import {z} from 'zod'

export type ProxyConnectionType = 'none' | 'http' | 'socks5' | 'ssh';

export type Server = {host: string, port: number, id?: (string | null) | undefined, secret?: (string | null) | undefined};

export type ProxyChoice = {value: ProxyConnectionType, extra?: (Server | null) | undefined};

export type TestProxyRequest = {proxy: ProxyChoice};

export type CreateApiGeneralTestProxyArgs = {body: TestProxyRequest};

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

export const proxyTestResultStatus = z.enum(["success", "partial_success", "failure"]);

export const proxyValidationStep = z.enum(["ssh_connection", "direct_ping", "direct_https", "proxy_ipv4", "proxy_ipv6", "proxy_website", "proxy_location"]);

export const proxyTestStepResponse = z.object({step: proxyValidationStep, name: z.string(), successful: z.boolean(), comment: z.string().nullable().optional()});

export const testProxyResponse = z.object({result: proxyTestResultStatus, steps: z.array(proxyTestStepResponse)});

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
};

/**
 * Tests the given proxy connection and returns every individual test step together with an overall summary. The summary is 'success' when
 * every step passes, 'partial_success' when the website could be reached through at least one of IPv4, IPv6 or DNS name and the IP location
 * lookup also succeeded, otherwise 'failure'.
 * 
 * POST /general/test-proxy
 */
export const createApiGeneralTestProxy = async (args: CreateApiGeneralTestProxyArgs, options?: CreateApiGeneralTestProxyOptions) => {
const {baseUrl = "http://localhost:5050", fetch: fetchFn = fetch} = options ?? {}

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

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