import { expect, Page } from "@playwright/test"
import { spawn } from "child_process"
import { randomUUID } from "crypto"
import path from "path"
import express from "express"
import { TarWriter } from "utils/tar"
import {
  Agent,
  App,
  AppSharingLevel,
  Parse_Complete,
  Parse_Response,
  Provision_Complete,
  Provision_Response,
  Resource,
} from "./provisionerGenerated"
import { port } from "./playwright.config"

// createWorkspace creates a workspace for a template.
// It does not wait for it to be running, but it does navigate to the page.
export const createWorkspace = async (
  page: Page,
  templateName: string,
): Promise<string> => {
  await page.goto("/templates/" + templateName + "/workspace", {
    waitUntil: "networkidle",
  })
  const name = randomName()
  await page.getByLabel("name").fill(name)
  await page.getByTestId("form-submit").click()

  await expect(page).toHaveURL("/@admin/" + name)
  await page.getByTestId("build-status").isVisible()
  return name
}

// createTemplate navigates to the /templates/new page and uploads a template
// with the resources provided in the responses argument.
export const createTemplate = async (
  page: Page,
  responses?: EchoProvisionerResponses,
): Promise<string> => {
  // Required to have templates submit their provisioner type as echo!
  await page.addInitScript({
    content: "window.playwright = true",
  })
  await page.goto("/templates/new", { waitUntil: "networkidle" })
  await page.getByTestId("file-upload").setInputFiles({
    buffer: await createTemplateVersionTar(responses),
    mimeType: "application/x-tar",
    name: "template.tar",
  })
  const name = randomName()
  await page.getByLabel("Name *").fill(name)
  await page.getByTestId("form-submit").click()
  await expect(page).toHaveURL("/templates/" + name, {
    timeout: 30000,
  })
  return name
}

// startAgent runs the coder agent with the provided token.
// It awaits the agent to be ready before returning.
export const startAgent = async (page: Page, token: string): Promise<void> => {
  const coderMain = path.join(
    __dirname,
    "..",
    "..",
    "enterprise",
    "cmd",
    "coder",
    "main.go",
  )
  const cp = spawn("go", ["run", coderMain, "agent", "--no-reap"], {
    env: {
      ...process.env,
      CODER_AGENT_URL: "http://localhost:" + port,
      CODER_AGENT_TOKEN: token,
    },
  })
  let buffer = Buffer.of()
  cp.stderr.on("data", (data: Buffer) => {
    buffer = Buffer.concat([buffer, data])
  })
  try {
    await page.getByTestId("agent-status-ready").isVisible()
    // eslint-disable-next-line @typescript-eslint/no-explicit-any -- The error is a string
  } catch (ex: any) {
    throw new Error(ex.toString() + "\n" + buffer.toString())
  }
}

// Allows users to more easily define properties they want for agents and resources!
type RecursivePartial<T> = {
  [P in keyof T]?: T[P] extends (infer U)[]
    ? RecursivePartial<U>[]
    : T[P] extends object | undefined
    ? RecursivePartial<T[P]>
    : T[P]
}

interface EchoProvisionerResponses {
  // parse is for observing any Terraform variables
  parse?: RecursivePartial<Parse_Response>[]
  // plan occurs when the template is imported
  plan?: RecursivePartial<Provision_Response>[]
  // apply occurs when the workspace is built
  apply?: RecursivePartial<Provision_Response>[]
}

// createTemplateVersionTar consumes a series of echo provisioner protobufs and
// converts it into an uploadable tar file.
const createTemplateVersionTar = async (
  responses?: EchoProvisionerResponses,
): Promise<Buffer> => {
  if (!responses) {
    responses = {}
  }
  if (!responses.parse) {
    responses.parse = [{}]
  }
  if (!responses.apply) {
    responses.apply = [{}]
  }
  if (!responses.plan) {
    responses.plan = responses.apply
  }

  const tar = new TarWriter()
  responses.parse.forEach((response, index) => {
    response.complete = {
      templateVariables: [],
      ...response.complete,
    } as Parse_Complete
    tar.addFile(
      `${index}.parse.protobuf`,
      Parse_Response.encode(response as Parse_Response).finish(),
    )
  })

  const fillProvisionResponse = (
    response: RecursivePartial<Provision_Response>,
  ) => {
    response.complete = {
      error: "",
      state: new Uint8Array(),
      resources: [],
      parameters: [],
      gitAuthProviders: [],
      plan: new Uint8Array(),
      ...response.complete,
    } as Provision_Complete
    response.complete.resources = response.complete.resources?.map(
      (resource) => {
        if (resource.agents) {
          resource.agents = resource.agents?.map((agent) => {
            if (agent.apps) {
              agent.apps = agent.apps?.map((app) => {
                return {
                  command: "",
                  displayName: "example",
                  external: false,
                  icon: "",
                  sharingLevel: AppSharingLevel.PUBLIC,
                  slug: "example",
                  subdomain: false,
                  url: "",
                  ...app,
                } as App
              })
            }
            return {
              apps: [],
              architecture: "amd64",
              connectionTimeoutSeconds: 300,
              directory: "",
              env: {},
              id: randomUUID(),
              metadata: [],
              motdFile: "",
              name: "dev",
              operatingSystem: "linux",
              shutdownScript: "",
              shutdownScriptTimeoutSeconds: 0,
              startupScript: "",
              startupScriptBehavior: "",
              startupScriptTimeoutSeconds: 300,
              troubleshootingUrl: "",
              token: randomUUID(),
              ...agent,
            } as Agent
          })
        }
        return {
          agents: [],
          dailyCost: 0,
          hide: false,
          icon: "",
          instanceType: "",
          metadata: [],
          name: "dev",
          type: "echo",
          ...resource,
        } as Resource
      },
    )
  }

  responses.apply.forEach((response, index) => {
    fillProvisionResponse(response)

    tar.addFile(
      `${index}.provision.apply.protobuf`,
      Provision_Response.encode(response as Provision_Response).finish(),
    )
  })
  responses.plan.forEach((response, index) => {
    fillProvisionResponse(response)

    tar.addFile(
      `${index}.provision.plan.protobuf`,
      Provision_Response.encode(response as Provision_Response).finish(),
    )
  })
  return Buffer.from((await tar.write()) as ArrayBuffer)
}

const randomName = () => {
  return randomUUID().slice(0, 8)
}

// Awaiter is a helper that allows you to wait for a callback to be called.
// It is useful for waiting for events to occur.
export class Awaiter {
  private promise: Promise<void>
  private callback?: () => void

  constructor() {
    this.promise = new Promise((r) => (this.callback = r))
  }

  public done(): void {
    if (this.callback) {
      this.callback()
    } else {
      this.promise = Promise.resolve()
    }
  }

  public wait(): Promise<void> {
    return this.promise
  }
}

export const createServer = async (
  port: number,
): Promise<ReturnType<typeof express>> => {
  const e = express()
  await new Promise<void>((r) => e.listen(port, r))
  return e
}