import { downloadToCSV, downloadToPNG } from '../actions'
import type { ConfigProps } from '../loader/types'
import type {
  TableDownloadConfig,
  TableWidgetConfig,
  TableColumn,
  Mode,
  SortDirection,
} from './types'

const DEFAULT_MODE: Mode = 'local'
export const DEFAULT_PAGE = 0
export const DEFAULT_ROWS_PER_PAGE = 10
export const DEFAULT_ROWS_PER_PAGE_OPTIONS = [5, 10, 25, 50]

export const DEFAULT_COLUMN_ID = null
export const DEFAULT_DIRECTION: SortDirection = 'asc'

/**
 * Creates download configuration for table widgets, supporting PNG (screenshot) and CSV (data) exports. CSV output uses column keys as headers and filters out `id` fields.
 *
 * @param props - Configuration with `refUI` reference for PNG export.
 * @returns Array of download items for use with the Download action.
 */
export function tableDownloadConfig({
  refUI,
}: ConfigProps): TableDownloadConfig {
  return [
    {
      ...downloadToPNG,
      modifier: () => downloadToPNG.modifier(refUI),
    },
    {
      ...downloadToCSV,
      modifier: async (data) => {
        if (!data?.length) {
          return downloadToCSV.modifier([])
        }

        // Convert table data to CSV format
        // First row contains headers (column keys)
        const firstRow = data[0]
        if (!firstRow) {
          return downloadToCSV.modifier([])
        }

        const headers = Object.keys(firstRow).filter((key) => key !== 'id')
        const rows = data.map((row) =>
          headers.map((header) => {
            const value = row[header]
            if (value === null || value === undefined) return ''
            if (typeof value === 'object') return JSON.stringify(value)
            return value
          }),
        )

        return downloadToCSV.modifier([headers, ...rows])
      },
    },
  ]
}

/**
 * Returns the default configuration for table widgets with pagination and sorting, including column definitions and local data mode.
 *
 * @param columns - Array of column definitions for the table.
 * @returns Default table widget config.
 */
export function tableConfig(columns: TableColumn[] = []): TableWidgetConfig {
  return {
    columns,
    selectable: false,
    mode: DEFAULT_MODE,
  }
}