"""
Wizard-Vibe Core — Hot Reload Watcher
======================================
Watches file changes and restarts the server automatically.
Uses inotify/file polling for cross-platform support.
"""

import os
import sys
import time
import subprocess
from pathlib import Path


WATCH_DIRS = ["."]
WATCH_EXTS = {".py", ".html", ".css", ".js"}
IGNORE_DIRS = {"__pycache__", ".git", "generated", "venv", ".venv"}


def get_mtimes(root: Path) -> dict:
    """Get mtimes for all watched files."""
    mtimes = {}
    for d in WATCH_DIRS:
        for path in Path(d).rglob("*"):
            if any(p in IGNORE_DIRS for p in path.parts):
                continue
            if path.is_file() and path.suffix in WATCH_EXTS:
                mtimes[str(path)] = path.stat().st_mtime
    return mtimes


def main():
    """Run the server with hot-reload."""
    print("🧙‍♂️ Wizard-Vibe Core — Hot Reload Watcher")
    print("   Watching: *.py, *.html, *.css, *.js")

    # Set hot-reload flag
    env = os.environ.copy()
    env["WIZARD_HOT_RELOAD"] = "1"

    proc = subprocess.Popen([sys.executable, "core.py"], env=env)
    last_mtimes = get_mtimes(Path("."))

    try:
        while True:
            time.sleep(1)
            current = get_mtimes(Path("."))

            if current != last_mtimes:
                changed = [k for k in current if current[k] != last_mtimes.get(k)]
                print(f"\n🔄 File change detected: {changed[0] if changed else 'unknown'}")
                print("   Restarting server...")

                proc.terminate()
                try:
                    proc.wait(timeout=5)
                except subprocess.TimeoutExpired:
                    proc.kill()

                proc = subprocess.Popen([sys.executable, "core.py"], env=env)
                last_mtimes = current
                print(f"   ✅ Server restarted (PID: {proc.pid})")

    except KeyboardInterrupt:
        print("\n🛑 Shutting down...")
        proc.terminate()
        proc.wait()


if __name__ == "__main__":
    main()