#!/usr/bin/env python3
"""
Clang compiler implementation.
"""

from typing import Optional
from .base_gcc import BaseGCCCompiler
import subprocess


class ClangCompiler(BaseGCCCompiler):
    """Clang compiler implementation."""
    
    def __init__(self, executable: str = "clang"):
        """
        Initialize Clang compiler.
        
        Args:
            executable: Compiler executable name ("clang")
        """
        super().__init__("Clang", executable)
    
    def get_version(self) -> Optional[str]:
        """
        Get the Clang version string.
        
        Returns:
            Version string if available, None otherwise
        """
        try:
            result = subprocess.run(
                [self.executable, "--version"],
                capture_output=True,
                text=True,
                check=False
            )
            if result.returncode == 0 and result.stdout:
                # Parse first line of version output
                first_line = result.stdout.strip().split('\n')[0]
                return first_line
        except Exception:
            pass
        
        return None


def detect_clang_compiler() -> Optional[ClangCompiler]:
    """
    Detect and return an available Clang compiler.
    
    Returns:
        ClangCompiler instance if found, None otherwise
    """
    from build_system.utils import which
    
    # Try to find Clang
    compilers = ["clang", "clang-18", "clang-17", "clang-16", "clang-15"]
    
    for compiler in compilers:
        if which(compiler):
            return ClangCompiler(compiler)
    
    return None