import re
import subprocess
import sys


def clang_format(file_path):
    command = ["clang-format", "--dry-run", file_path]
    try:
        output = subprocess.check_output(command, stderr=subprocess.STDOUT, text=True)
    except subprocess.CalledProcessError as e:
        output = e.output
    except FileNotFoundError as e:
        print(f"Commande non trouvé : {e.filename}", file=sys.stderr)
        print(
            "clang est requis pour utilisé ce programme, installé-le via "
            f"votre gestionnaire de paquet : {e.filename}",
            file=sys.stderr,
        )
        exit(1)

    return output


def parse_clang_format_output(output):
    error_pattern = (
        r"(?P<filename>.+):(?P<line_number>\d+):(?P<column_number>\d+):"
        + r" warning: code should be clang-formatted \[(?P<warning_message>.+)\]"
    )
    error_matches = re.finditer(error_pattern, output)

    if error_matches:
        errors = []
        for error_match in error_matches:
            filename = error_match.group("filename")
            line_number = int(error_match.group("line_number"))
            column_number = int(error_match.group("column_number"))
            warning_message = error_match.group("warning_message")

            errors.append(
                {
                    "filename": filename,
                    "line_number": line_number,
                    "column_number": column_number,
                    "warning_message": warning_message[1:],
                }
            )

        return errors

    return None


if __name__ == "__main__":
    clang_format_output = clang_format("tests/1.c")
    parsed_output = parse_clang_format_output(clang_format_output)

    if parsed_output:
        for error in parsed_output:
            print(
                f"Warning dans {error['filename']} à la ligne {error['line_number']},"
                + f" caractère {error['column_number']} : {error['warning_message']}"
            )
    else:
        print("No warnings found.")