import {z} from 'zod'

export type GetApiV0TracksTrackIdDownloadArgs = {trackId: string, format?: 'mp3' | undefined, quality?: ('normal' | 'high') | undefined, expand?: 'stems' | undefined};

export type GetApiV0TracksTrackIdDownloadOptions = {baseUrl?: string | undefined, UserAuth?: string | undefined, fetch?: typeof fetch | undefined};

export const stemDownloadResponse = z.object({type: z.enum(["drums", "bass", "melody", "instruments", "vocals", "clean_vocals"]), url: z.string()});

export const trackDownloadResponse = z.object({url: z.string(), expires: z.string(), stems: z.array(stemDownloadResponse).optional()});

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
};

/**
 * Download track
 * 
 * GET /v0/tracks/{trackId}/download
 * 
 * Also accepts auth: EpidemicSoundConnectAuth, ApiKeyAuth
 */
export const getApiV0TracksTrackIdDownload = async (args: GetApiV0TracksTrackIdDownloadArgs, options?: GetApiV0TracksTrackIdDownloadOptions) => {
const {baseUrl = "https://partner-content-api.epidemicsound.com", fetch: fetchFn = fetch, UserAuth} = options ?? {}

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

if (args.format != null) query.append("format", String(args.format))
if (args.quality != null) query.append("quality", String(args.quality))
if (args.expand != null) query.append("expand", String(args.expand))
if (UserAuth !== undefined) headers.set('authorization', `Bearer ${UserAuth}`)

const url = `${baseUrl.replace(/\/+$/, '')}/v0/tracks/${encodeURIComponent(String(args.trackId))}/download${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(trackDownloadResponse, await res.json())
};