# agent_v1/vision/system_info.py
"""
Capture des metadonnees systeme pour enrichir les evenements.

Collecte DPI, resolution, fenetre active, moniteur, theme OS et langue.
Les fonctions Windows (ctypes.windll, winreg) ont des fallbacks gracieux
pour Linux/Mac.
"""

import platform
import locale
import logging
from typing import Any, Dict, List, Optional, Tuple

logger = logging.getLogger(__name__)

# Cache du systeme d'exploitation pour eviter les appels repetes
_SYSTEM = platform.system()


def get_dpi_scale() -> int:
    """Retourne le facteur DPI en % (100 = normal, 150 = haute resolution).

    Windows : ctypes.windll.user32.GetDpiForSystem()
    Linux/Mac : fallback 100

    NOTE : Le process DOIT deja etre DPI-aware (via SetProcessDpiAwareness(2)
    appele dans config.py) pour que GetDpiForSystem retourne le vrai DPI.
    """
    if _SYSTEM == "Windows":
        try:
            import ctypes
            dpi = ctypes.windll.user32.GetDpiForSystem()
            return round(dpi * 100 / 96)  # 96 DPI = 100%
        except Exception as e:
            logger.debug(f"Impossible de lire le DPI Windows : {e}")
            return 100
    return 100  # Linux/Mac fallback


def get_window_bounds() -> Optional[List[int]]:
    """Retourne [x, y, width, height] de la fenetre active.

    Windows : ctypes GetWindowRect(GetForegroundWindow())
    Linux/Mac : fallback None
    """
    if _SYSTEM == "Windows":
        try:
            import ctypes
            import ctypes.wintypes

            hwnd = ctypes.windll.user32.GetForegroundWindow()
            if not hwnd:
                return None
            rect = ctypes.wintypes.RECT()
            ctypes.windll.user32.GetWindowRect(hwnd, ctypes.byref(rect))
            return [
                rect.left,
                rect.top,
                rect.right - rect.left,
                rect.bottom - rect.top,
            ]
        except Exception as e:
            logger.debug(f"Impossible de lire les bounds fenetre : {e}")
            return None

    # Linux : tentative via xdotool
    if _SYSTEM == "Linux":
        try:
            import subprocess

            wid = subprocess.check_output(
                ["xdotool", "getactivewindow"],
                stderr=subprocess.DEVNULL,
            ).decode().strip()
            geom = subprocess.check_output(
                ["xdotool", "getwindowgeometry", "--shell", wid],
                stderr=subprocess.DEVNULL,
            ).decode()
            # Parse "X=...\nY=...\nWIDTH=...\nHEIGHT=..."
            vals: Dict[str, int] = {}
            for line in geom.strip().splitlines():
                if "=" in line:
                    k, v = line.split("=", 1)
                    vals[k.strip()] = int(v.strip())
            if {"X", "Y", "WIDTH", "HEIGHT"} <= vals.keys():
                return [vals["X"], vals["Y"], vals["WIDTH"], vals["HEIGHT"]]
        except Exception:
            pass

    return None


def get_monitor_info() -> Tuple[int, List[Dict[str, int]]]:
    """Retourne (monitor_index, liste_moniteurs).

    Chaque moniteur : {width, height, x, y}
    monitor_index : index du moniteur contenant la fenetre active
    """
    monitors: List[Dict[str, int]] = []
    active_index = 0

    try:
        import mss

        with mss.mss() as sct:
            for mon in sct.monitors[1:]:  # Skip le moniteur virtuel (index 0)
                monitors.append({
                    "width": mon["width"],
                    "height": mon["height"],
                    "x": mon["left"],
                    "y": mon["top"],
                })
    except Exception as e:
        logger.debug(f"mss indisponible, resolution par defaut : {e}")
        monitors = [{"width": 1920, "height": 1080, "x": 0, "y": 0}]

    # Determiner quel moniteur contient la fenetre active
    bounds = get_window_bounds()
    if bounds and len(monitors) > 1:
        wx, wy = bounds[0], bounds[1]
        for i, mon in enumerate(monitors):
            if (mon["x"] <= wx < mon["x"] + mon["width"]
                    and mon["y"] <= wy < mon["y"] + mon["height"]):
                active_index = i
                break

    return active_index, monitors


def get_os_theme() -> str:
    """Retourne 'light', 'dark' ou 'unknown'."""
    if _SYSTEM == "Windows":
        try:
            import winreg

            key = winreg.OpenKey(
                winreg.HKEY_CURRENT_USER,
                r"Software\Microsoft\Windows\CurrentVersion\Themes\Personalize",
            )
            value, _ = winreg.QueryValueEx(key, "AppsUseLightTheme")
            winreg.CloseKey(key)
            return "light" if value == 1 else "dark"
        except Exception as e:
            logger.debug(f"Impossible de lire le theme Windows : {e}")
            return "unknown"

    # Linux : tentative via gsettings (GNOME)
    if _SYSTEM == "Linux":
        try:
            import subprocess

            result = subprocess.check_output(
                ["gsettings", "get", "org.gnome.desktop.interface", "color-scheme"],
                stderr=subprocess.DEVNULL,
            ).decode().strip().strip("'\"")
            if "dark" in result.lower():
                return "dark"
            elif "light" in result.lower() or "default" in result.lower():
                return "light"
        except Exception:
            pass

    return "unknown"


def get_os_language() -> str:
    """Retourne le code langue (fr, en, de, etc.)."""
    try:
        lang = locale.getdefaultlocale()[0]  # ex: 'fr_FR'
        if lang:
            return lang[:2]  # ex: 'fr'
    except Exception:
        pass
    return "unknown"


def get_screen_metadata() -> Dict[str, Any]:
    """Capture toutes les metadonnees systeme en une fois.

    Appelee une fois au demarrage + a chaque changement de focus.
    Resultat injecte dans les evenements envoyes au serveur.
    """
    monitor_index, monitors = get_monitor_info()
    primary = monitors[0] if monitors else {"width": 1920, "height": 1080}

    return {
        "dpi_scale": get_dpi_scale(),
        "monitor_index": monitor_index,
        "monitors": monitors,
        "screen_resolution": [primary["width"], primary["height"]],
        "window_bounds": get_window_bounds(),
        "os_theme": get_os_theme(),
        "os_language": get_os_language(),
    }