#!/usr/bin/env python
# License: GPLv3 Copyright: 2026, Kovid Goyal <kovid at kovidgoyal.net>


import concurrent.futures
import hashlib
import json
import os
import subprocess
import sys
import tempfile
import threading

base = os.path.dirname(os.path.abspath(__file__))

ruff = subprocess.Popen(['ruff', 'format'], cwd=base, stderr=subprocess.STDOUT, stdout=subprocess.PIPE)
go = subprocess.Popen('gofmt -s -l -w tools kittens'.split(), cwd=base, stderr=subprocess.STDOUT, stdout=subprocess.PIPE)
ruff_output = b''
go_output = b''


def wait_ruff() -> None:
    global ruff_output
    ruff_output = ruff.communicate()[0]


def wait_go() -> None:
    global go_output
    go_output = go.communicate()[0]


threading.Thread(target=wait_ruff).start()
threading.Thread(target=wait_go).start()

clang_files = []
for x in os.listdir(base):
    if x in ('dist', 'build', 'bypy', '3rdparty') or x.startswith('.'):
        continue
    for root, dirnames, files in os.walk(os.path.join(base, x)):
        for file in files:
            if file.startswith('wayland-') and os.path.basename(root) == 'glfw':
                continue
            ext = os.path.splitext(file)[1]
            if ext in ('.c', '.h', '.m', '.slang'):
                clang_files.append(os.path.join(root, file))

CACHE_DIR = os.path.join(base, '.cache', 'autoformat')
CACHE_FILE = os.path.join(CACHE_DIR, 'clang_format.json')


def data_hash(src: bytes) -> str:
    return hashlib.md5(src).hexdigest()


def file_hash(path: str) -> tuple[str, bytes]:
    with open(path, 'rb') as f:
        src = f.read()
    return data_hash(src), src


def load_cache() -> dict[str, str]:
    try:
        with open(CACHE_FILE) as f:
            return json.load(f)
    except (FileNotFoundError, json.JSONDecodeError):
        return {}


def save_cache(cache: dict[str, str]) -> None:
    os.makedirs(CACHE_DIR, exist_ok=True)
    fd, tmp = tempfile.mkstemp(dir=CACHE_DIR)
    try:
        with os.fdopen(fd, 'w') as f:
            json.dump(cache, f, indent=2)
        os.replace(tmp, CACHE_FILE)
    except Exception:
        os.unlink(tmp)
        raise


cache: dict[str, str] = load_cache()
cache_lock = threading.Lock()


def run_clang_format(file_path: str) -> tuple[bool, str, str]:
    rel_path = os.path.relpath(file_path, base)
    current_hash, src = file_hash(file_path)

    with cache_lock:
        if cache.get(rel_path) == current_hash:
            return True, '', ''

    fn = file_path
    sf = '.clang-format'
    if file_path.endswith('.slang'):
        fn += '.cs'
        sf = '.clang-format-for-slang'
    cmd = ['clang-format', '--style=file:' + sf, '--assume-filename=' + fn]
    result = subprocess.run(cmd, capture_output=True, input=src)
    if result.returncode != 0:
        return False, file_path, result.stderr.decode()
    if result.stdout:
        new_hash = data_hash(result.stdout)
        with open(file_path, 'wb') as f:
            f.write(result.stdout)
    else:
        new_hash = current_hash

    with cache_lock:
        cache[rel_path] = new_hash

    return True, '', ''


clang_failed = False
with concurrent.futures.ThreadPoolExecutor(max_workers=os.cpu_count()) as executor:
    futures = {executor.submit(run_clang_format, f): f for f in clang_files}
    for future in concurrent.futures.wait(futures)[0]:
        success, file_path, error_msg = future.result()
        if not success:
            print(f'[FAILED] {file_path}\n{error_msg}', file=sys.stderr)
            clang_failed = True

save_cache(cache)

ruff.wait()
go.wait()
if ruff.wait() != 0:
    sys.stderr.buffer.write(ruff_output)
    raise SystemExit('Formatting of Python code failed')
if go.wait() != 0:
    sys.stderr.buffer.write(go_output)
    raise SystemExit('Formatting of Go code failed')
raise SystemExit('Formatting of C files failed' if clang_failed else 0)