import { components } from '../../../types/api'
import { Column, Columns } from './types'
import { distinct } from '../../../utils/arrayUtils'

const mandatoryColumns = (fields: Array<components['schemas']['FieldDefinition']>) =>
  fields.filter((field) => field.mandatory).map((field) => field.name)
const visibleColumns = (fields: Array<components['schemas']['FieldDefinition']>) =>
  fields.filter((field) => field.visible).map((field) => field.name)

const ensureMandatoryColumns = (fields: Array<components['schemas']['FieldDefinition']>, queryColumns: string[]) =>
  [...mandatoryColumns(fields), ...queryColumns].reduce(distinct, [])

export default {
  /**
   * Converts the columns from a DPD into a column readable format
   *
   * @param specification
   * @param requestedColumns
   */
  getColumns: (specification: components['schemas']['Specification'], requestedColumns: string[] = null): Columns => {
    const { fields } = specification

    const options: Column[] = fields
      .filter((field) => !specification.sections || !specification.sections.includes(field.name))
      .map((field) => ({
        text: field.display,
        value: field.name,
        disabled: field.mandatory,
      }))

    return {
      name: 'columns',
      options,
      text: 'Select report columns',
      value: ensureMandatoryColumns(fields, requestedColumns ?? visibleColumns(fields)),
    }
  },

  ensureMandatoryColumns,
}