// All available file metadata fields from Google Drive API v3
export const ALL_FILE_FIELDS = [
  // Basic Info
  'id',
  'name',
  'mimeType',
  'kind',
  'description',
  'originalFilename',
  'fullFileExtension',
  'fileExtension',
  // Ownership & Sharing
  'owners',
  'permissions',
  'permissionIds',
  'shared',
  'ownedByMe',
  'writersCanShare',
  'viewersCanCopyContent',
  'copyRequiresWriterPermission',
  'sharingUser',
  // Labels/Tags
  'starred',
  'trashed',
  'explicitlyTrashed',
  'properties',
  'appProperties',
  'folderColorRgb',
  // Timestamps
  'createdTime',
  'modifiedTime',
  'modifiedByMeTime',
  'viewedByMeTime',
  'sharedWithMeTime',
  'trashedTime',
  // User Info
  'lastModifyingUser',
  'trashingUser',
  'viewedByMe',
  'modifiedByMe',
  // Links
  'webViewLink',
  'webContentLink',
  'iconLink',
  'thumbnailLink',
  'exportLinks',
  // Size & Storage
  'size',
  'quotaBytesUsed',
  // Checksums
  'md5Checksum',
  'sha1Checksum',
  'sha256Checksum',
  // Hierarchy & Location
  'parents',
  'spaces',
  'driveId',
  'teamDriveId',
  // Capabilities
  'capabilities',
  // Versions
  'version',
  'headRevisionId',
  // Media Metadata
  'hasThumbnail',
  'thumbnailVersion',
  'imageMediaMetadata',
  'videoMediaMetadata',
  'contentHints',
  // Other
  'isAppAuthorized',
  'contentRestrictions',
  'resourceKey',
  'shortcutDetails',
  'linkShareMetadata',
  'labelInfo',
  'hasAugmentedPermissions',
  'inheritedPermissionsDisabled',
  'downloadRestrictions',
].join(',')

// All revision fields from Google Drive API v3
export const ALL_REVISION_FIELDS = [
  'id',
  'mimeType',
  'modifiedTime',
  'keepForever',
  'published',
  'publishAuto',
  'publishedLink',
  'publishedOutsideDomain',
  'lastModifyingUser',
  'originalFilename',
  'md5Checksum',
  'size',
  'exportLinks',
  'kind',
].join(',')

/** All reply fields requested from the Google Drive API v3. */
const ALL_REPLY_FIELDS = [
  'id',
  'kind',
  'createdTime',
  'modifiedTime',
  'author',
  'htmlContent',
  'content',
  'deleted',
  'action',
].join(',')

/** All comment fields requested from the Google Drive API v3. */
export const ALL_COMMENT_FIELDS = [
  'id',
  'kind',
  'createdTime',
  'modifiedTime',
  'author',
  'htmlContent',
  'content',
  'deleted',
  'resolved',
  'anchor',
  'quotedFileContent',
  `replies(${ALL_REPLY_FIELDS})`,
].join(',')

/**
 * Maximum bytes accepted when exporting a Google Workspace file.
 * Mirrors Google's own 10 MB export ceiling and keeps memory bounded.
 */
export const MAX_EXPORT_BYTES = 10 * 1024 * 1024

export const GOOGLE_WORKSPACE_MIME_TYPES = [
  'application/vnd.google-apps.document', // Google Docs
  'application/vnd.google-apps.spreadsheet', // Google Sheets
  'application/vnd.google-apps.presentation', // Google Slides
  'application/vnd.google-apps.drawing', // Google Drawings
  'application/vnd.google-apps.form', // Google Forms
  'application/vnd.google-apps.script', // Google Apps Scripts
]

export const DEFAULT_EXPORT_FORMATS: Record<string, string> = {
  'application/vnd.google-apps.document': 'text/plain',
  'application/vnd.google-apps.spreadsheet': 'text/csv',
  'application/vnd.google-apps.presentation': 'text/plain',
  'application/vnd.google-apps.drawing': 'image/png',
  'application/vnd.google-apps.form': 'application/zip',
  'application/vnd.google-apps.script': 'application/vnd.google-apps.script+json',
}

/**
 * Valid export formats per Google Workspace file type.
 * See: https://developers.google.com/drive/api/guides/ref-export-formats
 */
export const VALID_EXPORT_FORMATS: Record<string, string[]> = {
  'application/vnd.google-apps.document': [
    'text/plain',
    'text/html',
    'application/pdf',
    'application/vnd.openxmlformats-officedocument.wordprocessingml.document',
    'application/vnd.oasis.opendocument.text',
    'application/rtf',
    'application/epub+zip',
    'text/markdown',
  ],
  'application/vnd.google-apps.spreadsheet': [
    'text/csv',
    'text/tab-separated-values',
    'application/pdf',
    'application/vnd.openxmlformats-officedocument.spreadsheetml.sheet',
    'application/vnd.oasis.opendocument.spreadsheet',
    'application/zip',
  ],
  'application/vnd.google-apps.presentation': [
    'text/plain',
    'application/pdf',
    'application/vnd.openxmlformats-officedocument.presentationml.presentation',
    'application/vnd.oasis.opendocument.presentation',
    'image/jpeg',
    'image/png',
    'image/svg+xml',
  ],
  'application/vnd.google-apps.drawing': [
    'application/pdf',
    'image/jpeg',
    'image/png',
    'image/svg+xml',
  ],
  'application/vnd.google-apps.form': ['application/zip'],
  'application/vnd.google-apps.script': ['application/vnd.google-apps.script+json'],
}

export const SOURCE_MIME_TYPES: Record<string, string> = {
  'application/vnd.google-apps.document': 'text/plain',
  'application/vnd.google-apps.spreadsheet': 'text/csv',
  'application/vnd.google-apps.presentation': 'application/vnd.ms-powerpoint',
}

export function handleSheetsFormat(input: unknown): {
  csv?: string
  rowCount: number
  columnCount: number
} {
  let workingValue: unknown = input

  if (typeof workingValue === 'string') {
    try {
      workingValue = JSON.parse(workingValue)
    } catch (_error) {
      const csvString = workingValue as string
      return { csv: csvString, rowCount: 0, columnCount: 0 }
    }
  }

  if (!Array.isArray(workingValue)) {
    return { rowCount: 0, columnCount: 0 }
  }

  let table: unknown[] = workingValue

  if (
    table.length > 0 &&
    typeof (table as any)[0] === 'object' &&
    (table as any)[0] !== null &&
    !Array.isArray((table as any)[0])
  ) {
    const allKeys = new Set<string>()
    ;(table as any[]).forEach((obj) => {
      if (obj && typeof obj === 'object') {
        Object.keys(obj).forEach((key) => allKeys.add(key))
      }
    })
    const headers = Array.from(allKeys)
    const rows = (table as any[]).map((obj) => {
      if (!obj || typeof obj !== 'object') {
        return Array(headers.length).fill('')
      }
      return headers.map((key) => {
        const value = (obj as Record<string, unknown>)[key]
        if (value !== null && typeof value === 'object') {
          return JSON.stringify(value)
        }
        return value === undefined ? '' : (value as any)
      })
    })
    table = [headers, ...rows]
  }

  const escapeCell = (cell: unknown): string => {
    if (cell === null || cell === undefined) return ''
    const stringValue = String(cell)
    const mustQuote = /[",\n\r]/.test(stringValue)
    const doubledQuotes = stringValue.replace(/"/g, '""')
    return mustQuote ? `"${doubledQuotes}"` : doubledQuotes
  }

  const rowsAsStrings = (table as unknown[]).map((row) => {
    if (!Array.isArray(row)) {
      return escapeCell(row)
    }
    return row.map((cell) => escapeCell(cell)).join(',')
  })

  const csv = rowsAsStrings.join('\r\n')
  const rowCount = Array.isArray(table) ? (table as any[]).length : 0
  const columnCount =
    Array.isArray(table) && Array.isArray((table as any[])[0]) ? (table as any[])[0].length : 0

  return { csv, rowCount, columnCount }
}