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#!/usr/bin/env python3
"""
Smart Contract Security Auditor โ€” GRPO vs Base Comparison
Side-by-side evaluation of oxdev/security-auditor-grpo vs Qwen2.5-Coder-0.5B-Instruct
"""

import re
import time
import gradio as gr
import torch
from transformers import AutoModelForCausalLM, AutoTokenizer, pipeline

# โ”€โ”€ Constants โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€
GRPO_MODEL = "oxdev/security-auditor-grpo"
BASE_MODEL = "Qwen/Qwen2.5-Coder-0.5B-Instruct"

SYSTEM_PROMPT = (
    "You are an expert smart contract security auditor. Analyze the provided Solidity code "
    "for vulnerabilities.\n\nFor each finding, use this format:\n"
    "FINDING | severity | bug_class\n"
    "contract: <name>\nfunction: <name>\nbug_class: <class>\nconfidence: high/medium/low\n\n"
    "### Description\n<detailed explanation>\n\n### Impact\n<what can go wrong>\n\n"
    "### Proof of Concept\n```solidity\n<exploit code>\n```\n\n"
    "### Recommendation\n<how to fix>"
)

# โ”€โ”€ Test Cases โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€
TEST_CASES = {
    "๐Ÿ” Reentrancy (Classic)": {
        "code": """// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

contract VulnerableBank {
    mapping(address => uint256) public balances;

    function deposit() public payable {
        balances[msg.sender] += msg.value;
    }

    function withdraw(uint256 amount) public {
        require(balances[msg.sender] >= amount, "Insufficient balance");
        (bool success, ) = msg.sender.call{value: amount}("");
        require(success, "Transfer failed");
        balances[msg.sender] -= amount;
    }

    function getBalance() public view returns (uint256) {
        return address(this).balance;
    }
}""",
        "expected_vuln": "reentrancy",
        "expected_severity": "high",
        "description": "Classic reentrancy: external call before state update in withdraw()"
    },

    "๐Ÿ”‘ Access Control Missing": {
        "code": """// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

contract TokenVault {
    address public owner;
    mapping(address => uint256) public balances;
    bool public paused;

    constructor() {
        owner = msg.sender;
    }

    function deposit() external payable {
        balances[msg.sender] += msg.value;
    }

    function withdrawAll() external {
        // Missing: only owner should call this
        uint256 balance = address(this).balance;
        (bool success, ) = msg.sender.call{value: balance}("");
        require(success);
    }

    function setPaused(bool _paused) external {
        // Missing: only owner should call this
        paused = _paused;
    }

    function emergencyWithdraw(address token, uint256 amount) external {
        // Missing: only owner should call this
        IERC20(token).transfer(msg.sender, amount);
    }
}

interface IERC20 {
    function transfer(address to, uint256 amount) external returns (bool);
}""",
        "expected_vuln": "access-control",
        "expected_severity": "critical",
        "description": "Missing access control on withdrawAll(), setPaused(), emergencyWithdraw()"
    },

    "๐Ÿ“Š Oracle Manipulation": {
        "code": """// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

interface IUniswapV2Pair {
    function getReserves() external view returns (uint112, uint112, uint32);
}

contract VulnerableLending {
    IUniswapV2Pair public pair;
    mapping(address => uint256) public collateral;
    mapping(address => uint256) public debt;

    constructor(address _pair) {
        pair = IUniswapV2Pair(_pair);
    }

    function getPrice() public view returns (uint256) {
        (uint112 reserve0, uint112 reserve1, ) = pair.getReserves();
        return (uint256(reserve1) * 1e18) / uint256(reserve0);
    }

    function deposit() external payable {
        collateral[msg.sender] += msg.value;
    }

    function borrow(uint256 amount) external {
        uint256 price = getPrice();
        uint256 collateralValue = collateral[msg.sender] * price / 1e18;
        require(collateralValue >= amount * 15 / 10, "Undercollateralized");
        debt[msg.sender] += amount;
    }

    function liquidate(address user) external {
        uint256 price = getPrice();
        uint256 collateralValue = collateral[user] * price / 1e18;
        require(collateralValue < debt[user], "Not liquidatable");
        collateral[user] = 0;
        debt[user] = 0;
    }
}""",
        "expected_vuln": "oracle",
        "expected_severity": "high",
        "description": "Spot price from Uniswap reserves is manipulable via flash loans"
    },

    "โšก Flash Loan Attack Surface": {
        "code": """// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

interface IERC20 {
    function balanceOf(address) external view returns (uint256);
    function transfer(address, uint256) external returns (bool);
    function transferFrom(address, address, uint256) external returns (bool);
}

contract VulnerableGovernance {
    IERC20 public token;
    mapping(uint256 => Proposal) public proposals;
    uint256 public proposalCount;

    struct Proposal {
        address proposer;
        string description;
        uint256 forVotes;
        uint256 againstVotes;
        uint256 endBlock;
        bool executed;
    }

    function propose(string calldata desc) external returns (uint256) {
        require(token.balanceOf(msg.sender) >= 1000e18, "Need 1000 tokens");
        proposalCount++;
        proposals[proposalCount] = Proposal(msg.sender, desc, 0, 0, block.number + 100, false);
        return proposalCount;
    }

    function vote(uint256 proposalId, bool support) external {
        Proposal storage p = proposals[proposalId];
        require(block.number <= p.endBlock, "Voting ended");
        // Bug: uses current balance, not snapshot โ€” flash loan can inflate votes
        uint256 votes = token.balanceOf(msg.sender);
        if (support) p.forVotes += votes;
        else p.againstVotes += votes;
    }

    function execute(uint256 proposalId) external {
        Proposal storage p = proposals[proposalId];
        require(block.number > p.endBlock && !p.executed);
        require(p.forVotes > p.againstVotes, "Not passed");
        p.executed = true;
        // execute proposal...
    }
}""",
        "expected_vuln": "flash-loan",
        "expected_severity": "critical",
        "description": "Governance voting uses live balance instead of snapshots โ€” flash loan can swing votes"
    },

    "๐Ÿ”„ Unchecked Return Value": {
        "code": """// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

interface IERC20 {
    function transfer(address to, uint256 amount) external returns (bool);
    function transferFrom(address from, address to, uint256 amount) external returns (bool);
    function approve(address spender, uint256 amount) external returns (bool);
}

contract TokenDistributor {
    IERC20 public token;
    address public admin;
    mapping(address => uint256) public allocations;

    constructor(address _token) {
        token = IERC20(_token);
        admin = msg.sender;
    }

    function setAllocation(address user, uint256 amount) external {
        require(msg.sender == admin);
        allocations[user] = amount;
    }

    function claim() external {
        uint256 amount = allocations[msg.sender];
        require(amount > 0, "Nothing to claim");
        allocations[msg.sender] = 0;
        // Bug: return value not checked โ€” some tokens return false instead of reverting
        token.transfer(msg.sender, amount);
    }

    function batchTransfer(address[] calldata recipients, uint256[] calldata amounts) external {
        require(msg.sender == admin);
        for (uint256 i = 0; i < recipients.length; i++) {
            // Bug: unchecked return value
            token.transfer(recipients[i], amounts[i]);
        }
    }
}""",
        "expected_vuln": "token",
        "expected_severity": "medium",
        "description": "Unchecked ERC20 transfer return values โ€” silent failure with non-standard tokens"
    },

    "๐Ÿงฎ Rounding / Precision Loss": {
        "code": """// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

contract VulnerableVault {
    uint256 public totalShares;
    uint256 public totalAssets;
    mapping(address => uint256) public shares;

    function deposit(uint256 assets) external {
        uint256 sharesToMint;
        if (totalShares == 0) {
            sharesToMint = assets;
        } else {
            // Bug: division before multiplication causes rounding loss
            sharesToMint = assets / totalAssets * totalShares;
        }
        shares[msg.sender] += sharesToMint;
        totalShares += sharesToMint;
        totalAssets += assets;
    }

    function withdraw(uint256 shareAmount) external {
        require(shares[msg.sender] >= shareAmount);
        // Bug: same precision issue
        uint256 assetsToReturn = shareAmount / totalShares * totalAssets;
        shares[msg.sender] -= shareAmount;
        totalShares -= shareAmount;
        totalAssets -= assetsToReturn;
        // transfer assets...
    }

    function previewDeposit(uint256 assets) external view returns (uint256) {
        if (totalShares == 0) return assets;
        return assets / totalAssets * totalShares;
    }
}""",
        "expected_vuln": "rounding",
        "expected_severity": "high",
        "description": "Division before multiplication causes severe precision loss in share calculations"
    },

    "โœ… Clean Contract (No Bugs)": {
        "code": """// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

import "@openzeppelin/contracts/security/ReentrancyGuard.sol";
import "@openzeppelin/contracts/access/Ownable.sol";

contract SecureBank is ReentrancyGuard, Ownable {
    mapping(address => uint256) private _balances;

    event Deposited(address indexed user, uint256 amount);
    event Withdrawn(address indexed user, uint256 amount);

    constructor() Ownable(msg.sender) {}

    function deposit() external payable {
        require(msg.value > 0, "Must deposit > 0");
        _balances[msg.sender] += msg.value;
        emit Deposited(msg.sender, msg.value);
    }

    function withdraw(uint256 amount) external nonReentrant {
        require(_balances[msg.sender] >= amount, "Insufficient balance");
        _balances[msg.sender] -= amount;
        (bool success, ) = msg.sender.call{value: amount}("");
        require(success, "Transfer failed");
        emit Withdrawn(msg.sender, amount);
    }

    function balanceOf(address user) external view returns (uint256) {
        return _balances[user];
    }
}""",
        "expected_vuln": "none",
        "expected_severity": "none",
        "description": "Well-written contract with ReentrancyGuard, Ownable, CEI pattern, events"
    }
}


# โ”€โ”€ Scoring Engine โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€
def score_audit(text, expected_vuln, expected_severity):
    """Score an audit response on multiple dimensions. Returns dict of scores."""
    text_lower = text.lower()
    scores = {}

    # 1. Structure score (0-1): Does it follow the FINDING format?
    struct_score = 0.0
    if re.search(r'FINDING\s*\|', text):
        struct_score += 0.4
    fields = ['contract:', 'function:', 'bug_class:', 'confidence:']
    field_hits = sum(1 for f in fields if f in text_lower)
    struct_score += 0.1 * field_hits
    section_kws = ['description', 'impact', 'proof', 'recommendation', 'mitigation', 'fix']
    sect_hits = sum(1 for k in section_kws if re.search(rf'(?i)(###?\s*{k}|{k}\s*:)', text))
    struct_score += 0.1 * min(sect_hits, 3)
    scores["Structure"] = min(1.0, struct_score)

    # 2. Vulnerability detection (0-1): Did it find the right bug?
    vuln_keywords = {
        "reentrancy": ["reentrancy", "reentrant", "re-enter", "external call before state"],
        "access-control": ["access control", "unauthorized", "missing modifier", "anyone can call", "no restriction"],
        "oracle": ["oracle", "price manipulation", "spot price", "flash loan.*price", "getReserves"],
        "flash-loan": ["flash loan", "snapshot", "live balance", "current balance", "voting power"],
        "token": ["return value", "unchecked", "non-standard", "fee-on-transfer", "bool return"],
        "rounding": ["rounding", "precision", "division before multiplication", "truncat"],
        "none": [],
    }
    if expected_vuln == "none":
        # For clean contracts, reward saying "no major issues" / penalize false positives
        false_alarm_terms = ["critical", "high severity", "vulnerability found", "exploit"]
        has_false_alarm = any(t in text_lower for t in false_alarm_terms)
        safe_terms = ["no .* vulnerabilit", "well.written", "secure", "good practice", "no major"]
        recognizes_safe = any(re.search(t, text_lower) for t in safe_terms)
        scores["Detection"] = 0.8 if recognizes_safe and not has_false_alarm else 0.3 if recognizes_safe else 0.0
    else:
        kws = vuln_keywords.get(expected_vuln, [])
        hits = sum(1 for kw in kws if re.search(kw, text_lower))
        scores["Detection"] = min(1.0, hits * 0.35)

    # 3. Severity accuracy (0-1)
    if expected_severity == "none":
        scores["Severity"] = 0.5  # N/A for clean contracts
    else:
        sev_match = re.search(r'(?i)\b(critical|high|medium|low|informational|gas)\b', text_lower)
        if sev_match:
            pred = sev_match.group(1).lower()
            ranks = {"critical": 5, "high": 4, "medium": 3, "low": 2, "informational": 1, "gas": 0}
            diff = abs(ranks.get(pred, 0) - ranks.get(expected_severity, 0))
            scores["Severity"] = 1.0 if diff == 0 else 0.5 if diff == 1 else 0.1
        else:
            scores["Severity"] = 0.0

    # 4. Technical depth (0-1)
    tech_terms = [
        'msg.sender', 'tx.origin', 'delegatecall', 'selfdestruct',
        'call{value', 'abi.encode', 'keccak256', 'require(',
        'mapping', 'storage', 'memory', 'modifier', 'interface',
        'assembly', 'unchecked', 'payable', 'fallback()', 'receive()',
    ]
    tech_count = sum(1 for t in tech_terms if t in text)
    reasoning_terms = ['because', 'therefore', 'this means', 'this allows',
                       'the attacker', 'leading to', 'step 1', 'first,']
    reason_count = sum(1 for r in reasoning_terms if r.lower() in text_lower)
    scores["Depth"] = min(1.0, 0.05 * tech_count + 0.1 * reason_count)

    # 5. Code presence (0-1)
    has_code = 1.0 if '```' in text else 0.0
    scores["Code"] = has_code

    # Overall weighted score
    weights = {"Structure": 0.2, "Detection": 0.35, "Severity": 0.15, "Depth": 0.2, "Code": 0.1}
    scores["Overall"] = sum(scores[k] * weights[k] for k in weights)

    return scores


def format_scores(scores):
    """Format scores as a readable markdown table."""
    lines = ["| Metric | Score |", "|--------|-------|"]
    emojis = {"Structure": "๐Ÿ“‹", "Detection": "๐ŸŽฏ", "Severity": "โš ๏ธ", "Depth": "๐Ÿ”ฌ", "Code": "๐Ÿ’ป", "Overall": "โญ"}
    for k, v in scores.items():
        emoji = emojis.get(k, "")
        bar = "โ–ˆ" * int(v * 10) + "โ–‘" * (10 - int(v * 10))
        lines.append(f"| {emoji} {k} | {bar} {v:.0%} |")
    return "\n".join(lines)


# โ”€โ”€ Model Loading โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€
print("๐Ÿ”„ Loading GRPO model...")
grpo_model = AutoModelForCausalLM.from_pretrained(
    GRPO_MODEL, use_cache=True, torch_dtype=torch.float32,
)
grpo_tokenizer = AutoTokenizer.from_pretrained(GRPO_MODEL)
grpo_pipe = pipeline("text-generation", model=grpo_model, tokenizer=grpo_tokenizer, device="cpu")
print("โœ… GRPO model loaded")

print("๐Ÿ”„ Loading base model...")
base_model = AutoModelForCausalLM.from_pretrained(
    BASE_MODEL, torch_dtype=torch.float32,
)
base_tokenizer = AutoTokenizer.from_pretrained(BASE_MODEL)
base_pipe = pipeline("text-generation", model=base_model, tokenizer=base_tokenizer, device="cpu")
print("โœ… Base model loaded")


# โ”€โ”€ Inference โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€
def run_single_audit(pipe, code, max_tokens=512):
    """Run audit with one model."""
    messages = [
        {"role": "system", "content": SYSTEM_PROMPT},
        {"role": "user", "content": f"Audit this smart contract for security vulnerabilities:\n\n```solidity\n{code}\n```"},
    ]
    result = pipe(messages, max_new_tokens=max_tokens, do_sample=False, return_full_text=False)
    output = result[0]["generated_text"]
    if isinstance(output, list):
        return output[-1]["content"]
    return str(output)


def run_comparison(code, test_case_name, max_tokens):
    """Run both models and score results."""
    if not code or not code.strip():
        return "โš ๏ธ Please enter Solidity code", "", "", "", ""

    max_tokens = int(max_tokens)

    # Get expected values from test case
    tc = TEST_CASES.get(test_case_name, {})
    expected_vuln = tc.get("expected_vuln", "unknown")
    expected_severity = tc.get("expected_severity", "unknown")
    tc_desc = tc.get("description", "Custom contract โ€” scoring against general audit quality")

    # If custom code, use "unknown" โ€” score on structure/depth only
    if test_case_name == "Custom (paste your own)":
        expected_vuln = "unknown"
        expected_severity = "unknown"

    # Run GRPO model
    t0 = time.time()
    grpo_result = run_single_audit(grpo_pipe, code, max_tokens)
    grpo_time = time.time() - t0

    # Run base model
    t0 = time.time()
    base_result = run_single_audit(base_pipe, code, max_tokens)
    base_time = time.time() - t0

    # Score both
    grpo_scores = score_audit(grpo_result, expected_vuln, expected_severity)
    base_scores = score_audit(base_result, expected_vuln, expected_severity)

    # Format score comparison
    comparison = f"### ๐Ÿ“Š Score Comparison\n\n**Test Case:** {test_case_name}\n"
    comparison += f"**Expected:** {expected_vuln} ({expected_severity})\n"
    comparison += f"**Description:** {tc_desc}\n\n"
    comparison += f"| Metric | ๐ŸŽฏ GRPO | ๐Ÿ“ฆ Base | Delta |\n"
    comparison += f"|--------|---------|---------|-------|\n"
    for k in ["Structure", "Detection", "Severity", "Depth", "Code", "Overall"]:
        g = grpo_scores[k]
        b = base_scores[k]
        delta = g - b
        arrow = "๐ŸŸข" if delta > 0.05 else "๐Ÿ”ด" if delta < -0.05 else "โšช"
        comparison += f"| {k} | {g:.0%} | {b:.0%} | {arrow} {delta:+.0%} |\n"
    comparison += f"\nโฑ๏ธ GRPO: {grpo_time:.1f}s | Base: {base_time:.1f}s"

    grpo_header = f"*Generated in {grpo_time:.1f}s โ€” Overall: {grpo_scores['Overall']:.0%}*\n\n"
    base_header = f"*Generated in {base_time:.1f}s โ€” Overall: {base_scores['Overall']:.0%}*\n\n"

    return grpo_header + grpo_result, base_header + base_result, comparison


def run_benchmark():
    """Run all test cases and return aggregate scores."""
    results = []
    grpo_total = 0
    base_total = 0
    n = 0

    for name, tc in TEST_CASES.items():
        code = tc["code"]
        expected_vuln = tc["expected_vuln"]
        expected_severity = tc["expected_severity"]

        grpo_result = run_single_audit(grpo_pipe, code, 512)
        base_result = run_single_audit(base_pipe, code, 512)

        grpo_scores = score_audit(grpo_result, expected_vuln, expected_severity)
        base_scores = score_audit(base_result, expected_vuln, expected_severity)

        grpo_total += grpo_scores["Overall"]
        base_total += base_scores["Overall"]
        n += 1

        g_ov = grpo_scores["Overall"]
        b_ov = base_scores["Overall"]
        winner = "๐ŸŽฏ GRPO" if g_ov > b_ov + 0.05 else "๐Ÿ“ฆ Base" if b_ov > g_ov + 0.05 else "๐Ÿค Tie"
        results.append(f"| {name} | {g_ov:.0%} | {b_ov:.0%} | {winner} |")

    header = "## ๐Ÿ† Full Benchmark Results\n\n"
    header += f"**GRPO Average: {grpo_total/n:.0%}** | **Base Average: {base_total/n:.0%}**\n\n"
    header += "| Test Case | GRPO | Base | Winner |\n|-----------|------|------|--------|\n"
    return header + "\n".join(results)


def load_test_case(name):
    """Load a test case into the code editor."""
    if name == "Custom (paste your own)":
        return ""
    tc = TEST_CASES.get(name, {})
    return tc.get("code", "")


# โ”€โ”€ UI โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€
with gr.Blocks(
    title="๐Ÿ” Smart Contract Security Auditor",
    theme=gr.themes.Soft(),
    css="""
    .score-box { padding: 10px; border-radius: 8px; }
    """
) as demo:
    gr.Markdown(
        "# ๐Ÿ” Smart Contract Security Auditor\n"
        "### GRPO-Trained vs Base Model โ€” Side-by-Side Comparison\n\n"
        "Compare [`oxdev/security-auditor-grpo`](https://huggingface.co/oxdev/security-auditor-grpo) "
        "(GRPO-trained on 327 real audit findings) against "
        "[`Qwen/Qwen2.5-Coder-0.5B-Instruct`](https://huggingface.co/Qwen/Qwen2.5-Coder-0.5B-Instruct) (base).\n\n"
        "โฑ๏ธ **Note:** Running on CPU โ€” each audit takes ~30-90 seconds per model."
    )

    with gr.Tab("๐Ÿ” Single Audit"):
        with gr.Row():
            with gr.Column(scale=2):
                test_case_dropdown = gr.Dropdown(
                    choices=list(TEST_CASES.keys()) + ["Custom (paste your own)"],
                    value="๐Ÿ” Reentrancy (Classic)",
                    label="Select Test Case",
                    interactive=True,
                )
                code_input = gr.Code(
                    label="Solidity Contract",
                    language=None,
                    lines=22,
                    value=TEST_CASES["๐Ÿ” Reentrancy (Classic)"]["code"],
                    interactive=True,
                )
            with gr.Column(scale=1):
                max_tokens_slider = gr.Slider(
                    minimum=128, maximum=1024, value=512, step=64,
                    label="Max Output Tokens",
                )
                run_btn = gr.Button("๐Ÿ” Run Audit Comparison", variant="primary", size="lg")
                gr.Markdown(
                    "**How Scoring Works:**\n"
                    "- ๐Ÿ“‹ **Structure** (20%): FINDING format, sections, fields\n"
                    "- ๐ŸŽฏ **Detection** (35%): Identifies the correct vulnerability\n"
                    "- โš ๏ธ **Severity** (15%): Correct severity level\n"
                    "- ๐Ÿ”ฌ **Depth** (20%): Technical terms, reasoning\n"
                    "- ๐Ÿ’ป **Code** (10%): Includes code examples"
                )

        with gr.Row():
            comparison_output = gr.Markdown(label="Score Comparison")

        with gr.Row():
            with gr.Column():
                gr.Markdown("### ๐ŸŽฏ GRPO-Trained Auditor")
                grpo_output = gr.Markdown(label="GRPO Output")
            with gr.Column():
                gr.Markdown("### ๐Ÿ“ฆ Base Qwen2.5-Coder-0.5B-Instruct")
                base_output = gr.Markdown(label="Base Output")

        test_case_dropdown.change(
            fn=load_test_case,
            inputs=test_case_dropdown,
            outputs=code_input,
        )

        run_btn.click(
            fn=run_comparison,
            inputs=[code_input, test_case_dropdown, max_tokens_slider],
            outputs=[grpo_output, base_output, comparison_output],
            concurrency_limit=1,
        )

    with gr.Tab("๐Ÿ† Full Benchmark"):
        gr.Markdown(
            "Run all 7 test cases and compare aggregate performance.\n\n"
            "โฑ๏ธ **Warning:** This takes 5-10 minutes on CPU (14 model inferences total)."
        )
        bench_btn = gr.Button("๐Ÿ† Run Full Benchmark", variant="primary", size="lg")
        bench_output = gr.Markdown(label="Benchmark Results")
        bench_btn.click(
            fn=run_benchmark,
            outputs=bench_output,
            concurrency_limit=1,
        )

    with gr.Tab("โ„น๏ธ About"):
        gr.Markdown("""
## Model Details

### ๐ŸŽฏ GRPO-Trained Auditor (`oxdev/security-auditor-grpo`)
- **Architecture:** Qwen2ForCausalLM, 0.5B parameters
- **Training:** Group Relative Policy Optimization (GRPO) on 327 synthetic smart contract audit samples
- **Reward Functions:** Format compliance, finding rate
- **Training Results:** Format reward improved 16ร— (0.025 โ†’ 0.40), finding rate 0% โ†’ 50-75%

### ๐Ÿ“ฆ Base Model (`Qwen/Qwen2.5-Coder-0.5B-Instruct`)
- **Architecture:** Same Qwen2ForCausalLM, 0.5B parameters
- **Training:** Standard instruction tuning by Qwen team
- **Domain:** General code generation, not specialized for security

### ๐Ÿ“Š Training Data
- **V1 (used for current model):** 327 synthetic attack vector samples
- **V2 (pending training):** [50,902 real audit findings](https://huggingface.co/datasets/oxdev/smart-contract-security-audit-v2) from top security firms

### ๐Ÿ”ฌ Scoring Methodology
Each audit response is scored on 5 dimensions:
1. **Structure (20%)** โ€” Does it use the FINDING format with required fields?
2. **Detection (35%)** โ€” Does it identify the correct vulnerability class?
3. **Severity (15%)** โ€” Does it assign the correct severity level?
4. **Depth (20%)** โ€” Technical terminology, reasoning chains, specificity
5. **Code (10%)** โ€” Includes code examples (exploit PoC, fix)

### ๐Ÿ”— Resources
- [Model on Hub](https://huggingface.co/oxdev/security-auditor-grpo)
- [Training Dataset V2](https://huggingface.co/datasets/oxdev/smart-contract-security-audit-v2)
- [GitHub Repository](https://github.com/0xedev/skills)
        """)

demo.queue(max_size=5, default_concurrency_limit=1)

if __name__ == "__main__":
    demo.launch()