import torch
import logging

# Import centralized logging setup
try:
    from ..utils.debug_utils import setup_logging
    setup_logging()
except ImportError:
    logging.basicConfig(level=logging.INFO)

logger = logging.getLogger(__name__)

# Import debug utilities and batch processing
try:
    from ..utils.debug_utils import debug_log, format_tensor_info
    from ..utils.batch_utils import validate_4d_batch, log_batch_processing
except ImportError:
    # Fallback if utils not available
    def debug_log(logger, level, simple_msg, verbose_msg=None, **kwargs):
        getattr(logger, level.lower())(simple_msg)
    def format_tensor_info(tensor_shape, tensor_dtype, name=""):
        return f"{name} shape={tensor_shape}" if name else f"shape={tensor_shape}"
    def validate_4d_batch(tensor, name="input"):
        return tensor.shape
    def log_batch_processing(tensor, operation, name="tensor"):
        pass

class ZNormalizeNode:
    @classmethod
    def INPUT_TYPES(cls):
        return {
            "required": {
                "image": ("IMAGE",),  # Changed to accept IMAGE tensor
                "min_depth": ("FLOAT", {
                    "default": 0.0, 
                    "min": -10000.0,
                    "max": 10000.0,
                    "step": 0.01,
                    "description": "Minimum depth value for normalization"
                }),
                "max_depth": ("FLOAT", {
                    "default": 1.0,
                    "min": -10000.0,
                    "max": 10000.0,
                    "step": 0.01,
                    "description": "Maximum depth value for normalization"
                }),
            }
        }

    RETURN_TYPES = ("IMAGE",)
    RETURN_NAMES = ("normalized_depth_image",)
    FUNCTION = "normalize_depth"
    CATEGORY = "COCO Tools/Processing"
    
    @classmethod
    def IS_CHANGED(cls, **kwargs):
        return float("NaN")  # Always execute

    def normalize_depth(self, image, min_depth, max_depth):
        """
        Normalize depth image tensor with full batch processing support.
        
        Args:
            image: Input tensor in [B,H,W,C] format
            min_depth: Minimum depth value for normalization
            max_depth: Maximum depth value for normalization
            
        Returns:
            Normalized tensor in [B,H,W,C] format
        """
        try:
            # Log batch processing info using utility
            log_batch_processing(image, f"Normalizing depth range=[{min_depth}, {max_depth}]", "depth")
            
            # Validate input tensor using utility
            batch_size, height, width, channels = validate_4d_batch(image, "depth image")
            
            # Validate depth range
            if max_depth <= min_depth:
                raise ValueError(f"max_depth ({max_depth}) must be greater than min_depth ({min_depth})")
            
            # Create a copy to avoid modifying the input
            normalized = image.clone()
            
            # Log input value range for debugging
            input_min, input_max = normalized.min().item(), normalized.max().item()
            debug_log(logger, "info", f"Input range: [{input_min:.6f}, {input_max:.6f}]",
                     f"Input depth values range from {input_min:.6f} to {input_max:.6f}")
            
            # Normalize depth values - this operation is automatically batch-aware
            depth_range = max_depth - min_depth
            normalized = (normalized - min_depth) / depth_range
            
            # Clip values to [0,1] range - also batch-aware
            normalized = torch.clamp(normalized, 0.0, 1.0)
            
            # Log normalized value range
            norm_min, norm_max = normalized.min().item(), normalized.max().item()
            debug_log(logger, "info", f"Normalized to: [{norm_min:.6f}, {norm_max:.6f}]",
                     f"After normalization, values range from {norm_min:.6f} to {norm_max:.6f}")
            
            # Handle single channel depth maps by replicating to RGB
            if normalized.shape[-1] == 1:
                debug_log(logger, "info", "Converting single channel to RGB",
                         "Single channel depth detected, replicating to RGB channels")
                normalized = normalized.repeat(1, 1, 1, 3)
                debug_log(logger, "info", f"RGB depth: {format_tensor_info(normalized.shape, normalized.dtype)}",
                         f"Converted to RGB: {format_tensor_info(normalized.shape, normalized.dtype)}")
            
            debug_log(logger, "info", f"Depth normalization complete: {format_tensor_info(normalized.shape, normalized.dtype)}",
                     f"Successfully normalized {batch_size} depth images with final shape {normalized.shape}")
                
            return (normalized,)

        except Exception as e:
            debug_log(logger, "error", "Depth normalization failed", f"Error normalizing depth image: {str(e)}")
            raise

# Node registration
# NODE_CLASS_MAPPINGS = {
#     "znormalize": znormalize
# }

# NODE_DISPLAY_NAME_MAPPINGS = {
#     "znormalize": "Z Normalize"
# }