/**
 * ds-chat-panel.js
 * AI chatbot panel with team+project context
 * MVP1: Integrates claude-service with ContextStore for team-aware assistance
 */

import claudeService from '../../services/claude-service.js';
import contextStore from '../../stores/context-store.js';
import { ComponentHelpers } from '../../utils/component-helpers.js';

class DSChatPanel extends HTMLElement {
  constructor() {
    super();
    this.messages = [];
    this.isLoading = false;
  }

  async connectedCallback() {
    // Sync claude-service with ContextStore
    const context = contextStore.getMCPContext();
    if (context.project_id) {
      claudeService.setProject(context.project_id);
    }

    // Subscribe to project changes
    this.unsubscribe = contextStore.subscribeToKey('projectId', (newProjectId) => {
      if (newProjectId) {
        claudeService.setProject(newProjectId);
        this.showSystemMessage(`Switched to project: ${newProjectId}`);
      }
    });

    // Initialize MCP tools in background
    this.initializeMcpTools();

    this.render();
    this.setupEventListeners();
    this.loadHistory();
    this.showWelcomeMessage();
  }

  /**
   * Initialize MCP tools to enable AI tool awareness
   */
  async initializeMcpTools() {
    try {
      console.log('[DSChatPanel] Initializing MCP tools...');
      await claudeService.getMcpTools();
      console.log('[DSChatPanel] MCP tools initialized successfully');
    } catch (error) {
      console.warn('[DSChatPanel] Failed to load MCP tools (non-blocking):', error.message);
    }
  }

  /**
   * Set context from parent component (ds-ai-chat-sidebar)
   * @param {Object} context - Context object with project, team, page
   */
  setContext(context) {
    if (!context) return;

    // Handle project context (could be object with id or string id)
    if (context.project) {
      const projectId = typeof context.project === 'object'
        ? context.project.id
        : context.project;

      if (projectId && projectId !== claudeService.currentProjectId) {
        claudeService.setProject(projectId);
        console.log('[DSChatPanel] Context updated via setContext:', { projectId });
      }
    }

    // Store team and page context for reference
    if (context.team) {
      this.currentTeam = context.team;
    }
    if (context.page) {
      this.currentPage = context.page;
    }
  }

  disconnectedCallback() {
    if (this.unsubscribe) {
      this.unsubscribe();
    }
  }

  setupEventListeners() {
    const input = this.querySelector('#chat-input');
    const sendBtn = this.querySelector('#chat-send-btn');
    const clearBtn = this.querySelector('#chat-clear-btn');
    const exportBtn = this.querySelector('#chat-export-btn');

    if (sendBtn && input) {
      sendBtn.addEventListener('click', () => this.sendMessage());
      input.addEventListener('keypress', (e) => {
        if (e.key === 'Enter' && !e.shiftKey) {
          e.preventDefault();
          this.sendMessage();
        }
      });
    }

    if (clearBtn) {
      clearBtn.addEventListener('click', () => this.clearChat());
    }

    if (exportBtn) {
      exportBtn.addEventListener('click', () => this.exportChat());
    }
  }

  loadHistory() {
    const history = claudeService.getHistory();
    if (history && history.length > 0) {
      this.messages = history;
      this.renderMessages();
    }
  }

  showWelcomeMessage() {
    if (this.messages.length === 0) {
      const context = contextStore.getMCPContext();
      const teamId = context.team_id || 'ui';

      const teamGreetings = {
        ui: 'I can help with token extraction, component audits, Storybook comparisons, and quick wins analysis.',
        ux: 'I can assist with Figma syncing, design tokens, asset management, and navigation flows.',
        qa: 'I can help with visual regression testing, accessibility audits, and ESRE validation.',
        admin: 'I can help manage projects, configure integrations, and oversee the design system.'
      };

      const greeting = teamGreetings[teamId] || teamGreetings.admin;

      this.showSystemMessage(
        `👋 Welcome to the ${teamId.toUpperCase()} team workspace!\n\n${greeting}\n\nI have access to all MCP tools for the active project.`
      );
    }
  }

  showSystemMessage(text) {
    this.messages.push({
      role: 'system',
      content: text,
      timestamp: new Date().toISOString()
    });
    this.renderMessages();
  }

  async sendMessage() {
    const input = this.querySelector('#chat-input');
    const message = input?.value.trim();

    if (!message || this.isLoading) return;

    // Check project context
    const context = contextStore.getMCPContext();
    if (!context.project_id) {
      ComponentHelpers.showToast?.('Please select a project before chatting', 'error');
      return;
    }

    // Add user message
    this.messages.push({
      role: 'user',
      content: message,
      timestamp: new Date().toISOString()
    });

    // Clear input
    input.value = '';

    // Render and scroll
    this.renderMessages();
    this.scrollToBottom();

    // Show loading
    this.isLoading = true;
    this.updateLoadingState();

    try {
      // Add team context to the request
      const teamContext = {
        projectId: context.project_id,
        teamId: context.team_id,
        userId: context.user_id,
        page: 'workdesk',
        capabilities: context.capabilities
      };

      // Send to Claude with team+project context
      const response = await claudeService.chat(message, teamContext);

      // Add assistant response
      this.messages.push({
        role: 'assistant',
        content: response,
        timestamp: new Date().toISOString()
      });

      this.renderMessages();
      this.scrollToBottom();
    } catch (error) {
      console.error('[DSChatPanel] Failed to send message:', error);
      ComponentHelpers.showToast?.(`Chat error: ${error.message}`, 'error');

      this.messages.push({
        role: 'system',
        content: `❌ Error: ${error.message}\n\nPlease try again or check your connection.`,
        timestamp: new Date().toISOString()
      });

      this.renderMessages();
    } finally {
      this.isLoading = false;
      this.updateLoadingState();
    }
  }

  clearChat() {
    if (!confirm('Clear all chat history?')) return;

    claudeService.clearHistory();
    this.messages = [];
    this.renderMessages();
    this.showWelcomeMessage();
    ComponentHelpers.showToast?.('Chat history cleared', 'success');
  }

  exportChat() {
    claudeService.exportConversation();
    ComponentHelpers.showToast?.('Chat exported successfully', 'success');
  }

  updateLoadingState() {
    const sendBtn = this.querySelector('#chat-send-btn');
    const input = this.querySelector('#chat-input');

    if (sendBtn) {
      sendBtn.disabled = this.isLoading;
      sendBtn.textContent = this.isLoading ? '⏳ Sending...' : '📤 Send';
    }

    if (input) {
      input.disabled = this.isLoading;
    }
  }

  scrollToBottom() {
    const messagesContainer = this.querySelector('#chat-messages');
    if (messagesContainer) {
      setTimeout(() => {
        messagesContainer.scrollTop = messagesContainer.scrollHeight;
      }, 100);
    }
  }

  renderMessages() {
    const messagesContainer = this.querySelector('#chat-messages');
    if (!messagesContainer) return;

    if (this.messages.length === 0) {
      messagesContainer.innerHTML = `
        <div style="text-align: center; padding: 48px; color: var(--vscode-text-dim);">
          <div style="font-size: 48px; margin-bottom: 16px;">💬</div>
          <h3 style="font-size: 14px; font-weight: 600; margin-bottom: 8px;">No messages yet</h3>
          <p style="font-size: 12px;">Start a conversation to get help with your design system.</p>
        </div>
      `;
      return;
    }

    messagesContainer.innerHTML = this.messages.map(msg => {
      const isUser = msg.role === 'user';
      const isSystem = msg.role === 'system';

      const alignStyle = isUser ? 'flex-end' : 'flex-start';
      const bgColor = isUser
        ? 'var(--vscode-button-background)'
        : isSystem
          ? 'rgba(255, 191, 0, 0.1)'
          : 'var(--vscode-sidebar)';
      const textColor = isUser ? 'var(--vscode-button-foreground)' : 'var(--vscode-text)';
      const maxWidth = isSystem ? '100%' : '80%';
      const icon = isUser ? '👤' : isSystem ? 'ℹ️' : '🤖';

      return `
        <div style="display: flex; justify-content: ${alignStyle}; margin-bottom: 16px;">
          <div style="max-width: ${maxWidth}; background: ${bgColor}; padding: 12px; border-radius: 8px; color: ${textColor};">
            <div style="font-size: 10px; color: var(--vscode-text-dim); margin-bottom: 6px; display: flex; align-items: center; gap: 6px;">
              <span>${icon}</span>
              <span>${isUser ? 'You' : isSystem ? 'System' : 'AI Assistant'}</span>
              <span>•</span>
              <span>${ComponentHelpers.formatRelativeTime(new Date(msg.timestamp))}</span>
            </div>
            <div style="font-size: 12px; white-space: pre-wrap; word-wrap: break-word;">
              ${ComponentHelpers.escapeHtml(msg.content)}
            </div>
          </div>
        </div>
      `;
    }).join('');
  }

  render() {
    this.innerHTML = `
      <div style="height: 100%; display: flex; flex-direction: column; background: var(--vscode-bg);">
        <!-- Header -->
        <div style="padding: 12px 16px; border-bottom: 1px solid var(--vscode-border); display: flex; justify-content: space-between; align-items: center;">
          <div>
            <h3 style="font-size: 12px; font-weight: 600; margin-bottom: 4px;">AI Assistant</h3>
            <div style="font-size: 10px; color: var(--vscode-text-dim);">Team-contextualized help with MCP tools</div>
          </div>
          <div style="display: flex; gap: 8px;">
            <button id="chat-export-btn" class="button" style="padding: 4px 8px; font-size: 10px;">
              📥 Export
            </button>
            <button id="chat-clear-btn" class="button" style="padding: 4px 8px; font-size: 10px;">
              🗑️ Clear
            </button>
          </div>
        </div>

        <!-- Messages -->
        <div id="chat-messages" style="flex: 1; overflow-y: auto; padding: 16px;">
          ${ComponentHelpers.renderLoading('Loading chat...')}
        </div>

        <!-- Input -->
        <div style="padding: 16px; border-top: 1px solid var(--vscode-border);">
          <div style="display: flex; gap: 8px;">
            <textarea
              id="chat-input"
              placeholder="Ask me anything about your design system..."
              class="input"
              style="flex: 1; min-height: 60px; resize: vertical; font-size: 12px;"
              rows="2"
            ></textarea>
            <button id="chat-send-btn" class="button" style="padding: 8px 16px; font-size: 12px; height: 60px;">
              📤 Send
            </button>
          </div>
          <div style="font-size: 10px; color: var(--vscode-text-dim); margin-top: 8px;">
            Press Enter to send • Shift+Enter for new line
          </div>
        </div>
      </div>
    `;
  }
}

customElements.define('ds-chat-panel', DSChatPanel);

export default DSChatPanel;