import cv2
import numpy as np
import torch
from PIL import Image

NODE_NAME = 'TTPlanet_Tile_Preprocessor'

# 图像转换函数
def pil2tensor(image: Image) -> torch.Tensor:
    return torch.from_numpy(np.array(image).astype(np.float32) / 255.0).unsqueeze(0)
        
def tensor2pil(t_image: torch.Tensor) -> Image:
    return Image.fromarray(np.clip(255.0 * t_image.cpu().numpy().squeeze(), 0, 255).astype(np.uint8))

class TTPlanet_Tile_Preprocessor:
    def __init__(self):
        pass

    @classmethod
    def INPUT_TYPES(cls):
        return {
            "required": {
                "image": ("IMAGE",),  # 输入的tensor图像
                "scale_factor": ("FLOAT", {"default": 2.0, "min": 1.0, "max": 8.0, "step": 0.1}),  # 缩放因子
            },
            "optional": {}
        }

    RETURN_TYPES = ("IMAGE",)
    RETURN_NAMES = ("image_output",)
    FUNCTION = 'process_image'
    CATEGORY = 'TTP_TILE'

    def process_image(self, image, scale_factor):
        ret_images = []
    
        for i in image:
            # Convert tensor to PIL for processing
            _canvas = tensor2pil(torch.unsqueeze(i, 0)).convert('RGB')
            
            # Convert PIL to OpenCV format
            img_np = np.array(_canvas)[:, :, ::-1]
    
            # 获取原始尺寸
            height, width = img_np.shape[:2]
    
            # 计算新尺寸
            new_width = int(width / scale_factor)
            new_height = int(height / scale_factor)
    
            # 1. 使用cv2.INTER_AREA方法缩小图像
            resized_down = cv2.resize(img_np, (new_width, new_height), interpolation=cv2.INTER_AREA)
    
            # 2. 使用linear方法放大回原尺寸
            resized_img = cv2.resize(resized_down, (width, height), interpolation=cv2.INTER_CUBIC)
            
            # Convert OpenCV back to PIL and then to tensor
            pil_img = Image.fromarray(resized_img[:, :, ::-1])
            tensor_img = pil2tensor(pil_img)
            ret_images.append(tensor_img)
        
        return (torch.cat(ret_images, dim=0),)

NODE_CLASS_MAPPINGS = {
    "Image Processing: TTPlanet_Tile_Preprocessor": TTPlanet_Tile_Preprocessor
}

NODE_DISPLAY_NAME_MAPPINGS = {
    "Image Processing: TTPlanet_Tile_Preprocessor": "TTPlanet Tile Preprocessor"
}