"""Tiny widget-region placeholder image, shared by every widget-type
module for the "not configured yet" / "temporarily unavailable" case --
deliberately much simpler than image_pipeline.render_placeholder (no QR
code, no full-panel-scale fonts): a widget's own region can be a small
fraction of the panel, so its placeholder needs to scale down with it.
"""

from __future__ import annotations

from PIL import Image, ImageDraw, ImageFont

_BG = (245, 245, 245)
_FG = (90, 90, 90)


def placeholder_image(target_w: int, target_h: int, lines: list[str]) -> Image.Image:
    img = Image.new("RGB", (target_w, target_h), _BG)
    draw = ImageDraw.Draw(img)
    font_size = max(10, min(20, target_h // 8))
    font = ImageFont.load_default(size=font_size)
    line_h = font_size + 4
    total_h = line_h * len(lines)
    y = max(4, (target_h - total_h) // 2)
    for line in lines:
        bbox = draw.textbbox((0, 0), line, font=font)
        line_w = bbox[2] - bbox[0]
        x = max(4, (target_w - line_w) // 2)
        draw.text((x, y), line, fill=_FG, font=font)
        y += line_h
    return img
