import os
import sys
import argparse
from pathlib import Path
sys.path.append(str(Path(__file__).resolve().parent.parent))

import banana_pro_image

# Default template image path located under inverse_uv/template.png
DEFAULT_TEMPLATE_PATH = os.path.join(os.path.dirname(os.path.abspath(__file__)), 'template', 'template5.png')

# Default prompt for real-to-render Minecraft character generation
DEFAULT_PROMPT = """生成[图1]中角色的Minecraft形象

- 人物模型必须与minecraft的玩家模型相同，且为包含内层/外层贴图的双图层模型，不能有额外元素。材质不能高于Minecraft所支持的分辨率。模型参考[图2]

- 生成的minecraft角色的姿势与[图2]完全一致(不是笔直站立），且必须包含正面图与背面图，并排放置。

- 使用容易区分前景的纯色背景。

- 在上述约束下，尽可能完美、准确的还原[图1]中的角色，包括外貌特征、全身所有服装、各种饰品等（不包括手持物品）"""

def real2render(image_path, template_path=None, output_path=None, prompt=None, aspect_ratio="1:1", image_size="1K"):
    """
    High-level API to generate a Minecraft 3D character render from a real character photo using Nano Banana Pro.
    
    :param image_path: Path to the real character input image (Graph 1).
    :param template_path: Path to the template reference image (Graph 2, defaults to inverse_uv/template.png).
    :param output_path: Output PNG path.
    :param prompt: Custom prompt text (defaults to standard Minecraft real-to-render prompt).
    :param aspect_ratio: Image aspect ratio (default: "1:1").
    :param image_size: Image resolution (default: "1K").
    :return: Path to generated image file.
    """
    if not os.path.exists(image_path):
        raise FileNotFoundError(f"Real character image '{image_path}' does not exist.")
        
    template_file = template_path or DEFAULT_TEMPLATE_PATH
    if not os.path.exists(template_file):
        raise FileNotFoundError(f"Template image '{template_file}' does not exist.")
        
    prompt_text = prompt or DEFAULT_PROMPT
    
    print(f"[*] Real Image (Graph 1): {image_path}")
    print(f"[*] Template Image (Graph 2): {template_file}")
    print(f"[*] Image Size: {image_size}, Aspect Ratio: {aspect_ratio}")
    print(f"[*] Prompt:\n{prompt_text}\n")
    
    output_file = banana_pro_image.generate_img2img(
        local_image_paths=[image_path, template_file],
        prompt=prompt_text,
        output_path=output_path,
        aspect_ratio=aspect_ratio,
        image_size=image_size
    )
    return output_file

def main():
    parser = argparse.ArgumentParser(description="Convert real character photo to Minecraft render using Nano Banana Pro.")
    parser.add_argument("image", help="Path to local real character photo (Graph 1).")
    parser.add_argument("-t", "--template", default=DEFAULT_TEMPLATE_PATH, help="Path to reference template image (Graph 2).")
    parser.add_argument("-o", "--output", help="Output path for the generated image.")
    parser.add_argument("-p", "--prompt", default=DEFAULT_PROMPT, help="Prompt for image generation.")
    parser.add_argument("-a", "--aspect-ratio", default="1:1", 
                        choices=["1:1", "2:3", "3:2", "3:4", "4:3", "4:5", "5:4", "9:16", "16:9", "21:9"], 
                        help="Aspect ratio (default: 1:1).")
    parser.add_argument("-s", "--image-size", default="1K", choices=["1K", "2K", "4K"], help="Resolution size (default: 1K).")
    args = parser.parse_args()

    try:
        output_file = real2render(
            image_path=args.image,
            template_path=args.template,
            output_path=args.output,
            prompt=args.prompt,
            aspect_ratio=args.aspect_ratio,
            image_size=args.image_size
        )
        print(f"[+] Task completed successfully. Output saved to: {output_file}")
    except Exception as e:
        print(f"[!] Execution failed: {e}")
        sys.exit(1)

if __name__ == '__main__':
    main()