#!/usr/bin/env node
/**
 * WETH → USDT Bridge Verification using thirdweb SDK
 * Verifies bytecode, ERC-20 compliance, and bridge route availability
 */

const { ThirdwebSDK } = require("@thirdweb-dev/sdk");
const { ethers } = require("ethers");

// Configuration
const CHAIN138_RPC = process.env.RPC_URL_138 || "https://rpc-http-pub.d-bis.org";
const CHAIN138_ID = 138;
const ETHEREUM_MAINNET_ID = 1;

// Token addresses
const WETH_CANONICAL = "0xC02aaA39b223FE8D0A0e5C4F27eAD9083C756Cc2";
const WETH_CHAIN138 = "0x3304b747E565a97ec8AC220b0B6A1f6ffDB837e6"; // Actual deployed address
const USDT_MAINNET = "0xdAC17F958D2ee523a2206206994597C13D831ec7";

// ERC-20 ABI (minimal for verification)
const ERC20_ABI = [
    "function symbol() view returns (string)",
    "function decimals() view returns (uint8)",
    "function totalSupply() view returns (uint256)"
];

// Colors for console output
const colors = {
    reset: '\x1b[0m',
    bright: '\x1b[1m',
    red: '\x1b[31m',
    green: '\x1b[32m',
    yellow: '\x1b[33m',
    blue: '\x1b[34m',
    cyan: '\x1b[36m'
};

function log(message, color = 'reset') {
    console.log(`${colors[color]}${message}${colors.reset}`);
}

function logSection(title) {
    console.log(`\n${colors.cyan}━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━${colors.reset}`);
    console.log(`${colors.cyan}${title}${colors.reset}`);
    console.log(`${colors.cyan}━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━${colors.reset}\n`);
}

async function checkBytecode(provider, address, label) {
    log(`Checking bytecode at ${label}: ${address}`, 'blue');
    try {
        const code = await provider.getCode(address);
        if (code === "0x" || code === "0x0") {
            log(`  ❌ No bytecode found`, 'red');
            return false;
        } else {
            const codeLength = (code.length - 2) / 2; // Subtract "0x" and convert hex to bytes
            log(`  ✅ Bytecode exists (${codeLength} bytes)`, 'green');
            return true;
        }
    } catch (error) {
        log(`  ❌ Error checking bytecode: ${error.message}`, 'red');
        return false;
    }
}

async function verifyERC20(provider, address) {
    log(`Verifying ERC-20 compliance at: ${address}`, 'blue');
    const contract = new ethers.Contract(address, ERC20_ABI, provider);
    
    const results = {
        symbol: null,
        decimals: null,
        totalSupply: null,
        valid: false
    };
    
    try {
        // Check symbol()
        try {
            results.symbol = await contract.symbol();
            log(`  ✅ symbol() = ${results.symbol}`, 'green');
        } catch (error) {
            log(`  ❌ symbol() failed: ${error.message}`, 'red');
        }
        
        // Check decimals()
        try {
            results.decimals = await contract.decimals();
            const expected = 18;
            if (results.decimals === expected) {
                log(`  ✅ decimals() = ${results.decimals} (expected: ${expected})`, 'green');
            } else {
                log(`  ⚠ decimals() = ${results.decimals} (expected: ${expected})`, 'yellow');
            }
        } catch (error) {
            log(`  ❌ decimals() failed: ${error.message}`, 'red');
        }
        
        // Check totalSupply()
        try {
            results.totalSupply = await contract.totalSupply();
            const formatted = ethers.formatEther(results.totalSupply);
            log(`  ✅ totalSupply() = ${formatted} WETH`, 'green');
        } catch (error) {
            log(`  ❌ totalSupply() failed: ${error.message}`, 'red');
        }
        
        // Determine validity
        if (results.symbol && results.decimals !== null && results.totalSupply !== null) {
            results.valid = true;
            log(`  ✅ Contract behaves as valid ERC-20`, 'green');
        } else {
            log(`  ⚠ Some ERC-20 functions failed`, 'yellow');
        }
    } catch (error) {
        log(`  ❌ ERC-20 verification error: ${error.message}`, 'red');
    }
    
    return results;
}

async function checkThirdwebBridgeRoute(fromChainId, toChainId, fromToken, toToken) {
    logSection("Step 3: Checking thirdweb Bridge Route");
    
    log(`Checking route: ChainID ${fromChainId} (WETH) → ChainID ${toChainId} (USDT)`, 'blue');
    log(`WETH Address: ${fromToken}`, 'blue');
    log(`USDT Address: ${toToken}`, 'blue');
    log(``, 'blue');
    
    try {
        // Initialize thirdweb SDK
        log(`Initializing thirdweb SDK...`, 'blue');
        const sdk = new ThirdwebSDK(new ethers.JsonRpcProvider(CHAIN138_RPC), {
            chainId: fromChainId
        });
        
        // Try to get bridge quote
        // Note: thirdweb Bridge API may not be directly accessible via SDK
        // This is a placeholder - actual implementation may vary
        log(`Attempting to get bridge quote...`, 'blue');
        log(`⚠ Note: thirdweb Bridge may require specific setup or may not support ChainID 138`, 'yellow');
        
        // For now, we'll indicate that manual verification is needed
        log(`⚠ Bridge route verification requires manual testing with thirdweb Bridge UI or API`, 'yellow');
        log(`  Recommendation: Use thirdweb Bridge dashboard or contact thirdweb support`, 'blue');
        
        return {
            available: false,
            reason: "Manual verification required - thirdweb Bridge API access needed"
        };
    } catch (error) {
        log(`❌ Error checking bridge route: ${error.message}`, 'red');
        return {
            available: false,
            reason: error.message
        };
    }
}

async function main() {
    logSection("WETH → USDT Bridge Verification (ChainID 138 → Ethereum Mainnet)");
    
    log(`IMPORTANT: WETH9 is NOT at canonical address on ChainID 138`, 'yellow');
    log(`Canonical address (mainnet): ${WETH_CANONICAL}`, 'blue');
    log(`Actual deployed address (ChainID 138): ${WETH_CHAIN138}`, 'blue');
    log(`Reason: Cannot recreate CREATE-deployed contracts with CREATE2`, 'blue');
    log(``, 'blue');
    
    // Initialize provider
    const provider = new ethers.JsonRpcProvider(CHAIN138_RPC);
    
    // Step 1: Check bytecode
    logSection("Step 1: Checking Bytecode");
    
    const canonicalHasBytecode = await checkBytecode(provider, WETH_CANONICAL, "Canonical Address");
    log(``, 'blue');
    const actualHasBytecode = await checkBytecode(provider, WETH_CHAIN138, "Actual Deployed Address");
    
    if (!canonicalHasBytecode) {
        log(`⚠ No bytecode at canonical address (expected - cannot recreate CREATE-deployed contracts)`, 'yellow');
    }
    
    // Step 2: Verify ERC-20
    logSection("Step 2: Verifying ERC-20 Compliance");
    
    let erc20Valid = false;
    if (actualHasBytecode) {
        const erc20Results = await verifyERC20(provider, WETH_CHAIN138);
        erc20Valid = erc20Results.valid;
    } else {
        log(`⚠ Skipping ERC-20 verification (no bytecode found)`, 'yellow');
    }
    
    // Step 3: Check bridge route
    const bridgeRoute = await checkThirdwebBridgeRoute(
        CHAIN138_ID,
        ETHEREUM_MAINNET_ID,
        WETH_CHAIN138,
        USDT_MAINNET
    );
    
    // Final verdict
    logSection("Final Verdict: GO / NO-GO");
    
    log(`Verification Summary:`, 'blue');
    log(`━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━`, 'blue');
    log(``, 'blue');
    
    if (actualHasBytecode) {
        log(`✓ Bytecode exists at actual WETH address on ChainID 138`, 'green');
        log(`  Address: ${WETH_CHAIN138}`, 'blue');
    } else {
        log(`✗ No bytecode at actual WETH address on ChainID 138`, 'red');
    }
    
    if (erc20Valid) {
        log(`✓ Contract behaves as valid ERC-20`, 'green');
    } else {
        log(`⚠ ERC-20 verification incomplete or failed`, 'yellow');
    }
    
    if (bridgeRoute.available) {
        log(`✓ Valid route available via thirdweb Bridge`, 'green');
    } else {
        log(`⚠ Route availability inconclusive: ${bridgeRoute.reason}`, 'yellow');
    }
    
    log(``, 'blue');
    log(`━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━`, 'blue');
    log(``, 'blue');
    
    // Determine GO/NO-GO
    if (actualHasBytecode && erc20Valid && bridgeRoute.available) {
        log(`━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━`, 'green');
        log(`✅ GO: Bridge route is viable`, 'green');
        log(`━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━`, 'green');
        process.exit(0);
    } else if (actualHasBytecode && erc20Valid) {
        log(`━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━`, 'yellow');
        log(`⚠ CONDITIONAL GO: Contract valid but route unverified`, 'yellow');
        log(`━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━`, 'yellow');
        log(``, 'blue');
        log(`Contract verification passed, but bridge route needs manual verification.`, 'blue');
        log(`CRITICAL: WETH is NOT at canonical address on ChainID 138`, 'yellow');
        log(`  • Canonical: ${WETH_CANONICAL} (no bytecode)`, 'blue');
        log(`  • Actual: ${WETH_CHAIN138} (has bytecode)`, 'blue');
        log(``, 'blue');
        log(`Recommendation: Use CCIP Bridge instead (supports ChainID 138)`, 'blue');
        log(`  CCIPWETH9Bridge: 0x89dd12025bfCD38A168455A44B400e913ED33BE2`, 'blue');
        process.exit(1);
    } else {
        log(`━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━`, 'red');
        log(`❌ NO-GO: Bridge route is NOT viable`, 'red');
        log(`━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━`, 'red');
        log(``, 'blue');
        log(`Recommendation: Use CCIP Bridge or fix contract deployment issues`, 'blue');
        process.exit(2);
    }
}

// Run verification
main().catch(error => {
    log(`Fatal error: ${error.message}`, 'red');
    console.error(error);
    process.exit(1);
});