import sys, os
from pathlib import Path
import numpy as np
from PIL import Image

# ==== 可按需改动的常量 ====
IMG_ROOT = "automatic_camera_test_demo"
ANN_ROOT = "automatic_camera_test"
TILE_WIDTH = 512       # 每张缩略图统一宽度
PADDING = 8            # 小图之间的间距（像素）
OUT_PATH = "thumb.png"

def load_rgba(path: Path):
    return Image.open(path).convert("RGBA") if path.exists() else None

def resize_w(img: Image.Image, w: int):
    if img is None: return None
    ow, oh = img.size
    if ow == w: return img
    nh = int(round(oh * (w / ow)))
    return img.resize((w, nh), Image.BICUBIC)

def load_depth_as_img(npy_path: Path, width: int):
    if not npy_path.exists(): return None
    d = np.load(npy_path)
    # 你的深度处理：clip 到 [0, 2048]
    np.clip(d, 0.0, 2048.0, out=d)
    # 线性映射到 0~255 灰度（2048 对应 255）
    d = (d / 2048.0 * 255.0).astype(np.uint8)
    img = Image.fromarray(d, mode="L").convert("RGBA")
    return resize_w(img, width)

def make_column(rgb, seg, depth, pad=PADDING):
    tiles = [x for x in (rgb, seg, depth) if x is not None]
    if not tiles: return None
    w = max(t.size[0] for t in tiles)
    h = sum(t.size[1] for t in tiles) + pad * (len(tiles) - 1)
    col = Image.new("RGBA", (w, h), (255, 255, 255, 255))
    y = 0
    for t in tiles:
        col.paste(t, (0, y))
        y += t.size[1] + pad
    return col

def main():
    if len(sys.argv) < 3:
        print("用法: python make_thumbs_simple.py <scene_name> <pose1,pose2,...> [out.png]")
        print("示例: python make_thumbs_simple.py Hospital_A 0001,0007,0042 thumbs.png")
        sys.exit(1)

    scene = sys.argv[1]
    poses = [p.strip() for p in sys.argv[2].split(",") if p.strip()]
    out_path = Path(sys.argv[3]) if len(sys.argv) >= 4 else Path(OUT_PATH)

    columns = []
    for pose in poses:
        rgb_path   = Path(IMG_ROOT) / scene / pose / "lit.png"
        seg_path   = Path(ANN_ROOT) / scene / pose / "seg.png"
        depth_path = Path(ANN_ROOT) / scene / pose / "depth.npy"

        rgb   = resize_w(load_rgba(rgb_path), TILE_WIDTH)
        seg   = resize_w(load_rgba(seg_path), TILE_WIDTH)
        depth = load_depth_as_img(depth_path, TILE_WIDTH)

        col = make_column(rgb, seg, depth, PADDING)
        if col is None:
            print(f"[WARN] 跳过 pose {pose}: 三种文件都缺失")
            continue
        columns.append(col)

    if not columns:
        print("[ERROR] 没有任何可用列，检查路径是否正确")
        sys.exit(2)

    total_w = sum(c.size[0] for c in columns) + PADDING * (len(columns) - 1)
    max_h = max(c.size[1] for c in columns)
    canvas = Image.new("RGBA", (total_w, max_h), (255, 255, 255, 255))

    x = 0
    for c in columns:
        canvas.paste(c, (x, 0))
        x += c.size[0] + PADDING

    out_path.parent.mkdir(parents=True, exist_ok=True)
    canvas.convert("RGB").save(out_path, "PNG")
    print(f"[OK] 已保存: {out_path.resolve()}")

if __name__ == "__main__":
    main()