import type {
  OperationContext,
  OperationOptions,
} from '@commerce/api/operations'
import {
  GetAllPagesQuery,
  GetAllPagesQueryVariables,
  PageEdge,
} from '../../schema'
import { normalizePages } from '../../utils'
import type { ShopifyConfig, Provider } from '..'
import type { GetAllPagesOperation, Page } from '../../types/page'
import getAllPagesQuery from '../../utils/queries/get-all-pages-query'

export default function getAllPagesOperation({
  commerce,
}: OperationContext<Provider>) {
  async function getAllPages<T extends GetAllPagesOperation>(opts?: {
    config?: Partial<ShopifyConfig>
    preview?: boolean
  }): Promise<T['data']>

  async function getAllPages<T extends GetAllPagesOperation>(
    opts: {
      config?: Partial<ShopifyConfig>
      preview?: boolean
    } & OperationOptions
  ): Promise<T['data']>

  async function getAllPages<T extends GetAllPagesOperation>({
    query = getAllPagesQuery,
    config,
    variables,
  }: {
    url?: string
    config?: Partial<ShopifyConfig>
    variables?: GetAllPagesQueryVariables
    preview?: boolean
    query?: string
  } = {}): Promise<T['data']> {
    const { fetch, locale, locales = ['en-US'] } = commerce.getConfig(config)

    const { data } = await fetch<GetAllPagesQuery, GetAllPagesQueryVariables>(
      query,
      {
        variables,
      },
      {
        ...(locale && {
          headers: {
            'Accept-Language': locale,
          },
        }),
      }
    )

    return {
      pages: locales.reduce<Page[]>(
        (arr, locale) =>
          arr.concat(normalizePages(data.pages.edges as PageEdge[], locale)),
        []
      ),
    }
  }

  return getAllPages
}