Step-by-Step Stablecoin Penetration Testing: Manual Security Assessment

// exploit-patterns.ts
interface ExploitPattern {
  name: string;
  frequency: number;
  averageLoss: number;
  detectionDifficulty: 'low' | 'medium' | 'high' | 'critical';
  description: string;
}

const historicalExploits: ExploitPattern[] = [
  {
    name: "Oracle Manipulation",
    frequency: 23,
    averageLoss: 15000000,
    detectionDifficulty: 'medium',
    description: "Manipulating price feeds to trigger incorrect minting/burning"
  },
  {
    name: "Reentrancy in Liquidation",
    frequency: 18,
    averageLoss: 8500000,
    detectionDifficulty: 'low',
    description: "Exploiting reentrancy during liquidation processes"
  },
  {
    name: "Cross-Chain Bridge Exploits",
    frequency: 12,
    averageLoss: 45000000,
    detectionDifficulty: 'high',
    description: "Exploiting cross-chain message verification"
  },
  {
    name: "Economic Death Spiral",
    frequency: 8,
    averageLoss: 120000000,
    detectionDifficulty: 'critical',
    description: "Triggering systematic failure through economic manipulation"
  },
  {
    name: "Access Control Bypass",
    frequency: 15,
    averageLoss: 25000000,
    detectionDifficulty: 'medium',
    description: "Bypassing admin controls through privilege escalation"
  }
];

// hardhat.config.ts
import { HardhatUserConfig } from "hardhat/config";
import "@nomicfoundation/hardhat-toolbox";
import "./tasks/stablecoin-test-suite";

const config: HardhatUserConfig = {
  solidity: {
    version: "0.8.20",
    settings: {
      optimizer: {
        enabled: true,
        runs: 200,
      },
      viaIR: true, // Enable for complex contracts
    },
  },
  networks: {
    localhost: {
      url: "http://127.0.0.1:8545",
      chainId: 31337,
      accounts: {
        mnemonic: "test test test test test test test test test test test junk",
        count: 20, // More accounts for complex scenarios
      }
    },
    mainnetFork: {
      url: `https://eth-mainnet.alchemyapi.io/v2/${process.env.ALCHEMY_KEY}`,
      forking: {
        url: `https://eth-mainnet.alchemyapi.io/v2/${process.env.ALCHEMY_KEY}`,
        blockNumber: 18500000 // Pin to specific block for reproducible tests
      },
      accounts: [process.env.PRIVATE_KEY!]
    }
  },
  mocha: {
    timeout: 300000, // 5 minutes for complex integration tests
  }
};

export default config;

// test-framework/StablecoinTester.ts
export class StablecoinTester {
  private contracts: StablecoinContracts;
  private accounts: SignerWithAddress[];
  private snapshots: Map<string, string> = new Map();

  constructor(contracts: StablecoinContracts, accounts: SignerWithAddress[]) {
    this.contracts = contracts;
    this.accounts = accounts;
  }

  // Create controlled market conditions
  async simulateMarketConditions(scenario: MarketScenario): Promise<void> {
    switch (scenario) {
      case 'high_volatility':
        await this.simulateHighVolatility();
        break;
      case 'liquidity_crisis':
        await this.simulateLiquidityCrisis();
        break;
      case 'oracle_failure':
        await this.simulateOracleFailure();
        break;
    }
  }

  // Test economic attack vectors
  async testEconomicAttack(attack: EconomicAttack): Promise<AttackResult> {
    const snapshot = await this.createSnapshot();
    
    try {
      const result = await this.executeEconomicAttack(attack);
      return result;
    } catch (error) {
      console.log(`Attack failed: ${error.message}`);
      return { success: false, profit: 0, damage: 0 };
    } finally {
      await this.restoreSnapshot(snapshot);
    }
  }

  private async simulateHighVolatility(): Promise<void> {
    // Simulate 10% price swings over 30 minutes
    const priceChanges = [1.0, 1.05, 0.98, 1.08, 0.95, 1.02, 0.97, 1.03];
    
    for (const price of priceChanges) {
      await this.updateOraclePrice(price);
      await this.mineBlocks(50); // ~10 minutes at 12s blocks
    }
  }

  private async simulateLiquidityCrisis(): Promise<void> {
    // Remove 80% of liquidity from major DEX pools
    const liquidityPositions = await this.getLiquidityPositions();
    
    for (const position of liquidityPositions) {
      await this.removeLiquidity(position, 0.8);
    }
  }

  // Execute multi-step attacks
  async executeComplexAttack(steps: AttackStep[]): Promise<AttackResult> {
    const results: StepResult[] = [];
    
    for (const step of steps) {
      const result = await this.executeAttackStep(step);
      results.push(result);
      
      if (!result.success) {
        return { success: false, steps: results };
      }
      
      // Wait for next block if required
      if (step.waitForNextBlock) {
        await this.mineBlocks(1);
      }
    }
    
    return { success: true, steps: results };
  }
}

// Usage example
const tester = new StablecoinTester(contracts, accounts);

// Test oracle manipulation attack
const oracleAttack: EconomicAttack = {
  type: 'oracle_manipulation',
  capital: ethers.utils.parseEther('1000000'), // $1M
  targetDeviation: 0.05, // 5% price deviation
  exploitWindow: 300 // 5 minutes
};

const result = await tester.testEconomicAttack(oracleAttack);

// fork-testing.ts
export class MainnetForkTester {
  private provider: JsonRpcProvider;
  
  constructor() {
    this.provider = new JsonRpcProvider(`https://eth-mainnet.alchemyapi.io/v2/${process.env.ALCHEMY_KEY}`);
  }

  // Impersonate whale accounts for realistic testing
  async impersonateWhale(whaleAddress: string): Promise<Signer> {
    await network.provider.request({
      method: "hardhat_impersonateAccount",
      params: [whaleAddress],
    });

    // Give the whale some ETH for gas
    await network.provider.send("hardhat_setBalance", [
      whaleAddress,
      "0x1000000000000000000", // 1 ETH
    ]);

    return await ethers.getSigner(whaleAddress);
  }

  // Test with real DEX liquidity
  async testWithRealLiquidity(testContract: string): Promise<void> {
    // Use actual Uniswap V3 pools
    const uniswapV3Factory = "0x1F98431c8aD98523631AE4a59f267346ea31F984";
    const wethUsdc = "0x8ad599c3A0ff1De082011EFDDc58f1908eb6e6D8";
    
    // Impersonate large liquidity provider
    const whaleSigner = await this.impersonateWhale("0x47ac0Fb4F2D84898e4D9E7b4DaB3C24507a6D503");
    
    // Execute tests with real market conditions
    const testContract = await ethers.getContractAt("StableCoin", testContract, whaleSigner);
    
    // Test large trades that might not be possible on testnet
    await testContract.mint(ethers.utils.parseEther("10000000")); // $10M mint
  }
}

// static-analysis-suite.ts
export class StaticAnalysisRunner {
  async runComprehensiveAnalysis(contractPath: string): Promise<AnalysisResults> {
    const results: AnalysisResults = {
      slither: await this.runSlither(contractPath),
      mythril: await this.runMythril(contractPath),
      manticore: await this.runManticore(contractPath),
      customChecks: await this.runCustomChecks(contractPath)
    };

    return this.correlateResults(results);
  }

  private async runCustomChecks(contractPath: string): Promise<CustomCheckResults> {
    const sourceCode = await fs.readFile(contractPath, 'utf8');
    
    return {
      // Check for common stablecoin vulnerabilities
      hasReentrancyGuard: this.checkReentrancyProtection(sourceCode),
      hasAccessControl: this.checkAccessControl(sourceCode),
      hasEmergencyPause: this.checkEmergencyMechanisms(sourceCode),
      hasUpgradeProtection: this.checkUpgradeProtection(sourceCode),
      hasOracleValidation: this.checkOracleValidation(sourceCode),
      
      // Economic vulnerability patterns
      checksPegStability: this.checkPegStabilityMechanisms(sourceCode),
      hasLiquidationProtection: this.checkLiquidationSafety(sourceCode),
      validatesMintingLimits: this.checkMintingLimits(sourceCode)
    };
  }

  private checkReentrancyProtection(sourceCode: string): boolean {
    // Look for OpenZeppelin ReentrancyGuard usage
    const hasReentrancyGuard = sourceCode.includes('ReentrancyGuard') ||
                              sourceCode.includes('nonReentrant');
    
    // Check for custom reentrancy protection
    const hasCustomProtection = sourceCode.includes('locked') ||
                               sourceCode.includes('_lock');
    
    return hasReentrancyGuard || hasCustomProtection;
  }

  private checkOracleValidation(sourceCode: string): OracleValidationCheck {
    return {
      hasMultipleOracles: sourceCode.includes('oracle') && 
                          (sourceCode.match(/oracle/g) || []).length > 1,
      hasStalenesssCheck: sourceCode.includes('updatedAt') ||
                         sourceCode.includes('timestamp'),
      hasPriceDeviation: sourceCode.includes('deviation') ||
                        sourceCode.includes('threshold'),
      hasCircuitBreaker: sourceCode.includes('pause') ||
                        sourceCode.includes('emergency')
    };
  }
}

// Example vulnerability pattern I look for
contract VulnerableStablecoin {
    mapping(address => uint256) public balances;
    uint256 public totalSupply;
    
    // VULNERABILITY: No reentrancy protection on mint
    function mint(uint256 amount) external {
        require(hasCollateral(msg.sender, amount), "Insufficient collateral");
        
        // This external call can be exploited
        collateralToken.transferFrom(msg.sender, address(this), amount);
        
        // State updates after external call - reentrancy risk
        balances[msg.sender] += amount;
        totalSupply += amount;
        
        emit Mint(msg.sender, amount);
    }
    
    // VULNERABILITY: Oracle price not validated
    function liquidate(address user) external {
        uint256 price = oracle.getPrice(); // No staleness or deviation check
        
        if (isUndercollateralized(user, price)) {
            // Liquidation logic...
        }
    }
}

// dynamic-testing-suite.ts
export class DynamicTester {
  async testEdgeCases(): Promise<void> {
    await this.testBoundaryConditions();
    await this.testRaceConditions();
    await this.testEconomicEdgeCases();
    await this.testIntegrationFailures();
  }

  private async testBoundaryConditions(): Promise<void> {
    // Test with extreme values
    const tests = [
      { amount: 0, description: "Zero value operations" },
      { amount: ethers.constants.MaxUint256, description: "Maximum uint256" },
      { amount: 1, description: "Minimum non-zero value" },
      { amount: ethers.utils.parseEther("1e18"), description: "Extremely large amount" }
    ];

    for (const test of tests) {
      try {
        await this.contracts.stablecoin.mint(test.amount);
        console.log(`✓ Boundary test passed: ${test.description}`);
      } catch (error) {
        console.log(`⚠ Boundary test failed: ${test.description} - ${error.message}`);
      }
    }
  }

  private async testRaceConditions(): Promise<void> {
    // Test concurrent operations
    const promises = [];
    
    // Multiple users trying to mint simultaneously
    for (let i = 0; i < 10; i++) {
      promises.push(
        this.contracts.stablecoin.connect(this.accounts[i]).mint(
          ethers.utils.parseEther("1000")
        )
      );
    }

    try {
      await Promise.all(promises);
      console.log("✓ Concurrent minting test passed");
    } catch (error) {
      console.log(`⚠ Race condition detected: ${error.message}`);
    }
  }

  private async testEconomicEdgeCases(): Promise<void> {
    // Test economic edge cases that can break peg stability
    
    // 1. Massive redemption during low liquidity
    await this.simulateLowLiquidity();
    await this.attemptMassiveRedemption();
    
    // 2. Oracle price manipulation
    await this.testOracleManipulation();
    
    // 3. Flash loan attacks
    await this.testFlashLoanAttacks();
  }

  private async testFlashLoanAttacks(): Promise<void> {
    // Test with Aave flash loans
    const flashLoanAmount = ethers.utils.parseEther("1000000"); // $1M
    
    const attackContract = await this.deployAttackContract();
    
    try {
      await attackContract.executeFlashLoanAttack(
        this.contracts.stablecoin.address,
        flashLoanAmount
      );
      
      console.log("⚠ Flash loan attack succeeded!");
    } catch (error) {
      console.log("✓ Flash loan attack prevented");
    }
  }
}

// multi-block-attacks.ts
export class MultiBlockAttackSimulator {
  async simulateTimedAttack(): Promise<void> {
    // Setup: Position for attack
    const attacker = this.accounts[0];
    
    // Block 1: Setup positions
    console.log("Block 1: Setting up attack positions...");
    await this.contracts.stablecoin.connect(attacker).mint(
      ethers.utils.parseEther("100000")
    );
    await this.mineBlocks(1);
    
    // Block 2: Oracle manipulation
    console.log("Block 2: Manipulating oracle...");
    await this.manipulateOraclePrice(1.05); // 5% increase
    await this.mineBlocks(1);
    
    // Block 3: Exploit arbitrage window
    console.log("Block 3: Exploiting arbitrage window...");
    const profit = await this.executeArbitrageExploit(attacker);
    await this.mineBlocks(1);
    
    // Block 4: Restore oracle (if possible)
    console.log("Block 4: Attempting to restore oracle...");
    await this.restoreOraclePrice();
    
    console.log(`Attack completed. Profit: ${ethers.utils.formatEther(profit)} ETH`);
  }

  async testReorganizationAttacks(): Promise<void> {
    // Simulate blockchain reorganizations
    const snapshot = await this.createSnapshot();
    
    // Execute attack in original chain
    await this.executeAttack();
    const originalResult = await this.getAttackResult();
    
    // Restore and simulate reorganization
    await this.restoreSnapshot(snapshot);
    await this.simulateReorg(3); // 3-block reorg
    
    // Execute attack in reorganized chain
    await this.executeAttack();
    const reorgResult = await this.getAttackResult();
    
    // Compare results
    if (originalResult !== reorgResult) {
      console.log("⚠ Attack outcome changes with reorganization!");
    }
  }
}

// death-spiral-testing.ts
export class DeathSpiralTester {
  async testDeathSpiralScenarios(): Promise<void> {
    const scenarios = [
      { name: "Large Redemption Cascade", trigger: this.triggerRedemptionCascade },
      { name: "Oracle Manipulation Spiral", trigger: this.triggerOracleSpiral },
      { name: "Liquidity Crisis Spiral", trigger: this.triggerLiquidityCrisis },
      { name: "Cross-Protocol Contagion", trigger: this.triggerContagion }
    ];

    for (const scenario of scenarios) {
      console.log(`\n=== Testing ${scenario.name} ===`);
      
      const snapshot = await this.createSnapshot();
      
      try {
        const result = await scenario.trigger();
        await this.analyzeStabilityMechanisms(result);
        
        if (result.pegBroken) {
          console.log(`⚠ ${scenario.name} can break peg stability!`);
          await this.documentVulnerability(scenario.name, result);
        } else {
          console.log(`✓ ${scenario.name} contained by stability mechanisms`);
        }
      } catch (error) {
        console.log(`Error in ${scenario.name}: ${error.message}`);
      } finally {
        await this.restoreSnapshot(snapshot);
      }
    }
  }

  private async triggerRedemptionCascade(): Promise<AttackResult> {
    // Simulate large coordinated redemptions
    const whales = this.accounts.slice(0, 5);
    const redemptionAmount = ethers.utils.parseEther("10000000"); // $10M each
    
    // Phase 1: Build positions
    for (const whale of whales) {
      await this.contracts.stablecoin.connect(whale).mint(redemptionAmount);
    }
    
    // Phase 2: Coordinate redemptions
    const redemptionPromises = whales.map(whale =>
      this.contracts.stablecoin.connect(whale).redeem(redemptionAmount)
    );
    
    const startPrice = await this.getCurrentPrice();
    await Promise.all(redemptionPromises);
    const endPrice = await this.getCurrentPrice();
    
    const priceImpact = (startPrice - endPrice) / startPrice;
    
    return {
      pegBroken: priceImpact > 0.05, // 5% depeg threshold
      priceImpact,
      liquidityRemaining: await this.getTotalLiquidity(),
      reserveRatio: await this.getReserveRatio()
    };
  }

  private async triggerOracleSpiral(): Promise<AttackResult> {
    const initialPrice = await this.oracle.getPrice();
    
    // Gradually manipulate oracle price downward
    const priceSteps = [0.98, 0.95, 0.92, 0.88, 0.85]; // 15% total manipulation
    
    for (const priceRatio of priceSteps) {
      await this.manipulateOraclePrice(priceRatio);
      await this.mineBlocks(10); // Allow arbitrageurs to react
      
      // Check if protocol mechanisms kick in
      const currentPrice = await this.getCurrentPrice();
      if (currentPrice < initialPrice * 0.9) {
        return {
          pegBroken: true,
          priceImpact: (initialPrice - currentPrice) / initialPrice,
          liquidityRemaining: await this.getTotalLiquidity(),
          reserveRatio: await this.getReserveRatio()
        };
      }
    }
    
    return { pegBroken: false, priceImpact: 0 };
  }

  private async analyzeStabilityMechanisms(result: AttackResult): Promise<void> {
    console.log("=== Stability Mechanism Analysis ===");
    
    // Check if circuit breakers activated
    const isPaused = await this.contracts.stablecoin.paused();
    console.log(`Circuit breaker activated: ${isPaused}`);
    
    // Check arbitrage opportunities
    const arbitrageOpportunities = await this.calculateArbitrageOpportunities();
    console.log(`Arbitrage opportunities: ${arbitrageOpportunities.length}`);
    
    // Check reserve adequacy
    const reserveRatio = await this.getReserveRatio();
    console.log(`Reserve ratio: ${reserveRatio}%`);
    
    // Check governance response capability
    const canGovernanceIntervene = await this.checkGovernanceCapabilities();
    console.log(`Governance intervention possible: ${canGovernanceIntervene}`);
  }
}

// arbitrage-testing.ts
export class ArbitrageManipulationTester {
  async testArbitrageManipulation(): Promise<void> {
    // Test 1: Front-running arbitrageurs
    await this.testFrontRunningAttack();
    
    // Test 2: Liquidity sandwiching
    await this.testLiquiditySandwiching();
    
    // Test 3: MEV extraction from arbitrage
    await this.testMEVExtraction();
  }

  private async testFrontRunningAttack(): Promise<void> {
    console.log("Testing front-running attack on arbitrageurs...");
    
    // Create price discrepancy
    await this.createPriceDiscrepancy(0.02); // 2% discrepancy
    
    // Monitor mempool for arbitrage transactions
    const arbitrageTx = await this.waitForArbitrageTx();
    
    if (arbitrageTx) {
      // Attempt to front-run with higher gas price
      const frontRunResult = await this.attemptFrontRun(arbitrageTx);
      
      if (frontRunResult.success) {
        console.log("⚠ Arbitrageurs can be front-run, destabilizing peg!");
      } else {
        console.log("✓ Front-running protection works");
      }
    }
  }

  private async testLiquiditySandwiching(): Promise<void> {
    console.log("Testing liquidity sandwiching attack...");
    
    // Setup: Large arbitrage opportunity
    await this.createLargeArbitrageOpportunity();
    
    // Attack: Sandwich the arbitrage transaction
    const sandwichResult = await this.executeSandwichAttack();
    
    if (sandwichResult.profitExtracted > 0) {
      console.log(`⚠ Sandwich attack extracted ${ethers.utils.formatEther(sandwichResult.profitExtracted)} ETH from arbitrageurs`);
    }
  }
}

// cross-chain-testing.ts
export class CrossChainTester {
  private sourceChain: Network;
  private targetChain: Network;
  private bridge: BridgeContract;

  async testCrossChainVulnerabilities(): Promise<void> {
    await this.testMessageVerification();
    await this.testDoubleSpending();
    await this.testReplayAttacks();
    await this.testBridgeValidation();
  }

  private async testMessageVerification(): Promise<void> {
    console.log("Testing cross-chain message verification...");
    
    // Test 1: Forge invalid messages
    const forgedMessage = this.createForgedMessage();
    
    try {
      await this.bridge.processMessage(forgedMessage);
      console.log("⚠ Bridge accepts forged messages!");
    } catch (error) {
      console.log("✓ Forged message rejected");
    }
    
    // Test 2: Replay old messages
    const oldMessage = await this.getProcessedMessage();
    
    try {
      await this.bridge.processMessage(oldMessage);
      console.log("⚠ Bridge vulnerable to replay attacks!");
    } catch (error) {
      console.log("✓ Replay protection working");
    }
  }

  private async testDoubleSpending(): Promise<void> {
    console.log("Testing double-spending vulnerabilities...");
    
    const amount = ethers.utils.parseEther("1000000");
    
    // Start bridge transaction on source chain
    const bridgeTx = await this.initiateBridge(amount);
    
    // Before completion, try to spend the same tokens
    try {
      const doublespendTx = await this.attemptDoubleSpend(amount);
      
      if (doublespendTx.success) {
        console.log("⚠ Double-spending possible during bridge process!");
      }
    } catch (error) {
      console.log("✓ Double-spending prevented");
    }
  }

  private async testBridgeValidation(): Promise<void> {
    console.log("Testing bridge validation mechanisms...");
    
    const tests = [
      {
        name: "Excessive Amount",
        amount: ethers.utils.parseEther("1000000000"), // $1B
        shouldFail: true
      },
      {
        name: "Zero Amount",
        amount: 0,
        shouldFail: true
      },
      {
        name: "Invalid Recipient",
        amount: ethers.utils.parseEther("1000"),
        recipient: "0x0000000000000000000000000000000000000000",
        shouldFail: true
      }
    ];

    for (const test of tests) {
      try {
        await this.bridge.bridgeTokens(
          test.amount,
          test.recipient || this.accounts[0].address
        );
        
        if (test.shouldFail) {
          console.log(`⚠ ${test.name}: Validation bypassed!`);
        } else {
          console.log(`✓ ${test.name}: Working as expected`);
        }
      } catch (error) {
        if (!test.shouldFail) {
          console.log(`⚠ ${test.name}: Unexpected failure`);
        } else {
          console.log(`✓ ${test.name}: Properly rejected`);
        }
      }
    }
  }
}

// integration-testing.ts
export class IntegrationTester {
  async testThirdPartyFailures(): Promise<void> {
    await this.testOracleFailures();
    await this.testDEXIntegrationFailures();
    await this.testLendingProtocolFailures();
  }

  private async testOracleFailures(): Promise<void> {
    console.log("Testing oracle failure scenarios...");
    
    // Test various oracle failure modes
    const failureScenarios = [
      { name: "Oracle Returns Zero", price: 0 },
      { name: "Oracle Returns Stale Data", staleness: 86400 }, // 1 day old
      { name: "Oracle Price Manipulation", price: 1.5 }, // 50% deviation
      { name: "Oracle Complete Failure", throws: true }
    ];

    for (const scenario of failureScenarios) {
      console.log(`Testing: ${scenario.name}`);
      
      await this.simulateOracleFailure(scenario);
      
      // Check how protocol handles the failure
      const protocolResponse = await this.checkProtocolResponse();
      
      if (protocolResponse.emergencyMode) {
        console.log("✓ Protocol entered emergency mode");
      } else if (protocolResponse.continuedOperation) {
        console.log("⚠ Protocol continued with bad oracle data!");
      }
    }
  }

  private async testDEXIntegrationFailures(): Promise<void> {
    console.log("Testing DEX integration failures...");
    
    // Simulate DEX liquidity removal
    await this.drainDEXLiquidity();
    
    // Test if protocol can still function
    try {
      await this.contracts.stablecoin.mint(ethers.utils.parseEther("1000"));
      console.log("✓ Protocol functions without DEX liquidity");
    } catch (error) {
      console.log("⚠ Protocol depends critically on DEX liquidity");
    }
    
    // Test high slippage scenarios
    await this.testHighSlippageScenarios();
  }

  private async testLendingProtocolFailures(): Promise<void> {
    console.log("Testing lending protocol integration failures...");
    
    // Test when integrated lending protocol gets exploited
    await this.simulateLendingProtocolExploit();
    
    // Check if stablecoin protocol is affected
    const stability = await this.checkStabilityAfterExploit();
    
    if (stability.contagionSpread) {
      console.log("⚠ Lending protocol exploit affects stablecoin stability!");
    } else {
      console.log("✓ Stablecoin isolated from lending protocol failures");
    }
  }
}

// vulnerability-classification.ts
interface StablecoinVulnerability {
  id: string;
  title: string;
  category: VulnerabilityCategory;
  severity: VulnerabilitySeverity;
  impact: VulnerabilityImpact;
  exploitability: ExploitabilityRating;
  description: string;
  proofOfConcept: string;
  remediation: string;
  timeline: string;
}

enum VulnerabilityCategory {
  SMART_CONTRACT = "Smart Contract",
  ECONOMIC_MECHANISM = "Economic Mechanism", 
  ORACLE_INTEGRATION = "Oracle Integration",
  CROSS_CHAIN = "Cross-Chain",
  ACCESS_CONTROL = "Access Control",
  UPGRADEABILITY = "Upgradeability"
}

enum VulnerabilitySeverity {
  CRITICAL = "Critical",    // Can drain significant funds immediately
  HIGH = "High",           // Can cause substantial loss or disruption
  MEDIUM = "Medium",       // Limited impact or requires complex exploitation
  LOW = "Low",            // Minimal impact or theoretical concern
  INFO = "Informational"   // Best practice improvements
}

class VulnerabilityReporter {
  generateReport(vulnerabilities: StablecoinVulnerability[]): string {
    return `
# Stablecoin Protocol Penetration Test Report

## Executive Summary
Total vulnerabilities found: ${vulnerabilities.length}
- Critical: ${vulnerabilities.filter(v => v.severity === VulnerabilitySeverity.CRITICAL).length}
- High: ${vulnerabilities.filter(v => v.severity === VulnerabilitySeverity.HIGH).length}
- Medium: ${vulnerabilities.filter(v => v.severity === VulnerabilitySeverity.MEDIUM).length}
- Low: ${vulnerabilities.filter(v => v.severity === VulnerabilitySeverity.LOW).length}

## Detailed Findings

${vulnerabilities.map(v => this.formatVulnerability(v)).join('\n\n')}

## Remediation Timeline
${this.generateRemediationTimeline(vulnerabilities)}

## Risk Assessment
${this.generateRiskAssessment(vulnerabilities)}
`;
  }

  private formatVulnerability(vuln: StablecoinVulnerability): string {
    return `
### ${vuln.title} [${vuln.severity}]

**Category:** ${vuln.category}
**Severity:** ${vuln.severity}
**Impact:** ${vuln.impact.description}

**Description:**
${vuln.description}

**Proof of Concept:**
\`\`\`solidity
${vuln.proofOfConcept}
\`\`\`

**Impact Analysis:**
- Potential fund loss: $${vuln.impact.potentialLoss.toLocaleString()}
- Users affected: ${vuln.impact.usersAffected.toLocaleString()}
- Protocol disruption: ${vuln.impact.protocolDisruption}

**Remediation:**
${vuln.remediation}

**Timeline:** ${vuln.timeline}
`;
  }
}

// report-generator.ts
export class AutomatedReportGenerator {
  async generateComprehensiveReport(testResults: TestResults): Promise<Report> {
    const report = {
      executiveSummary: await this.generateExecutiveSummary(testResults),
      technicalFindings: await this.generateTechnicalFindings(testResults),
      riskAssessment: await this.generateRiskAssessment(testResults),
      remediationRoadmap: await this.generateRemediationRoadmap(testResults),
      appendices: await this.generateAppendices(testResults)
    };

    return report;
  }

  private async generateExecutiveSummary(results: TestResults): Promise<string> {
    const criticalCount = results.vulnerabilities.filter(v => v.severity === 'Critical').length;
    const totalRisk = results.vulnerabilities.reduce((sum, v) => sum + v.riskScore, 0);
    
    return `
The penetration test revealed ${results.vulnerabilities.length} security issues across the stablecoin protocol.

**Key Findings:**
- ${criticalCount} critical vulnerabilities requiring immediate attention
- Total risk score: ${totalRisk}/100
- Most critical area: ${results.highestRiskArea}
- Estimated remediation time: ${results.estimatedRemediationTime} weeks

**Immediate Actions Required:**
${results.immediateActions.map(action => `- ${action}`).join('\n')}
`;
  }

  private async generateRemediationRoadmap(results: TestResults): Promise<string> {
    const sortedVulns = results.vulnerabilities.sort((a, b) => 
      this.getPriorityScore(b) - this.getPriorityScore(a)
    );

    return `
## Remediation Roadmap

### Phase 1: Critical Issues (0-2 weeks)
${sortedVulns.filter(v => v.severity === 'Critical').map(v => 
  `- ${v.title}: ${v.estimatedFixTime} days`
).join('\n')}

### Phase 2: High Priority (2-6 weeks)  
${sortedVulns.filter(v => v.severity === 'High').map(v => 
  `- ${v.title}: ${v.estimatedFixTime} days`
).join('\n')}

### Phase 3: Medium Priority (6-12 weeks)
${sortedVulns.filter(v => v.severity === 'Medium').map(v => 
  `- ${v.title}: ${v.estimatedFixTime} days`
).join('\n')}
`;
  }

  private getPriorityScore(vuln: Vulnerability): number {
    const severityWeight = {
      'Critical': 100,
      'High': 75,
      'Medium': 50,
      'Low': 25,
      'Info': 10
    };

    const exploitabilityWeight = {
      'Easy': 1.0,
      'Medium': 0.7,
      'Hard': 0.4
    };

    return severityWeight[vuln.severity] * exploitabilityWeight[vuln.exploitability];
  }
}