import {z} from 'zod'

export type CreateApiEngageArgs = {project_id: number, workspace_id?: number | undefined, body: {distinct_id?: string | undefined, distinct_ids?: string | undefined, data_group_id?: string | undefined, where?: string | undefined, output_properties?: Array<string> | undefined, session_id?: string | undefined, page?: number | undefined, behaviors?: number | undefined, as_of_timestamp?: number | undefined, filter_by_cohort?: string | undefined, include_all_users?: boolean | undefined}};

export type CreateApiEngageOptions = {baseUrl?: string | undefined, ServiceAccount?: {username: string, password: string} | undefined, fetch?: typeof fetch | undefined};

export const createApiEngageResponse = z.object({page: z.number().int().optional(), page_size: z.number().int().optional(), session_id: z.string().optional(), status: z.string().optional(), total: z.number().int().optional(), results: z.array(z.object({$distinct_id: z.number().int().optional(), $properties: z.object({}).optional()})).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
};

/**
 * Query Profiles
 * 
 * POST /engage
 * 
 * Also accepts auth: ProjectSecret
 */
export const createApiEngage = async (args: CreateApiEngageArgs, options?: CreateApiEngageOptions) => {
const {baseUrl = "https://mixpanel.com/api/query", fetch: fetchFn = fetch, ServiceAccount} = options ?? {}

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

if (args.project_id != null) query.append("project_id", String(args.project_id))
if (args.workspace_id != null) query.append("workspace_id", String(args.workspace_id))
if (ServiceAccount !== undefined) headers.set('authorization', `Basic ${btoa(`${ServiceAccount.username}:${ServiceAccount.password}`)}`)

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

const res = await fetchFn(url, {method: "POST", headers, body: new URLSearchParams(Object.entries(args.body).flatMap(([key, value]) => (value == null ? [] : [[key, String(value)]])))})

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

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