/*
 * Управляет пользовательским интерфейсом чата, включая ввод сообщений,
 * отображение истории и подсказки команд для взаимодействия с пользователем.
 */

import { ChatHistoryItem } from './models/ChatHistoryItem';

export class ChatPanel {
	container: HTMLElement;
	props: {
		chatHistory: ChatHistoryItem[];
		onSendMessage: (message: string) => void;
	};
	chatHistory: ChatHistoryItem[];
	messageInput: HTMLInputElement;
	sendButton: HTMLButtonElement;
	suggestionsContainer: HTMLDivElement;

	constructor(
		container: HTMLElement,
		props: {
			chatHistory: ChatHistoryItem[];
			onSendMessage: (message: string) => void;
		}
	) {
		this.container = container;
		this.props = props;
		this.chatHistory = props.chatHistory || [];

		this.init();
	}

	init(): void {
		this.container.innerHTML = `
            <div class="llm-agent-chat-panel">
                <div class="chat-history" id="chat-history"></div>
                <div class="chat-input-form">
                    <div class="command-input">
                        <input type="text" id="message-input" placeholder="Введите сообщение или команду (/)..." />
                        <div class="suggestions" id="suggestions" style="display: none;"></div>
                    </div>
                    <button type="button" id="send-button">Отправить</button>
                </div>
            </div>
        `;

		this.messageInput = this.container.querySelector('#message-input') as HTMLInputElement;
		this.sendButton = this.container.querySelector('#send-button') as HTMLButtonElement;
		this.suggestionsContainer = this.container.querySelector('#suggestions') as HTMLDivElement;

		this.setupEventListeners();
		this.renderHistory();
	}

	setupEventListeners(): void {
		this.sendButton.addEventListener('click', () => this.handleSend());

		this.messageInput.addEventListener('keydown', (e) => {
			if (e.key === 'Enter') {
				if (this.suggestionsContainer.style.display === 'block') {
					const firstSuggestion = this.suggestionsContainer.querySelector('.suggestion-item');
					if (firstSuggestion) {
						this.messageInput.value = firstSuggestion.textContent || '';
						this.hideSuggestions();
						e.preventDefault();
						return;
					}
				}
				this.handleSend();
				e.preventDefault();
			}
		});

		this.messageInput.addEventListener('input', (e) => {
			this.handleInput((e.target as HTMLInputElement).value);
		});
	}

	handleInput(value: string): void {
		const commands = ['/help', '/imagine', '/analyze', '/subtitles_meet', '/subtitles_teams', '/summarize', '/chat'];

		if (value.startsWith('/')) {
			const filteredCommands = commands.filter((cmd) => cmd.startsWith(value.toLowerCase()));
			this.showSuggestions(filteredCommands);
		} else {
			this.hideSuggestions();
		}
	}

	showSuggestions(suggestions: string[]): void {
		if (suggestions.length === 0) {
			this.hideSuggestions();
			return;
		}

		this.suggestionsContainer.innerHTML = suggestions.map((suggestion) => `<div class="suggestion-item">${suggestion}</div>`).join('');

		this.suggestionsContainer.style.display = 'block';

		// Добавляем обработчики кликов на предложения
		this.suggestionsContainer.querySelectorAll('.suggestion-item').forEach((item) => {
			item.addEventListener('click', () => {
				this.messageInput.value = item.textContent || '';
				this.hideSuggestions();
				this.messageInput.focus();
			});
		});
	}

	hideSuggestions(): void {
		this.suggestionsContainer.style.display = 'none';
	}

	handleSend(): void {
		const message = this.messageInput.value.trim();
		if (message && this.props.onSendMessage) {
			this.props.onSendMessage(message);
			this.messageInput.value = '';
			this.hideSuggestions();
		}
	}

	renderHistory(): void {
		const historyContainer = this.container.querySelector('#chat-history') as HTMLElement;
		historyContainer.innerHTML = this.chatHistory
			.map(
				(msg) => `
                <div class="message ${msg.role} message-type-${msg.type || 'default'}">
                    <div class="message-content">${this.processMessageContent(msg.content)}</div>
                </div>
            `
			)
			.join('');

		// Прокручиваем к концу
		historyContainer.scrollTop = historyContainer.scrollHeight;
	}

	processMessageContent(content: string): string {
		// Простейшая обработка Markdown для изображений
		return content.replace(/<img([^>]*?)>/g, '<img$1 style="max-width: 100%; height: auto;">').replace(/\n/g, '<br>');
	}

	updateHistory(newHistory: ChatHistoryItem[]): void {
		this.chatHistory = newHistory;
		this.renderHistory();
	}

	destroy(): void {
		this.container.innerHTML = '';
	}
}