import {z} from 'zod'

export type GetApiWordsArgs = {surah_number: number, include_arabic_text?: boolean | undefined, language?: string | undefined, start_ayah_number?: number | undefined, end_ayah_number?: number | undefined};

export type GetApiWordsOptions = {baseUrl?: string | undefined, fetch?: typeof fetch | undefined};

export const word = z.object({position: z.number().int().optional(), arabic_text: z.string().optional(), translation: z.string().optional()});

export const words = z.object({surah_number: z.number().int().optional(), number: z.number().int().optional(), words: z.array(word).optional()});

export const wordsResponse = z.array(words);

export const validateResponse = async <Output>(
  schema: {
    readonly '~standard': {
      readonly validate: (value: unknown) => ({ readonly value: Output; readonly issues?: undefined } | { readonly issues: ReadonlyArray<{ readonly message: string; readonly path?: ReadonlyArray<PropertyKey | { readonly key: PropertyKey }> | undefined }> }) | Promise<{ readonly value: Output; readonly issues?: undefined } | { readonly issues: ReadonlyArray<{ readonly message: string; readonly path?: ReadonlyArray<PropertyKey | { readonly key: PropertyKey }> | undefined }> }>
    }
  },
  value: unknown
): Promise<Output> => {
  const result = await schema['~standard'].validate(value)

  if (result.issues !== undefined) {
    const detail = result.issues
      .map(({ message, path }) =>
        path?.length
          ? `${path.map((segment) => String(typeof segment === 'object' ? segment.key : segment)).join('.')}: ${message}`
          : message
      )
      .join('; ')

    throw new Error(`Response does not match the schema: ${detail}`, { cause: { issues: result.issues } })
  }

  return result.value
};

/**
 * List words of a specific surah
 * 
 * GET /words
 */
export const getApiWords = async (args: GetApiWordsArgs, options?: GetApiWordsOptions) => {
const {baseUrl = "https://digital-quran.quranacademy.com", fetch: fetchFn = fetch} = options ?? {}

const query = new URLSearchParams()
const headers = new Headers()
headers.set('accept', "application/json")

if (args.surah_number != null) query.append("surah_number", String(args.surah_number))
if (args.include_arabic_text != null) query.append("include_arabic_text", String(args.include_arabic_text))
if (args.language != null) query.append("language", String(args.language))
if (args.start_ayah_number != null) query.append("start_ayah_number", String(args.start_ayah_number))
if (args.end_ayah_number != null) query.append("end_ayah_number", String(args.end_ayah_number))

const url = `${baseUrl.replace(/\/+$/, '')}/words${query.size > 0 ? `?${query}` : ''}`

const res = await fetchFn(url, {method: "GET", headers})

if (!res.ok) throw new Error(`Request failed with status ${res.status}`, {cause: {status: res.status, body: await res.text()}})

return validateResponse(wordsResponse, await res.json())
};