import {z} from 'zod'

export type EvalBacktestContinuation = {cursor: string, sourceHash: string, reservationId: string, draftHash: string};

export type EvalBacktestDraft = {continuation?: EvalBacktestContinuation | undefined, assertions: {mode: 'replace' | 'extend' | 'inherit', list: Array<Record<string, never>>}, matchOptions?: (Record<string, never> | null) | undefined};

export type CreateApiProjectsProjectIdEvalRunsRunIdBacktestArgs = {'x-mcpjam-eval-vocabulary'?: ('1' | '2') | undefined, projectId: string, runId: string, body: EvalBacktestDraft};

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

export const evalBacktestContinuation = z.object({cursor: z.string().min(1).max(8192), sourceHash: z.string().min(1).max(256), reservationId: z.string().min(1).max(256), draftHash: z.string().min(1).max(256)});

export const evalBacktestReport = z.object({schemaVersion: z.unknown(), sourceRunId: z.string(), sourceHash: z.string(), draftHash: z.string(), configRevision: z.unknown(), complete: z.boolean(), continuationAvailable: z.boolean(), continuation: evalBacktestContinuation.optional(), counts: z.object({iterations: z.number().int().gte(0).optional(), comparable: z.number().int().gte(0).optional(), ungradable: z.number().int().gte(0).optional(), flipped: z.number().int().gte(0).optional()}), differences: z.array(z.object({})), modelUse: z.literal("none")});

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
};

/**
 * Preview deterministic draft evaluators against stored evidence
 * 
 * POST /projects/{projectId}/eval-runs/{runId}/backtest
 */
export const createApiProjectsProjectIdEvalRunsRunIdBacktest = async (args: CreateApiProjectsProjectIdEvalRunsRunIdBacktestArgs, options?: CreateApiProjectsProjectIdEvalRunsRunIdBacktestOptions) => {
const {baseUrl = "https://app.mcpjam.com/api/v1", fetch: fetchFn = fetch, bearerAuth} = options ?? {}

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

if (args['x-mcpjam-eval-vocabulary'] != null) headers.set("x-mcpjam-eval-vocabulary", String(args['x-mcpjam-eval-vocabulary']))
if (bearerAuth !== undefined) headers.set('authorization', `Bearer ${bearerAuth}`)

const url = `${baseUrl.replace(/\/+$/, '')}/projects/${encodeURIComponent(String(args.projectId))}/eval-runs/${encodeURIComponent(String(args.runId))}/backtest${query.size > 0 ? `?${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(evalBacktestReport, await res.json())
};