/**
 * useCamera Hook
 * React hook for camera operations
 */

import { useState, useEffect, useRef, useCallback } from 'react';
import { Camera, useCameraDevices } from 'react-native-vision-camera';

export function useCamera() {
  const [hasPermission, setHasPermission] = useState(false);
  const [isActive, setIsActive] = useState(true);
  const [flashMode, setFlashMode] = useState('auto');
  const [zoom, setZoom] = useState(0);
  const [isCapturing, setIsCapturing] = useState(false);
  
  const cameraRef = useRef(null);
  const devices = useCameraDevices();
  const device = devices.back;

  // Check permission on mount
  useEffect(() => {
    checkPermission();
  }, []);

  const checkPermission = async () => {
    const status = await Camera.requestCameraPermission();
    setHasPermission(status === 'authorized');
  };

  /**
   * Capture photo
   */
  const capturePhoto = useCallback(async (options = {}) => {
    if (!cameraRef.current || isCapturing) {
      throw new Error('Camera not ready');
    }

    setIsCapturing(true);

    try {
      const photo = await cameraRef.current.takePhoto({
        qualityPrioritization: options.quality || 'quality',
        flash: options.flash || flashMode,
        enableShutterSound: options.shutterSound !== false,
      });

      return {
        path: photo.path,
        width: photo.width,
        height: photo.height,
        timestamp: new Date().toISOString(),
      };
    } catch (error) {
      console.error('Capture failed:', error);
      throw error;
    } finally {
      setIsCapturing(false);
    }
  }, [flashMode, isCapturing]);

  /**
   * Toggle flash mode
   */
  const toggleFlash = useCallback(() => {
    setFlashMode(prev => {
      const modes = ['off', 'auto', 'on'];
      const currentIndex = modes.indexOf(prev);
      return modes[(currentIndex + 1) % modes.length];
    });
  }, []);

  /**
   * Set zoom level
   */
  const setZoomLevel = useCallback((level) => {
    setZoom(Math.max(0, Math.min(1, level)));
  }, []);

  /**
   * Focus on point
   */
  const focus = useCallback(async (point) => {
    if (cameraRef.current) {
      await cameraRef.current.focus(point);
    }
  }, []);

  return {
    // Refs
    cameraRef,
    
    // State
    hasPermission,
    isActive,
    flashMode,
    zoom,
    isCapturing,
    device,
    
    // Actions
    capturePhoto,
    toggleFlash,
    setZoomLevel,
    focus,
    setIsActive,
  };
}