const { app, BrowserWindow, ipcMain, net, protocol, screen, shell } = require('electron');
const fs = require('node:fs');
const path = require('node:path');
const { pathToFileURL } = require('node:url');

const APP_SCHEME = 'ydevent';
const API_ENVIRONMENTS = {
	test: {
		label: '测试服',
		origin: process.env.ELECTRON_TEST_API_URL || 'http://8.153.108.90:9996',
	},
	production: {
		label: '正式服',
		origin: process.env.ELECTRON_PRODUCTION_API_URL || process.env.ELECTRON_API_URL || 'https://event.yuedongsports.com',
	},
};

let selectedApiEnvironment = process.env.ELECTRON_API_ENV === 'test' ? 'test' : 'production';
let mainWindow = null;
let presentationWindow = null;

const environmentConfigPath = () => path.join(app.getPath('userData'), 'environment.json');

const loadApiEnvironment = () => {
	try {
		const saved = JSON.parse(fs.readFileSync(environmentConfigPath(), 'utf8'));
		if (API_ENVIRONMENTS[saved.environment]) selectedApiEnvironment = saved.environment;
	} catch {
		// 首次运行时使用默认环境。
	}
};

const saveApiEnvironment = (environment) => {
	fs.mkdirSync(path.dirname(environmentConfigPath()), { recursive: true });
	fs.writeFileSync(environmentConfigPath(), JSON.stringify({ environment }, null, 2), 'utf8');
};

const apiEnvironmentState = () => ({
	current: selectedApiEnvironment,
	environments: Object.entries(API_ENVIRONMENTS).map(([value, item]) => ({ value, label: item.label, origin: item.origin })),
});

protocol.registerSchemesAsPrivileged([
	{
		scheme: APP_SCHEME,
		privileges: {
			standard: true,
			secure: true,
			supportFetchAPI: true,
			corsEnabled: true,
			stream: true,
		},
	},
]);

const registerAppProtocol = () => {
	const rendererDirectory = path.resolve(__dirname, '..', 'dist');

	protocol.handle(APP_SCHEME, async (request) => {
		const requestUrl = new URL(request.url);

		if (requestUrl.pathname === '/api' || requestUrl.pathname.startsWith('/api/')) {
			const apiOrigin = API_ENVIRONMENTS[selectedApiEnvironment].origin;
			const targetUrl = new URL(`${requestUrl.pathname}${requestUrl.search}`, apiOrigin);
			const options = {
				method: request.method,
				headers: request.headers,
			};

			if (request.method !== 'GET' && request.method !== 'HEAD') {
				options.body = request.body;
				options.duplex = 'half';
			}

			return net.fetch(targetUrl.toString(), options);
		}

		const pathname = decodeURIComponent(requestUrl.pathname);
		const requestedPath = pathname === '/' ? 'index.html' : pathname.replace(/^\/+/, '');
		let filePath = path.resolve(rendererDirectory, requestedPath);

		if (!filePath.startsWith(`${rendererDirectory}${path.sep}`) && filePath !== rendererDirectory) {
			return new Response('Not found', { status: 404 });
		}

		if (!path.extname(filePath)) {
			filePath = path.join(rendererDirectory, 'index.html');
		}

		return net.fetch(pathToFileURL(filePath).toString());
	});
};

const targetPresentationDisplay = () => {
	const displays = screen.getAllDisplays();
	if (!mainWindow || displays.length < 2) return displays[0] || screen.getPrimaryDisplay();
	const operatorDisplay = screen.getDisplayMatching(mainWindow.getBounds());
	return displays.find((display) => display.id !== operatorDisplay.id) || operatorDisplay;
};

const positionPresentationWindow = () => {
	if (!presentationWindow || presentationWindow.isDestroyed()) return;
	const targetDisplay = targetPresentationDisplay();
	const currentDisplay = screen.getDisplayMatching(presentationWindow.getBounds());
	if (currentDisplay.id !== targetDisplay.id) {
		presentationWindow.setFullScreen(false);
		presentationWindow.setBounds(targetDisplay.bounds);
	}
	if (!presentationWindow.isFullScreen()) presentationWindow.setFullScreen(true);
};

const openPresentationWindow = async (rawUrl) => {
	const baseUrl = mainWindow?.webContents.getURL() || `${APP_SCHEME}://app/index.html`;
	const targetUrl = new URL(rawUrl, baseUrl);
	const isAppUrl = targetUrl.protocol === `${APP_SCHEME}:`;
	const isDevUrl = !app.isPackaged && ['127.0.0.1', 'localhost'].includes(targetUrl.hostname);
	if (!isAppUrl && !isDevUrl) throw new Error('不允许在投屏窗口中打开外部地址');

	if (!presentationWindow || presentationWindow.isDestroyed()) {
		const display = targetPresentationDisplay();
		presentationWindow = new BrowserWindow({
			x: display.bounds.x,
			y: display.bounds.y,
			width: display.bounds.width,
			height: display.bounds.height,
			frame: false,
			fullscreen: true,
			autoHideMenuBar: true,
			show: false,
			backgroundColor: '#020936',
			webPreferences: {
				preload: path.join(__dirname, 'preload.cjs'),
				contextIsolation: true,
				nodeIntegration: false,
				sandbox: true,
			},
		});
		presentationWindow.on('closed', () => {
			presentationWindow = null;
		});
		presentationWindow.once('ready-to-show', () => presentationWindow?.showInactive());
	} else {
		positionPresentationWindow();
	}

	await presentationWindow.loadURL(targetUrl.toString());
	presentationWindow.setFullScreen(true);
	presentationWindow.showInactive();
	return { opened: true, displayId: targetPresentationDisplay().id };
};

const registerIpcHandlers = () => {
	ipcMain.handle('app:get-api-environment', () => apiEnvironmentState());
	ipcMain.handle('app:set-api-environment', (_event, environment) => {
		if (!API_ENVIRONMENTS[environment]) throw new Error('未知接口环境');
		selectedApiEnvironment = environment;
		saveApiEnvironment(environment);
		if (presentationWindow && !presentationWindow.isDestroyed()) presentationWindow.reload();
		return apiEnvironmentState();
	});
	ipcMain.handle('presentation:open', (_event, url) => openPresentationWindow(url));
};

const createWindow = () => {
	mainWindow = new BrowserWindow({
		width: 1440,
		height: 900,
		minWidth: 1100,
		minHeight: 700,
		show: false,
		autoHideMenuBar: true,
		icon: path.join(__dirname, '..', 'public', 'app.ico'),
		webPreferences: {
			preload: path.join(__dirname, 'preload.cjs'),
			contextIsolation: true,
			nodeIntegration: false,
			sandbox: true,
		},
	});

	mainWindow.once('ready-to-show', () => mainWindow?.show());

	mainWindow.webContents.setWindowOpenHandler(({ url }) => {
		if (url.startsWith('http://') || url.startsWith('https://')) {
			void shell.openExternal(url);
		}
		return { action: 'deny' };
	});

	if (app.isPackaged) {
		void mainWindow.loadURL(`${APP_SCHEME}://app/index.html`);
	} else {
		void mainWindow.loadURL(process.env.VITE_DEV_SERVER_URL || 'http://127.0.0.1:9991');
		mainWindow.webContents.openDevTools({ mode: 'detach' });
	}

	mainWindow.on('closed', () => {
		if (presentationWindow && !presentationWindow.isDestroyed()) presentationWindow.close();
		mainWindow = null;
	});
};

app.whenReady().then(() => {
	loadApiEnvironment();
	registerAppProtocol();
	registerIpcHandlers();
	createWindow();

	app.on('activate', () => {
		if (BrowserWindow.getAllWindows().length === 0) createWindow();
	});
});

app.on('window-all-closed', () => {
	if (process.platform !== 'darwin') app.quit();
});