const path = require("node:path");
const fs = require("node:fs");
const https = require("node:https");
const process = require("node:process");
const os = require("node:os");
const child_process = require("node:child_process");
const electron = require("electron");

const update = require(path.join(__dirname, "update.js"));

let configFilePath;
let plutoniumInstallDirectory;
switch (os.platform()) {
	case "win32":
		configFilePath = path.join(process.env["LOCALAPPDATA"], "Plutonium", "open-plutonium-launcher.json");
		plutoniumInstallDirectory = path.join(process.env["LOCALAPPDATA"], "Plutonium");
		break;
	case "linux":
		configFilePath = path.join(os.userInfo().homedir, ".config", "open-plutonium-launcher.json");
		plutoniumInstallDirectory = path.join(os.userInfo().homedir, ".local", "share", "Plutonium");
		break;
	case "darwin":
		configFilePath = path.join(os.userInfo().homedir, "Library", "Application Support", "open-plutonium-launcher.json");
		plutoniumInstallDirectory = path.join(os.userInfo().homedir, "Library", "Application Support", "Plutonium");
		break;
	default:
		electron.dialog.showErrorBox("Incompatible system", "Sorry, your operating system doesn't seem to be supported...");
		process.exit(1);
}

let mainWindow;
let plutoniumManifest = {
	"product": "plutonium-core-prod",
	"revision": -1,
	"baseUrl": "https://cdn.plutonium.pw/updater/prod/files/",
	"files": []
};
let userInfo = {
	"token": "V3ryS3cr3t4uth3nt1c4t10nT0k3n",
	"userId": -1,
	"username": "AnonGuest",
	"email": "guest@neverla.nd",
	"emailVerified": false,
	"avatar": "https://forum.plutonium.pw/assets/uploads/system/avatar-default.png"
};

function createMainWindow() {
	mainWindow = new electron.BrowserWindow({
		"minWidth": 640,
		"minHeight": 480,
		"width": 800,
		"height": 600,
		"fullscreenable": false,
		"show": false,
		"webPreferences": {
			"preload": path.join(__dirname, "preload.js"),
			"contextIsolation": true
		}
	});

	mainWindow.loadFile(path.join(__dirname, "views", "login.html"));

	mainWindow.once("ready-to-show", function () {
		mainWindow.show();
	});
}

function fetchPlutoniumManifest() {
	return new Promise(function (resolve, reject) {
		let request = https.request("https://cdn.plutonium.pw/updater/prod/info.json", {
			"method": "GET"
		}, function (response) {
			if (response.statusCode !== 200) {
				return reject(new Error("Failed to fetch the Plutonium launcher manifest."));
			}

			response.setEncoding("utf-8");

			let body = "";
			response.on("data", function (chunk) {
				body += chunk;
			});
			response.on("end", function () {
				try {
					let data = JSON.parse(body);

					resolve(data);
				} catch (error) {
					reject(error);
				}
			});
		});

		request.on("error", function (error) {
			reject(error);
		});

		request.end();
	});
}

function getPlutoniumSession(game, token) {
	return new Promise(function (resolve, reject) {
		let payload = JSON.stringify({
			"game": game
		});

		let request = https.request("https://nix.plutonium.pw/api/auth/session", {
			"method": "POST",
			"headers": {
				"Content-Type": "application/json",
				"Content-Length": payload.length,
				"Authorization": "UserToken " + token,
				"X-Plutonium-Revision": String(plutoniumManifest.revision),
				"User-Agent": "Nix/3.0"
			}
		}, function (response) {
			if (response.statusCode !== 200) {
				return resolve({
					"status": "unauthenticated",
					"successful": false
				});
			}

			response.setEncoding("utf-8");

			let body = "";
			response.on("data", function (chunk) {
				body += chunk;
			});
			response.on("end", function () {
				try {
					let data = JSON.parse(body);

					if (!("token" in data)) {
						reject(new Error("Authentication seems to be successful but no token was returned."));
					}

					resolve({
						"status": "authenticated",
						"successful": true,
						...data
					});

					userInfo = data;

					mainWindow.loadFile(path.join(__dirname, "src", "views", "games.html"));
				} catch (error) {
					reject(error);
				}
			});
		});

		request.on("error", function (error) {
			reject(error);
		});

		request.write(payload);
		request.end();
	});
}

function launch(plutoniumInstallDirectory, game, gameInstallDirectory, online) {
	return new Promise(function (resolve, reject) {
		getPlutoniumSession(game, userInfo.token).then(function (data) {
			if (!data.successful) {
				return reject(new Error("Authentication has failed."));
			}

			let bootstrapperBinary = path.join(plutoniumInstallDirectory, "bin", "plutonium-bootstrapper-win32.exe");
			let bootstrapperArguments = [game, gameInstallDirectory];

			if (online) {
				bootstrapperArguments.push("-token");
				bootstrapperArguments.push(data.token);
			} else {
				bootstrapperArguments.push("+name");
				bootstrapperArguments.push(userInfo.username);
				bootstrapperArguments.push("-lan");
			}

			let gameProcess = child_process.spawn(bootstrapperBinary, bootstrapperArguments, {
				"detached": true,
				"stdio": "ignore"
			});

			gameProcess.on("spawn", function () {
				resolve(true);
			});
			gameProcess.on("error", function (error) {
				reject(error);
			});
		});
	});
}

electron.app.once("ready", function () {
	createMainWindow();
	fetchPlutoniumManifest().then(function (manifest) {
		plutoniumManifest = manifest;
	}).catch(function (error) {
		electron.dialog.showErrorBox("Error", "The Plutonium launcher manifest could not be fetched, auto-updating might not be possible.\n" + error.message);
	});
});

electron.app.on("window-all-closed", function () {
	electron.app.quit();
});

electron.ipcMain.handle("login", function (event, username, password) {
	return new Promise(function (resolve, reject) {
		let payload = JSON.stringify({
			"username": username,
			"password": password
		});

		let request = https.request("https://nix.plutonium.pw/api/auth/login", {
			"method": "POST",
			"headers": {
				"Content-Type": "application/json",
				"Content-Length": payload.length,
				"Authorization": "UserToken",
				"X-Plutonium-Revision": String(plutoniumManifest.revision),
				"User-Agent": "Nix/3.0"
			}
		}, function (response) {
			if (response.statusCode !== 200) {
				return resolve({
					"status": "unauthenticated",
					"successful": false
				});
			}

			response.setEncoding("utf-8");

			let body = "";
			response.on("data", function (chunk) {
				body += chunk;
			});
			response.on("end", function () {
				try {
					let data = JSON.parse(body);

					if (!("token" in data)) {
						reject(new Error("Login seems to be successful but no token was returned."));
					}

					resolve({
						"status": "authenticated",
						"successful": true,
						...data
					});

					userInfo = data;

					mainWindow.loadFile(path.join(__dirname, "src", "views", "games.html"));
				} catch (error) {
					reject(error);
				}
			});
		});

		request.on("error", function (error) {
			reject(error);
		});

		request.write(payload);
		request.end();
	});
});

electron.ipcMain.handle("launch", function (event, game, online = true) {
	return new Promise(function (resolve, reject) {
		if (!(game in config.gameDirectories)) {
			return resolve(false);
		}
		let gameInstallDirectory = config.gameDirectories[game];

		update.checkFiles(plutoniumManifest, plutoniumInstallDirectory).then(function (fileList) {
			let filesToUpdate = fileList.filter(function (file) {
				return !file.ok;
			});

			update.downloadFiles(plutoniumInstallDirectory, plutoniumManifest.baseUrl, filesToUpdate).then(function () {
				launch(plutoniumInstallDirectory, game, gameInstallDirectory, online).then(function (result) {
					resolve(result);
				});
			}).catch(function (error) {
				reject(error);
			});
		}).catch(function (error) {
			reject(error);
		});
	});
});