/**
 * Storage utilities for file management
 * Provides high-level functions for common file operations
 */

import {
  uploadFile,
  moveToPermStorage,
  deleteFile,
  getFileUrl,
  validateFileType,
  validateFileSize,
  generateUniqueFilename,
} from './file-vault'

// File type configurations
export const FILE_CONFIGS = {
  image: {
    allowedTypes: ['image/jpeg', 'image/png', 'image/webp', 'image/gif', 'image/svg+xml'],
    maxSize: 10 * 1024 * 1024, // 10MB
    folder: 'images',
  },
  document: {
    allowedTypes: [
      'application/pdf',
      'application/msword',
      'application/vnd.openxmlformats-officedocument.wordprocessingml.document',
      'text/plain',
      'text/csv',
    ],
    maxSize: 20 * 1024 * 1024, // 20MB
    folder: 'documents',
  },
  avatar: {
    allowedTypes: ['image/jpeg', 'image/png', 'image/webp'],
    maxSize: 5 * 1024 * 1024, // 5MB
    folder: 'avatars',
  },
} as const

export type FileType = keyof typeof FILE_CONFIGS

// File upload result
export interface UploadResult {
  tempPath: string
  filename: string
  size: number
  type: string
  uploadedAt: string
}

// File confirmation result
export interface ConfirmResult {
  permanentPath: string
  filename: string
  folder: string
  url: string
  confirmedAt: string
}

/**
 * Upload file with type validation
 */
export async function uploadFileWithValidation(
  file: File,
  fileType: FileType
): Promise<UploadResult> {
  const config = FILE_CONFIGS[fileType]

  // Validate file type
  if (!validateFileType(file.type, [...config.allowedTypes])) {
    throw new Error(`Invalid file type. Allowed: ${config.allowedTypes.join(', ')}`)
  }

  // Validate file size
  if (!validateFileSize(file.size, config.maxSize)) {
    throw new Error(`File too large. Max size: ${config.maxSize / (1024 * 1024)}MB`)
  }

  // Convert file to buffer
  const bytes = await file.arrayBuffer()
  const buffer = Buffer.from(bytes)

  // Upload to external API (no temporary storage needed)
  const uploadResult = await uploadFile(buffer, file.name, file.type)

  return {
    tempPath: uploadResult.url, // Use URL as tempPath for compatibility
    filename: uploadResult.filename,
    size: file.size,
    type: file.type,
    uploadedAt: new Date().toISOString(),
  }
}

/**
 * Confirm upload and move to permanent storage
 * With the new API, files are already in permanent storage
 */
export async function confirmUpload(
  tempPath: string,
  fileType: FileType,
  customFilename?: string
): Promise<ConfirmResult> {
  const config = FILE_CONFIGS[fileType]

  // With the new API, tempPath is already the permanent URL
  const url = tempPath
  const filename = url.split('/').pop() || 'file'

  return {
    permanentPath: url,
    filename: filename,
    folder: config.folder,
    url: url,
    confirmedAt: new Date().toISOString(),
  }
}

/**
 * Delete file from storage
 */
export async function removeFile(filePath: string): Promise<void> {
  await deleteFile(filePath)
}

/**
 * Get signed URL for file access
 */
export async function getSignedUrl(filePath: string): Promise<string> {
  return await getFileUrl(filePath)
}

/**
 * Validate file before upload
 */
export function validateFile(file: File, fileType: FileType): { valid: boolean; error?: string } {
  const config = FILE_CONFIGS[fileType]

  // Check file type
  if (!validateFileType(file.type, [...config.allowedTypes])) {
    return {
      valid: false,
      error: `Invalid file type. Allowed: ${config.allowedTypes.join(', ')}`,
    }
  }

  // Check file size
  if (!validateFileSize(file.size, config.maxSize)) {
    return {
      valid: false,
      error: `File too large. Max size: ${config.maxSize / (1024 * 1024)}MB`,
    }
  }

  return { valid: true }
}

/**
 * Batch file operations
 */
export class FileBatch {
  private tempPaths: string[] = []

  async uploadFile(file: File, fileType: FileType): Promise<UploadResult> {
    const result = await uploadFileWithValidation(file, fileType)
    this.tempPaths.push(result.tempPath)
    return result
  }

  async confirmAll(fileType: FileType): Promise<ConfirmResult[]> {
    const results = []
    for (const tempPath of this.tempPaths) {
      const result = await confirmUpload(tempPath, fileType)
      results.push(result)
    }
    this.tempPaths = [] // Clear after confirmation
    return results
  }

  async cleanup(): Promise<void> {
    for (const tempPath of this.tempPaths) {
      try {
        await removeFile(tempPath)
      } catch (error) {
        console.error(`Failed to cleanup ${tempPath}:`, error)
      }
    }
    this.tempPaths = []
  }
}

/**
 * File metadata for database storage
 */
export interface FileMetadata {
  id: string
  filename: string
  originalName: string
  path: string
  size: number
  mimeType: string
  fileType: FileType
  uploadedBy: string
  uploadedAt: Date
  url?: string
}

/**
 * Helper to create file metadata
 */
export function createFileMetadata(
  uploadResult: UploadResult,
  confirmResult: ConfirmResult,
  fileType: FileType,
  uploadedBy: string
): Omit<FileMetadata, 'id'> {
  return {
    filename: confirmResult.filename,
    originalName: uploadResult.filename,
    path: confirmResult.permanentPath,
    size: uploadResult.size,
    mimeType: uploadResult.type,
    fileType,
    uploadedBy,
    uploadedAt: new Date(uploadResult.uploadedAt),
    url: confirmResult.url,
  }
}