import {z} from 'zod'

export type Note = {id?: (string | null) | undefined, key?: number | undefined, frame_length: number, lyric: string};

export type Score = {notes: Array<Note>};

export type FramePhoneme = {phoneme: string, frame_length: number, note_id?: (string | null) | undefined};

export type FrameAudioQuery = {f0: Array<number>, volume: Array<number>, phonemes: Array<FramePhoneme>, volumeScale: number, outputSamplingRate: number, outputStereo: boolean};

export type BodySingFrameVolume = {score: Score, frame_audio_query: FrameAudioQuery};

export type CreateApiSingFrameVolumeArgs = {speaker: number, core_version?: string | undefined, body: BodySingFrameVolume};

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

export const createApiSingFrameVolumeResponse = z.array(z.number());

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
};

/**
 * 楽譜・歌唱音声合成用のクエリからフレームごとの音量を得る
 * 
 * POST /sing_frame_volume
 */
export const createApiSingFrameVolume = async (args: CreateApiSingFrameVolumeArgs, options: CreateApiSingFrameVolumeOptions) => {
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 = `${baseUrl.replace(/\/+$/, '')}/sing_frame_volume${query.size > 0 ? `?${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(createApiSingFrameVolumeResponse, await res.json())
};