import {z} from 'zod'

export type V4ExperimentCreateRequest = {name: string, alias_id: string, description?: string | undefined, segment_percent?: (number | null) | undefined, primary_metric?: (string | null) | undefined, goal_value?: (number | null) | undefined, goal_direction?: (string | null) | undefined, context_key?: string | undefined, is_context_specific?: boolean | undefined};

export type CreateApiExperimentsArgs = {body: V4ExperimentCreateRequest};

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

export const v4Experiment = z.object({object: z.string().optional(), id: z.string().optional(), url: z.string().optional(), name: z.string().optional(), alias_id: z.string().optional(), description: z.string().optional(), status: z.string().optional(), started_at: z.string().nullable().optional(), finished_at: z.string().nullable().optional(), segment_percent: z.number().nullable().optional(), primary_metric: z.string().nullable().optional(), goal_value: z.number().nullable().optional(), goal_direction: z.string().nullable().optional(), context_key: z.string().optional(), is_context_specific: z.boolean().optional(), created_at: z.string().optional(), updated_at: z.string().optional()});

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
};

/**
 * Create an experiment
 * 
 * POST /experiments
 */
export const createApiExperiments = async (args: CreateApiExperimentsArgs, options?: CreateApiExperimentsOptions) => {
const {baseUrl = "https://api.qonversion.io/v4", fetch: fetchFn = fetch, secretAuth} = options ?? {}

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

if (secretAuth !== undefined) headers.set('authorization', `Bearer ${secretAuth}`)

const url = `${baseUrl.replace(/\/+$/, '')}/experiments${query.size > 0 ? `?${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(v4Experiment, await res.json())
};