import {z} from 'zod'

export type RequestSegmentV3 = {id: string, source: string, target: string};

export type LocaleCode = string;

export type EvaluationV3Request = {contentGroupId: string, segments: Array<RequestSegmentV3>, sourceLocaleCode: LocaleCode, targetLocaleCode: LocaleCode};

export type CreateApiV3EvaluationArgs = {'Content-Type': string, body: EvaluationV3Request};

export type CreateApiV3EvaluationOptions = {baseUrl?: string | undefined, fetch?: typeof fetch | undefined};

export const evaluationItemType = z.enum(["AI_CHECK", "QA_CHECK"]);

export const checkEvaluationV3 = z.object({isValid: z.boolean().optional(), explanation: z.string().optional(), hasError: z.boolean().optional(), errorMessage: z.string().optional()});

export const checkResultV3 = z.object({type: evaluationItemType, ruleUid: z.string().optional(), evaluation: checkEvaluationV3});

export const evaluatedSegmentV3 = z.object({id: z.string(), source: z.string(), target: z.string(), results: z.array(checkResultV3)});

export const evaluationV3Response = z.object({contentGroupId: z.string().optional(), segments: z.array(evaluatedSegmentV3)});

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
};

/**
 * Evaluate segments
 * 
 * POST /v3/evaluation
 */
export const createApiV3Evaluation = async (args: CreateApiV3EvaluationArgs, options?: CreateApiV3EvaluationOptions) => {
const {baseUrl = "https://eu.phrase.com/control-hub", 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['Content-Type'] != null) headers.set("Content-Type", String(args['Content-Type']))

const url = `${baseUrl.replace(/\/+$/, '')}/v3/evaluation${query.size > 0 ? `?${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(evaluationV3Response, await res.json())
};