#!/usr/bin/env python3
from __future__ import annotations

import py_compile
import subprocess
import sys
from pathlib import Path

ROOT = Path(__file__).resolve().parents[1]
if hasattr(sys.stdout, "reconfigure"):
    sys.stdout.reconfigure(encoding="utf-8", errors="replace")
if hasattr(sys.stderr, "reconfigure"):
    sys.stderr.reconfigure(encoding="utf-8", errors="replace")
TEXT_SUFFIXES = {
    ".c",
    ".cc",
    ".cpp",
    ".h",
    ".hpp",
    ".ini",
    ".json",
    ".md",
    ".ps1",
    ".py",
    ".txt",
    ".yaml",
    ".yml",
}
SKIP_PATHS = {
    ".vscode/c_cpp_properties.json",
    ".vscode/launch.json",
}


def tracked_and_untracked_files() -> list[Path]:
    result = subprocess.run(
        ["git", "ls-files", "--cached", "--others", "--exclude-standard"],
        cwd=ROOT,
        text=True,
        encoding="utf-8",
        stdout=subprocess.PIPE,
        stderr=subprocess.PIPE,
    )
    if result.returncode != 0:
        print(result.stderr, end="")
        raise SystemExit(result.returncode)
    return [ROOT / line.strip() for line in result.stdout.splitlines() if line.strip()]


def is_text_candidate(path: Path) -> bool:
    rel = path.relative_to(ROOT).as_posix()
    if rel in SKIP_PATHS:
        return False
    return path.suffix.lower() in TEXT_SUFFIXES


def main() -> int:
    errors: list[str] = []
    for path in tracked_and_untracked_files():
        if not path.is_file() or not is_text_candidate(path):
            continue
        rel = path.relative_to(ROOT).as_posix()
        try:
            text = path.read_text(encoding="utf-8")
        except UnicodeDecodeError as exc:
            errors.append(f"{rel}: not valid UTF-8: {exc}")
            continue
        for line_no, line in enumerate(text.splitlines(), 1):
            if line.startswith(("<<<<<<<", "=======", ">>>>>>>")):
                errors.append(f"{rel}:{line_no}: merge conflict marker")

    for script in sorted((ROOT / "tools").glob("*.py")):
        try:
            py_compile.compile(str(script), doraise=True)
        except py_compile.PyCompileError as exc:
            errors.append(str(exc))

    if not (ROOT / ".clang-format").exists():
        print("No .clang-format found; source formatting is not reformatted by this check.")
    print("Checked text encodings, conflict markers, and Python syntax.")

    if errors:
        for error in errors:
            print(error)
        return 1
    return 0


if __name__ == "__main__":
    raise SystemExit(main())