import matplotlib.pyplot as plt
from PIL import Image
import os
from pdf2image import convert_from_path

def compose_figure_1(left_pdf_path, right_img_path, output_prefix):
    if not os.path.exists(left_pdf_path):
        print(f"❌ 找不到左图 (PDF): {left_pdf_path}")
        return
    if not os.path.exists(right_img_path):
        print(f"❌ 找不到右图 (IMG): {right_img_path}")
        return

    print("正在从 PDF 提取左侧面板 (DPI=300)...")
    # 将 PDF 的第一页转换为 PIL Image
    pages = convert_from_path(left_pdf_path, dpi=300)
    img_l = pages[0]

    print("正在加载右侧面板...")
    img_r = Image.open(right_img_path)

    # 统一高度对齐 (以 1500px 为基准高度进行高质量重采样，保证 PDF 提取的清晰度)
    target_height = 1500
    aspect_l = img_l.width / img_l.height
    aspect_r = img_r.width / img_r.height
    
    new_w_l = int(target_height * aspect_l)
    new_w_r = int(target_height * aspect_r)

    img_l = img_l.resize((new_w_l, target_height), Image.Resampling.LANCZOS)
    img_r = img_r.resize((new_w_r, target_height), Image.Resampling.LANCZOS)

    # 设置画布，保持两个 Panel 的原始宽高比比例
    # 使用更大的 figsize 以容纳高分辨率图像
    fig, (ax1, ax2) = plt.subplots(
        1, 2, 
        figsize=(18, 6), 
        gridspec_kw={'width_ratios': [aspect_l, aspect_r]}
    )
    
    # 绘制 Left Panel
    ax1.imshow(img_l)
    ax1.axis('off')
    ax1.set_title("(a) Per-seed PSNR Rank Instability (BONSAI & LEGO)", 
                  fontsize=18, pad=12, loc='left', fontweight='bold')

    # 绘制 Right Panel
    ax2.imshow(img_r)
    ax2.axis('off')
    ax2.set_title("(b) Saturated Cluster: Render vs. Representation", 
                  fontsize=18, pad=12, loc='left', fontweight='bold')

    # 缩小子图间距
    plt.subplots_adjust(wspace=0.03)
    
    # 导出保存
    os.makedirs(os.path.dirname(output_prefix), exist_ok=True)
    pdf_path = f"{output_prefix}.pdf"
    png_path = f"{output_prefix}.png"
    
    print("正在保存最终拼接文件...")
    plt.savefig(pdf_path, dpi=300, bbox_inches='tight', format='pdf', transparent=True)
    plt.savefig(png_path, dpi=300, bbox_inches='tight', format='png', transparent=False)
    
    print(f"=== Figure 1 (Saturation Puzzle) 拼图合成完毕 ===")
    print(f"✅ Saved PDF: {pdf_path} (供 LaTeX 插入)")
    print(f"✅ Saved PNG: {png_path} (供快速预览)")

if __name__ == "__main__":
    # =========================================================================
    # 文件路径配置
    # =========================================================================
    LEFT_PATH  = "/root/autodl-tmp/SplatAtlas/outputs/phase5b/fig1_left_panel.pdf" 
    RIGHT_PATH = "/root/autodl-tmp/SplatAtlas/outputs/phase5b/image_1ae31e.jpg" 
    
    # 自动保存到论文的 tex figures 目录
    OUTPUT_PREFIX = "/root/autodl-tmp/SplatAtlas/tex/figures/fig1_saturation_puzzle"
    
    compose_figure_1(LEFT_PATH, RIGHT_PATH, OUTPUT_PREFIX)