feat: implement free trial conversion optimization with A/B testing (Smartdevs17#558)

Author: Eromosele0110

backend/services/trialService.ts

@@ -0,0 +1,192 @@
+import {
+  TrialConfig,
+  ABTestAssignment,
+  ConversionFunnelEvent,
+  TrialReminderSchedule,
+  TrialStatus,
+  TrialDuration,
+  TrialFeatureAccess,
+  PaymentRequirement,
+} from '../../src/types/trial';
+
+interface BackendTrialConfig {
+  id: string;
+  subscriptionId: string;
+  duration: TrialDuration;
+  featureAccess: TrialFeatureAccess;
+  paymentRequirement: PaymentRequirement;
+  abTestId?: string;
+  status: TrialStatus;
+  startDate?: string;
+  endDate?: string;
+  convertedAt?: string;
+  reminderScheduleId?: string;
+  metadata?: Record<string, any>;
+  createdAt: string;
+  updatedAt: string;
+}
+
+interface BackendABTestAssignment {
+  id: string;
+  abTestId: string;
+  userId: string;
+  variantName: string;
+  assignedAt: string;
+  cohort?: string;
+}
+
+interface BackendConversionFunnelEvent {
+  id: string;
+  trialConfigId: string;
+  eventType: ConversionFunnelEvent['eventType'];
+  userId: string;
+  variantName?: string;
+  timestamp: string;
+  metadata?: Record<string, any>;
+}
+
+export class BackendTrialService {
+  private trialConfigs: Map<string, BackendTrialConfig> = new Map();
+  private assignments: Map<string, BackendABTestAssignment> = new Map();
+  private funnelEvents: Map<string, BackendConversionFunnelEvent> = new Map();
+
+  createTrialConfig(
+    subscriptionId: string,
+    duration: TrialDuration,
+    featureAccess: TrialFeatureAccess,
+    paymentRequirement: PaymentRequirement,
+    abTestId?: string
+  ): BackendTrialConfig {
+    const now = new Date().toISOString();
+    const endDate = new Date();
+    switch (duration) {
+      case TrialDuration.SEVEN_DAYS:
+        endDate.setDate(endDate.getDate() + 7);
+        break;
+      case TrialDuration.FOURTEEN_DAYS:
+        endDate.setDate(endDate.getDate() + 14);
+        break;
+      case TrialDuration.TWENTY_ONE_DAYS:
+        endDate.setDate(endDate.getDate() + 21);
+        break;
+      case TrialDuration.THIRTY_DAYS:
+        endDate.setDate(endDate.getDate() + 30);
+        break;
+    }
+
+    const config: BackendTrialConfig = {
+      id: `${subscriptionId}-${Date.now()}`,
+      subscriptionId,
+      duration,
+      featureAccess,
+      paymentRequirement,
+      abTestId,
+      status: TrialStatus.ACTIVE,
+      startDate: now,
+      endDate: endDate.toISOString(),
+      createdAt: now,
+      updatedAt: now,
+    };
+
+    this.trialConfigs.set(config.id, config);
+    return config;
+  }
+
+  validateTrialConfig(config: Partial<BackendTrialConfig>): { valid: boolean; errors: string[] } {
+    const errors: string[] = [];
+
+    if (!config.subscriptionId) {
+      errors.push('Subscription ID is required');
+    }
+    if (!config.duration) {
+      errors.push('Trial duration is required');
+    }
+    if (!config.featureAccess) {
+      errors.push('Feature access is required');
+    }
+    if (!config.paymentRequirement) {
+      errors.push('Payment requirement is required');
+    }
+
+    return { valid: errors.length === 0, errors };
+  }
+
+  assignABTest(abTestId: string, userId: string, variantName: string, cohort?: string): BackendABTestAssignment {
+    const assignment: BackendABTestAssignment = {
+      id: `${abTestId}-${userId}-${Date.now()}`,
+      abTestId,
+      userId,
+      variantName,
+      assignedAt: new Date().toISOString(),
+      cohort,
+    };
+
+    this.assignments.set(assignment.id, assignment);
+    return assignment;
+  }
+
+  processFunnelEvent(event: Omit<BackendConversionFunnelEvent, 'id' | 'timestamp'>): BackendConversionFunnelEvent {
+    const funnelEvent: BackendConversionFunnelEvent = {
+      ...event,
+      id: `evt-${Date.now()}-${Math.random().toString(36).substring(2, 7)}`,
+      timestamp: new Date().toISOString(),
+    };
+
+    this.funnelEvents.set(funnelEvent.id, funnelEvent);
+    return funnelEvent;
+  }
+
+  getTrialConfig(id: string): BackendTrialConfig | undefined {
+    return this.trialConfigs.get(id);
+  }
+
+  getTrialConfigBySubscription(subscriptionId: string): BackendTrialConfig | undefined {
+    for (const config of this.trialConfigs.values()) {
+      if (config.subscriptionId === subscriptionId) {
+        return config;
+      }
+    }
+    return undefined;
+  }
+
+  getAssignmentsForTest(abTestId: string): BackendABTestAssignment[] {
+    return Array.from(this.assignments.values()).filter((a) => a.abTestId === abTestId);
+  }
+
+  getFunnelEvents(trialConfigId: string): BackendConversionFunnelEvent[] {
+    return Array.from(this.funnelEvents.values()).filter((e) => e.trialConfigId === trialConfigId);
+  }
+
+  getConversionStats(abTestId?: string): { totalTrials: number; convertedTrials: number; conversionRate: number } {
+    const configs = abTestId
+      ? Array.from(this.trialConfigs.values()).filter((c) => c.abTestId === abTestId)
+      : Array.from(this.trialConfigs.values());
+
+    const totalTrials = configs.length;
+    const convertedTrials = configs.filter((c) => c.status === TrialStatus.CONVERTED).length;
+    const conversionRate = totalTrials > 0 ? convertedTrials / totalTrials : 0;
+
+    return { totalTrials, convertedTrials, conversionRate };
+  }
+
+  convertTrial(trialId: string): BackendTrialConfig | undefined {
+    const config = this.trialConfigs.get(trialId);
+    if (!config) return undefined;
+
+    config.status = TrialStatus.CONVERTED;
+    config.convertedAt = new Date().toISOString();
+    config.updatedAt = new Date().toISOString();
+    return config;
+  }
+
+  expireTrial(trialId: string): BackendTrialConfig | undefined {
+    const config = this.trialConfigs.get(trialId);
+    if (!config) return undefined;
+
+    config.status = TrialStatus.EXPIRED;
+    config.updatedAt = new Date().toISOString();
+    return config;
+  }
+}
+
+export const backendTrialService = new BackendTrialService();

src/navigation/AppNavigator.tsx

@@ -77,6 +77,7 @@ const PaymentMethodsScreen = lazyScreen(() =>
   }))
 );
 const AnalyticsDashboard = lazyScreen(() => import('../../app/screens/AnalyticsDashboard'));
+const TrialDetailsScreen = lazyScreen(() => import('../screens/TrialDetailsScreen'));
 
 const Tab = createBottomTabNavigator<TabParamList>();
 const Stack = createNativeStackNavigator<RootStackParamList>();
@@ -199,6 +200,11 @@ const HomeStack = () => (
       component={IntegrationGuidesScreen}
       options={{ headerShown: false }}
     />
+    <Stack.Screen
+      name="TrialDetails"
+      component={TrialDetailsScreen}
+      options={{ title: 'Trial Details', headerShown: true }}
+    />
   </Stack.Navigator>
 );
 

src/navigation/types.ts

@@ -48,6 +48,7 @@ export type RootStackParamList = {
   ChangePlan: { subscriptionId: string };
   PaymentMethods: undefined;
   AnalyticsDashboard: undefined;
+  TrialDetails: undefined;
   NotFound: { reason?: string };
 };