/**
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-extra");
const https = require('follow-redirects').https;
const factorioAPI = require("node-factorio-api");
const sLog = require("single-line-log").stdout;
const query = require('cli-interact').getYesNo;

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


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]};


module.exports = function(config){
	if(!config) config = require("./../../config");
	const instances = require("./../getInstances.js")(config).sync();
	return {
		/**
		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")(config);
		modManager.listMods("testInstance");
		// console.logs table of mods installed on instance
		modManager.listMods("shared");
		// console.logs mods located in /sharedMods as a nice table
		*/
		listMods: function(instance){
			return new Promise((resolve, reject) => {
				if(instance && instances.includes(instance)){
					factorioAPI.init(false, config.instanceDirectory+'/'+instance+'/instanceMods', config.instanceDirectory+'/'+instance+'/saves', config.factorio_version);
					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");
						resolve();
					});
				} else {
					// list shared mods in /sharedMods/
					factorioAPI.init(false, 'sharedMods/', '', config.factorio_version);
					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));
							resolve();
						});
					}).catch(e => {
						reject(new Error(e));
					});
				}
				
				// 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
		*/
		findMods: function(searchTerm){
			return new Promise((resolve, reject) => {
				factorioAPI.init(false);
				factorioAPI.authenticate({
					username: config.username,
					token: config.token,
					require_ownership: false
				}).then(token => {
					factorioAPI.searchMods(searchTerm).then(mods => {
						let result = 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"),
								latest_version: mod.latest_release.version,
								owner:mod.owner,
								//license: mod.license_name,
							}
						}));
						resolve(result);
						// console.log(result);
					});
				}).catch(e => {
					if(e.contains("Insufficient information")) console.log("We are missing some parameters required for logging in! Make sure your factorio username and token are specified in config.json.");
					reject(new Error(e));
				});
			});
		},
		addMod: function(term, instance){
			return new Promise((resolve, reject) => {
				if(instance == "shared"){ // modDirectory has to end in /
					var modDirectory = "sharedMods/";
				} else {
				var modDirectory = config.instanceDirectory+"/"+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, "", config.factorio_version);
						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 + " in version: " + body[0].latest_release.version);
								factorioAPI.downloadMod( {name: body[0].name, version: body[0].latest_release.version}).then(()=>{
									console.log("Mod downloaded");
									resolve();
								});
							});
						});
					} 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
									resolve();
								});
							});
						}
					} else {
						// treat it as a search and download the top result
						factorioAPI.init(false, modDirectory, "", config.factorio_version);
						factorioAPI.authenticate({
							username: config.username,
							token: config.token,
							require_ownership: false
						}).then(() => {
							factorioAPI.searchMods(term).then(body => {
								console.log(body)
								console.log("Im gonna download: "+body[0].name + " in version: " + body[0].latest_release.version);
								factorioAPI.downloadMod( {name: body[0].name, version: body[0].latest_release.version}).then(()=>{
									console.log("Mod downloaded");
									resolve();
								});
							});
						});
					}
				} else {
					reject(new Error("Invalid search term"));
				}
			});
		},
		removeMod: function removeMod(term, instance, force = false){
			return new Promise((resolve, reject) => {
				if(instance == "shared"){ // modDirectory has to end in /
					var modDirectory = "sharedMods/";
				} else {
				var modDirectory = config.instanceDirectory+"/"+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");
						modsMatchingFilter.forEach(mod => console.log(mod));
						if(query("Delete all mods matching filter?")){
							let modsToDelete = modsMatchingFilter.length;
							for(let i = 0; i < modsToDelete; i++){
								fs.unlinkSync(modDirectory+modsMatchingFilter[i]);
								console.log("Deleted "+modsMatchingFilter[i]);
							}
						} else console.log("Did not delete mods.")
					}
					resolve();
				} else {
					reject(new Error("Invalid search term"));
				}
			});
		},

		// '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
		*/
		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()))
}*/