import {z} from 'zod'

export type Method = 'GET' | 'POST' | 'DELETE' | 'PUT' | 'HEAD' | 'PATCH' | 'OPTIONS';

export type ProxiedRawHttpRequest = {path: string, method: Method, api_version?: number | undefined, headers?: {[key: string]: string} | undefined, body_base64?: (string | null) | undefined};

export type ProxyRequest = {tenant_id: string, node_id: string, request_id?: (string | null) | undefined, http: ProxiedRawHttpRequest};

export type CreateApiUserProxyCachedArgs = {body: ProxyRequest};

export type CreateApiUserProxyCachedOptions = {baseUrl: string, UserKey?: string | undefined, fetch?: typeof fetch | undefined};

export const proxiedHttpResponse = z.object({code: z.number().int(), body_json: z.record(z.string(), z.unknown()).nullable().optional()});

export const cachedProxyResponse = z.object({http: proxiedHttpResponse, request_id: z.string(), from_cache: z.boolean().optional(), cache_time: z.string().nullable().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
};

/**
 * Proxy Cached Endpoint
 * 
 * POST /user/proxy-cached
 */
export const createApiUserProxyCached = async (args: CreateApiUserProxyCachedArgs, options: CreateApiUserProxyCachedOptions) => {
const {baseUrl, fetch: fetchFn = fetch, UserKey} = options ?? {}

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

if (UserKey !== undefined) headers.set("X-Tenzir-UserKey", UserKey)

const url = `${baseUrl.replace(/\/+$/, '')}/user/proxy-cached${query.size > 0 ? `?${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(cachedProxyResponse, await res.json())
};