import {z} from 'zod'

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

export const engineName = z.string();

export const brandName = z.string();

export const updateInfo = z.object({version: z.string(), descriptions: z.array(z.string()), contributors: z.array(z.string()).optional()});

export const licenseInfo = z.object({name: z.string(), version: z.string().optional(), license: z.string().optional(), text: z.string()});

export const supportedFeatures = z.object({adjust_mora_pitch: z.boolean(), adjust_phoneme_length: z.boolean(), adjust_speed_scale: z.boolean(), adjust_pitch_scale: z.boolean(), adjust_intonation_scale: z.boolean(), adjust_volume_scale: z.boolean(), adjust_pause_length: z.boolean().optional(), interrogative_upspeak: z.boolean(), synthesis_morphing: z.boolean(), sing: z.boolean().optional(), manage_library: z.boolean().optional(), return_resource_url: z.boolean().optional(), apply_katakana_english: z.boolean().optional(), streaming_synthesis: z.boolean().optional()});

export const engineManifest = z.object({manifest_version: z.string(), name: engineName, brand_name: brandName, uuid: z.string(), url: z.string(), icon: z.string(), default_sampling_rate: z.number().int(), frame_rate: z.number(), terms_of_service: z.string(), update_infos: z.array(updateInfo), dependency_licenses: z.array(licenseInfo), supported_vvlib_manifest_version: z.string().optional(), supported_features: supportedFeatures});

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
};

/**
 * Engine Manifest
 * 
 * GET /engine_manifest
 */
export const getApiEngineManifest = async (options: GetApiEngineManifestOptions) => {
const {baseUrl, fetch: fetchFn = fetch} = options ?? {}

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

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