import {z} from 'zod'

export type STTEncoding = 'pcm_s16le' | 'pcm_s32le' | 'pcm_f16le' | 'pcm_f32le' | 'pcm_mulaw' | 'pcm_alaw';

export type CreateApiSttArgs = {'Cartesia-Version': '2026-03-01', encoding?: STTEncoding | undefined, sample_rate?: (number | null) | undefined, body: BodyInit};

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

export const transcriptionWord = z.object({word: z.string(), start: z.number(), end: z.number()});

export const transcriptionResponse = z.object({type: z.literal("transcript"), request_id: z.string().optional(), text: z.string(), is_final: z.boolean().optional(), language: z.string().optional(), duration: z.number().optional(), words: z.array(transcriptionWord).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
};

/**
 * Batch Speech-to-Text
 * 
 * POST /stt
 * 
 * Also accepts auth: AccessTokenAuth
 */
export const createApiStt = async (args: CreateApiSttArgs, options?: CreateApiSttOptions) => {
const {baseUrl = "https://api.cartesia.ai", fetch: fetchFn = fetch, APIKeyAuth} = options ?? {}

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

if (args['Cartesia-Version'] != null) headers.set("Cartesia-Version", String(args['Cartesia-Version']))
if (args.encoding != null) query.append("encoding", String(args.encoding))
if (args.sample_rate != null) query.append("sample_rate", String(args.sample_rate))
if (APIKeyAuth !== undefined) headers.set('authorization', `Bearer ${APIKeyAuth}`)

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

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

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

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