import {z} from 'zod'

export type CreateApiSpeechToTextArgs = {'api-subscription-key': string, body: BodyInit};

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

export const sarvamModelAPITimestampsModel = z.object({words: z.array(z.string()), start_time_seconds: z.array(z.number()), end_time_seconds: z.array(z.number())});

export const sarvamModelAPIDiarizedEntry = z.object({transcript: z.string(), start_time_seconds: z.number(), end_time_seconds: z.number(), speaker_id: z.string()});

export const sarvamModelAPIDiarizedTranscript = z.object({entries: z.array(sarvamModelAPIDiarizedEntry)});

export const sarvamModelAPISpeechToTextResponse = z.object({request_id: z.string().nullable(), transcript: z.string(), timestamps: sarvamModelAPITimestampsModel.nullable().optional(), diarized_transcript: sarvamModelAPIDiarizedTranscript.nullable().optional(), language_code: z.string().nullable(), language_probability: z.number().nullable().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
};

/**
 * Speech to Text
 * 
 * POST /speech-to-text
 */
export const createApiSpeechToText = async (args: CreateApiSpeechToTextArgs, options?: CreateApiSpeechToTextOptions) => {
const {baseUrl = "https://api.sarvam.ai", fetch: fetchFn = fetch} = options ?? {}

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

if (args['api-subscription-key'] != null) headers.set("api-subscription-key", String(args['api-subscription-key']))

const url = `${baseUrl.replace(/\/+$/, '')}/speech-to-text${query.size > 0 ? `?${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(sarvamModelAPISpeechToTextResponse, await res.json())
};