#!/usr/bin/env python3
"""
Currency Ledger Validation Script
Ensures ledger integrity and policy compliance
"""

import csv
import yaml
from datetime import datetime
import os

def load_policies():
    """Load policy configuration files"""
    policies = {}
    policy_dir = os.path.join(os.path.dirname(__file__), '..', 'policies')
    
    with open(os.path.join(policy_dir, 'credit-rates.yml'), 'r') as f:
        policies['credit_rates'] = yaml.safe_load(f)
    
    with open(os.path.join(policy_dir, 'karma-rules.yml'), 'r') as f:
        policies['karma_rules'] = yaml.safe_load(f)
        
    with open(os.path.join(policy_dir, 'validation-rules.yml'), 'r') as f:
        policies['validation'] = yaml.safe_load(f)
    
    return policies

def validate_sc_ledger():
    """Validate Smartup Credits ledger"""
    print("🔍 Validating Smartup Credits ledger...")
    
    total_sc = 0
    ledger_file = os.path.join(os.path.dirname(__file__), '..', 'ledger', 'smartup-credits', 'transactions.csv')
    
    try:
        with open(ledger_file, 'r') as f:
            reader = csv.DictReader(f)
            transaction_count = 0
            
            for row in reader:
                if row['type'] == 'SC':
                    total_sc += int(row['amount'])
                    transaction_count += 1
                elif row['type'] == 'REDEEM':
                    total_sc -= int(row['amount'])
                    transaction_count += 1
        
        print(f"✅ Total SC Outstanding: {total_sc}")
        print(f"✅ Transactions Processed: {transaction_count}")
        
    except FileNotFoundError:
        print("❌ SC ledger file not found")
        return False
    except Exception as e:
        print(f"❌ Error validating SC ledger: {e}")
        return False
    
    return True

def validate_treasury():
    """Validate treasury balance and 3x rule"""
    print("🔍 Validating treasury balance...")
    
    treasury_file = os.path.join(os.path.dirname(__file__), '..', 'ledger', 'treasury', 'balance.csv')
    
    try:
        with open(treasury_file, 'r') as f:
            reader = csv.DictReader(f)
            rows = list(reader)
            
            if rows:
                latest = rows[-1]
                eur_balance = float(latest['total_eur_balance'])
                sc_outstanding = int(latest['sc_outstanding'])
                ratio = float(latest['ratio'])
                
                print(f"✅ EUR Treasury: €{eur_balance}")
                print(f"✅ SC Outstanding: {sc_outstanding} SC")
                print(f"✅ Current Ratio: {ratio:.2f}")
                
                # Check 3x rule
                if sc_outstanding <= (eur_balance * 3):
                    print("✅ 3x Rule: COMPLIANT")
                else:
                    print("❌ 3x Rule: VIOLATION - Too much SC outstanding!")
                    return False
            else:
                print("⚠️  Treasury initialized but no transactions yet")
                
    except FileNotFoundError:
        print("❌ Treasury file not found")
        return False
    except Exception as e:
        print(f"❌ Error validating treasury: {e}")
        return False
        
    return True

def main():
    """Main validation function"""
    print("🚀 Smartup Zero Currency Ledger Validation")
    print("=" * 50)
    
    # Load policies
    try:
        policies = load_policies()
        print("✅ Policy files loaded successfully")
    except Exception as e:
        print(f"❌ Error loading policies: {e}")
        return
    
    # Validate ledgers
    sc_valid = validate_sc_ledger()
    treasury_valid = validate_treasury()
    
    print("=" * 50)
    if sc_valid and treasury_valid:
        print("🎉 All validations PASSED - Ledger is healthy!")
    else:
        print("🚨 Validation FAILED - Check errors above")

if __name__ == "__main__":
    main()