TIMESTAMP 
      WHERE id = ?
    `)
    const result = updateThumbnail.run(thumbnailData, size, photoId)
    return result.changes > 0
  }

  clearThumbnailCache(photoId?: string): boolean {
    if (photoId) {
      const clearThumbnail = this.db.prepare(`
        UPDATE photos 
        SET thumbnail_blob = NULL, thumbnail_size = NULL, thumbnail_generated_at = NULL 
        WHERE id = ?
      `)
      const result = clearThumbnail.run(photoId)
      return result.changes > 0
    } else {
      // Clear all thumbnail caches
      const clearAllThumbnails = this.db.prepare(`
        UPDATE photos 
        SET thumbnail_blob = NULL, thumbnail_size = NULL, thumbnail_generated_at = NULL
      `)
      const result = clearAllThumbnails.run()
      return result.changes > 0
    }
  }
}

export const photoService = new PhotoService()