import {z} from 'zod'

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

export const speakerStyle = z.object({name: z.string(), id: z.number().int(), type: z.enum(["talk", "singing_teacher", "frame_decode", "sing", "streaming_talk"]).optional()});

export const speakerSupportedFeatures = z.object({permitted_synthesis_morphing: z.enum(["ALL", "SELF_ONLY", "NOTHING"]).optional()});

export const speaker = z.object({name: z.string(), speaker_uuid: z.string(), styles: z.array(speakerStyle), version: z.string(), supported_features: speakerSupportedFeatures.optional()});

export const styleInfo = z.object({id: z.number().int(), icon: z.string(), portrait: z.string().optional(), voice_samples: z.array(z.string())});

export const speakerInfo = z.object({policy: z.string(), portrait: z.string(), style_infos: z.array(styleInfo)});

export const librarySpeaker = z.object({speaker: speaker, speaker_info: speakerInfo});

export const downloadableLibraryInfo = z.object({name: z.string(), uuid: z.string(), version: z.string(), download_url: z.string(), bytes: z.number().int(), speakers: z.array(librarySpeaker)});

export const getApiDownloadableLibrariesResponse = z.array(downloadableLibraryInfo);

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
};

/**
 * Downloadable Libraries
 * 
 * GET /downloadable_libraries
 */
export const getApiDownloadableLibraries = async (options: GetApiDownloadableLibrariesOptions) => {
const {baseUrl, fetch: fetchFn = fetch} = options ?? {}

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

const url = `${baseUrl.replace(/\/+$/, '')}/downloadable_libraries${query.size > 0 ? `?${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(getApiDownloadableLibrariesResponse, await res.json())
};