class Message {
	constructor(model) {
		this.author = model.author;
		this.body = model.body;
		this.image = model.image || generateAvatar(model.author);
		this.id = model.id;
		this.type = model.type;
	}

	formatText() {
		var markdownToHTML = new showdown.Converter({
			emoji: true, 
			openLinksInNewWindow: true, 
			tables: false, 
			strikethrough: false, 
			simplifiedAutoLink: false,
		}).makeHtml(this.body);
		var linked = autoLink(markdownToHTML, { embed: true });
		return addNewlines(linked);
	}
	userColor() {
		return messageBubbleColorForString(this.author);
	}
}



class MessagingInterface {
	constructor() {
		this.websocket = null;
		this.chatDisplayed = false;
		this.username = '';
		this.messageCharCount = 0;
		this.maxMessageLength = 500;
		this.maxMessageBuffer = 20;

		this.onReceivedMessages = this.onReceivedMessages.bind(this);
		this.disableChat = this.disableChat.bind(this);
		this.enableChat = this.enableChat.bind(this);
	}

	init() {
		this.tagAppContainer = document.getElementById('app-container');
		this.tagChatToggle = document.getElementById('chat-toggle');
		this.tagUserInfoChanger = document.getElementById('user-info-change');
		this.tagUsernameDisplay = document.getElementById('username-display');
		this.tagMessageFormWarning = document.getElementById('message-form-warning');

		this.inputMessageAuthor = document.getElementById('self-message-author');
		this.inputChangeUserName = document.getElementById('username-change-input'); 

		this.btnUpdateUserName = document.getElementById('button-update-username'); 
		this.btnCancelUpdateUsername = document.getElementById('button-cancel-change'); 
		this.btnSubmitMessage = document.getElementById('button-submit-message');

		this.formMessageInput = document.getElementById('message-body-form');

		this.imgUsernameAvatar = document.getElementById('username-avatar');
		this.textUserInfoDisplay = document.getElementById('user-info-display');

		this.scrollableMessagesContainer = document.getElementById('messages-container');

		// add events
		this.tagChatToggle.addEventListener('click', this.handleChatToggle.bind(this));
		this.textUserInfoDisplay.addEventListener('click', this.handleShowChangeNameForm.bind(this));
		
		this.btnUpdateUserName.addEventListener('click', this.handleUpdateUsername.bind(this));
		this.btnCancelUpdateUsername.addEventListener('click', this.handleHideChangeNameForm.bind(this));
		
		this.inputChangeUserName.addEventListener('keydown', this.handleUsernameKeydown.bind(this));
		this.formMessageInput.addEventListener('keydown', this.handleMessageInputKeydown.bind(this));
		this.btnSubmitMessage.addEventListener('click', this.handleSubmitChatButton.bind(this));

		this.initLocalStates();

		if (hasTouchScreen()) {
			setVHvar();
			window.addEventListener("orientationchange", setVHvar);
			this.tagAppContainer.classList.add('touch-screen');
		}

	}

	setWebsocket(socket) {
		this.websocket = socket;
	}

	initLocalStates() {
		this.username = getLocalStorage(KEY_USERNAME) || generateUsername();
		this.imgUsernameAvatar.src =
			getLocalStorage(KEY_AVATAR) || generateAvatar(`${this.username}${Date.now()}`);
		this.updateUsernameFields(this.username);

		this.chatDisplayed = getLocalStorage(KEY_CHAT_DISPLAYED) || true;
		this.displayChat();
	}

	updateUsernameFields(username) {
		this.tagUsernameDisplay.innerText = username;
		this.inputChangeUserName.value = username;
		this.inputMessageAuthor.value = username;
	}

	displayChat() {
		if (this.chatDisplayed) {
			this.tagAppContainer.classList.add('chat');
			this.tagAppContainer.classList.remove('no-chat');
			jumpToBottom(this.scrollableMessagesContainer);
		} else {
			this.tagAppContainer.classList.add('no-chat');
			this.tagAppContainer.classList.remove('chat');
		}
		this.setChatPlaceholderText();
	}

	
	handleChatToggle() {
		this.chatDisplayed = !this.chatDisplayed;
		if (this.chatDisplayed) {
			setLocalStorage(KEY_CHAT_DISPLAYED, this.chatDisplayed);
		} else {
			clearLocalStorage(KEY_CHAT_DISPLAYED);
		}
		this.displayChat();
	}

	handleShowChangeNameForm() {
		this.textUserInfoDisplay.style.display = 'none';
		this.tagUserInfoChanger.style.display = 'flex';
		if (document.body.clientWidth < 640) {
			this.tagChatToggle.style.display = 'none';
		}
	}

	handleHideChangeNameForm() {
		this.textUserInfoDisplay.style.display = 'flex';
		this.tagUserInfoChanger.style.display = 'none';
		if (document.body.clientWidth < 640) {
			this.tagChatToggle.style.display = 'inline-block';
		}
	}

	handleUpdateUsername() {
		var newValue = this.inputChangeUserName.value;
		newValue = newValue.trim();
		// do other string cleanup?

		if (newValue) {
			this.username = newValue;
			this.updateUsernameFields(newValue);
			this.imgUsernameAvatar.src = generateAvatar(`${newValue}${Date.now()}`);
			setLocalStorage(KEY_USERNAME, newValue);
			setLocalStorage(KEY_AVATAR, this.imgUsernameAvatar.src);
		}
		this.handleHideChangeNameForm();
	}

	handleUsernameKeydown(event) {
		if (event.keyCode === 13) { // enter
			this.handleUpdateUsername();
		} else if (event.keyCode === 27) { // esc
			this.handleHideChangeNameForm();
		}
	}

	handleMessageInputKeydown(event) {
		var okCodes = [37,38,39,40,16,91,18,46,8];
		var value = this.formMessageInput.value.trim();
		var numCharsLeft = this.maxMessageLength - value.length;
		if (event.keyCode === 13) { // enter
			if (!this.prepNewLine) {
				this.submitChat(value);
				event.preventDefault();
				
				return;
			}
			this.prepNewLine = false;
		} else {
			this.prepNewLine = false;
		}
		if (event.keyCode === 16 || event.keyCode === 17) { // ctrl, shift
			this.prepNewLine = true;
		}

		if (numCharsLeft <= this.maxMessageBuffer) {
			this.tagMessageFormWarning.innerText = `${numCharsLeft} chars left`;
			if (numCharsLeft <= 0 && !okCodes.includes(event.keyCode)) {
				event.preventDefault();
				return;
			}
		} else {
			this.tagMessageFormWarning.innerText = '';
		}
	}

	handleSubmitChatButton(event) {
		var value = this.formMessageInput.value.trim();
		if (value) {
			this.submitChat(value);
			event.preventDefault();
		return false;
		}
		event.preventDefault();
		return false;
	}

	submitChat(content) {
		if (!content) {
			return;
		}
		var message = new Message({
			body: content,
			author: this.username,
			image: this.imgUsernameAvatar.src,
		});
		const messageJSON = JSON.stringify(message);
		if (this.websocket) {
			try {
				this.websocket.send(messageJSON);
			} catch(e) {
				console.log('Message send error:', e);
				return;
			}
		}

		// clear out things.
		this.formMessageInput.value = '';
		this.tagMessageFormWarning.innerText = '';

		const hasSentFirstChatMessage = getLocalStorage(KEY_CHAT_FIRST_MESSAGE_SENT);
		if (!hasSentFirstChatMessage) {
			setLocalStorage(KEY_CHAT_FIRST_MESSAGE_SENT, true);
			this.setChatPlaceholderText();
		}
	}

	disableChat() {
		if (this.formMessageInput) {
			this.formMessageInput.disabled = true;
			this.formMessageInput.placeholder = CHAT_PLACEHOLDER_OFFLINE;
		}
	}
	enableChat() {
		if (this.formMessageInput) {
			this.formMessageInput.disabled = false;
			this.setChatPlaceholderText();
		}
	}

	setChatPlaceholderText() {
		const hasSentFirstChatMessage = getLocalStorage(KEY_CHAT_FIRST_MESSAGE_SENT);
		this.formMessageInput.placeholder = hasSentFirstChatMessage ? CHAT_PLACEHOLDER_TEXT : CHAT_INITIAL_PLACEHOLDER_TEXT
	}

	// handle Vue.js message display
	onReceivedMessages(newMessages, oldMessages) {
		if (newMessages.length !== oldMessages.length) {
			// jump to bottom
			jumpToBottom(this.scrollableMessagesContainer);
		}
	}
}