/**
 * CameraView Component
 * Advanced camera with real-time evidence overlay
 */

import React, { useState, useEffect, useRef } from 'react';
import {
  View,
  Text,
  StyleSheet,
  TouchableOpacity,
  Animated,
  Dimensions,
} from 'react-native';
import { Camera, useCameraDevices } from 'react-native-vision-camera';
import Icon from 'react-native-vector-icons/MaterialIcons';

const { width, height } = Dimensions.get('window');

export default function CameraView({ onCapture, mission, evidence }) {
  const [hasPermission, setHasPermission] = useState(false);
  const [isCapturing, setIsCapturing] = useState(false);
  const [flashMode, setFlashMode] = useState('auto');
  const [zoom, setZoom] = useState(0);
  
  const camera = useRef(null);
  const devices = useCameraDevices();
  const device = devices.back;
  
  const pulseAnim = useRef(new Animated.Value(1)).current;
  
  // Pulse animation for capture button
  useEffect(() => {
    const pulse = Animated.loop(
      Animated.sequence([
        Animated.timing(pulseAnim, {
          toValue: 1.1,
          duration: 1000,
          useNativeDriver: true,
        }),
        Animated.timing(pulseAnim, {
          toValue: 1,
          duration: 1000,
          useNativeDriver: true,
        }),
      ])
    );
    pulse.start();
    return () => pulse.stop();
  }, []);
  
  // Check permissions
  useEffect(() => {
    checkPermission();
  }, []);
  
  const checkPermission = async () => {
    const status = await Camera.requestCameraPermission();
    setHasPermission(status === 'authorized');
  };
  
  // Capture photo
  const capturePhoto = async () => {
    if (!camera.current || isCapturing) return;
    
    setIsCapturing(true);
    
    try {
      const photo = await camera.current.takePhoto({
        qualityPrioritization: 'quality',
        flash: flashMode,
        enableShutterSound: true,
      });
      
      onCapture(photo);
    } catch (error) {
      console.error('Capture failed:', error);
    } finally {
      setIsCapturing(false);
    }
  };
  
  // Toggle flash
  const toggleFlash = () => {
    const modes = ['off', 'auto', 'on'];
    const currentIndex = modes.indexOf(flashMode);
    setFlashMode(modes[(currentIndex + 1) % modes.length]);
  };
  
  // Get flash icon
  const getFlashIcon = () => {
    switch (flashMode) {
      case 'on': return 'flash-on';
      case 'off': return 'flash-off';
      default: return 'flash-auto';
    }
  };
  
  if (!device) {
    return (
      <View style={styles.loadingContainer}>
        <Text style={styles.loadingText}>Loading camera...</Text>
      </View>
    );
  }
  
  return (
    <View style={styles.container}>
      {/* Camera */}
      <Camera
        ref={camera}
        style={styles.camera}
        device={device}
        isActive={true}
        photo={true}
        zoom={zoom}
      />
      
      {/* Evidence Overlay */}
      {evidence && (
        <View style={styles.evidenceOverlay}>
          <View style={styles.evidenceBadge}>
            <Icon name="search" size={16} color="#fff" />
            <Text style={styles.evidenceText}>
              {evidence.visual_objects || 0} objects detected
            </Text>
          </View>
        </View>
      )}
      
      {/* Mission Overlay */}
      {mission && (
        <View style={styles.missionOverlay}>
          <View style={styles.missionCard}>
            <Text style={styles.missionTitle}>{mission.title}</Text>
            <Text style={styles.missionReward}>${mission.reward_usd}</Text>
          </View>
        </View>
      )}
      
      {/* Top Controls */}
      <View style={styles.topControls}>
        <TouchableOpacity onPress={toggleFlash} style={styles.controlButton}>
          <Icon name={getFlashIcon()} size={24} color="#fff" />
        </TouchableOpacity>
        
        <TouchableOpacity 
          onPress={() => setZoom(zoom === 0 ? 0.5 : 0)} 
          style={styles.controlButton}
        >
          <Icon name={zoom > 0 ? 'zoom-out' : 'zoom-in'} size={24} color="#fff" />
        </TouchableOpacity>
      </View>
      
      {/* Bottom Controls */}
      <View style={styles.bottomControls}>
        {/* Capture Button */}
        <Animated.View style={[styles.captureButton, { transform: [{ scale: pulseAnim }] }]}>
          <TouchableOpacity
            onPress={capturePhoto}
            disabled={isCapturing}
            style={styles.captureInner}
          >
            {isCapturing ? (
              <Icon name="hourglass-empty" size={32} color="#fff" />
            ) : (
              <View style={styles.captureCircle} />
            )}
          </TouchableOpacity>
        </Animated.View>
      </View>
      
      {/* Grid Overlay */}
      <View style={styles.gridOverlay} pointerEvents="none">
        <View style={styles.gridLine} />
        <View style={[styles.gridLine, styles.gridLineVertical]} />
      </View>
    </View>
  );
}

const styles = StyleSheet.create({
  container: {
    flex: 1,
    backgroundColor: '#000',
  },
  loadingContainer: {
    flex: 1,
    justifyContent: 'center',
    alignItems: 'center',
    backgroundColor: '#000',
  },
  loadingText: {
    color: '#fff',
    fontSize: 16,
  },
  camera: {
    flex: 1,
  },
  evidenceOverlay: {
    position: 'absolute',
    top: 100,
    left: 16,
  },
  evidenceBadge: {
    flexDirection: 'row',
    alignItems: 'center',
    backgroundColor: 'rgba(0,122,255,0.8)',
    paddingHorizontal: 12,
    paddingVertical: 6,
    borderRadius: 16,
  },
  evidenceText: {
    color: '#fff',
    fontSize: 12,
    fontWeight: '600',
    marginLeft: 4,
  },
  missionOverlay: {
    position: 'absolute',
    top: 100,
    right: 16,
  },
  missionCard: {
    backgroundColor: 'rgba(52,199,89,0.9)',
    padding: 12,
    borderRadius: 12,
    minWidth: 120,
  },
  missionTitle: {
    color: '#fff',
    fontSize: 12,
    fontWeight: '600',
  },
  missionReward: {
    color: '#fff',
    fontSize: 16,
    fontWeight: '700',
    marginTop: 4,
  },
  topControls: {
    position: 'absolute',
    top: 50,
    left: 0,
    right: 0,
    flexDirection: 'row',
    justifyContent: 'space-between',
    paddingHorizontal: 16,
  },
  controlButton: {
    width: 44,
    height: 44,
    borderRadius: 22,
    backgroundColor: 'rgba(0,0,0,0.5)',
    justifyContent: 'center',
    alignItems: 'center',
  },
  bottomControls: {
    position: 'absolute',
    bottom: 100,
    left: 0,
    right: 0,
    alignItems: 'center',
  },
  captureButton: {
    width: 80,
    height: 80,
    borderRadius: 40,
    backgroundColor: 'rgba(255,255,255,0.3)',
    justifyContent: 'center',
    alignItems: 'center',
  },
  captureInner: {
    width: 70,
    height: 70,
    borderRadius: 35,
    backgroundColor: '#fff',
    justifyContent: 'center',
    alignItems: 'center',
  },
  captureCircle: {
    width: 60,
    height: 60,
    borderRadius: 30,
    backgroundColor: '#fff',
  },
  gridOverlay: {
    position: 'absolute',
    top: 0,
    left: 0,
    right: 0,
    bottom: 0,
  },
  gridLine: {
    position: 'absolute',
    top: '33%',
    left: 0,
    right: 0,
    height: 1,
    backgroundColor: 'rgba(255,255,255,0.2)',
  },
  gridLineVertical: {
    top: 0,
    left: '33%',
    width: 1,
    height: '100%',
  },
});