/**
Provides tools to manage mods in a clusterio install
@module modManager
*/

const rightpad = require("right-pad");
const asTable = require("as-table").configure({delimiter: ' | '});
const moment = require("moment");
const syncRequest = require("sync-request");
const fs = require("fs");
const https = require('follow-redirects').https;
const factorioAPI = require("node-factorio-api");
const sLog = require("single-line-log").stdout;

const fileOps = require("_app/fileOps");
const config = require("./../../config");

const instances = require("./../getInstances.js").sync();

function ellipse(str, max){
   return str.length > (max - 3) ? str.substring(0,max-3) + '...' : str;
}
// https://stackoverflow.com/questions/15900485/correct-way-to-convert-size-in-bytes-to-kb-mb-gb-in-javascript
function formatBytes(a,b){if(0==a)return"0 Bytes";var c=1024,d=b||2,e=["Bytes","KB","MB","GB","TB","PB","EB","ZB","YB"],f=Math.floor(Math.log(a)/Math.log(c));return parseFloat((a/Math.pow(c,f)).toFixed(d))+" "+e[f]};

/**
Lists mods for an instance as a table. Warning, handles printing internally.
@param {string} instance - Name of the instance or "shared"

@example
var modManager = require("modManager");
modManager.listMods("testInstance");
// console.logs table of mods installed on instance
modManager.listMods("shared");
// console.logs mods located in /sharedMods as a nice table
*/
module.exports.listMods = function(instance){
	if(instance && instances.includes(instance)){
		factorioAPI.init(false, 'instances/'+instance+'/instanceMods', 'instances/'+instance+'/saves', '0.16.15');
		factorioAPI.authenticate({
			username: config.username,
			token: config.token,
			require_ownership: false
		}).then(token => {
			console.log("* Currently installed:");
			factorioAPI.readModZips().then(list => {
				console.log(asTable(list.map(mod => {
					return {
						name:(mod.title || mod.name),
						version:mod.version,
						date:mod.date,
						factorio_ver:mod.factorio_version,
						author:mod.author,
					}
				})));
			});
			// Had issues earlier due to bug in node-factorio-api, see https://github.com/Danacus/node-factorio-api/issues/2
			// bug is resolved, thanks to @Danacus and @brotherpot
			factorioAPI.getModsFromSaves().then(list => {
				console.log("* Mods used in save:");
				console.log(asTable(list[0].mods))
			});
		}).catch(reason => {
			console.log("Failed to authenticate to factorio.com! Please check your connection and the username+token used for authentication in config.json");
		});
	} else {
		// list shared mods in /sharedMods/
		factorioAPI.init(false, 'sharedMods/', '', '0.16.15');
		factorioAPI.authenticate({
			username: config.username,
			token: config.token,
			require_ownership: false
		}).then(() => {
			console.log("\r\n")
			console.log("* Mods shared by all instances:")
			factorioAPI.getInstalledMods().then(mods => {
				console.log(asTable(mods));
			});
		});
	}
	
	// get JSON data about GH releases
	/*let res = syncRequest('GET', 'https://api.github.com/repos/Danielv123/factorioClusterioMod/releases', {"headers":{"User-Agent":"Fuck you for requiring user agents!"}});
	let url = JSON.parse(res.getBody())[0].assets[0].browser_download_url;
	let name = JSON.parse(res.getBody())[0].assets[0].name;
	console.log(JSON.parse(res.getBody()))
	*/
}
/**
Searches mods.factorio.com for mods matching a search term and prints
the results to console as a neat looking table

@param {string} searchTerm What to search for
*/
module.exports.findMods = function(searchTerm){
	factorioAPI.init(false);
	factorioAPI.authenticate({
		username: config.username,
		token: config.token,
		require_ownership: false
	}).then(token => {
		factorioAPI.searchMods(searchTerm).then(mods => {
			console.log(asTable(mods.reverse().map(mod => {
				return {
					title:ellipse(mod.title, 50),
					name:ellipse(mod.name, 30),
					downloads:mod.downloads_count,
					updated: moment(mod.updated_at).format("DD.MM.YY"),
					owner:mod.owner,
					//license: mod.license_name,
				}
			})))
		})
	});
}

module.exports.addMod = function(term, instance){
	if(instance == "shared"){ // modDirectory has to end in /
		var modDirectory = "sharedMods/";
	} else {
		var modDirectory = "instances/"+instance+"/instanceMods/";
	}
	if(term && term.length > 0){
		if(term.includes("mods.factorio.com/mods/")){ // https://mods.factorio.com/mods/Danielv123/ChooChoo
			// treat it as a link download
			factorioAPI.init(false, modDirectory, "", "0.16.15");
			factorioAPI.authenticate({
				username: config.username,
				token: config.token,
				require_ownership: false
			}).then(() => {
				factorioAPI.searchMods(term.split("/")[term.split("/").length-1]).then(body => {
					console.log("Im gonna download: "+body[0].name);
					factorioAPI.downloadMod(body[0]).then(()=>{
						console.log("Mod downloaded");
					});
				});
			});
		} else if(term.includes("github.com")){ // https://github.com/Danielv123/factorioClusterioMod
			// treat it as a github releases download
			let apiURL = "https://api.github.com/repos/" + term.split("/")[3] + "/" + term.split("/")[4] + "/releases"; // https://api.github.com/repos/Danielv123/factorioClusterioMod/releases
			
			let res = syncRequest('GET', apiURL, {"headers":{"User-Agent":"Fuck you for requiring user agents!"}});
			let url = JSON.parse(res.getBody())[0].assets[0].browser_download_url;
			let name = JSON.parse(res.getBody())[0].assets[0].name;
			if(url) {
				console.log("Downloading " + url);
				let file = fs.createWriteStream(modDirectory + name);
				let bytesDownloaded = 0;
				let downloadStartTime = Date.now();
				https.get(url, function(response) {
					let bytesToDownload = response.headers['content-length'];
					response.pipe(file);
					response.on("data", chunk => {
						bytesDownloaded += chunk.length;
						let downloadTimeElapsed = Date.now() - downloadStartTime;
						let bytesPerSecond = bytesDownloaded / (downloadTimeElapsed/1000);
						let timeToComplete = Math.floor((bytesToDownload - bytesDownloaded)/bytesPerSecond);
						sLog("Downloading "+name+" "+(bytesDownloaded/bytesToDownload*100).toPrecision(3)+"% ("+formatBytes(bytesDownloaded)+" / "+formatBytes(bytesToDownload)+")\r\n"+
						"about "+timeToComplete+" seconds remaining ("+formatBytes(bytesPerSecond)+"/s)");
					}).on("end", x => {
						sLog.clear();
						console.log(" Downloaded in "+moment.utc(moment.duration(Date.now()-downloadStartTime).as('milliseconds')).format('mm:ss')); // because sLog.clear() doesn't seem to do the job of ending the line properly
					});
				});
			}
		} else {
			// treat it as a search and download the top result
			factorioAPI.init(false, modDirectory, "", "0.16.15");
			factorioAPI.authenticate({
				username: config.username,
				token: config.token,
				require_ownership: false
			}).then(() => {
				factorioAPI.searchMods(term).then(body => {
					console.log("Im gonna download: "+body[0].name);
					factorioAPI.downloadMod(body[0]).then(()=>{
						console.log("Mod downloaded");
					});
				});
			});
		}
	}
}
module.exports.removeMod = function removeMod(term, instance, force = false){
	if(instance == "shared"){ // modDirectory has to end in /
		var modDirectory = "sharedMods/";
	} else {
		var modDirectory = "instances/"+instance+"/instanceMods/";
	}
	if(term && typeof term == "string" && term.length > 0){
		let mods = fs.readdirSync(modDirectory);
		let modsMatchingFilter = mods.filter(mod => mod.toLowerCase().includes(term.toLowerCase()));
		if(modsMatchingFilter.length < 1){
			console.log("No mods found matching search");
		} else if(modsMatchingFilter.length == 1){
			console.log("Deleting "+modsMatchingFilter[0]);
			fs.unlinkSync(modDirectory+modsMatchingFilter[0]);
			console.log("Deleted.");
		} else if(modsMatchingFilter.length > 1){
			console.log("Found multiple mods, not doing anything");
			modsMatchingFilter.forEach(mod => console.log(mod));
		}
	}
}

// 'https://api.github.com/repos/Danielv123/factorioClusterioMod/releases'
/**
Download mod from github repo by looking for the first binary download in
the latest release, saving it to /sharedMods

@param {string} url a github repo  URL, for example https://api.github.com/repos/Danielv123/factorioClusterioMod/releases. Must link to /releases
*/
module.exports.downloadFromGitURL = function(url){
	console.log("Downloading mod from "+url);
	// get JSON data about releases
	let res = syncRequest('GET', url, {"headers":{"User-Agent":"Please don't require setting a user agent"}});
	let downloadUrl = JSON.parse(res.getBody())[0].assets[0].browser_download_url;
	let name = JSON.parse(res.getBody())[0].assets[0].name;
	console.log(JSON.parse(res.getBody()))
	if(downloadUrl) {
		console.log(downloadUrl);
		let file = fs.createWriteStream("sharedMods/"+name);
		https.get(downloadUrl, function(response) {
			response.pipe(file);
			console.log("Downloaded "+name);
		});
	}
}
/*
module.exports.findUpdates = function(){
	console.log("Downloading mods...");
	// get JSON data about releases
	let res = syncRequest('GET', 'https://api.github.com/repos/Danielv123/factorioClusterioMod/releases', {"headers":{"User-Agent":"Fuck you for requiring user agents!"}});
	let url = JSON.parse(res.getBody())[0].assets[0].browser_download_url;
	let name = JSON.parse(res.getBody())[0].assets[0].name;
	console.log(JSON.parse(res.getBody()))
}*/