"""Screen capture utility.

`capture_screen()` grabs the current screen via mss and returns a PIL RGB
image. Bounding-box selection of the inventory area is done in the GUI by
two clicks (top-left + bottom-right) — far more reliable than heuristic
auto-detection across the many possible game UI scales and DPI settings.
"""

from __future__ import annotations

from dataclasses import dataclass
from typing import Tuple

from PIL import Image


@dataclass
class GridBBox:
    left: int
    top: int
    right: int
    bottom: int

    def as_tuple(self) -> Tuple[int, int, int, int]:
        return (self.left, self.top, self.right, self.bottom)


def capture_screen(monitor: int = 1) -> Image.Image:
    """Capture the full screen of the given monitor as a PIL RGB image.

    monitor=0 = all monitors combined, 1 = primary on most systems. Falls
    back to monitor 0 if the requested index is missing.
    """
    import mss  # lazy: keep mss optional for renderer/CLI-only use

    with mss.mss() as sct:
        try:
            mon = sct.monitors[monitor]
        except IndexError:
            mon = sct.monitors[0]
        shot = sct.grab(mon)
        img = Image.frombytes("RGB", shot.size, shot.bgra, "raw", "BGRX")
    return img