import {z} from 'zod'

export type SarvamModelAPITranslateSourceLanguage = 'auto' | 'bn-IN' | 'en-IN' | 'gu-IN' | 'hi-IN' | 'kn-IN' | 'ml-IN' | 'mr-IN' | 'od-IN' | 'pa-IN' | 'ta-IN' | 'te-IN' | 'as-IN' | 'brx-IN' | 'doi-IN' | 'kok-IN' | 'ks-IN' | 'mai-IN' | 'mni-IN' | 'ne-IN' | 'sa-IN' | 'sat-IN' | 'sd-IN' | 'ur-IN';

export type SarvamModelAPITranslateTargetLanguage = 'bn-IN' | 'en-IN' | 'gu-IN' | 'hi-IN' | 'kn-IN' | 'ml-IN' | 'mr-IN' | 'od-IN' | 'pa-IN' | 'ta-IN' | 'te-IN' | 'as-IN' | 'brx-IN' | 'doi-IN' | 'kok-IN' | 'ks-IN' | 'mai-IN' | 'mni-IN' | 'ne-IN' | 'sa-IN' | 'sat-IN' | 'sd-IN' | 'ur-IN';

export type SarvamModelAPITranslateSpeakerGender = 'Male' | 'Female';

export type SarvamModelAPITranslateMode = 'formal' | 'modern-colloquial' | 'classic-colloquial' | 'code-mixed';

export type SarvamModelAPITranslateModel = 'mayura:v1' | 'sarvam-translate:v1';

export type SarvamModelAPITransliterateMode = 'roman' | 'fully-native' | 'spoken-form-in-native';

export type SarvamModelAPINumeralsFormat = 'international' | 'native';

export type SarvamModelAPITranslationRequest = {input: string, source_language_code: SarvamModelAPITranslateSourceLanguage, target_language_code: SarvamModelAPITranslateTargetLanguage, speaker_gender?: SarvamModelAPITranslateSpeakerGender | undefined, mode?: SarvamModelAPITranslateMode | undefined, model?: SarvamModelAPITranslateModel | undefined, output_script?: (SarvamModelAPITransliterateMode | null) | undefined, numerals_format?: SarvamModelAPINumeralsFormat | undefined};

export type CreateApiTranslateArgs = {'api-subscription-key': string, body: SarvamModelAPITranslationRequest};

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

export const sarvamModelAPITranslationResponse = z.object({request_id: z.string().nullable(), translated_text: z.string(), source_language_code: z.string()});

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
};

/**
 * Translate Text
 * 
 * POST /translate
 */
export const createApiTranslate = async (args: CreateApiTranslateArgs, options?: CreateApiTranslateOptions) => {
const {baseUrl = "https://api.sarvam.ai", fetch: fetchFn = fetch} = options ?? {}

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

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

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

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

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

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