# /// script
# requires-python = ">=3.11"
# dependencies = ["pillow"]
# ///
"""Create the preview image (512x512) and name plate (358x86) for the Gaussian XR gallery.

Usage: uv run make_gallery.py <run folder> <pipeline log> <display name> <file stem>
Reads the initial view from the log ("Gaussian XR initial view: cam0/... Display rotation X°")
and writes <file stem>.gallery.png and <file stem>.sceneinfo.png into the run folder.
The look matches the example scenes that ship with Gaussian XR.
"""
import re
import sys
from pathlib import Path

from PIL import Image, ImageDraw, ImageEnhance, ImageFilter, ImageFont, ImageStat

FONTS = [
    "/usr/share/fonts/google-noto/NotoSans-Regular.ttf",
    "/usr/share/fonts/dejavu-sans-fonts/DejaVuSans.ttf",
    "/usr/share/fonts/liberation-sans/LiberationSans-Regular.ttf",
    "/usr/share/fonts/truetype/noto/NotoSans-Regular.ttf",          # Debian/Ubuntu
    "/usr/share/fonts/truetype/dejavu/DejaVuSans.ttf",
    "/usr/share/fonts/noto/NotoSans-Regular.ttf",                   # Arch
    "/usr/share/fonts/TTF/DejaVuSans.ttf",
]


def initial_view(run: Path, log: Path) -> tuple[Path, float]:
    match = None
    for match in re.finditer(
        r"Gaussian XR initial view: (\S+\.jpg) .*?Display rotation (-?[\d.]+)°",
        log.read_text(errors="replace"),
    ):
        pass  # the last message counts
    if match:
        image = next(run.glob(f"dataset/images/{match.group(1)}"), None)
        if image:
            return image, float(match.group(2))
    # No message: an image from the middle of the recording, not rotated
    images = sorted(run.glob("dataset/images/cam0/*.jpg"))
    if not images:
        sys.exit(f"No images found in {run}/dataset/images/cam0")
    return images[len(images) // 2], 0.0


def gallery(image: Path, rotation_ccw: float, out: Path) -> None:
    # PIL rotates counter-clockwise for positive angles; the pipeline already reports the CCW rotation
    img = Image.open(image).convert("RGB").rotate(rotation_ccw, expand=True)
    w, h = img.size
    side = int(min(w, h) * 0.8)  # cut away the fisheye border
    img = img.crop(((w - side) // 2, (h - side) // 2, (w + side) // 2, (h + side) // 2))
    img = img.resize((512, 512), Image.LANCZOS)
    # Brighten dark indoor shots without blowing out bright ones
    brightness = ImageStat.Stat(img.convert("L")).mean[0]
    if brightness < 110:
        img = ImageEnhance.Brightness(img).enhance(min(2.2, 110 / max(brightness, 1)))
    img = ImageEnhance.Contrast(img).enhance(1.1)
    img.convert("RGBA").save(out)


def label(text: str, out: Path) -> None:
    width, height = 358, 86
    img = Image.new("RGBA", (width, height), (0, 0, 0, 0))
    shadow = Image.new("RGBA", (width, height), (0, 0, 0, 0))
    ImageDraw.Draw(shadow).rounded_rectangle(
        (10, 10, width - 10, height - 10), radius=16, fill=(40, 46, 60, 200))
    img.alpha_composite(shadow.filter(ImageFilter.GaussianBlur(4)))
    draw = ImageDraw.Draw(img)
    draw.rounded_rectangle((14, 12, width - 14, height - 14), radius=14, fill=(64, 72, 90, 255))
    font_path = next((p for p in FONTS if Path(p).exists()), None)
    size = 34
    while True:  # shrink long names until they fit on the plate
        font = ImageFont.truetype(font_path, size) if font_path else ImageFont.load_default()
        box = draw.textbbox((0, 0), text, font=font)
        if box[2] - box[0] <= width - 50 or size <= 14 or not font_path:
            break
        size -= 2
    draw.text(
        ((width - (box[2] - box[0])) / 2 - box[0], (height - (box[3] - box[1])) / 2 - box[1] - 1),
        text, font=font, fill=(255, 255, 255, 255))
    img.save(out)


def main() -> None:
    if len(sys.argv) != 5:
        sys.exit(__doc__)
    run, log, name, stem = Path(sys.argv[1]), Path(sys.argv[2]), sys.argv[3], sys.argv[4]
    image, rotation = initial_view(run, log)
    gallery(image, rotation, run / f"{stem}.gallery.png")
    label(name, run / f"{stem}.sceneinfo.png")
    print(f"Preview image from {image.name} (rotation {rotation:g}°), name plate \"{name}\"")


if __name__ == "__main__":
    main()