const cfgHandle = require("./configHandler");
const logger = require("./logger");
const parser = require("./packet-parser");
const frontend = require("./frontend");
const websocket = require("./ws-handler");
const crypt = require("./crypt");
const EventEmitter = require("events");
const net = require("net");
const fs = require("fs");
const path = require("path");

const { API } = require("./api");

class Server extends EventEmitter {
	constructor() {
		super();
		this.on("config.update", ({ oldConfig, newConfig }) => {});
	}

	run(address, port) {
		this.address = address;
		this.port = port;

		const wsPort = global.config.server?.staticInfo?.wsPort ?? 57891;
		const httpPort = global.config.server?.staticInfo?.httpPort ?? 49901;

		logger.log({
			wsPort,
			httpPort,
		});

		this.api = new API();

		if (global.config.server.useFrontend)
			this.frontend = frontend("127.0.0.1", httpPort);
		if (global.config.server.useWebSocketAPI)
			this.websocket = websocket("127.0.0.1", wsPort, this.api);

		this.server = net.createServer((srvSocket) => {
			srvSocket.on("error", (err) => {
				logger.log("Caught server socket error: ");
				logger.log(err.stack);
			});
		});

		function socketErrHanler(err) {
			if (err) {
				logger.log("Caught server socket error: ");
				logger.log(err.stack);
			}
		}

		function socketDataHandler(data, socket) {
			socket.write(data, function (err) {
				if (err) {
					logger.log(
						`error: ${socket.remoteAddress} (remote) throwed: ${err.name}\n${err.stack}`,
					);
				}
			});
		}

		this.server.on("connection", (socket) => {
			logger.log(`${socket.remoteAddress}${socket.remotePort} is connected`);
			socket.mainconnect = null;

			if (global.config.server.useWebSocketAPI) {
				socket.wsReverse = net.createConnection(wsPort, "127.0.0.1");
				socket.wsReverse.on("error", socketErrHanler);
				socket.wsReverse.on("data", (data) => socketDataHandler(data, socket));
			}
			if (global.config.server.useFrontend) {
				socket.httpReverse = net.createConnection(httpPort, "127.0.0.1");
				socket.httpReverse.on("error", socketErrHanler);
				socket.httpReverse.on("data", (data) =>
					socketDataHandler(data, socket),
				);
			}

			socket.on("error", (err) => {
				logger.log(`socket.on(${socket.remoteAddress}) error:`);
				logger.log(err.stack);
				try {
					socket.end();
				} catch (_) {}
				// socket.end();
			});

			socket.on("data", async (data) => {
				const parserResult = await parser(data);
				// if (global.config.server.secureMode && data.toString().includes("http/1.1")) {
				// logger.log("Encrypted WS!");
				// parserResult.result.isWebSocket = true;
				// }

				// const parserDecryptedResult = await parser(global.openSSH.decrypt(data));
				const peerAddress = `${socket.remoteAddress}:${socket.remotePort}`;
				//logger.log("Parser result is", parserResult);

				if (!socket.mainconnect) {
					// if (parserResult.result.isWebSocket || parserDecryptedResult.result.isWebSocket) {
					if (parserResult.result.isWebSocket) {
						socket.mainconnect = "ws";
						if (global.config.server.useFrontend) socket.httpReverse.end();
						if (global.config.server.useWebSocketAPI) {
							return socket.wsReverse.write(data, socketErrHanler);
						}
						return;
					} else if (parserResult.result.isHTTP) {
						socket.mainconnect = "http";
						socket.wsReverse.end();
						if (global.config.server.useFrontend) {
							return socket.httpReverse.write(data, socketErrHanler);
						}
						return;
					} else {
						if (global.config.server.useFrontend) socket.httpReverse.end();
						if (global.config.server.useWebSocketAPI) socket.wsReverse.end();
						socket.mainconnect = "tcp";
						return await this.api.exec(socket, data, () => {});
					}
				} else {
					switch (socket.mainconnect) {
						case "ws":
							if (global.config.server.useWebSocketAPI) {
								if (!socket.wsReverse.destroyed) {
									return socket.wsReverse.write(data, socketErrHanler);
								} else {
									socket.wsReverse = net.createConnection(wsPort, "127.0.0.1");
									socket.wsReverse.on("error", socketErrHanler);
									socket.wsReverse.on("data", (data) =>
										socketDataHandler(data, socket),
									);
									return socket.wsReverse.write(data, socketErrHanler);
								}
							}
						case "http":
							if (global.config.server.useFrontend) {
								if (!socket.httpReverse.destroyed) {
									return socket.httpReverse.write(data, socketErrHanler);
								} else {
									socket.httpReverse = net.createConnection(
										httpPort,
										"127.0.0.1",
									);
									socket.httpReverse.on("error", socketErrHanler);
									socket.httpReverse.on("data", (data) =>
										socketDataHandler(data, socket),
									);
									return socket.httpReverse.write(data, socketErrHanler);
								}
							}
						case "tcp":
							return await this.api.exec(socket, data, () => {});
						default:
							return;
					}
				}
			});
		});

		this.server.on("error", (err) => {
			logger.log("Error of server");
			logger.log(err.stack);
		});

		this.server.listen(this.port, this.address, (err) => {
			if (err) throw err;
			logger.log(
				`TCP server for ai-adventure labs connected on ${this.address}:${this.port}`,
			);
		});
	}
}
const defaultConfigData = {
	server: {
		address: "0.0.0.0",
		port: 8841,
		useWebSocketAPI: true,
		useFrontend: true,
		staticInfo: {
			wsPort: 57891,
			httpPort: 49901,
		},
	},
	database: {
		dialect: "sqlite",
		path: "./data",
	},
	ai: {
		apiType: "kobold",
	},
	rootuser: {
		login: "admin",
		password: "admin",
		activated: true,
	},
};

global.server = new Server();
cfgHandle(global.server, defaultConfigData, logger);

logger.log("Current config:", global.config);

global.server.run(global.config.server.address, global.config.server.port);

/*
if (global.config.server.secureMode) {
	async function initEncryption () {
		const datadir = global.config.server["ssl-path"] ?? path.join(__dirname, "/encryption");
		
		function generate () {
			logger.log("Generate new keys...");
			global.openSSH = crypt.generateOpenSSH({
				commonName: global.config.server.info.name
			}, {
				days: 365,
				pkcs7: true,
				clientCertificate: true,
				clientCertificateCN: "AI Adventure Labs",
				algorithm: 'sha256',
				keySize: 2048,
			});
			fs.writeFileSync(path.join(datadir, "public.pem"), global.openSSH.public_key.bytes);
			fs.writeFileSync(path.join(datadir, "private.pem"), global.openSSH.private_key.bytes);
			fs.writeFileSync(path.join(datadir, "cert.crt"), global.openSSH.cert);
		}
		
		const readFilePromise = new Promise((resolve, reject) => {
			fs.readFile(path.join(datadir, "public.pem"), (err, public_key) => {
				if (err) {
					return resolve(generate());
				}
				try {
					public_key = new crypt.CryptKey(public_key);
					const private_key = new crypt.CryptKey(fs.readFileSync(path.join(datadir, "private.pem")));
					const cert = fs.readFileSync(path.join(datadir, "cert.crt"));
					
					global.openSSH = new crypt.OpenSSH({
						public_key, private_key, cert
					});
					resolve();
				} catch (_) {
					resolve(generate());
				}
			});
		});
		
		await readFilePromise;
		
		logger.log(`loaded from ${datadir}`);
	};
	initEncryption().then(() => {
		server.run(global.config.server.address, global.config.server.port);
	}).catch(e => {
		throw e;
	});
}
else
	server.run(global.config.server.address, global.config.server.port);
*/