feat: Implement Cross-Contract Aggregation and Reporting

[Georgechisom]

Overview

Implements Cross-Contract Aggregation and Reporting system for RemitWise.

Changes Made

New Contract: reporting/

• 700+ lines of production-ready Rust code
• 15 comprehensive tests - all passing ✅
• 41KB WASM binary ready for deployment
• Full cross-contract integration with all existing contracts

Features Implemented

1. Cross-Contract Data Aggregation

• ✅ Queries data from remittance_split, savings_goals, bill_payments, insurance, and family_wallet
• ✅ Type-safe client traits for cross-contract calls
• ✅ Efficient data aggregation algorithms

2. Six Report Types

• Remittance Summary: Category breakdowns with percentages
• Savings Progress: Goal completion tracking and progress
• Bill Payment Compliance: Payment status and overdue tracking
• Insurance Coverage: Policy analysis and premium calculations
• Financial Health: Comprehensive overview with health score
• Trend Analysis: Period-over-period comparison

3. Financial Health Score (0-100)

• Savings: 40 points (based on goal progress)
• Bills: 40 points (based on payment compliance)
• Insurance: 20 points (based on coverage status)

4. Report Storage & Retrieval

• On-chain report storage with period keys
• User-specific report isolation
• Efficient TTL-managed storage

Files Added

• reporting/Cargo.toml - Package configuration
• reporting/src/lib.rs - Main contract implementation
• reporting/src/tests.rs - Comprehensive test suite
• reporting/README.md - Detailed documentation
• REPORTING_IMPLEMENTATION.md - Implementation summary

Files Modified

• Cargo.toml - Added reporting to workspace
• README.md - Added reporting contract section
• ARCHITECTURE.md - Updated architecture diagrams
• DEPLOYMENT.md - Added deployment instructions

Testing

### Test Results
running 15 tests test 
tests::test_calculate_health_score ... ok
tests::test_configure_addresses ... ok 
tests::test_configure_addresses_unauthorized ... ok 
test tests::test_get_bill_compliance_report ... ok 
tests::test_get_financial_health_report ... ok 
test tests::test_get_insurance_report ... ok 
test tests::test_get_remittance_summary ... ok 
test tests::test_get_savings_report ... ok 
tests::test_get_trend_analysis ... ok 
tests::test_get_trend_analysis_decrease ... ok 
tests::test_health_score_no_goals ... ok 
tests::test_init_reporting_contract ... ok 
tests::test_init_twice_fails ... ok 
tests::test_retrieve_nonexistent_report ... ok 
tests::test_store_and_retrieve_report ... ok

test result: ok. 15 passed; 0 failed; 0 ignored

Build Status

• ✅ All contracts compile successfully
• ✅ WASM files generated for all contracts
• ✅ All workspace tests passing (74 total tests)
• ✅ No compilation errors or warnings

Acceptance Criteria

All acceptance criteria from issue #48 have been met:

• ✅ Reporting contract created
• ✅ Cross-contract aggregation working
• ✅ Multiple report types generated
• ✅ Trend analysis implemented
• ✅ Report storage working
• ✅ Report retrieval functions
• ✅ Tests for reporting scenarios
• ✅ Documentation updated

Technical Highlights

1. Efficient Cross-Contract Calls: Used Soroban's #[contractclient] macro for type-safe communication
2. Storage Optimization: Implemented efficient storage patterns with TTL management
3. Comprehensive Testing: 15 tests with mock contracts for isolated testing
4. Clean Architecture: No circular dependencies, clear separation of concerns
5. Production Ready: Proper error handling, authorization, and event emissions

Deployment

The reporting contract should be deployed after all core contracts:

1. Deploy core contracts (remittance_split, savings_goals, bill_payments, insurance, family_wallet)
2. Deploy reporting contract
3. Initialize with admin address
4. Configure contract addresses

See DEPLOYMENT.md for detailed instructions.

Breaking Changes

None - This is a new contract addition with no changes to existing contract interfaces.

Documentation

• ✅ Comprehensive README for reporting contract
• ✅ Updated main README
• ✅ Updated ARCHITECTURE.md
• ✅ Updated DEPLOYMENT.md
• ✅ Implementation summary document

Checklist

• Code compiles without errors
• All tests pass
• Documentation updated
• No breaking changes
• Contract builds to WASM successfully
• Cross-contract integration tested
• Security considerations addressed
• Event emissions implemented
• Storage TTL management implemented

Closes #48

[Baskarayelu]

@Georgechisom Please resolve the conflicts

[Georgechisom]

conflict resolved. Thank you

[Georgechisom]

pls help assign other issues to me when you add then to the stellar wave (Implement Comprehensive Error Handling and Recovery)

[Baskarayelu]

@Georgechisom please fix the pipeline

[Georgechisom]

errors fix, kindly merge