import {z} from 'zod'

export type GetApiInternalExperimentReportsArgs = {days?: number | undefined};

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

export const metricRow = z.object({key: z.enum(["strict_success", "completion", "wall_time_seconds", "input_tokens", "output_tokens", "total_tokens", "cost_usd"]), label: z.string(), unit: z.enum(["fraction", "seconds", "count", "usd"]), lower_is_better: z.boolean(), baseline: z.number(), treated: z.number(), difference: z.number(), ci_low: z.number(), ci_high: z.number(), mde: z.number(), effect_over_mde: z.number(), signal: z.enum(["significant", "directional", "under_mde", "inconclusive"]), mass_improvement: z.number()});

export const finding = z.object({family_id: z.string(), title: z.string(), treatment: z.string(), baseline_label: z.string(), treated_label: z.string(), scenario_count: z.number().int(), session_count: z.number().int(), model: z.string().nullable().optional(), metrics: z.array(metricRow)});

export const experimentReportsResponse = z.object({findings: z.array(finding), generated_at: z.string(), warnings: z.array(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
};

/**
 * List Experiment Reports
 * 
 * GET /internal/experiment-reports
 */
export const getApiInternalExperimentReports = async (args: GetApiInternalExperimentReportsArgs, options: GetApiInternalExperimentReportsOptions) => {
const {baseUrl, fetch: fetchFn = fetch, HTTPBearer} = options ?? {}

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

if (args.days != null) query.append("days", String(args.days))
if (HTTPBearer !== undefined) headers.set('authorization', `Bearer ${HTTPBearer}`)

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

const res = await fetchFn(url, {method: "GET", headers})

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

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