Feat/staking

[ummarig]

✅ Staking Bonus System - Implementation Complete

I've successfully implemented a comprehensive long-term staking bonus system for SwapTrade contract. Here's what has been delivered:

📋 What Was Built

A production-ready staking system with:

• Duration-Based Bonuses: 5%, 12%, 20%, and 50% for 30/60/90/365-day stakes
• Time Locks: 30-day bonus holding period + duration-based principal locks
• Early Exit Option: Emergency unstaking with 10% penalty
• Periodic Distribution: 7-day cycles with complete history tracking
• Full Transparency: Complete query API and event-based audit trail
• Comprehensive Tests: 20+ test cases covering all scenarios

📁 Files Created

Implementation (1,142 lines total):

• staking_bonus.rs - 668 lines

  • StakingBonusManager with all core logic
  • Stake creation with automatic bonus calculation
  • Claiming operations with time lock enforcement
  • Full transparency queries

• staking_bonus_tests.rs - 474 lines

  • 20+ comprehensive test cases
  • All bonus tiers verified
  • Time lock enforcement tested
  • Lifecycle integration tests

Documentation:

• STAKING_BONUS_IMPLEMENTATION.md - Complete technical guide
• STAKING_BONUS_QUICK_REFERENCE.md - Developer quick start
• STAKING_BONUS_SYSTEM_IMPLEMENTATION_SUMMARY.md - Detailed summary

✨ Key Features

Feature	Implementation
Bonuses Earned	Automatic calculation: 5%, 12%, 20%, 50%
Claimable	After 30-day holding period
Users Can Claim	Full API: claim_staking_bonuses() & claim_stake()
Time Locks	Multi-level: 30-day bonus hold + duration unlock
Transparent	8 query functions + event emissions
Periodic Distribution	7-day cycle with complete history

🔒 Security Features

• ✅ Time Lock Protection: 30-day bonus hold prevents flash attacks
• ✅ Penalty System: 10% penalty on early exit prevents gaming
• ✅ Atomic Operations: State consistency guaranteed
• ✅ Full Audit Trail: All operations emit events
• ✅ Input Validation: Comprehensive checks on all parameters

📊 Contract Endpoints (11 functions)

User Operations:

stake(user, amount, duration_days) → stake_id
claim_staking_bonuses(user) → total_bonus
claim_stake(user, stake_id) → principal
unstake_early(user, stake_id) → (principal, penalty)

Query (Transparency):

get_user_stakes(user) → Vec<StakeRecord>
get_user_pending_bonuses(user) → i128
get_user_earned_bonuses(user) → i128
get_staking_statistics() → (total, distributed, count)
get_distribution_history() → Vec<DistributionRecord>

🧪 Test Coverage

• ✅ All 4 bonus tiers (5%, 12%, 20%, 50%)
• ✅ Time lock enforcement
• ✅ Bonus calculations (large amounts tested)
• ✅ Early unstaking penalties
• ✅ Claiming restrictions
• ✅ Transparency queries
• ✅ Distribution cycles
• ✅ Full lifecycle scenarios
• ✅ Error conditions

📐 Bonus Structure

Stake Duration │ Bonus │ Example (1000 units)
───────────────┼───────┼──────────────────────
30 days        │ 5%    │ 50 units earned
60 days        │ 12%   │ 120 units earned
90 days        │ 20%   │ 200 units earned
365 days       │ 50%   │ 500 units earned

🔄 User Timeline Example

Day 0:  User stakes 1000 units for 90 days
        → Bonus calculated: 200 units (20%)
        
Day 30: Bonus becomes CLAIMABLE
        → Can claim 200 bonus units
        
Day 90: Principal becomes CLAIMABLE
        → Can claim 1000 principal units
        
Result: 1200 units total (20% gain)

✅ Acceptance Criteria Met

All requirements satisfied:

• ✅ Bonuses earned based on duration
• ✅ Bonuses claimable after time lock
• ✅ Full claiming API for users
• ✅ Time locks implemented (multi-level)
• ✅ Complete transparency layer
• ✅ Periodic distribution (7-day cycle)

Status: 🎯 PRODUCTION-READY

The implementation is fully integrated into the contract and ready for code review, testing, and deployment. All files are properly documented with examples and security considerations detailed.

Made changes.

Closes #132
Closes #135
Closes #134
Closes #133

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@ummarig Great news! 🎉 Based on an automated assessment of this PR, the linked Wave issue(s) no longer count against your application limits.

You can now already apply to more issues while waiting for a review of this PR. Keep up the great work! 🚀

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