"""
Oculus Processor

Handles image and text preprocessing for the Oculus model.
"""

from typing import Optional, Union, List, Dict, Any
from PIL import Image
import numpy as np

from transformers import ProcessorMixin, BatchFeature
from transformers.image_utils import ImageInput


class OculusProcessor(ProcessorMixin):
    """
    Processor for Oculus model.
    
    Combines image processing and text tokenization.
    
    Usage:
        ```python
        processor = OculusProcessor.from_pretrained("OceanirAI/oculus-0.2")
        
        # Process inputs
        inputs = processor(
            images=image,
            text="What is in this image?",
            mode="text",
            return_tensors="pt"
        )
        ```
    """
    
    attributes = ["image_processor", "tokenizer"]
    image_processor_class = "AutoImageProcessor"
    tokenizer_class = "AutoTokenizer"
    
    def __init__(
        self,
        image_processor=None,
        tokenizer=None,
        **kwargs
    ):
        super().__init__(image_processor, tokenizer)
        self.image_processor = image_processor
        self.tokenizer = tokenizer
        
        # Special tokens
        self.thinking_token = kwargs.get("thinking_token", "<think>")
        self.thinking_end_token = kwargs.get("thinking_end_token", "</think>")
        self.focus_token = kwargs.get("focus_token", "<focus>")
        self.focus_end_token = kwargs.get("focus_end_token", "</focus>")
        
        # Output mode tokens
        self.mode_tokens = {
            "text": "<text>",
            "point": "<point>",
            "box": "<box>",
            "polygon": "<polygon>",
        }
    
    def __call__(
        self,
        images: ImageInput = None,
        text: Union[str, List[str]] = None,
        mode: str = "text",
        think: bool = False,
        return_tensors: Optional[str] = None,
        **kwargs
    ) -> BatchFeature:
        """
        Process images and text for Oculus model.
        
        Args:
            images: Input image(s)
            text: Input text prompt(s)
            mode: Output mode ("text", "point", "box", "polygon")
            think: Enable reasoning mode
            return_tensors: Tensor format ("pt", "np", etc.)
            
        Returns:
            BatchFeature with processed inputs
        """
        # Process images
        if images is not None:
            if self.image_processor is not None:
                image_features = self.image_processor(images, return_tensors=return_tensors)
            else:
                # Basic processing
                if isinstance(images, Image.Image):
                    images = [images]
                image_features = {"pixel_values": images}
        else:
            image_features = {}
        
        # Process text
        if text is not None:
            # Add mode and thinking tokens
            processed_text = self._format_prompt(text, mode, think)
            
            if self.tokenizer is not None:
                text_features = self.tokenizer(
                    processed_text,
                    return_tensors=return_tensors,
                    padding=True,
                    truncation=True,
                    **kwargs
                )
            else:
                text_features = {"text": processed_text}
        else:
            text_features = {}
        
        # Combine features
        return BatchFeature(
            data={
                **image_features,
                **text_features,
                "mode": mode,
                "think": think,
            },
            tensor_type=return_tensors
        )
    
    def _format_prompt(
        self,
        text: Union[str, List[str]],
        mode: str,
        think: bool
    ) -> Union[str, List[str]]:
        """Format prompt with special tokens."""
        
        def format_single(t: str) -> str:
            parts = []
            
            # Add mode token
            if mode in self.mode_tokens:
                parts.append(self.mode_tokens[mode])
            
            # Add thinking token if enabled
            if think:
                parts.append(self.thinking_token)
            
            # Add prompt
            parts.append(t)
            
            return " ".join(parts)
        
        if isinstance(text, str):
            return format_single(text)
        else:
            return [format_single(t) for t in text]
    
    def decode(
        self,
        token_ids,
        skip_special_tokens: bool = True,
        **kwargs
    ) -> str:
        """Decode token IDs to text."""
        if self.tokenizer is not None:
            text = self.tokenizer.decode(token_ids, skip_special_tokens=skip_special_tokens, **kwargs)
        else:
            text = str(token_ids)
        
        # Parse thinking trace if present
        thinking_trace = None
        if self.thinking_token in text and self.thinking_end_token in text:
            start = text.find(self.thinking_token) + len(self.thinking_token)
            end = text.find(self.thinking_end_token)
            thinking_trace = text[start:end].strip()
            text = text[end + len(self.thinking_end_token):].strip()
        
        return text, thinking_trace
    
    def batch_decode(
        self,
        token_ids,
        skip_special_tokens: bool = True,
        **kwargs
    ) -> List[str]:
        """Decode batch of token IDs."""
        return [
            self.decode(ids, skip_special_tokens=skip_special_tokens, **kwargs)
            for ids in token_ids
        ]
    
    @classmethod
    def from_pretrained(cls, pretrained_model_name_or_path: str, **kwargs):
        """Load processor from pretrained."""
        try:
            from transformers import AutoImageProcessor, AutoTokenizer
            
            image_processor = AutoImageProcessor.from_pretrained(
                pretrained_model_name_or_path, **kwargs
            )
            tokenizer = AutoTokenizer.from_pretrained(
                pretrained_model_name_or_path, **kwargs
            )
            return cls(image_processor=image_processor, tokenizer=tokenizer, **kwargs)
        except:
            # Return basic processor without HF components
            return cls(**kwargs)
    
    def save_pretrained(self, save_directory: str, **kwargs):
        """Save processor to directory."""
        if self.image_processor is not None:
            self.image_processor.save_pretrained(save_directory)
        if self.tokenizer is not None:
            self.tokenizer.save_pretrained(save_directory)