import { field, logger } from "@coder/logger"
import http from "http"
import * as os from "os"
import path from "path"
import { Disposable } from "../common/emitter"
import { plural } from "../common/util"
import { createApp, ensureAddress } from "./app"
import { AuthType, DefaultedArgs, Feature, UserProvidedArgs } from "./cli"
import { coderCloudBind } from "./coder_cloud"
import { commit, version } from "./constants"
import { register } from "./routes"
import { humanPath, isFile, loadAMDModule, open } from "./util"

/**
 * Return true if the user passed an extension-related VS Code flag.
 */
export const shouldSpawnCliProcess = (args: UserProvidedArgs): boolean => {
  return (
    !!args["list-extensions"] ||
    !!args["install-extension"] ||
    !!args["uninstall-extension"] ||
    !!args["locate-extension"]
  )
}

/**
 * This is useful when an CLI arg should be passed to VS Code directly,
 * such as when managing extensions.
 * @deprecated This should be removed when code-server merges with lib/vscode.
 */
export const runVsCodeCli = async (args: DefaultedArgs): Promise<void> => {
  logger.debug("Running VS Code CLI")

  // See ../../vendor/modules/code-oss-dev/src/vs/server/main.js.
  const spawnCli = await loadAMDModule<CodeServerLib.SpawnCli>("vs/server/remoteExtensionHostAgent", "spawnCli")

  try {
    await spawnCli({
      ...args,
      /** Type casting. */
      "accept-server-license-terms": true,
      help: !!args.help,
      version: !!args.version,
      port: args.port?.toString(),
    })
  } catch (error: any) {
    logger.error("Got error from VS Code", error)
  }

  process.exit(0)
}

export const openInExistingInstance = async (args: DefaultedArgs, socketPath: string): Promise<void> => {
  const pipeArgs: CodeServerLib.OpenCommandPipeArgs & { fileURIs: string[] } = {
    type: "open",
    folderURIs: [],
    fileURIs: [],
    forceReuseWindow: args["reuse-window"],
    forceNewWindow: args["new-window"],
  }
  const paths = args._ || []
  for (let i = 0; i < paths.length; i++) {
    const fp = path.resolve(paths[i])
    if (await isFile(fp)) {
      pipeArgs.fileURIs.push(fp)
    } else {
      pipeArgs.folderURIs.push(fp)
    }
  }
  if (pipeArgs.forceNewWindow && 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.length === 0) {
    logger.error("Please specify at least one file or folder")
    process.exit(1)
  }
  const vscode = http.request(
    {
      path: "/",
      method: "POST",
      socketPath,
    },
    (response) => {
      response.on("data", (message) => {
        logger.debug("got message from VS Code", field("message", message.toString()))
      })
    },
  )
  vscode.on("error", (error: unknown) => {
    logger.error("got error from VS Code", field("error", error))
  })
  vscode.write(JSON.stringify(pipeArgs))
  vscode.end()
}

export const runCodeServer = async (
  args: DefaultedArgs,
): Promise<{ dispose: Disposable["dispose"]; server: http.Server }> => {
  logger.info(`code-server ${version} ${commit}`)

  logger.info(`Using user-data-dir ${humanPath(os.homedir(), args["user-data-dir"])}`)
  logger.trace(`Using extensions-dir ${humanPath(os.homedir(), args["extensions-dir"])}`)

  if (args.auth === AuthType.Password && !args.password && !args["hashed-password"]) {
    throw new Error(
      "Please pass in a password via the config file or environment variable ($PASSWORD or $HASHED_PASSWORD)",
    )
  }

  const app = await createApp(args)
  const protocol = args.cert ? "https" : "http"
  const serverAddress = ensureAddress(app.server, protocol)
  const disposeRoutes = await register(app, args)

  logger.info(`Using config file ${humanPath(os.homedir(), args.config)}`)
  logger.info(
    `${protocol.toUpperCase()} server listening on ${serverAddress.toString()} ${
      args.link ? "(randomized by --link)" : ""
    }`,
  )

  if (args.auth === AuthType.Password) {
    logger.info("  - Authentication is enabled")
    if (args.usingEnvPassword) {
      logger.info("    - Using password from $PASSWORD")
    } else if (args.usingEnvHashedPassword) {
      logger.info("    - Using password from $HASHED_PASSWORD")
    } else {
      logger.info(`    - Using password from ${humanPath(os.homedir(), args.config)}`)
    }
  } else {
    logger.info(`  - Authentication is disabled ${args.link ? "(disabled by --link)" : ""}`)
  }

  if (args.cert) {
    logger.info(`  - Using certificate for HTTPS: ${humanPath(os.homedir(), args.cert.value)}`)
  } else {
    logger.info(`  - Not serving HTTPS ${args.link ? "(disabled by --link)" : ""}`)
  }

  if (args["proxy-domain"].length > 0) {
    logger.info(`  - ${plural(args["proxy-domain"].length, "Proxying the following domain")}:`)
    args["proxy-domain"].forEach((domain) => logger.info(`    - *.${domain}`))
  }

  if (args.link) {
    await coderCloudBind(serverAddress, args.link.value)
    logger.info("  - Connected to cloud agent")
  }

  if (args.enable && args.enable.length > 0) {
    logger.info("Enabling the following experimental features:")
    args.enable.forEach((feature) => {
      if (Object.values(Feature).includes(feature as Feature)) {
        logger.info(`  - "${feature}"`)
      } else {
        logger.error(`  X "${feature}" (unknown feature)`)
      }
    })
    // TODO: Could be nice to add wrapping to the logger?
    logger.info(
      "  The code-server project does not provide stability guarantees or commit to fixing bugs relating to these experimental features. When filing bug reports, please ensure that you can reproduce the bug with all experimental features turned off.",
    )
  }

  if (args.open) {
    try {
      await open(serverAddress)
      logger.info(`Opened ${serverAddress}`)
    } catch (error) {
      logger.error("Failed to open", field("address", serverAddress.toString()), field("error", error))
    }
  }

  return {
    server: app.server,
    dispose: async () => {
      disposeRoutes()
      await app.dispose()
    },
  }
}