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, SpawnCodeCli, toCodeArgs, 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 copy of OpenCommandPipeArgs from
 * ../../lib/vscode/src/vs/workbench/api/node/extHostCLIServer.ts:15
 *
 * Arguments supported by Code's socket.  It can be used to perform actions from
 * the CLI in a running instance of Code (for example to open a file).
 *
 * TODO: Can we import this (and other types) directly?
 */
export interface OpenCommandPipeArgs {
  type: "open"
  fileURIs?: string[]
  folderURIs: string[]
  forceNewWindow?: boolean
  diffMode?: boolean
  addMode?: boolean
  gotoLineMode?: boolean
  forceReuseWindow?: boolean
  waitMarkerFilePath?: string
}

/**
 * Run Code's CLI for things like managing extensions.
 */
export const runCodeCli = async (args: DefaultedArgs): Promise<void> => {
  logger.debug("Running Code CLI")

  // See ../../lib/vscode/src/vs/server/node/server.main.ts:65.
  const spawnCli = await loadAMDModule<SpawnCodeCli>("vs/server/node/server.main", "spawnCli")

  try {
    await spawnCli(await toCodeArgs(args))
  } catch (error: any) {
    logger.error("Got error from Code", error)
  }

  process.exit(0)
}

export const openInExistingInstance = async (args: DefaultedArgs, socketPath: string): Promise<void> => {
  const pipeArgs: 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 Code", field("message", message.toString()))
      })
    },
  )
  vscode.on("error", (error: unknown) => {
    logger.error("got error from 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()
    },
  }
}