"""Development stand-in for the real panel: saves each frame as a PNG instead
of writing to hardware, so the scheduler/rendering logic can be exercised off
the Pi.
"""

import logging
from pathlib import Path

from PIL import Image

from display import Display

logger = logging.getLogger(__name__)


class MockDisplay(Display):
    def __init__(self, resolution: tuple[int, int], out_dir: str = "./mock_output"):
        self.resolution = resolution
        self.out_dir = Path(out_dir)
        self.out_dir.mkdir(parents=True, exist_ok=True)
        self._frame_count = 0

    def init(self) -> None:
        logger.info("MockDisplay initialized (resolution=%s)", self.resolution)

    def show(self, image: Image.Image) -> None:
        self._frame_count += 1
        path = self.out_dir / "current.png"
        image.save(path)
        history_path = self.out_dir / f"frame_{self._frame_count:04d}.png"
        image.save(history_path)
        logger.info("MockDisplay: wrote frame to %s", path)

    def sleep(self) -> None:
        logger.info("MockDisplay: sleep")