const path = require("path");
const fs = require("fs");
const packageJSON = require("../package.json");
const fetch = require("node-fetch");
const decompress = require("decompress");
const os = require("os");
const del = require("del");

const downloadDaemon = targetPlatform =>
  new Promise((resolve, reject) => {
    const daemonURLTemplate = packageJSON.lbrySettings.lbrynetDaemonUrlTemplate;
    const daemonVersion = packageJSON.lbrySettings.lbrynetDaemonVersion;
    const daemonDir = path.join(__dirname, "..", packageJSON.lbrySettings.lbrynetDaemonDir);
    let daemonFileName = packageJSON.lbrySettings.lbrynetDaemonFileName;

    let currentPlatform = os.platform();

    var daemonPlatform = process.env.TARGET || targetPlatform || currentPlatform;
    if (daemonPlatform === "mac" || daemonPlatform === "darwin") daemonPlatform = "mac";
    if (daemonPlatform === "win32" || daemonPlatform === "windows") {
      daemonPlatform = "windows";
      daemonFileName = daemonFileName + ".exe";
    }
    const daemonFilePath = path.join(daemonDir, daemonFileName);
    const daemonVersionPath = path.join(__dirname, "daemon.ver");
    const tmpZipPath = path.join(__dirname, "..", "dist", "daemon.zip");
    const daemonURL = daemonURLTemplate.replace(/DAEMONVER/g, daemonVersion).replace(/OSNAME/g, daemonPlatform);

    // If a daemon and daemon.ver exists, check to see if it matches the current daemon version
    const hasDaemonDownloaded = fs.existsSync(daemonFilePath);
    const hasDaemonVersion = fs.existsSync(daemonVersionPath);
    let downloadedDaemonVersion;
    if (hasDaemonVersion) {
      downloadedDaemonVersion = fs.readFileSync(daemonVersionPath, "utf8");
    }

    if (hasDaemonDownloaded && hasDaemonVersion && downloadedDaemonVersion === daemonVersion) {
      console.log("\x1b[34minfo\x1b[0m Daemon already downloaded");
      resolve("Done");
      return;
    } else {
      console.log("\x1b[34minfo\x1b[0m Downloading daemon...");
      fetch(daemonURL, {
        method: "GET",
        headers: {
          "Content-Type": "application/zip"
        }
      })
        .then(response => response.buffer())
        .then(
          result =>
            new Promise((newResolve, newReject) => {
              const distPath = path.join(__dirname, "..", "dist");
              const hasDistFolder = fs.existsSync(distPath);

              if (!hasDistFolder) {
                fs.mkdirSync(distPath);
              }

              fs.writeFile(tmpZipPath, result, error => {
                if (error) return newReject(error);
                return newResolve();
              });
            })
        )
        .then(() => del(`${daemonFilePath}*`))
        .then(() =>
          decompress(tmpZipPath, daemonDir, {
            filter: file => path.basename(file.path) === daemonFileName
          })
        )
        .then(() => {
          console.log("\x1b[32msuccess\x1b[0m Daemon downloaded!");
          if (hasDaemonVersion) {
            del(daemonVersionPath);
          }

          fs.writeFileSync(daemonVersionPath, daemonVersion, "utf8");
          resolve("Done");
        })
        .catch(error => {
          console.error(`\x1b[31merror\x1b[0m Daemon download failed due to: \x1b[35m${error}\x1b[0m`);
          reject(error);
        });
    }
  });

downloadDaemon();