Feat: implement subscription price optimization engine

app/screens/PricingOptimizationScreen.tsx

@@ -0,0 +1,336 @@
+import React, { useState, useEffect } from 'react';
+import {
+  View,
+  Text,
+  StyleSheet,
+  ScrollView,
+  TouchableOpacity,
+  ActivityIndicator,
+} from 'react-native';
+import { colors, spacing } from '../../src/utils/constants';
+import { Card } from '../../src/components/common/Card';
+import { Button } from '../../src/components/common/Button';
+import {
+  PricingService,
+  PriceRecommendation,
+  ABTestScenario,
+} from '../../backend/services/pricingService';
+
+const PricingOptimizationScreen = () => {
+  const [loading, setLoading] = useState(true);
+  const [recommendation, setRecommendation] = useState<PriceRecommendation | null>(null);
+  const [abTests, setAbTests] = useState<ABTestScenario[]>([]);
+  const [activeTest, setActiveTest] = useState<string | null>(null);
+
+  useEffect(() => {
+    fetchData();
+  }, []);
+
+  const fetchData = async () => {
+    setLoading(true);
+    try {
+      const rec = await PricingService.calculateOptimalPrice('sub_123', {
+        current_price: 14.99,
+        competitor_avg: 12.99,
+        current_demand: 1.2,
+        usage_data: {
+          retention_rate: 0.85,
+          sessions_per_week: 10,
+        },
+      });
+      const tests = await PricingService.getPriceRecommendations('plan_gold');
+      setRecommendation(rec);
+      setAbTests(tests);
+    } catch (error) {
+      console.error(error);
+    } finally {
+      setLoading(false);
+    }
+  };
+
+  const renderMetric = (label: string, value: string | number, subtext?: string) => (
+    <View style={styles.metricContainer}>
+      <Text style={styles.metricLabel}>{label}</Text>
+      <Text style={styles.metricValue}>{value}</Text>
+      {subtext && <Text style={styles.metricSubtext}>{subtext}</Text>}
+    </View>
+  );
+
+  if (loading) {
+    return (
+      <View style={styles.loadingContainer}>
+        <ActivityIndicator size="large" color={colors.primary} />
+      </View>
+    );
+  }
+
+  return (
+    <ScrollView style={styles.container}>
+      <View style={styles.header}>
+        <Text style={styles.title}>Pricing Optimization</Text>
+        <Text style={styles.subtitle}>AI-Powered Revenue Maximization</Text>
+      </View>
+
+      <Card style={styles.mainCard}>
+        <Text style={styles.cardTitle}>Optimal Price Recommendation</Text>
+        <View style={styles.priceRow}>
+          <Text style={styles.currentPrice}>$14.99</Text>
+          <Text style={styles.arrow}>→</Text>
+          <Text style={styles.optimalPrice}>${recommendation?.optimalPrice}</Text>
+        </View>
+        <View
+          style={[
+            styles.badge,
+            {
+              backgroundColor:
+                recommendation?.recommendation === 'Increase' ? '#E6F4EA' : '#FCE8E6',
+            },
+          ]}>
+          <Text
+            style={[
+              styles.badgeText,
+              { color: recommendation?.recommendation === 'Increase' ? '#1E8E3E' : '#D93025' },
+            ]}>
+            {recommendation?.recommendation} Recommendation
+          </Text>
+        </View>
+
+        <View style={styles.factorsGrid}>
+          {renderMetric('Demand Factor', `${recommendation?.factors.demandImpact}x`, 'High Demand')}
+          {renderMetric(
+            'Comp. Avg',
+            `$${recommendation?.factors.competitorBenchmark}`,
+            'Market Bench'
+          )}
+          {renderMetric('WTP Est.', `$${recommendation?.factors.willingnessToPay}`, 'User Value')}
+        </View>
+      </Card>
+
+      <View style={styles.section}>
+        <Text style={styles.sectionTitle}>A/B Testing Strategies</Text>
+        {abTests.map((test, index) => (
+          <TouchableOpacity
+            key={index}
+            style={[styles.testCard, activeTest === test.tier && styles.activeTestCard]}
+            onPress={() => setActiveTest(test.tier)}>
+            <View style={styles.testHeader}>
+              <Text style={styles.testTier}>{test.tier}</Text>
+              <Text style={styles.testPrice}>${test.price}</Text>
+            </View>
+            <Text style={styles.testReasoning}>{test.reasoning}</Text>
+            {activeTest === test.tier && (
+              <View style={styles.activeBadge}>
+                <Text style={styles.activeBadgeText}>ACTIVE TEST</Text>
+              </View>
+            )}
+          </TouchableOpacity>
+        ))}
+      </View>
+
+      <View style={styles.section}>
+        <Text style={styles.sectionTitle}>Demand Forecast</Text>
+        <Card style={styles.chartPlaceholder}>
+          <View style={styles.barChart}>
+            {[40, 60, 45, 90, 75, 80, 95].map((h, i) => (
+              <View key={i} style={[styles.bar, { height: h }]} />
+            ))}
+          </View>
+          <View style={styles.chartLabels}>
+            {['M', 'T', 'W', 'T', 'F', 'S', 'S'].map((l, i) => (
+              <Text key={i} style={styles.chartLabel}>
+                {l}
+              </Text>
+            ))}
+          </View>
+        </Card>
+      </View>
+
+      <Button title="Apply Recommended Pricing" onPress={() => {}} style={styles.applyButton} />
+      <View style={{ height: 40 }} />
+    </ScrollView>
+  );
+};
+
+const styles = StyleSheet.create({
+  container: {
+    flex: 1,
+    backgroundColor: colors.background,
+  },
+  loadingContainer: {
+    flex: 1,
+    justifyContent: 'center',
+    alignItems: 'center',
+  },
+  header: {
+    padding: spacing.xl,
+    paddingTop: 60,
+    backgroundColor: colors.surface,
+  },
+  title: {
+    fontSize: 28,
+    fontWeight: 'bold',
+    color: colors.text,
+  },
+  subtitle: {
+    fontSize: 16,
+    color: colors.textSecondary,
+    marginTop: 4,
+  },
+  mainCard: {
+    margin: spacing.lg,
+    padding: spacing.xl,
+    alignItems: 'center',
+  },
+  cardTitle: {
+    fontSize: 18,
+    fontWeight: '600',
+    color: colors.textSecondary,
+    marginBottom: spacing.lg,
+  },
+  priceRow: {
+    flexDirection: 'row',
+    alignItems: 'center',
+    marginBottom: spacing.md,
+  },
+  currentPrice: {
+    fontSize: 24,
+    color: colors.textSecondary,
+    textDecorationLine: 'line-through',
+  },
+  arrow: {
+    fontSize: 24,
+    marginHorizontal: spacing.md,
+    color: colors.textSecondary,
+  },
+  optimalPrice: {
+    fontSize: 36,
+    fontWeight: 'bold',
+    color: colors.primary,
+  },
+  badge: {
+    paddingHorizontal: spacing.md,
+    paddingVertical: spacing.xs,
+    borderRadius: 12,
+    marginBottom: spacing.xl,
+  },
+  badgeText: {
+    fontSize: 12,
+    fontWeight: 'bold',
+  },
+  factorsGrid: {
+    flexDirection: 'row',
+    justifyContent: 'space-between',
+    width: '100%',
+    borderTopWidth: 1,
+    borderTopColor: colors.border,
+    paddingTop: spacing.lg,
+  },
+  metricContainer: {
+    alignItems: 'center',
+    flex: 1,
+  },
+  metricLabel: {
+    fontSize: 12,
+    color: colors.textSecondary,
+    marginBottom: 4,
+  },
+  metricValue: {
+    fontSize: 18,
+    fontWeight: 'bold',
+    color: colors.text,
+  },
+  metricSubtext: {
+    fontSize: 10,
+    color: colors.textSecondary,
+    marginTop: 2,
+  },
+  section: {
+    paddingHorizontal: spacing.lg,
+    marginBottom: spacing.xl,
+  },
+  sectionTitle: {
+    fontSize: 18,
+    fontWeight: 'bold',
+    color: colors.text,
+    marginBottom: spacing.md,
+  },
+  testCard: {
+    backgroundColor: colors.surface,
+    padding: spacing.lg,
+    borderRadius: 12,
+    marginBottom: spacing.md,
+    borderWidth: 1,
+    borderColor: colors.border,
+  },
+  activeTestCard: {
+    borderColor: colors.primary,
+    backgroundColor: '#F8F9FF',
+  },
+  testHeader: {
+    flexDirection: 'row',
+    justifyContent: 'space-between',
+    alignItems: 'center',
+    marginBottom: spacing.xs,
+  },
+  testTier: {
+    fontSize: 16,
+    fontWeight: 'bold',
+    color: colors.text,
+  },
+  testPrice: {
+    fontSize: 18,
+    fontWeight: 'bold',
+    color: colors.primary,
+  },
+  testReasoning: {
+    fontSize: 14,
+    color: colors.textSecondary,
+  },
+  activeBadge: {
+    position: 'absolute',
+    top: -8,
+    right: 12,
+    backgroundColor: colors.primary,
+    paddingHorizontal: 8,
+    paddingVertical: 2,
+    borderRadius: 4,
+  },
+  activeBadgeText: {
+    color: 'white',
+    fontSize: 10,
+    fontWeight: 'bold',
+  },
+  chartPlaceholder: {
+    padding: spacing.lg,
+    alignItems: 'center',
+  },
+  barChart: {
+    flexDirection: 'row',
+    alignItems: 'flex-end',
+    justifyContent: 'space-around',
+    width: '100%',
+    height: 100,
+  },
+  bar: {
+    width: 20,
+    backgroundColor: colors.primary,
+    borderRadius: 4,
+    opacity: 0.7,
+  },
+  chartLabels: {
+    flexDirection: 'row',
+    justifyContent: 'space-around',
+    width: '100%',
+    marginTop: spacing.md,
+  },
+  chartLabel: {
+    fontSize: 10,
+    color: colors.textSecondary,
+  },
+  applyButton: {
+    marginHorizontal: spacing.lg,
+    marginTop: spacing.md,
+  },
+});
+
+export default PricingOptimizationScreen;