const SimpleGit = require("simple-git");
const simpleGits = [];
const fs = require("fs");
const path = require("path");
const defaultModules = require(__dirname + "/../defaultmodules.js");
const Log = require(__dirname + "/../../../js/logger.js");
const NodeHelper = require("node_helper");

module.exports = NodeHelper.create({
	config: {},

	updateTimer: null,
	updateProcessStarted: false,

	start: function () {},

	configureModules: function (modules) {
		// Push MagicMirror itself , biggest chance it'll show up last in UI and isn't overwritten
		// others will be added in front
		// this method returns promises so we can't wait for every one to resolve before continuing
		simpleGits.push({ module: "default", git: SimpleGit(path.normalize(__dirname + "/../../../")) });

		var promises = [];

		for (var moduleName in modules) {
			if (!this.ignoreUpdateChecking(moduleName)) {
				// Default modules are included in the main MagicMirror repo
				var moduleFolder = path.normalize(__dirname + "/../../" + moduleName);

				try {
					Log.info("Checking git for module: " + moduleName);
					let stat = fs.statSync(path.join(moduleFolder, ".git"));
					promises.push(this.resolveRemote(moduleName, moduleFolder));
				} catch (err) {
					// Error when directory .git doesn't exist
					// This module is not managed with git, skip
					continue;
				}
			}
		}

		return Promise.all(promises);
	},

	socketNotificationReceived: function (notification, payload) {
		if (notification === "CONFIG") {
			this.config = payload;
		} else if (notification === "MODULES") {
			// if this is the 1st time thru the update check process
			if (!this.updateProcessStarted) {
				this.updateProcessStarted = true;
				this.configureModules(payload).then(() => this.performFetch());
			}
		}
	},

	resolveRemote: function (moduleName, moduleFolder) {
		return new Promise((resolve, reject) => {
			var git = SimpleGit(moduleFolder);
			git.getRemotes(true, (err, remotes) => {
				if (remotes.length < 1 || remotes[0].name.length < 1) {
					// No valid remote for folder, skip
					return resolve();
				}
				// Folder has .git and has at least one git remote, watch this folder
				simpleGits.unshift({ module: moduleName, git: git });
				resolve();
			});
		});
	},

	performFetch: function () {
		var self = this;
		simpleGits.forEach((sg) => {
			sg.git.fetch(["--dry-run"]).status((err, data) => {
				data.module = sg.module;
				if (!err) {
					sg.git.log({ "-1": null }, (err, data2) => {
						if (!err && data2.latest && "hash" in data2.latest) {
							data.hash = data2.latest.hash;
							self.sendSocketNotification("STATUS", data);
						}
					});
				}
			});
		});

		this.scheduleNextFetch(this.config.updateInterval);
	},

	scheduleNextFetch: function (delay) {
		if (delay < 60 * 1000) {
			delay = 60 * 1000;
		}

		var self = this;
		clearTimeout(this.updateTimer);
		this.updateTimer = setTimeout(function () {
			self.performFetch();
		}, delay);
	},

	ignoreUpdateChecking: function (moduleName) {
		// Should not check for updates for default modules
		if (defaultModules.indexOf(moduleName) >= 0) {
			return true;
		}

		// Should not check for updates for ignored modules
		if (this.config.ignoreModules.indexOf(moduleName) >= 0) {
			return true;
		}

		// The rest of the modules that passes should check for updates
		return false;
	}
});