import { field, logger } from "@coder/logger"
import * as cp from "child_process"
import { promises as fs } from "fs"
import http from "http"
import * as path from "path"
import { CliMessage } from "../../lib/vscode/src/vs/server/ipc"
import { plural } from "../common/util"
import { HealthHttpProvider } from "./app/health"
import { LoginHttpProvider } from "./app/login"
import { ProxyHttpProvider } from "./app/proxy"
import { StaticHttpProvider } from "./app/static"
import { UpdateHttpProvider } from "./app/update"
import { VscodeHttpProvider } from "./app/vscode"
import { Args, bindAddrFromAllSources, optionDescriptions, parse, readConfigFile, setDefaults } from "./cli"
import { AuthType, HttpServer, HttpServerOptions } from "./http"
import { loadPlugins } from "./plugin"
import { generateCertificate, hash, humanPath, open } from "./util"
import { ipcMain, wrap } from "./wrapper"

process.on("uncaughtException", (error) => {
  logger.error(`Uncaught exception: ${error.message}`)
  if (typeof error.stack !== "undefined") {
    logger.error(error.stack)
  }
})

let pkg: { version?: string; commit?: string } = {}
try {
  pkg = require("../../package.json")
} catch (error) {
  logger.warn(error.message)
}

const version = pkg.version || "development"
const commit = pkg.commit || "development"

const main = async (args: Args, cliArgs: Args, configArgs: Args): Promise<void> => {
  if (!args.auth) {
    args = {
      ...args,
      auth: AuthType.Password,
    }
  }

  logger.info(`Using user-data-dir ${humanPath(args["user-data-dir"])}`)

  logger.trace(`Using extensions-dir ${humanPath(args["extensions-dir"])}`)

  const envPassword = !!process.env.PASSWORD
  const password = args.auth === AuthType.Password && (process.env.PASSWORD || args.password)
  if (args.auth === AuthType.Password && !password) {
    throw new Error("Please pass in a password via the config file or $PASSWORD")
  }
  const [host, port] = bindAddrFromAllSources(cliArgs, configArgs)

  // Spawn the main HTTP server.
  const options: HttpServerOptions = {
    auth: args.auth,
    commit,
    host: host,
    // The hash does not add any actual security but we do it for obfuscation purposes.
    password: password ? hash(password) : undefined,
    port: port,
    proxyDomains: args["proxy-domain"],
    socket: args.socket,
    ...(args.cert && !args.cert.value
      ? await generateCertificate()
      : {
          cert: args.cert && args.cert.value,
          certKey: args["cert-key"],
        }),
  }

  if (options.cert && !options.certKey) {
    throw new Error("--cert-key is missing")
  }

  const httpServer = new HttpServer(options)
  httpServer.registerHttpProvider(["/", "/vscode"], VscodeHttpProvider, args)
  httpServer.registerHttpProvider("/update", UpdateHttpProvider, false)
  httpServer.registerHttpProvider("/proxy", ProxyHttpProvider)
  httpServer.registerHttpProvider("/login", LoginHttpProvider, args.config!, envPassword)
  httpServer.registerHttpProvider("/static", StaticHttpProvider)
  httpServer.registerHttpProvider("/healthz", HealthHttpProvider, httpServer.heart)

  await loadPlugins(httpServer, args)

  ipcMain().onDispose(() => {
    httpServer.dispose().then((errors) => {
      errors.forEach((error) => logger.error(error.message))
    })
  })

  logger.info(`code-server ${version} ${commit}`)
  const serverAddress = await httpServer.listen()
  logger.info(`HTTP server listening on ${serverAddress}`)

  if (args.auth === AuthType.Password) {
    if (envPassword) {
      logger.info("    - Using password from $PASSWORD")
    } else {
      logger.info(`    - Using password from ${humanPath(args.config)}`)
    }
    logger.info("    - To disable use `--auth none`")
  } else {
    logger.info("  - No authentication")
  }
  delete process.env.PASSWORD

  if (httpServer.protocol === "https") {
    logger.info(
      args.cert && args.cert.value
        ? `  - Using provided certificate and key for HTTPS`
        : `  - Using generated certificate and key for HTTPS`,
    )
  } else {
    logger.info("  - Not serving HTTPS")
  }

  if (httpServer.proxyDomains.size > 0) {
    logger.info(`  - ${plural(httpServer.proxyDomains.size, "Proxying the following domain")}:`)
    httpServer.proxyDomains.forEach((domain) => logger.info(`    - *.${domain}`))
  }

  if (serverAddress && !options.socket && args.open) {
    // The web socket doesn't seem to work if browsing with 0.0.0.0.
    const openAddress = serverAddress.replace(/:\/\/0.0.0.0/, "://localhost")
    await open(openAddress).catch(console.error)
    logger.info(`Opened ${openAddress}`)
  }
}

async function entry(): Promise<void> {
  const tryParse = async (): Promise<[Args, Args, Args]> => {
    try {
      const cliArgs = parse(process.argv.slice(2))
      const configArgs = await readConfigFile(cliArgs.config)
      // This prioritizes the flags set in args over the ones in the config file.
      let args = Object.assign(configArgs, cliArgs)
      args = await setDefaults(args)
      return [args, cliArgs, configArgs]
    } catch (error) {
      console.error(error.message)
      process.exit(1)
    }
  }

  const [args, cliArgs, configArgs] = await tryParse()
  if (args.help) {
    console.log("code-server", version, commit)
    console.log("")
    console.log(`Usage: code-server [options] [path]`)
    console.log("")
    console.log("Options")
    optionDescriptions().forEach((description) => {
      console.log("", description)
    })
  } else if (args.version) {
    if (args.json) {
      console.log({
        codeServer: version,
        commit,
        vscode: require("../../lib/vscode/package.json").version,
      })
    } else {
      console.log(version, commit)
    }
    process.exit(0)
  } else if (process.env.VSCODE_IPC_HOOK_CLI) {
    const pipeArgs: OpenCommandPipeArgs = {
      type: "open",
      folderURIs: [],
      forceReuseWindow: args["reuse-window"],
      forceNewWindow: args["new-window"],
    }
    const isDir = async (path: string): Promise<boolean> => {
      try {
        const st = await fs.stat(path)
        return st.isDirectory()
      } catch (error) {
        return false
      }
    }
    for (let i = 0; i < args._.length; i++) {
      const fp = path.resolve(args._[i])
      if (await isDir(fp)) {
        pipeArgs.folderURIs.push(fp)
      } else {
        if (!pipeArgs.fileURIs) {
          pipeArgs.fileURIs = []
        }
        pipeArgs.fileURIs.push(fp)
      }
    }
    if (pipeArgs.forceNewWindow && pipeArgs.fileURIs && pipeArgs.fileURIs.length > 0) {
      logger.error("new-window can only be used with folder paths")
      process.exit(1)
    }
    if (pipeArgs.folderURIs.length === 0 && (!pipeArgs.fileURIs || pipeArgs.fileURIs.length === 0)) {
      logger.error("Please specify at least one file or folder argument")
      process.exit(1)
    }
    const vscode = http.request(
      {
        path: "/",
        method: "POST",
        socketPath: process.env["VSCODE_IPC_HOOK_CLI"],
      },
      (res) => {
        res.on("data", (message) => {
          logger.debug("Got message from VS Code", field("message", message.toString()))
        })
      },
    )
    vscode.on("error", (err) => {
      logger.debug("Got error from VS Code", field("error", err))
    })
    vscode.write(JSON.stringify(pipeArgs))
    vscode.end()
  } else if (args["list-extensions"] || args["install-extension"] || args["uninstall-extension"]) {
    logger.debug("forking vs code cli...")
    const vscode = cp.fork(path.resolve(__dirname, "../../lib/vscode/out/vs/server/fork"), [], {
      env: {
        ...process.env,
        CODE_SERVER_PARENT_PID: process.pid.toString(),
      },
    })
    vscode.once("message", (message: any) => {
      logger.debug("Got message from VS Code", field("message", message))
      if (message.type !== "ready") {
        logger.error("Unexpected response waiting for ready response")
        process.exit(1)
      }
      const send: CliMessage = { type: "cli", args }
      vscode.send(send)
    })
    vscode.once("error", (error) => {
      logger.error(error.message)
      process.exit(1)
    })
    vscode.on("exit", (code) => process.exit(code || 0))
  } else {
    wrap(() => main(args, cliArgs, configArgs))
  }
}

entry()