#!/usr/bin/env python3
"""Watch src/ for changes and rebuild dist/asw.css."""

import os
import subprocess
import pyinotify

WATCH_DIR = os.path.expanduser("~/projects/asw/src")
BUILD_CMD = ["npm", "run", "build"]

class RebuildHandler(pyinotify.ProcessEvent):
    def process_default(self, event):
        if event.name and event.name.endswith(".css"):
            print(f"[watch] {event.name} changed → rebuilding...")
            result = subprocess.run(BUILD_CMD, cwd=os.path.dirname(WATCH_DIR),
                                    capture_output=True, text=True)
            if result.returncode == 0:
                print("[watch] Build OK")
            else:
                print(f"[watch] Build FAILED:\n{result.stderr}")

def main():
    wm = pyinotify.WatchManager()
    mask = pyinotify.IN_MODIFY | pyinotify.IN_CREATE | pyinotify.IN_DELETE
    handler = RebuildHandler()
    notifier = pyinotify.Notifier(wm, handler)
    wm.add_watch(WATCH_DIR, mask, rec=True)
    print(f"[watch] Watching {WATCH_DIR} for changes. Ctrl+C to stop.")
    notifier.loop()

if __name__ == "__main__":
    main()