import {z} from 'zod'

export type Mora = {text: string, consonant?: string | undefined, consonant_length?: number | undefined, vowel: string, vowel_length: number, pitch: number};

export type AccentPhrase = {moras: Array<Mora>, accent: number, pause_mora?: Mora | undefined, is_interrogative?: boolean | undefined};

export type CreateApiMoraDataArgs = {speaker: number, core_version?: string | undefined, body: Array<AccentPhrase>};

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

export const mora = z.object({text: z.string(), consonant: z.string().optional(), consonant_length: z.number().gte(0).optional(), vowel: z.string(), vowel_length: z.number().gte(0), pitch: z.number()});

export const accentPhrase = z.object({moras: z.array(mora), accent: z.number().int().gte(1), pause_mora: mora.optional(), is_interrogative: z.boolean().optional()});

export const createApiMoraDataResponse = z.array(accentPhrase);

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
};

/**
 * アクセント句から音素の長さと音高を得る
 * 
 * POST /mora_data
 */
export const createApiMoraData = async (args: CreateApiMoraDataArgs, options: CreateApiMoraDataOptions) => {
const {baseUrl, fetch: fetchFn = fetch} = options ?? {}

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

if (args.speaker != null) query.append("speaker", String(args.speaker))
if (args.core_version != null) query.append("core_version", String(args.core_version))

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

const res = await fetchFn(url, {method: "POST", headers, body: JSON.stringify(args.body)})

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

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