#!/usr/bin/env python3
"""Pre-commit hook for detecting hardcoded secrets.

Checks files for common secret patterns:
- API keys
- AWS credentials
- Private keys
- Passwords
- Tokens
"""

import re
import sys
from pathlib import Path

SECRET_PATTERNS = [
    {
        'name': 'OpenAI API Key',
        "name": "OpenAI API Key",
        "pattern": r"sk-[a-zA-Z0-9]{32,}",
        "severity": "HIGH",
    },
    {
        "name": "AWS Access Key",
        "pattern": r"AKIA[0-9A-Z]{16}",
        "severity": "HIGH",
    },
    {
        "name": "Private Key",
        "pattern": r"-----BEGIN[A-Z ]+PRIVATE KEY-----",
        "severity": "HIGH",
    },
    {
        "name": "Generic API Key",
        "pattern": r'(?i)(api[_-]?key|apikey)\s*[:=]\s*["\']([a-zA-Z0-9_\-]{20,})["\']',
        "severity": "HIGH",
    },
    {
        "name": "Password in Code",
        "pattern": r'(?i)password\s*[:=]\s*["\'](?!.*\{.*\})([^"\']{8,})["\']',
        "severity": "HIGH",
    },
    {
        "name": "Bearer Token",
        "pattern": r"bearer\s+[a-zA-Z0-9_\-\.]{20,}",
        "severity": "HIGH",
    },
    {
        "name": "GitHub Token",
        "pattern": r"gh[pousr]_[a-zA-Z0-9]{36,}",
        "severity": "HIGH",
    },
    {
        "name": "Slack Token",
        "pattern": r"xox[baprs]-[a-zA-Z0-9-]{10,}",
        "severity": "HIGH",
    },
]


# Patterns to exclude (common false positives)
EXCLUDE_PATTERNS = [
    r"example\.com",
    r"your[_-]?api[_-]?key",
    r"your[_-]?password",
    r"<API[_-]?KEY>",
    r"\[API[_-]?KEY\]",
    r"\$\{",  # Environment variable substitution
    r"os\.environ",  # Reading from env vars
    r"secrets\.",  # GitHub secrets
    r"getenv",  # Reading from env
]


def is_false_positive(line: str) -> bool:
    """Check if a line is likely a false positive."""
    for pattern in EXCLUDE_PATTERNS:
        if re.search(pattern, line, re.IGNORECASE):
            return True
    return False


def check_file_for_secrets(filepath: str) -> list[dict]:
    """Check a file for hardcoded secrets.

    Args:
        filepath: Path to file to check

    Returns:
        List of findings
    """
    try:
        with open(filepath, "r", encoding="utf-8") as f:
            content = f.read()
    except Exception:
        return []  # Skip files we can't read

    findings = []
    lines = content.split("\n")

    for i, line in enumerate(lines, start=1):
        # Skip comments in common languages
        stripped = line.strip()
        if any(stripped.startswith(c) for c in ["#", "//", "/*", "*", "--"]):
            continue

        # Skip if line is a false positive
        if is_false_positive(line):
            continue

        for pattern_info in SECRET_PATTERNS:
            matches = re.finditer(pattern_info["pattern"], line)

            for match in matches:
                findings.append(
                    {
                        "name": pattern_info["name"],
                        "severity": pattern_info["severity"],
                        "line": i,
                        "match": match.group(0)[:50] + "..."
                        if len(match.group(0)) > 50
                        else match.group(0),
                    }
                )

    return findings


def main():
    """Run secret detection."""
    files = sys.argv[1:]

    if not files:
        return 0

    has_secrets = False
    total_findings = 0

    for filepath in files:
        findings = check_file_for_secrets(filepath)

        if not findings:
            continue

        total_findings += len(findings)
        has_secrets = True

        print(f"\n{'=' * 60}")
        print(f"🔐 Potential secrets detected in: {filepath}")
        print("=" * 60)

        for finding in findings:
            print(f"\n🔴 [{finding['severity']}] {finding['name']}")
            print(f"   Line: {finding['line']}")
            print(f"   Match: {finding['match']}")

    if has_secrets:
        print(f"\n{'=' * 60}")
        print(f"Total potential secrets: {total_findings}")
        print("=" * 60)
        print("\n❌ COMMIT BLOCKED: Potential hardcoded secrets detected")
        print("\nIf these are false positives:")
        print("  1. Use environment variables: os.environ.get('API_KEY')")
        print("  2. Use a secrets manager")
        print("  3. Add to .gitignore if it's a config file")
        print("\nTo bypass (not recommended): git commit --no-verify")
        return 1

    return 0


if __name__ == "__main__":