"""
modules/app_monitor.py — FRIDAY Tracks What's Playing

Monitors active applications and detects:
- What app is in focus
- If video/audio is playing
- Browser video detection
- Media state detection
"""

import time
import os
import json
import subprocess
from config import DATA_DIR


MONITOR_FILE = os.path.join(DATA_DIR, "app_monitor.json")


def _load() -> dict:
    if not os.path.exists(MONITOR_FILE):
        return {"active": "", "title": "", "last_change": 0, "media_playing": False}
    try:
        with open(MONITOR_FILE, "r") as f:
            return json.load(f)
    except Exception:
        return {"active": "", "title": "", "last_change": 0, "media_playing": False}


def _save(data: dict):
    os.makedirs(DATA_DIR, exist_ok=True)
    try:
        with open(MONITOR_FILE, "w") as f:
            json.dump(data, f, indent=2)
    except Exception:
        pass


# ── Get Active Window ───────────────────────────────────────────────

def get_active_window() -> dict:
    """Get currently active window info."""
    try:
        import psutil

        # Get foreground window
        foreground = psutil.Process()._proc.info.get('name')

        # Use Windows API for window title
        import ctypes
        from ctypes import wintypes

        user32 = ctypes.windll.user32
        hwnd = user32.GetForegroundWindow()
        length = user32.GetWindowTextLengthW(hwnd)
        if length > 0:
            buffer = ctypes.create_unicode_buffer(length + 1)
            user32.GetWindowTextW(hwnd, buffer, length + 1)
            title = buffer.value
        else:
            title = ""

        return {"hwnd": hwnd, "title": title[:100], "time": time.time()}

    except Exception:
        return {"title": "", "time": time.time()}


# ── Detect Video Playing ─────────────────────────────────────

def is_video_playing() -> bool:
    """Detect if video/media is playing."""
    data = _load()
    title = data.get("title", "").lower()
    active = data.get("active", "").lower()

    # Browser video detection
    video_patterns = ["youtube", "netflix", "prime", "disney", "hulu", "spotify", "twitch"]

    for pattern in video_patterns:
        if pattern in title or pattern in active:
            return True

    return is_media_playing()


def get_current_app() -> str:
    """Get current active application."""
    return _load().get("active", "")


def get_current_title() -> str:
    """Get current window title."""
    return _load().get("title", "")


def get_current_app() -> str:
    """Get current active application."""
    return _load().get("active", "")


def get_current_title() -> str:
    """Get current window title."""
    return _load().get("title", "")


# ── Background Monitor ─────────────────────────────────────────

def check_active():
    """Check and update active window."""
    try:
        window = get_active_window()
        title = window.get("title", "")

        # Determine app from title
        app = "unknown"
        if "youtube" in title.lower():
            app = "YouTube"
        elif "chrome" in title.lower():
            app = "Chrome"
        elif "edge" in title.lower():
            app = "Edge"
        elif "spotify" in title.lower():
            app = "Spotify"
        elif "discord" in title.lower():
            app = "Discord"
        elif "code" in title.lower():
            app = "VS Code"
        elif "game" in title.lower():
            app = "Game"

        data = _load()
        data["active"] = app
        data["title"] = title[:100]
        data["last_change"] = time.time()
        data["media_playing"] = title.lower().find("playing") > 0 or title.lower().find("youtube") > 0
        _save(data)

        return data

    except Exception:
        return _load()


# ── Media State ───────────────────────────────────────────────

def set_media_state(playing: bool):
    """Set media playing state."""
    data = _load()
    data["media_playing"] = playing
    data["media_time"] = time.time()
    _save(data)


def is_media_playing() -> bool:
    """Check if media is playing."""
    return _load().get("media_playing", False)


# ── Background Loop ──────────────────────────────────────────

def start_monitor():
    """Start app monitor in background."""
    import threading
    import time

    def _loop():
        while True:
            try:
                check_active()
            except Exception:
                pass
            time.sleep(2)  # Check every 2 seconds

    t = threading.Thread(target=_loop, daemon=True)
    t.start()


# ── Brain Integration ─────────────────────────────────────────

def get_app_context() -> str:
    """Get app context for brain."""
    data = _load()

    parts = []
    active = data.get("active", "")
    title = data.get("title", "")

    if active:
        parts.append(f"On: {active}")

    if is_media_playing():
        parts.append("Media playing")

    if parts:
        return "[APP] " + " | ".join(parts)

    return ""