import os
import json
import logging
from abc import ABC, abstractmethod

class OutputHandler(ABC):
    """Abstract base class for handling the output of the generation pipeline."""

    @abstractmethod
    def handle_topic_results(self, run_id: str, topics_list: list, system_prompt: str, user_prompt: str):
        """Handles the results from the topic generation step."""
        pass

    @abstractmethod
    def handle_content_variant(self, run_id: str, topic_index: int, variant_index: int, content_data: dict, prompt_data: str):
        """Handles the results for a single content variant."""
        pass
        
    @abstractmethod
    def handle_poster_configs(self, run_id: str, topic_index: int, config_data: list | dict):
        """Handles the poster configuration generated for a topic."""
        pass

    @abstractmethod
    def handle_generated_image(self, run_id: str, topic_index: int, variant_index: int, image_type: str, image_data, output_filename: str, metadata: dict = None):
        """Handles a generated image (collage or final poster).
        
        Args:
            image_type: Either 'collage' or 'poster'.
            image_data: The image data (e.g., PIL Image object or bytes).
            output_filename: The desired filename for the output (e.g., 'poster.jpg').
            metadata: Optional dictionary with additional metadata about the image (e.g., used image files).
        """
        pass
        
    @abstractmethod
    def finalize(self, run_id: str):
        """Perform any final actions for the run (e.g., close files, upload manifests)."""
        pass


class FileSystemOutputHandler(OutputHandler):
    """Handles output by saving results to the local file system."""

    def __init__(self, base_output_dir: str = "result"):
        self.base_output_dir = base_output_dir
        logging.info(f"FileSystemOutputHandler initialized. Base output directory: {self.base_output_dir}")

    def _get_run_dir(self, run_id: str) -> str:
        """Gets the specific directory for a run, creating it if necessary."""
        run_dir = os.path.join(self.base_output_dir, run_id)
        os.makedirs(run_dir, exist_ok=True)
        return run_dir
        
    def _get_variant_dir(self, run_id: str, topic_index: int, variant_index: int, subdir: str | None = None) -> str:
        """Gets the specific directory for a variant, optionally within a subdirectory (e.g., 'poster'), creating it if necessary."""
        run_dir = self._get_run_dir(run_id)
        variant_base_dir = os.path.join(run_dir, f"{topic_index}_{variant_index}")
        target_dir = variant_base_dir
        if subdir:
            target_dir = os.path.join(variant_base_dir, subdir)
        os.makedirs(target_dir, exist_ok=True)
        return target_dir

    def handle_topic_results(self, run_id: str, topics_list: list, system_prompt: str, user_prompt: str):
        run_dir = self._get_run_dir(run_id)
        
        # Save topics list
        topics_path = os.path.join(run_dir, f"tweet_topic_{run_id}.json")
        try:
            with open(topics_path, "w", encoding="utf-8") as f:
                json.dump(topics_list, f, ensure_ascii=False, indent=4)
            logging.info(f"Topics list saved successfully to: {topics_path}")
        except Exception as e:
            logging.exception(f"Error saving topic JSON file to {topics_path}:")
            
        # Save prompts
        prompt_path = os.path.join(run_dir, f"topic_prompt_{run_id}.txt")
        try:
            with open(prompt_path, "w", encoding="utf-8") as f:
                f.write("--- SYSTEM PROMPT ---\n")
                f.write(system_prompt + "\n\n")
                f.write("--- USER PROMPT ---\n")
                f.write(user_prompt + "\n")
            logging.info(f"Topic prompts saved successfully to: {prompt_path}")
        except Exception as e:
            logging.exception(f"Error saving topic prompts file to {prompt_path}:")

    def handle_content_variant(self, run_id: str, topic_index: int, variant_index: int, content_data: dict, prompt_data: str):
        """Saves content JSON and prompt for a specific variant."""
        variant_dir = self._get_variant_dir(run_id, topic_index, variant_index)
        
        # Save content JSON
        content_path = os.path.join(variant_dir, "article.json")
        try:
            with open(content_path, "w", encoding="utf-8") as f:
                json.dump(content_data, f, ensure_ascii=False, indent=4)
            logging.info(f"Content JSON saved to: {content_path}")
        except Exception as e:
            logging.exception(f"Failed to save content JSON to {content_path}: {e}")
            
        # Save content prompt
        prompt_path = os.path.join(variant_dir, "tweet_prompt.txt")
        try:
            with open(prompt_path, "w", encoding="utf-8") as f:
                 # Assuming prompt_data is the user prompt used for this variant
                f.write(prompt_data + "\n")
            logging.info(f"Content prompt saved to: {prompt_path}")
        except Exception as e:
             logging.exception(f"Failed to save content prompt to {prompt_path}: {e}")

    def handle_poster_configs(self, run_id: str, topic_index: int, config_data: list | dict):
        """Saves the complete poster configuration list/dict for a topic."""
        run_dir = self._get_run_dir(run_id)
        config_path = os.path.join(run_dir, f"topic_{topic_index}_poster_configs.json")
        try:
            with open(config_path, 'w', encoding='utf-8') as f_cfg_topic:
                 json.dump(config_data, f_cfg_topic, ensure_ascii=False, indent=4)
            logging.info(f"Saved complete poster configurations for topic {topic_index} to: {config_path}")
        except Exception as save_err:
            logging.error(f"Failed to save complete poster configurations for topic {topic_index} to {config_path}: {save_err}")
            
    def handle_generated_image(self, run_id: str, topic_index: int, variant_index: int, image_type: str, image_data, output_filename: str, metadata: dict = None):
        """Saves a generated image (PIL Image) to the appropriate variant subdirectory."""
        subdir = None
        if image_type == 'collage':
            subdir = 'collage_img' # TODO: Make these subdir names configurable?
        elif image_type == 'poster':
            subdir = 'poster'
        else:
            logging.warning(f"Unknown image type '{image_type}'. Saving to variant root.")
            subdir = None # Save directly in variant dir if type is unknown

        target_dir = self._get_variant_dir(run_id, topic_index, variant_index, subdir=subdir)
        save_path = os.path.join(target_dir, output_filename)
        
        try:
            # 保存图片
            # Assuming image_data is a PIL Image object based on posterGen/simple_collage
            image_data.save(save_path)
            logging.info(f"Saved {image_type} image to: {save_path}")
            
            # 保存元数据（如果有）
            if metadata:
                metadata_filename = os.path.splitext(output_filename)[0] + "_metadata.json"
                metadata_path = os.path.join(target_dir, metadata_filename)
                try:
                    with open(metadata_path, 'w', encoding='utf-8') as f:
                        json.dump(metadata, f, ensure_ascii=False, indent=4)
                    logging.info(f"Saved {image_type} metadata to: {metadata_path}")
                except Exception as me:
                    logging.error(f"Failed to save {image_type} metadata to {metadata_path}: {me}")
                    
        except Exception as e:
            logging.exception(f"Failed to save {image_type} image to {save_path}: {e}")

    def finalize(self, run_id: str):
        logging.info(f"FileSystemOutputHandler finalizing run: {run_id}. No specific actions needed.")
        pass # Nothing specific to do for file system finalize