"use strict";

var fs = require("fs");
var fse = require("fs-extra");
var git = require("nodegit");
var dirTree = require("directory-tree");

let tmpDir = "./tmp";
let cloneDir = JSON.parse(fs.readFileSync("./package.json")).repository.url;

let ignore = [".git", "cfg.js", "updater.js"];

function skip() {
  return new Promise((resolve) => {
    fse.removeSync(tmpDir);
    console.log(`Skipped update to version ${newVersion}`);
    resolve();
  });
}

function updateProject() {
  return new Promise((resolve) => {
    let newFiles = dirTree("./tmp");
    recurse(newFiles.children);
    resolve();
  });
}

function recurse(parent) {
  for (let key in parent) {
    let name = parent[key].name;
    if (ignore.indexOf(name) > -1) continue;
    let isDir = parent[key].hasOwnProperty("children");
    try {
      if (!isDir) {
        fse.outputFileSync(parent[key].path.substring(4), fs.readFileSync(parent[key].path));
      }
      else {
        recurse(parent[key].children);
      }
    } catch (e) { console.log(e); }
  };
}

(function() {
  return new Promise((resolve) => {
    console.log("Preparing to update..");
    setTimeout(() => {
      fse.removeSync(tmpDir);
      let currentVersion = JSON.parse(fs.readFileSync("./package.json")).version;
      console.log(`Your current version is ${currentVersion}!`);
      setTimeout(() => {
        console.log("Fetching latest version..");
        git.Clone(cloneDir, tmpDir).then((res, rofl) => {
          let newVersion = null;
          try {
            newVersion = JSON.parse(fs.readFileSync(`${tmpDir}/package.json`)).version;
          } catch (e) {
            console.log("Version check failed!");
            return resolve();
          }
          if (currentVersion === newVersion) {
            console.log(`You are already running the latest version ${currentVersion}!`);
            skip().then(resolve);
            return void 0;
          }
          else if (currentVersion > newVersion) {
            console.log(`Your version ${currentVersion} is newer than ${newVersion}!`);
            skip().then(resolve);
            return void 0;
          }
          console.log(`Latest version is ${newVersion}`);
          console.log(`Updating to version ${newVersion}`);
          updateProject().then(() => {
            fse.removeSync(tmpDir);
            console.log("Update successfully completed, please restart!");
            resolve();
          });
        });
      }, 2e3);

    }, 1e3);
  });
})();