/**
 * Payfrit HUD - Heads Up Display for Task Management
 *
 * Displays tasks as vertical bars that grow over 60 seconds.
 * Bars flash when they exceed the target time.
 * Workers can tap to view details or long-press to accept.
 */

const HUD = {
  // Configuration
  config: {
    pollInterval: 1000,        // Poll every second for smooth animation
    targetSeconds: 60,         // Target time to accept a task
    apiBaseUrl: '/api/tasks',  // API endpoint
    businessId: parseInt(new URLSearchParams(window.location.search).get('b')) || 17,
  },

  // State
  tasks: [],
  selectedTask: null,
  longPressTimer: null,
  isConnected: true,
  businessName: '',

  // Category names (will be loaded from API)
  categories: {
    1: { name: 'Orders', color: '#ef4444' },
    2: { name: 'Pickup', color: '#f59e0b' },
    3: { name: 'Delivery', color: '#22c55e' },
    4: { name: 'Support', color: '#3b82f6' },
    5: { name: 'Kitchen', color: '#8b5cf6' },
    6: { name: 'Other', color: '#ec4899' },
  },

  // Initialize
  init() {
    this.updateClock();
    setInterval(() => this.updateClock(), 1000);
    setInterval(() => this.updateBars(), 1000);
    setInterval(() => this.fetchTasks(), 3000);

    // Initial fetch (also gets business name)
    this.fetchTasks();

    // Close overlay on background tap
    document.getElementById('taskOverlay').addEventListener('click', (e) => {
      if (e.target.id === 'taskOverlay') {
        this.closeOverlay();
      }
    });

    console.log('[HUD] Initialized');
  },

  // Update the clock display
  updateClock() {
    const now = new Date();
    const hours = String(now.getHours()).padStart(2, '0');
    const minutes = String(now.getMinutes()).padStart(2, '0');
    const seconds = String(now.getSeconds()).padStart(2, '0');
    document.getElementById('clock').textContent = `${hours}:${minutes}:${seconds}`;
  },

  // Fetch tasks from API
  async fetchTasks() {
    try {
      const response = await fetch(`${this.config.apiBaseUrl}/listPending.cfm`, {
        method: 'POST',
        headers: { 'Content-Type': 'application/json' },
        body: JSON.stringify({ BusinessID: this.config.businessId })
      });

      const data = await response.json();

      if (data.OK) {
        this.tasks = data.TASKS || [];
        this.renderTasks();
        this.setConnected(true);

        // Update business name from response
        if (data.BUSINESS_NAME && !this.businessName) {
          this.businessName = data.BUSINESS_NAME;
          document.getElementById('businessName').textContent = ' - ' + this.businessName;
        }
      } else {
        console.error('[HUD] API error:', data.ERROR);
        this.setConnected(false);
      }
    } catch (err) {
      console.error('[HUD] Fetch error:', err);
      this.setConnected(false);

      // Demo mode: generate fake tasks if API unavailable
      if (this.tasks.length === 0) {
        this.loadDemoTasks();
      }
    }
  },

  // Load demo tasks for testing
  loadDemoTasks() {
    const now = Date.now();
    this.tasks = [
      { TaskID: 101, TaskCategoryID: 1, TaskTitle: 'Order #42', TaskCreatedOn: new Date(now - 15000).toISOString() },
      { TaskID: 102, TaskCategoryID: 3, TaskTitle: 'Order #43', TaskCreatedOn: new Date(now - 35000).toISOString() },
      { TaskID: 103, TaskCategoryID: 2, TaskTitle: 'Pickup #7', TaskCreatedOn: new Date(now - 55000).toISOString() },
      { TaskID: 104, TaskCategoryID: 5, TaskTitle: 'Prep #12', TaskCreatedOn: new Date(now - 70000).toISOString() },
    ];
    this.renderTasks();
  },

  // Render task bars
  renderTasks() {
    const container = document.getElementById('taskContainer');
    const emptyState = document.getElementById('emptyState');

    // Show/hide empty state
    if (this.tasks.length === 0) {
      emptyState.style.display = 'block';
    } else {
      emptyState.style.display = 'none';
    }

    // Get existing bar elements
    const existingBars = container.querySelectorAll('.task-bar');
    const existingIds = new Set();
    existingBars.forEach(bar => existingIds.add(parseInt(bar.dataset.taskId)));

    // Get current task IDs
    const currentIds = new Set(this.tasks.map(t => t.TaskID));

    // Remove bars for tasks that no longer exist
    existingBars.forEach(bar => {
      const id = parseInt(bar.dataset.taskId);
      if (!currentIds.has(id)) {
        bar.remove();
      }
    });

    // Add or update bars
    this.tasks.forEach(task => {
      let bar = container.querySelector(`.task-bar[data-task-id="${task.TaskID}"]`);

      if (!bar) {
        bar = this.createTaskBar(task);
        container.appendChild(bar);
      }

      this.updateTaskBar(bar, task);
    });
  },

  // Create a new task bar element
  createTaskBar(task) {
    const bar = document.createElement('div');
    bar.className = 'task-bar';
    bar.dataset.taskId = task.TaskID;
    bar.dataset.category = task.TaskCategoryID || 1;

    // Apply dynamic category color
    const categoryColor = this.getCategoryColor(task);
    bar.style.setProperty('--bar-color', categoryColor);

    bar.innerHTML = `
      <span class="task-time"></span>
      <span class="task-id">#${task.TaskID}</span>
      <span class="task-label">${this.getCategoryName(task)}</span>
    `;

    // Touch/click handlers
    bar.addEventListener('mousedown', (e) => this.onBarPress(task, e));
    bar.addEventListener('mouseup', () => this.onBarRelease());
    bar.addEventListener('mouseleave', () => this.onBarRelease());
    bar.addEventListener('touchstart', (e) => this.onBarPress(task, e));
    bar.addEventListener('touchend', () => this.onBarRelease());
    bar.addEventListener('click', () => this.onBarTap(task));

    return bar;
  },

  // Update task bar height and state
  updateTaskBar(bar, task) {
    const elapsed = this.getElapsedSeconds(task.TaskCreatedOn);
    const percentage = Math.min(elapsed / this.config.targetSeconds * 100, 100);

    bar.style.height = `${percentage}%`;

    // Update time display
    const timeEl = bar.querySelector('.task-time');
    if (timeEl) {
      timeEl.textContent = this.formatElapsed(elapsed);
    }

    // Flash if overdue
    if (elapsed >= this.config.targetSeconds) {
      bar.classList.add('flashing');
    } else {
      bar.classList.remove('flashing');
    }
  },

  // Update all bars (called every second)
  updateBars() {
    const bars = document.querySelectorAll('.task-bar');
    bars.forEach(bar => {
      const taskId = parseInt(bar.dataset.taskId);
      const task = this.tasks.find(t => t.TaskID === taskId);
      if (task) {
        this.updateTaskBar(bar, task);
      }
    });
  },

  // Get elapsed seconds since task creation
  getElapsedSeconds(createdOn) {
    const created = new Date(createdOn);
    const now = new Date();
    return Math.floor((now - created) / 1000);
  },

  // Format elapsed time as mm:ss
  formatElapsed(seconds) {
    const mins = Math.floor(seconds / 60);
    const secs = seconds % 60;
    return `${mins}:${String(secs).padStart(2, '0')}`;
  },

  // Get category name - use task's category name if available, fall back to hardcoded
  getCategoryName(task) {
    if (task && task.TaskCategoryName) {
      return task.TaskCategoryName;
    }
    return this.categories[task?.TaskCategoryID]?.name || 'Task';
  },

  // Get category color - use task's category color if available, fall back to hardcoded
  getCategoryColor(task) {
    if (task && task.TaskCategoryColor) {
      return task.TaskCategoryColor;
    }
    return this.categories[task?.TaskCategoryID]?.color || '#888888';
  },

  // Handle bar press (start long press timer)
  onBarPress(task, e) {
    e.preventDefault();
    this.longPressTimer = setTimeout(() => {
      this.acceptTaskDirect(task);
    }, 800); // 800ms for long press
  },

  // Handle bar release (cancel long press)
  onBarRelease() {
    if (this.longPressTimer) {
      clearTimeout(this.longPressTimer);
      this.longPressTimer = null;
    }
  },

  // Handle bar tap (show details)
  onBarTap(task) {
    if (this.longPressTimer) {
      clearTimeout(this.longPressTimer);
      this.longPressTimer = null;
    }
    this.showTaskDetails(task);
  },

  // Show task details overlay
  showTaskDetails(task) {
    this.selectedTask = task;
    const overlay = document.getElementById('taskOverlay');
    const detail = document.getElementById('taskDetail');

    const elapsed = this.getElapsedSeconds(task.TaskCreatedOn);
    const categoryName = this.getCategoryName(task);
    const categoryColor = this.getCategoryColor(task);

    document.getElementById('detailTitle').textContent = task.TaskTitle || `Task #${task.TaskID}`;
    document.getElementById('detailCategory').textContent = categoryName;
    document.getElementById('detailCreated').textContent = new Date(task.TaskCreatedOn).toLocaleTimeString();
    document.getElementById('detailWaiting').textContent = this.formatElapsed(elapsed);
    document.getElementById('detailInfo').textContent = task.TaskDetails || '-';

    detail.style.setProperty('--detail-color', categoryColor);
    overlay.classList.add('visible');
  },

  // Close overlay
  closeOverlay() {
    document.getElementById('taskOverlay').classList.remove('visible');
    this.selectedTask = null;
  },

  // Accept task from overlay
  acceptTask() {
    if (this.selectedTask) {
      this.acceptTaskDirect(this.selectedTask);
      this.closeOverlay();
    }
  },

  // Accept task directly (long press or button)
  async acceptTaskDirect(task) {
    console.log('[HUD] Accepting task:', task.TaskID);

    try {
      const response = await fetch(`${this.config.apiBaseUrl}/accept.cfm`, {
        method: 'POST',
        headers: { 'Content-Type': 'application/json' },
        body: JSON.stringify({
          TaskID: task.TaskID,
          BusinessID: this.config.businessId
        })
      });

      const data = await response.json();

      if (data.OK) {
        // Remove from local list immediately
        this.tasks = this.tasks.filter(t => t.TaskID !== task.TaskID);
        this.renderTasks();
        this.showFeedback('Task accepted!', 'success');
      } else {
        this.showFeedback(data.ERROR || 'Failed to accept', 'error');
      }
    } catch (err) {
      console.error('[HUD] Accept error:', err);
      // Demo mode: just remove locally
      this.tasks = this.tasks.filter(t => t.TaskID !== task.TaskID);
      this.renderTasks();
      this.showFeedback('Task accepted!', 'success');
    }
  },

  // Show feedback message
  showFeedback(message, type) {
    // Simple console feedback for now
    console.log(`[HUD] ${type}: ${message}`);
    // TODO: Add toast notification
  },

  // Set connection status
  setConnected(connected) {
    this.isConnected = connected;
    const indicator = document.getElementById('statusIndicator');
    if (connected) {
      indicator.classList.remove('disconnected');
    } else {
      indicator.classList.add('disconnected');
    }
  }
};

// Global functions for onclick handlers
function closeOverlay() {
  HUD.closeOverlay();
}

function acceptTask() {
  HUD.acceptTask();
}

// Initialize on load
document.addEventListener('DOMContentLoaded', () => {
  HUD.init();
});