#!/usr/bin/env bash
# Verify WETH → USDT Bridge Route via thirdweb Bridge
# Checks: bytecode, ERC-20 compliance, thirdweb Bridge route availability
# Usage: ./verify-weth-usdt-bridge.sh

set -euo pipefail

SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
PROJECT_ROOT="$(cd "$SCRIPT_DIR/../.." && pwd)"

# Colors
RED='\033[0;31m'
GREEN='\033[0;32m'
YELLOW='\033[1;33m'
BLUE='\033[0;34m'
CYAN='\033[0;36m'
NC='\033[0m'

log_info() { echo -e "${BLUE}[INFO]${NC} $1"; }
log_success() { echo -e "${GREEN}[✓]${NC} $1"; }
log_error() { echo -e "${RED}[✗]${NC} $1"; }
log_warn() { echo -e "${YELLOW}[⚠]${NC} $1"; }
log_section() { echo -e "\n${CYAN}━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━${NC}"; echo -e "${CYAN}$1${NC}"; echo -e "${CYAN}━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━${NC}\n"; }

# Configuration
CHAIN138_RPC="${RPC_URL_138:-https://rpc-http-pub.d-bis.org}"
CHAIN138_ID=138
ETHEREUM_MAINNET_ID=1

# Token addresses
WETH_ADDRESS="0xC02aaA39b223FE8D0A0e5C4F27eAD9083C756Cc2"
USDT_MAINNET="0xdAC17F958D2ee523a2206206994597C13D831ec7"

# Verification results
BYTECODE_EXISTS=false
ERC20_VALID=false
BRIDGE_ROUTE_AVAILABLE=false
VERIFICATION_ERRORS=()

log_section "WETH → USDT Bridge Verification (ChainID 138 → Ethereum Mainnet)"

# ============================================================================
# STEP 1: Check Bytecode at WETH Address on ChainID 138
# ============================================================================
log_section "Step 1: Checking Bytecode at WETH Address on ChainID 138"

log_info "WETH Address: $WETH_ADDRESS"
log_info "ChainID: $CHAIN138_ID"
log_info "RPC URL: $CHAIN138_RPC"
log_info ""

# Check if cast is available
if ! command -v cast &> /dev/null; then
    log_error "cast (foundry) is not installed. Installing dependencies..."
    log_warn "Please install foundry: curl -L https://foundry.paradigm.xyz | bash"
    VERIFICATION_ERRORS+=("cast tool not available")
else
    # Get bytecode using eth_getCode
    log_info "Querying bytecode using eth_getCode..."
    BYTECODE=$(cast code "$WETH_ADDRESS" --rpc-url "$CHAIN138_RPC" 2>/dev/null || echo "")
    
    if [ -z "$BYTECODE" ] || [ "$BYTECODE" = "0x" ]; then
        log_error "❌ No bytecode found at WETH address on ChainID 138"
        log_error "   Address: $WETH_ADDRESS"
        log_error "   This means the contract is NOT deployed at this address"
        VERIFICATION_ERRORS+=("No bytecode at WETH address on ChainID 138")
    else
        BYTECODE_LENGTH=$((${#BYTECODE} - 2))  # Subtract "0x" prefix
        BYTECODE_BYTES=$((BYTECODE_LENGTH / 2))
        log_success "✅ Bytecode exists at WETH address"
        log_info "   Bytecode length: $BYTECODE_LENGTH chars ($BYTECODE_BYTES bytes)"
        log_info "   First 100 chars: ${BYTECODE:0:100}..."
        BYTECODE_EXISTS=true
    fi
fi

# ============================================================================
# STEP 2: Verify ERC-20 Compliance
# ============================================================================
log_section "Step 2: Verifying ERC-20 Compliance"

if [ "$BYTECODE_EXISTS" = true ]; then
    log_info "Testing ERC-20 functions: symbol(), decimals(), totalSupply()"
    log_info ""
    
    # Check symbol()
    log_info "1. Testing symbol()..."
    SYMBOL_RESULT=$(cast call "$WETH_ADDRESS" "symbol()" --rpc-url "$CHAIN138_RPC" 2>&1 || echo "ERROR")
    if [[ "$SYMBOL_RESULT" == *"ERROR"* ]] || [ -z "$SYMBOL_RESULT" ] || [ "$SYMBOL_RESULT" = "0x" ]; then
        log_error "   ❌ symbol() call failed or returned empty"
        VERIFICATION_ERRORS+=("symbol() function failed")
    else
        SYMBOL_CLEAN=$(echo "$SYMBOL_RESULT" | cast --to-ascii 2>/dev/null | tr -d '\0' || echo "$SYMBOL_RESULT")
        log_success "   ✅ symbol() = $SYMBOL_CLEAN"
    fi
    
    # Check decimals()
    log_info "2. Testing decimals()..."
    DECIMALS_RESULT=$(cast call "$WETH_ADDRESS" "decimals()" --rpc-url "$CHAIN138_RPC" 2>&1 || echo "ERROR")
    if [[ "$DECIMALS_RESULT" == *"ERROR"* ]] || [ -z "$DECIMALS_RESULT" ]; then
        log_error "   ❌ decimals() call failed"
        VERIFICATION_ERRORS+=("decimals() function failed")
    else
        DECIMALS_DEC=$(cast --to-dec "$DECIMALS_RESULT" 2>/dev/null || echo "unknown")
        if [ "$DECIMALS_DEC" = "18" ] || [ "$DECIMALS_DEC" = "0x12" ]; then
            log_success "   ✅ decimals() = $DECIMALS_DEC (expected: 18)"
        else
            log_warn "   ⚠ decimals() = $DECIMALS_DEC (expected: 18)"
            VERIFICATION_ERRORS+=("decimals() returned unexpected value: $DECIMALS_DEC")
        fi
    fi
    
    # Check totalSupply()
    log_info "3. Testing totalSupply()..."
    TOTAL_SUPPLY_RESULT=$(cast call "$WETH_ADDRESS" "totalSupply()" --rpc-url "$CHAIN138_RPC" 2>&1 || echo "ERROR")
    if [[ "$TOTAL_SUPPLY_RESULT" == *"ERROR"* ]] || [ -z "$TOTAL_SUPPLY_RESULT" ]; then
        log_error "   ❌ totalSupply() call failed"
        VERIFICATION_ERRORS+=("totalSupply() function failed")
    else
        TOTAL_SUPPLY_DEC=$(cast --to-dec "$TOTAL_SUPPLY_RESULT" 2>/dev/null || echo "unknown")
        log_success "   ✅ totalSupply() = $TOTAL_SUPPLY_DEC"
    fi
    
    # Determine ERC-20 validity
    ERC20_ERRORS_COUNT=0
    for error in "${VERIFICATION_ERRORS[@]}"; do
        if [[ "$error" == *"symbol()"* ]] || [[ "$error" == *"decimals()"* ]] || [[ "$error" == *"totalSupply()"* ]]; then
            ((ERC20_ERRORS_COUNT++))
        fi
    done
    
    if [ $ERC20_ERRORS_COUNT -eq 0 ]; then
        ERC20_VALID=true
        log_success "✅ Contract behaves as valid ERC-20"
    else
        log_warn "⚠ Some ERC-20 functions failed, but contract may still be partially functional"
    fi
else
    log_warn "⚠ Skipping ERC-20 verification (no bytecode found)"
fi

# ============================================================================
# STEP 3: Check thirdweb Bridge Route
# ============================================================================
log_section "Step 3: Checking thirdweb Bridge Route Availability"

log_info "Checking route: ChainID $CHAIN138_ID (WETH) → ChainID $ETHEREUM_MAINNET_ID (USDT)"
log_info "WETH Address (ChainID 138): $WETH_ADDRESS"
log_info "USDT Address (Ethereum Mainnet): $USDT_MAINNET"
log_info ""

# Note: thirdweb Bridge API endpoint may vary
# Common endpoints:
# - https://api.thirdweb.com/v1/bridge/quote
# - https://bridge.thirdweb.com/api/quote
# - SDK-based: @thirdweb-dev/sdk

log_info "Attempting to query thirdweb Bridge API..."
log_warn "Note: Exact API endpoint may need verification with thirdweb documentation"

# Try multiple potential API endpoints
THIRDWEB_ENDPOINTS=(
    "https://api.thirdweb.com/v1/bridge/quote"
    "https://bridge.thirdweb.com/api/quote"
    "https://api.thirdweb.com/bridge/quote"
)

BRIDGE_QUOTE_SUCCESS=false
BRIDGE_ERROR_MESSAGE=""

for endpoint in "${THIRDWEB_ENDPOINTS[@]}"; do
    log_info "Trying endpoint: $endpoint"
    
    # Construct request payload
    # Note: Exact API format may vary - this is a best-guess structure
    QUOTE_PAYLOAD=$(cat <<EOF
{
    "fromChainId": $CHAIN138_ID,
    "toChainId": $ETHEREUM_MAINNET_ID,
    "fromTokenAddress": "$WETH_ADDRESS",
    "toTokenAddress": "$USDT_MAINNET",
    "amount": "1000000000000000000"
}
EOF
)
    
    # Try to get quote
    QUOTE_RESPONSE=$(curl -s -X POST "$endpoint" \
        -H "Content-Type: application/json" \
        -d "$QUOTE_PAYLOAD" \
        --max-time 10 \
        2>&1 || echo "ERROR")
    
    if [[ "$QUOTE_RESPONSE" != *"ERROR"* ]] && [[ "$QUOTE_RESPONSE" != *"404"* ]] && [[ "$QUOTE_RESPONSE" != *"Not Found"* ]]; then
        # Check if response contains valid quote data
        if command -v jq &> /dev/null && echo "$QUOTE_RESPONSE" | jq -e '.quoteId, .estimatedTime, .fee, .toAmount' >/dev/null 2>&1; then
            log_success "✅ Valid route found via thirdweb Bridge!"
            log_info "   Response: $(echo "$QUOTE_RESPONSE" | jq -c '.' 2>/dev/null || echo "$QUOTE_RESPONSE")"
            BRIDGE_ROUTE_AVAILABLE=true
            BRIDGE_QUOTE_SUCCESS=true
            break
        elif command -v jq &> /dev/null && echo "$QUOTE_RESPONSE" | jq -e '.error, .message' >/dev/null 2>&1; then
            ERROR_MSG=$(echo "$QUOTE_RESPONSE" | jq -r '.error // .message // "Unknown error"' 2>/dev/null || echo "API error")
            log_warn "   API returned error: $ERROR_MSG"
            BRIDGE_ERROR_MESSAGE="$ERROR_MSG"
        fi
    fi
done

if [ "$BRIDGE_QUOTE_SUCCESS" = false ]; then
    log_warn "⚠ Could not verify route via thirdweb Bridge API"
    log_info "   Possible reasons:"
    log_info "   1. ChainID 138 not supported by thirdweb Bridge"
    log_info "   2. WETH token not recognized on ChainID 138"
    log_info "   3. No liquidity available for WETH → USDT route"
    log_info "   4. API endpoint format differs from expected"
    log_info "   5. Requires authentication/API key"
    log_info ""
    log_info "   Recommendation: Check thirdweb Bridge documentation or SDK"
    log_info "   SDK Usage: Use @thirdweb-dev/sdk Bridge.getQuote() method"
    VERIFICATION_ERRORS+=("thirdweb Bridge route verification inconclusive")
fi

# ============================================================================
# STEP 4: Alternative Routes Analysis
# ============================================================================
log_section "Step 4: Alternative Routes Analysis"

if [ "$BRIDGE_ROUTE_AVAILABLE" = false ]; then
    log_info "Since direct route may not be available, here are alternative options:"
    log_info ""
    
    log_info "Option 1: Swap to Native Asset (ETH) → Bridge → Swap to USDT"
    log_info "   - Swap WETH → ETH on ChainID 138 (if supported)"
    log_info "   - Bridge ETH to Ethereum Mainnet"
    log_info "   - Swap ETH → USDT on Ethereum Mainnet"
    log_info "   Pros: Native asset bridging often has better support"
    log_info "   Cons: Multiple steps, additional fees"
    log_info ""
    
    log_info "Option 2: Bridge via Intermediate L2"
    log_info "   - Bridge WETH from ChainID 138 → Arbitrum/Optimism/Base"
    log_info "   - Swap WETH → USDT on L2"
    log_info "   - Bridge USDT from L2 → Ethereum Mainnet"
    log_info "   Pros: Lower fees on L2, better liquidity"
    log_info "   Cons: More complex route, longer time"
    log_info ""
    
    log_info "Option 3: Use CCIP Bridge (if available)"
    log_info "   - Use Chainlink CCIP for direct WETH bridging"
    log_info "   - Swap WETH → USDT on destination chain"
    log_info "   Pros: Secure, audited bridge"
    log_info "   Cons: Requires CCIP support for ChainID 138"
    log_info ""
    
    log_info "Option 4: Request Token Support"
    log_info "   - Contact thirdweb to request ChainID 138 support"
    log_info "   - Request WETH token recognition"
    log_info "   Pros: Enables direct route in future"
    log_info "   Cons: May take time for implementation"
fi

# ============================================================================
# FINAL VERDICT: GO / NO-GO
# ============================================================================
log_section "Final Verdict: GO / NO-GO"

log_info "Verification Summary:"
log_info "━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━"
log_info ""

# Bytecode check
if [ "$BYTECODE_EXISTS" = true ]; then
    log_success "✓ Bytecode exists at WETH address on ChainID 138"
else
    log_error "✗ No bytecode at WETH address on ChainID 138"
fi

# ERC-20 check
if [ "$ERC20_VALID" = true ]; then
    log_success "✓ Contract behaves as valid ERC-20"
else
    log_warn "⚠ ERC-20 verification incomplete or failed"
fi

# Bridge route check
if [ "$BRIDGE_ROUTE_AVAILABLE" = true ]; then
    log_success "✓ Valid route available via thirdweb Bridge"
else
    log_warn "⚠ Route availability inconclusive or not available"
fi

log_info ""
log_info "━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━"
log_info ""

# Determine GO/NO-GO
if [ "$BYTECODE_EXISTS" = true ] && [ "$ERC20_VALID" = true ] && [ "$BRIDGE_ROUTE_AVAILABLE" = true ]; then
    log_success "━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━"
    log_success "✅ GO: Bridge route is viable"
    log_success "━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━"
    log_info ""
    log_info "All checks passed:"
    log_info "  • WETH contract exists and is valid on ChainID 138"
    log_info "  • Contract implements ERC-20 correctly"
    log_info "  • thirdweb Bridge provides valid route to USDT on Ethereum Mainnet"
    log_info ""
    log_info "You can proceed with bridging WETH → USDT via thirdweb Bridge."
    exit 0
elif [ "$BYTECODE_EXISTS" = true ] && [ "$ERC20_VALID" = true ] && [ "$BRIDGE_ROUTE_AVAILABLE" = false ]; then
    log_warn "━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━"
    log_warn "⚠ CONDITIONAL GO: Contract valid but route unverified"
    log_warn "━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━"
    log_info ""
    log_info "Contract verification passed, but bridge route needs manual verification:"
    log_info "  • WETH contract exists and is valid on ChainID 138 ✓"
    log_info "  • Contract implements ERC-20 correctly ✓"
    log_info "  • thirdweb Bridge route verification inconclusive ⚠"
    log_info ""
    log_info "Next steps:"
    log_info "  1. Verify route using thirdweb SDK: Bridge.getQuote()"
    log_info "  2. Check thirdweb Bridge dashboard for ChainID 138 support"
    log_info "  3. Consider alternative routes if direct route unavailable"
    exit 1
else
    log_error "━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━"
    log_error "❌ NO-GO: Bridge route is NOT viable"
    log_error "━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━"
    log_info ""
    log_error "Critical issues found:"
    for error in "${VERIFICATION_ERRORS[@]}"; do
        log_error "  • $error"
    done
    log_info ""
    log_info "Recommendation: Fix contract deployment or use alternative bridging method"
    exit 2
fi