import pino from 'pino';
import { IProtocol, IProtocolHandlers, ListEntry, ProtocolAddUser, ProtocolChatHistory, ScreenRect } from './Protocol';
import { User } from './User';

import * as cvm from '@cvmts/cvm-rs';

// CollabVM protocol implementation for Guacamole.
export class GuacamoleProtocol implements IProtocol {
	private handlers: IProtocolHandlers | null = null;
	private logger = pino({
		name: 'CVMTS.GuacamoleProtocol'
	});

	private user: User | null = null;

	init(u: User): void {
		this.user = u;
	}

	setHandler(handlers: IProtocolHandlers): void {
		this.handlers = handlers;
	}

	private __processMessage_admin(decodedElements: string[]): boolean {
		switch (decodedElements[1]) {
			case '2':
				// Login
				if (decodedElements.length !== 3) return false;
				this.handlers?.onAdminLogin(this.user!, decodedElements[2]);
				break;
			case '5':
				// QEMU Monitor
				if (decodedElements.length !== 4) return false;
				// [2] node
				// [3] cmd
				break;
			case '8':
				// Restore
				break;
			case '10':
				// Reboot
				if (decodedElements.length !== 3) return false;
				// [2] - node
				break;
			case '12':
			// Ban

			case '13':
				// Force Vote
				if (decodedElements.length !== 3) return false;

				break;
			case '14':
				// Mute
				if (decodedElements.length !== 4) return false;
				break;
			case '15':
			// Kick
			case '16':
				// End turn
				if (decodedElements.length !== 3) return false;
				break;
			case '17':
				// Clear turn queue
				if (decodedElements.length !== 3) return false;
				// [2] - node
				break;
			case '18':
				// Rename user
				if (decodedElements.length !== 4) return false;

				// [2] - username
				// [3] - new username
				break;
			case '19':
				// Get IP
				if (decodedElements.length !== 3) return false;
				break;
			case '20':
				// Steal turn
				break;
			case '21':
				// XSS
				if (decodedElements.length !== 3) return false;
				// [2] message
				break;
			case '22':
				// Toggle turns
				if (decodedElements.length !== 3) return false;
				// [2] 0 == disable 1 == enable
				break;
			case '23':
				// Indefinite turn
				break;
			case '24':
				// Hide screen

				if (decodedElements.length !== 3) return false;
				// 0 - hide
				// 1 - unhide

				break;
			case '25':
				if (decodedElements.length !== 3) return false;
				// [2]
				break;
		}
		return true;
	}

	processMessage(buffer: Buffer): boolean {
		let decodedElements = cvm.guacDecode(buffer.toString('utf-8'));
		if (decodedElements.length < 1) return false;

		// The first element is the "opcode".
		switch (decodedElements[0]) {
			case 'nop':
				this.handlers?.onNop(this.user!);
				break;
			case 'cap':
				if (decodedElements.length < 2) return false;
				this.handlers?.onCapabilityUpgrade(this.user!, decodedElements.slice(1));
				break;
			case 'login':
				if (decodedElements.length !== 2) return false;
				this.handlers?.onLogin(this.user!, decodedElements[1]);
				break;
			case 'noflag':
				this.handlers?.onNoFlag(this.user!);
				break;
			case 'list':
				this.handlers?.onList(this.user!);
				break;
			case 'connect':
				if (decodedElements.length !== 2) return false;
				this.handlers?.onConnect(this.user!, decodedElements[1]);
				break;
			case 'view':
				{
					if (decodedElements.length !== 3) return false;
					let viewMode = parseInt(decodedElements[2]);
					if (viewMode == undefined) return false;

					this.handlers?.onView(this.user!, decodedElements[1], viewMode);
				}
				break;
			case 'rename':
				this.handlers?.onRename(this.user!, decodedElements[1]);
				break;
			case 'chat':
				if (decodedElements.length !== 2) return false;
				this.handlers?.onChat(this.user!, decodedElements[1]);
				break;
			case 'turn':
				let forfeit = false;
				if (decodedElements.length > 2) return false;
				if (decodedElements.length == 1) {
					 forfeit = false;
				} else {
					if (decodedElements[1] == '0') forfeit = true;
					else if (decodedElements[1] == '1') forfeit = false;
				}

				this.handlers?.onTurnRequest(this.user!, forfeit);
				break;
			case 'mouse':
				if (decodedElements.length !== 4) return false;

				let x = parseInt(decodedElements[1]);
				let y = parseInt(decodedElements[2]);
				let mask = parseInt(decodedElements[3]);
				if (x === undefined || y === undefined || mask === undefined) return false;

				this.handlers?.onMouse(this.user!, x, y, mask);
				break;
			case 'key':
				if (decodedElements.length !== 3) return false;
				var keysym = parseInt(decodedElements[1]);
				var down = parseInt(decodedElements[2]);
				if (keysym === undefined || (down !== 0 && down !== 1)) return false;
				this.handlers?.onKey(this.user!, keysym, down === 1);
				break;
			case 'vote':
				if (decodedElements.length !== 2) return false;
				let choice = parseInt(decodedElements[1]);
				if (choice == undefined) return false;
				this.handlers?.onVote(this.user!, choice);
				break;

			case 'admin':
				if (decodedElements.length < 2) return false;
				return this.__processMessage_admin(decodedElements);
		}

		return true;
	}

	// Senders

	sendAuth(authServer: string): void {
		this.user?.sendMsg(cvm.guacEncode('auth', authServer));
	}

	sendNop(): void {
		this.user?.sendMsg(cvm.guacEncode('nop'));
	}

	sendSync(now: number): void {
		this.user?.sendMsg(cvm.guacEncode('sync', now.toString()));
	}

	sendConnectFailResponse(): void {
		this.user?.sendMsg(cvm.guacEncode('connect', '0'));
	}

	sendConnectOKResponse(votes: boolean): void {
		this.user?.sendMsg(cvm.guacEncode('connect', '1', '1', votes ? '1' : '0', '0'));
	}

	sendLoginResponse(ok: boolean, message: string | undefined): void {
		if (ok) {
			this.user?.sendMsg(cvm.guacEncode('login', '1'));
			return;
		} else {
			this.user?.sendMsg(cvm.guacEncode('login', '0', message!));
		}
	}

	sendChatMessage(username: string, message: string): void {
		this.user?.sendMsg(cvm.guacEncode('chat', username, message));
	}

	sendChatHistoryMessage(history: ProtocolChatHistory[]): void {
		let arr = ['chat'];
		for (let a of history) {
			arr.push(a.user);
			arr.push(a.msg);
		}

		this.user?.sendMsg(cvm.guacEncode(...arr));
	}

	sendAddUser(users: ProtocolAddUser[]): void {
		let arr = ['adduser', users.length.toString()];
		for (let user of users) {
			arr.push(user.username);
			arr.push(user.rank.toString());
		}

		this.user?.sendMsg(cvm.guacEncode(...arr));
	}

	sendRemUser(users: string[]): void {
		let arr = ['remuser', users.length.toString()];

		for (let user of users) {
			arr.push(user);
		}

		this.user?.sendMsg(cvm.guacEncode(...arr));
	}

	sendListResponse(list: ListEntry[]): void {
		let arr = ['list'];
		for (let node of list) {
			arr.push(node.id);
			arr.push(node.name);
			arr.push(node.thumbnail.toString('base64'));
		}

		this.user?.sendMsg(cvm.guacEncode(...arr));
	}

	sendScreenResize(width: number, height: number): void {
		this.user?.sendMsg(cvm.guacEncode('size', '0', width.toString(), height.toString()));
	}

	sendScreenUpdate(rect: ScreenRect): void {
		this.user?.sendMsg(cvm.guacEncode('png', '0', '0', rect.x.toString(), rect.y.toString(), rect.data.toString('base64')));
		this.sendSync(Date.now());
	}
}