import {z} from 'zod'

export type AssistantEvaluationAlignmentRequest = {question: string, answer: string, ground_truth_answer: string};

export type CreateApiEvaluationMetricsAlignmentArgs = {'X-Pinecone-Api-Version': string, body: AssistantEvaluationAlignmentRequest};

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

export const assistantEvaluationMetrics = z.object({correctness: z.number(), completeness: z.number(), alignment: z.number()});

export const assistantEvaluationFact = z.object({content: z.string()});

export const assistantEvaluationEntailment = z.string();

export const assistantEvaluationEvaluatedFact = z.object({fact: assistantEvaluationFact, entailment: assistantEvaluationEntailment});

export const assistantEvaluationReasoning = z.object({evaluated_facts: z.array(assistantEvaluationEvaluatedFact)});

export const assistantEvaluationTokenCounts = z.object({prompt_tokens: z.number().int(), completion_tokens: z.number().int(), total_tokens: z.number().int()});

export const assistantEvaluationAlignmentResponse = z.object({metrics: assistantEvaluationMetrics, reasoning: assistantEvaluationReasoning, usage: assistantEvaluationTokenCounts});

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 an answer
 * 
 * POST /evaluation/metrics/alignment
 */
export const createApiEvaluationMetricsAlignment = async (args: CreateApiEvaluationMetricsAlignmentArgs, options?: CreateApiEvaluationMetricsAlignmentOptions) => {
const {baseUrl = "https://api.pinecone.io", fetch: fetchFn = fetch, ApiKeyAuth} = options ?? {}

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

if (args['X-Pinecone-Api-Version'] != null) headers.set("X-Pinecone-Api-Version", String(args['X-Pinecone-Api-Version']))
if (ApiKeyAuth !== undefined) headers.set("Api-Key", ApiKeyAuth)

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