// QR Scanner Module - Self-contained QR scanning page
// Adapted from existing camera implementation

Page({
  /**
   * Page initial data
   */
  data: {
    hint_text: '查找二维码',
    enable_debug: false,
    camera_flash: 'off',
    phone_model: 'unknown',
    zoom: -1,
    max_zoom: 1,
    use_worker: false,
    show_tip: false,
    show_modal: '',
    busy: true,
    should_check_auto_torch: true,
    done_checking_auto_torch: false,
    camera_sensitivity: 1,
    frame_uploaded: 0,
    frame_upload_time_cost: 0,
    qrarc_class: 'sm',
    qrmarkers_class: 'hidden',
    frame_upload_interval_ms: 2000,
    return_page: '', // Page to navigate to after successful scan
    server_url: 'https://themblem.com', // Default server URL
    debug_msgs: [],
    debug_image_data_url: ''
  },

  /**
   * Lifecycle function--Called when page load
   */
  onLoad(options) {
    console.log('QR Scanner module loaded', options);
    
    // Store return page from query parameters
    if (options.return_page) {
      this.setData({
        return_page: options.return_page
      });
    }

    // Initialize image data storage
    this.image_data_urls = [];
    
    // Get system information
    this.initializeSystem();
    
    // Load camera rules
    this.loadCameraRules();
  },

  /**
   * Initialize system information and device detection
   */
  initializeSystem() {
    const systemInfo = wx.getSystemInfoSync();
    const phone_model = systemInfo.model;
    const use_worker = phone_model.toLowerCase().includes('iphone');
    
    this.setData({
      phone_model,
      window_width: systemInfo.windowWidth,
      window_height: systemInfo.windowHeight,
      use_worker
    });

    console.log(`Phone model: ${phone_model}, Use worker: ${use_worker}`);

    // Initialize worker for iPhone devices
    if (use_worker) {
      this.initializeWorker();
    }
  },

  /**
   * Initialize WebAssembly worker for QR processing
   */
  initializeWorker() {
    // TODO: Initialize worker - requires qrtool.wx.js and worker setup
    console.log('Worker initialization would happen here');
  },

  /**
   * Load camera rules from API
   */
  loadCameraRules() {
    // TODO: Implement camera rules loading from API
    console.log('Camera rules loading would happen here');
    
    // For now, set default values
    this.setData({
      zoom: 1,
      camera_sensitivity: 1,
      busy: false
    });
  },

  /**
   * Camera initialization callback
   */
  setup_camera(e) {
    console.log('Camera setup', e);
    this.camera_context = wx.createCameraContext();
    
    // Set up camera frame listener
    this.camera_context.onCameraFrame((frame) => {
      this.processFrame(frame);
    });

    this.setData({
      busy: false,
      hint_text: '查找二维码'
    });
  },

  /**
   * Process camera frame for QR detection
   */
  processFrame(frame) {
    if (this.data.busy) return;
    
    // TODO: Implement QR detection logic
    console.log('Processing frame', frame.width, frame.height);
    
    // For demo purposes, simulate QR detection
    if (Math.random() < 0.01) { // 1% chance to simulate QR found
      this.simulateQRFound();
    }
  },

  /**
   * Simulate QR code found (for testing)
   */
  simulateQRFound() {
    this.setData({
      hint_text: '识别成功',
      show_modal: 'verifying'
    });

    // Simulate verification process
    setTimeout(() => {
      this.onVerificationSuccess('test-qr-code');
    }, 2000);
  },

  /**
   * Handle successful QR verification
   */
  onVerificationSuccess(qrCode) {
    console.log('QR verification successful:', qrCode);
    
    if (this.data.return_page) {
      wx.navigateTo({
        url: `${this.data.return_page}?qr_code=${encodeURIComponent(qrCode)}`,
        success: () => {
          console.log(`Navigated to return page: ${this.data.return_page}`);
        },
        fail: (err) => {
          console.error('Failed to navigate to return page:', err);
          this.restart_camera();
        }
      });
    } else {
      console.warn('No return page specified');
      this.restart_camera();
    }
  },

  /**
   * Toggle torch/flash
   */
  toggle_torch() {
    const newFlash = this.data.camera_flash === 'torch' ? 'off' : 'torch';
    this.setData({
      camera_flash: newFlash
    });
    console.log('Torch toggled to:', newFlash);
  },

  /**
   * Show scan guide
   */
  show_scanguide() {
    this.setData({
      show_modal: 'scanguide',
      show_tip: false
    });
  },

  /**
   * Show service modal
   */
  show_service() {
    this.setData({
      show_modal: 'service'
    });
  },

  /**
   * Close modal and restart camera
   */
  restart_camera() {
    this.setData({
      show_modal: '',
      hint_text: '查找二维码',
      busy: false
    });
  },

  /**
   * Close any modal
   */
  close_modal() {
    this.setData({
      show_modal: ''
    });
  },

  /**
   * Debug tap handler
   */
  debug_tap() {
    const count = (this.debug_tap_count || 0) + 1;
    this.debug_tap_count = count;
    
    if (count >= 5) {
      this.setData({
        enable_debug: !this.data.enable_debug
      });
      this.debug_tap_count = 0;
    }
    
    // Clear count after 3 seconds
    setTimeout(() => {
      this.debug_tap_count = 0;
    }, 3000);
  },

  /**
   * Generate hint text based on QR detection result
   */
  make_hint_text(result) {
    if (result && result.qrcode && result.qrcode.length > 0) {
      const err = result.err || '';
      if (err.includes('margin too small')) {
        return '对齐定位点';
      } else if (err.includes('energy check failed') || err.includes('cannot detect angle')) {
        return '移近一点';
      }
      return '对齐定位点';
    }
    return '查找二维码';
  }
});