/**
 * StatsView Component
 * Zoomer statistics and earnings dashboard
 */

import React from 'react';
import {
  View,
  Text,
  StyleSheet,
  ScrollView,
  Animated,
} from 'react-native';
import Icon from 'react-native-vector-icons/MaterialIcons';

export default function StatsView({ stats }) {
  const fadeAnim = new Animated.Value(0);

  React.useEffect(() => {
    Animated.timing(fadeAnim, {
      toValue: 1,
      duration: 600,
      useNativeDriver: true,
    }).start();
  }, []);

  const renderStatCard = (icon, title, value, subtitle, color) => (
    <View style={[styles.statCard, { borderLeftColor: color }]}>
      <View style={styles.statIconContainer}>
        <Icon name={icon} size={24} color={color} />
      </View>
      <View style={styles.statContent}>
        <Text style={styles.statValue}>{value}</Text>
        <Text style={styles.statTitle}>{title}</Text>
        {subtitle && <Text style={styles.statSubtitle}>{subtitle}</Text>}
      </View>
    </View>
  );

  const renderLevelProgress = () => {
    const levels = ['Supplementary', 'Active', 'Professional'];
    const currentLevelIndex = levels.indexOf(stats.level);
    const nextLevel = levels[currentLevelIndex + 1];
    const progress = stats.level_progress || 0;

    return (
      <View style={styles.levelCard}>
        <View style={styles.levelHeader}>
          <Text style={styles.levelTitle}>Zoomer Level</Text>
          <View style={[styles.levelBadge, { backgroundColor: getLevelColor(stats.level) }]}>
            <Text style={styles.levelBadgeText}>{stats.level}</Text>
          </View>
        </View>
        
        <View style={styles.levelProgressContainer}>
          <View style={styles.levelProgressBar}>
            <View style={[styles.levelProgressFill, { width: `${progress}%` }]} />
          </View>
          <Text style={styles.levelProgressText}>{progress}% to {nextLevel || 'Max'}</Text>
        </View>

        <View style={styles.levelRequirements}>
          <Text style={styles.levelRequirementsTitle}>Requirements for {nextLevel}:</Text>
          {getLevelRequirements(nextLevel).map((req, index) => (
            <View key={index} style={styles.requirementRow}>
              <Icon 
                name={req.completed ? 'check-circle' : 'radio-button-unchecked'} 
                size={16} 
                color={req.completed ? '#34C759' : '#8E8E93'} 
              />
              <Text style={[styles.requirementText, req.completed && styles.requirementCompleted]}>
                {req.text}
              </Text>
            </View>
          ))}
        </View>
      </View>
    );
  };

  const getLevelColor = (level) => {
    const colors = {
      'Supplementary': '#8E8E93',
      'Active': '#007AFF',
      'Professional': '#34C759',
    };
    return colors[level] || '#8E8E93';
  };

  const getLevelRequirements = (level) => {
    const requirements = {
      'Active': [
        { text: 'Complete 10 missions', completed: (stats.completed_missions || 0) >= 10 },
        { text: 'Earn $500 total', completed: (stats.total_earnings || 0) >= 500 },
        { text: '95% approval rate', completed: (stats.approval_rate || 0) >= 95 },
      ],
      'Professional': [
        { text: 'Complete 50 missions', completed: (stats.completed_missions || 0) >= 50 },
        { text: 'Earn $5,000 total', completed: (stats.total_earnings || 0) >= 5000 },
        { text: '98% approval rate', completed: (stats.approval_rate || 0) >= 98 },
        { text: '5+ countries', completed: (stats.countries || 0) >= 5 },
      ],
    };
    return requirements[level] || [];
  };

  return (
    <Animated.View style={[styles.container, { opacity: fadeAnim }]}>
      <ScrollView style={styles.scrollView}>
        {/* Header */}
        <View style={styles.header}>
          <Text style={styles.headerTitle}>Your Stats</Text>
          <Text style={styles.headerSubtitle}>Last 30 days</Text>
        </View>

        {/* Earnings Card */}
        <View style={styles.earningsCard}>
          <Text style={styles.earningsLabel}>Total Earnings</Text>
          <Text style={styles.earningsValue}>${(stats.total_earnings || 0).toFixed(2)}</Text>
          <View style={styles.earningsTrend}>
            <Icon name="trending-up" size={16} color="#34C759" />
            <Text style={styles.earningsTrendText}>+{(stats.earnings_growth || 0).toFixed(1)}% this month</Text>
          </View>
        </View>

        {/* Stats Grid */}
        <View style={styles.statsGrid}>
          {renderStatCard('camera-alt', 'Observations', stats.total_observations || 0, `${stats.approved_observations || 0} approved`, '#007AFF')}
          {renderStatCard('check-circle', 'Missions', stats.completed_missions || 0, `${stats.active_missions || 0} active`, '#34C759')}
          {renderStatCard('star', 'Rating', `${stats.rating || 0}/5.0`, `${stats.reviews || 0} reviews`, '#FF9500')}
          {renderStatCard('schedule', 'Response Time', `${stats.avg_response_time || 0}h`, 'Average', '#5856D6')}
        </View>

        {/* Level Progress */}
        {renderLevelProgress()}

        {/* Recent Activity */}
        <View style={styles.activityCard}>
          <Text style={styles.activityTitle}>Recent Activity</Text>
          {(stats.recent_activity || []).map((activity, index) => (
            <View key={index} style={styles.activityRow}>
              <View style={[styles.activityIcon, { backgroundColor: activity.color || '#007AFF20' }]}>
                <Icon name={activity.icon || 'circle'} size={16} color={activity.color || '#007AFF'} />
              </View>
              <View style={styles.activityContent}>
                <Text style={styles.activityText}>{activity.text}</Text>
                <Text style={styles.activityTime}>{activity.time}</Text>
              </View>
              {activity.amount && (
                <Text style={[styles.activityAmount, { color: activity.amount > 0 ? '#34C759' : '#FF3B30' }]}>
                  {activity.amount > 0 ? '+' : ''}${Math.abs(activity.amount).toFixed(2)}
                </Text>
              )}
            </View>
          ))}
        </View>
      </ScrollView>
    </Animated.View>
  );
}

const styles = StyleSheet.create({
  container: {
    flex: 1,
    backgroundColor: '#000',
  },
  scrollView: {
    flex: 1,
    padding: 16,
  },
  header: {
    marginBottom: 20,
  },
  headerTitle: {
    fontSize: 28,
    fontWeight: '700',
    color: '#fff',
  },
  headerSubtitle: {
    fontSize: 14,
    color: '#8E8E93',
    marginTop: 4,
  },
  earningsCard: {
    backgroundColor: '#1C1C1E',
    borderRadius: 16,
    padding: 20,
    marginBottom: 16,
    alignItems: 'center',
  },
  earningsLabel: {
    fontSize: 14,
    color: '#8E8E93',
    marginBottom: 8,
  },
  earningsValue: {
    fontSize: 48,
    fontWeight: '700',
    color: '#34C759',
  },
  earningsTrend: {
    flexDirection: 'row',
    alignItems: 'center',
    marginTop: 8,
  },
  earningsTrendText: {
    fontSize: 14,
    color: '#34C759',
    marginLeft: 4,
  },
  statsGrid: {
    flexDirection: 'row',
    flexWrap: 'wrap',
    justifyContent: 'space-between',
    marginBottom: 16,
  },
  statCard: {
    width: '48%',
    backgroundColor: '#1C1C1E',
    borderRadius: 12,
    padding: 16,
    marginBottom: 12,
    borderLeftWidth: 3,
    flexDirection: 'row',
    alignItems: 'center',
  },
  statIconContainer: {
    width: 40,
    height: 40,
    borderRadius: 10,
    backgroundColor: 'rgba(255,255,255,0.05)',
    justifyContent: 'center',
    alignItems: 'center',
    marginRight: 12,
  },
  statContent: {
    flex: 1,
  },
  statValue: {
    fontSize: 24,
    fontWeight: '700',
    color: '#fff',
  },
  statTitle: {
    fontSize: 12,
    color: '#8E8E93',
    marginTop: 2,
  },
  statSubtitle: {
    fontSize: 11,
    color: '#34C759',
    marginTop: 2,
  },
  levelCard: {
    backgroundColor: '#1C1C1E',
    borderRadius: 16,
    padding: 20,
    marginBottom: 16,
  },
  levelHeader: {
    flexDirection: 'row',
    justifyContent: 'space-between',
    alignItems: 'center',
    marginBottom: 12,
  },
  levelTitle: {
    fontSize: 16,
    fontWeight: '600',
    color: '#fff',
  },
  levelBadge: {
    paddingHorizontal: 10,
    paddingVertical: 4,
    borderRadius: 8,
  },
  levelBadgeText: {
    color: '#fff',
    fontSize: 12,
    fontWeight: '700',
  },
  levelProgressContainer: {
    marginBottom: 16,
  },
  levelProgressBar: {
    height: 8,
    backgroundColor: '#2C2C2E',
    borderRadius: 4,
    marginBottom: 8,
  },
  levelProgressFill: {
    height: '100%',
    backgroundColor: '#34C759',
    borderRadius: 4,
  },
  levelProgressText: {
    fontSize: 12,
    color: '#8E8E93',
    textAlign: 'right',
  },
  levelRequirements: {
    borderTopWidth: 1,
    borderTopColor: '#2C2C2E',
    paddingTop: 12,
  },
  levelRequirementsTitle: {
    fontSize: 14,
    fontWeight: '600',
    color: '#fff',
    marginBottom: 8,
  },
  requirementRow: {
    flexDirection: 'row',
    alignItems: 'center',
    marginBottom: 8,
  },
  requirementText: {
    fontSize: 13,
    color: '#8E8E93',
    marginLeft: 8,
  },
  requirementCompleted: {
    color: '#34C759',
    textDecorationLine: 'line-through',
  },
  activityCard: {
    backgroundColor: '#1C1C1E',
    borderRadius: 16,
    padding: 20,
    marginBottom: 16,
  },
  activityTitle: {
    fontSize: 16,
    fontWeight: '600',
    color: '#fff',
    marginBottom: 12,
  },
  activityRow: {
    flexDirection: 'row',
    alignItems: 'center',
    paddingVertical: 10,
    borderBottomWidth: 1,
    borderBottomColor: '#2C2C2E',
  },
  activityIcon: {
    width: 32,
    height: 32,
    borderRadius: 8,
    justifyContent: 'center',
    alignItems: 'center',
    marginRight: 12,
  },
  activityContent: {
    flex: 1,
  },
  activityText: {
    fontSize: 14,
    color: '#fff',
  },
  activityTime: {
    fontSize: 12,
    color: '#8E8E93',
    marginTop: 2,
  },
  activityAmount: {
    fontSize: 14,
    fontWeight: '600',
  },
});