/*
 * Управляет и отображает историю графов чата. Предоставляет функционал для выбора
 * прошлых разговоров, начала новых чатов и удаления записей графов.
 */

import { EventBus } from '../utils/EventBus';

export class HistoryPanel {
	container: HTMLElement;
	props: {
		graphs: any[];
		onGraphSelect: (data: { graphId: string; currentNode: string | null }) => void;
		eventBus: EventBus;
	};
	graphs: any[];
	newChatButton: HTMLButtonElement;
	chatList: HTMLElement;
	contextMenu: HTMLElement;
	deleteButton: HTMLButtonElement;
	contextMenuGraphId: string | null;

	constructor(
		container: HTMLElement,
		props: {
			graphs: any[];
			onGraphSelect: (data: { graphId: string; currentNode: string | null }) => void;
            eventBus: EventBus;
		}
	) {
		this.container = container;
		this.props = props;
		this.graphs = props.graphs || [];

		this.init();
	}

	init(): void {
		this.container.innerHTML = `
            <div class="llm-agent-history-panel">
                <div class="history-header">
                    <h3>История диалогов</h3>
                    <button id="new-chat-button" class="new-chat-button">+ Новый чат</button>
                </div>
                <div class="chat-list" id="chat-list"></div>
                <div class="context-menu" id="context-menu" style="display: none;">
                    <button id="delete-graph-button">Удалить</button>
                </div>
            </div>
        `;

		this.newChatButton = this.container.querySelector('#new-chat-button') as HTMLButtonElement;
		this.chatList = this.container.querySelector('#chat-list') as HTMLElement;
		this.contextMenu = this.container.querySelector('#context-menu') as HTMLElement;
		this.deleteButton = this.container.querySelector('#delete-graph-button') as HTMLButtonElement;

		this.setupEventListeners();
		this.renderGraphs();
	}

	setupEventListeners(): void {
		this.newChatButton.addEventListener('click', () => {
            this.props.eventBus.emit('new-chat');
		});

		this.deleteButton.addEventListener('click', () => {
			if (this.contextMenuGraphId) {
				this.handleDeleteGraph(this.contextMenuGraphId);
			}
		});

		// Закрытие контекстного меню при клике вне его
		document.addEventListener('click', (e) => {
			if (!this.contextMenu.contains(e.target as Node)) {
				this.contextMenu.style.display = 'none';
			}
		});
	}

	renderGraphs(): void {
		this.chatList.innerHTML = this.graphs
			.map(
				(graph) => `
                <div class="chat-list-item" data-graph-id="${graph.id}">
                    <div class="chat-item-content">
                        <div class="chat-item-text">
                            <span class="truncate">
                                ${graph.first_message || `Граф ${graph.id}`}
                            </span>
                        </div>
                        <div class="chat-item-actions">
                            <button class="chat-item-options-button" data-graph-id="${graph.id}">
                                ⋮
                            </button>
                        </div>
                    </div>
                </div>
            `
			)
			.join('');

		// Добавляем обработчики событий
		this.chatList.querySelectorAll('.chat-list-item').forEach((item) => {
			item.addEventListener('click', (e) => {
				if (!(e.target as HTMLElement).classList.contains('chat-item-options-button')) {
					const graphId = (item as HTMLElement).dataset.graphId;
					if (graphId && this.props.onGraphSelect) {
						this.props.onGraphSelect({ graphId: graphId, currentNode: null });
					}
				}
			});
		});

		this.chatList.querySelectorAll('.chat-item-options-button').forEach((button) => {
			button.addEventListener('click', (e) => {
				e.stopPropagation();
				this.showContextMenu(e, (button as HTMLElement).dataset.graphId || '');
			});
		});
	}

	showContextMenu(event: Event, graphId: string): void {
		this.contextMenuGraphId = graphId;
		this.contextMenu.style.display = 'block';
		this.contextMenu.style.left = `${(event as MouseEvent).clientX}px`;
		this.contextMenu.style.top = `${(event as MouseEvent).clientY}px`;
	}

	async handleDeleteGraph(graphId: string): Promise<void> {
		try {
			const response = await fetch(`http://localhost:5000/api/graphs/${graphId}`, {
				method: 'DELETE'
			});

			if (!response.ok) {
				throw new Error(`HTTP ошибка! статус: ${response.status}`);
			}

			// Обновляем список графов
			this.graphs = this.graphs.filter((graph) => graph.id !== graphId);
			this.renderGraphs();
			this.contextMenu.style.display = 'none';
		} catch (error) {
			console.error('Ошибка удаления графа:', error);
		}
	}

	updateGraphs(newGraphs: any[]): void {
		this.graphs = newGraphs;
		this.renderGraphs();
	}

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