#292 Crowdfunding: Implement campaign analytics

[Purity-Euphemia]

Closes #292

Overview

This PR implements comprehensive campaign analytics functionality for PropChain's real estate crowdfunding platform, providing campaign creators with detailed insights into their fundraising performance, investor demographics, and comparative analytics.

🎯 Key Features Implemented

Analytics Data Structures

• CampaignAnalytics: Comprehensive campaign performance metrics including funding progress, investor statistics, milestone completion rates, risk scoring, and completion projections
• InvestorDemographics: Detailed breakdown of investor profiles, geographic distribution, investment ranges, and accreditation status

Creator-Only Analytics Functions

• get_campaign_analytics(): Returns detailed analytics dashboard data for campaign creators
• get_investor_demographics(): Provides investor demographic analysis and distribution metrics
• get_campaign_performance_comparison(): Benchmarks campaign performance against similar campaigns
• get_funding_timeline(): Supplies historical funding progress data points

Access Control & Privacy

• All analytics functions enforce creator-only access using self.env().caller() validation
• Admin override capability for platform monitoring
• Privacy-preserving design that protects investor anonymity

🔧 Technical Implementation

Data Structures Added

pub struct CampaignAnalytics {
    pub campaign_id: u64,
    pub total_investors: u32,
    pub total_investment: u128,
    pub funding_progress: u32, // in basis points (0-10000)
    pub average_investment: u128,
    pub largest_investment: u128,
    pub milestone_completion_rate: u32,
    pub days_active: u32,
    pub funding_velocity: u128,
    pub investor_retention_rate: u32,
    pub risk_score: u32,
    pub projected_completion_days: u32,
}

pub struct InvestorDemographics {
    pub total_investors: u32,
    pub accredited_investors: u32,
    pub average_investment: u128,
    pub top_investor_amount: u128,
    pub jurisdictions: Vec<(String, u32)>,
    pub investment_distribution: Vec<(u128, u32)>,
}

Analytics Calculations

• Funding Progress: Calculated in basis points for precision
• Performance Comparison: Compares against campaigns with similar target amounts
• Risk Integration: Leverages existing risk assessment system
• Timeline Data: Provides structured historical funding data

Bug Fixes & Missing Components

• Added missing CampaignSummary and CampaignFilter structs
• Implemented share_campaign() function for social media integration
• Added AccreditationVerified event emission
• Fixed enum duplicate variants and trait import issues

🧪 Testing & Validation

Test Coverage Added

• test_campaign_analytics_for_creator(): Validates analytics access and data accuracy
• test_campaign_analytics_access_denied_for_non_creator(): Ensures proper access control
• test_investor_demographics(): Tests demographic data generation
• test_share_campaign(): Validates social sharing functionality

Test Scenarios

• ✅ Creator can access their campaign analytics
• ✅ Non-creators are denied access
• ✅ Analytics calculations are accurate
• ✅ Error handling for invalid campaigns
• ✅ Event emission validation

📊 Analytics Dashboard Capabilities

Campaign creators now receive:

Funding Analytics

• Real-time funding progress tracking
• Investment velocity calculations
• Completion timeline projections
• Milestone progress monitoring

Investor Insights

• Total and accredited investor counts
• Geographic distribution analysis
• Investment amount distributions
• Average investment metrics

Performance Benchmarking

• Percentile ranking against similar campaigns
• Comparative success metrics
• Risk-adjusted performance scoring

Historical Data

• Funding timeline visualization data
• Progress trend analysis
• Milestone completion tracking

🔒 Security & Privacy Considerations

• Access Control: Creator-only analytics access with admin override
• Data Privacy: No individual investor data exposed
• Reentrancy Protection: All functions use existing reentrancy guards
• Input Validation: Comprehensive parameter validation

📁 Files Modified

contracts/crowdfunding/src/lib.rs
├── Added CampaignAnalytics struct
├── Added InvestorDemographics struct
├── Added get_campaign_analytics() function
├── Added get_investor_demographics() function
├── Added get_campaign_performance_comparison() function
├── Added get_funding_timeline() function
├── Added share_campaign() function
├── Added AccreditationVerified event
├── Fixed CampaignSummary and CampaignFilter structs
├── Updated test imports and added test cases
└── Fixed compilation issues

🚀 Integration Impact

• Backward Compatible: No breaking changes to existing APIs
• Performance: Efficient calculations using existing storage mappings
• Scalability: Analytics scale with campaign and investor growth
• Frontend Ready: Structured data formats suitable for dashboard visualization

🎯 Next Steps

This implementation provides the foundation for:

• Frontend analytics dashboard development
• Advanced reporting features
• Predictive analytics integration
• Performance optimization recommendations

✅ Validation Checklist

• Analytics functions compile successfully
• Access control properly enforced
• Test coverage comprehensive
• Data structures properly defined
• Event emissions working
• No breaking changes introduced
• Privacy and security requirements met

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