# file_utils.py - File handling utilities

import os
import json
from typing import Tuple, Optional

class FileHandler:
    """Class for handling uploaded files"""
    
    @staticmethod
    def read_uploaded_file(file_input, filename_for_error: str = "file") -> Tuple[Optional[str], Optional[str]]:
        """
        Universal method for reading uploaded files from different Gradio versions
        
        Returns:
            Tuple[content, error_message] - content if successful, error_message if error
        """
        if file_input is None:
            return None, f"❌ File {filename_for_error} not uploaded"
        
        # Debug information
        debug_enabled = os.getenv("LOG_PROMPTS", "false").lower() == "true"
        if debug_enabled:
            print(f"🔍 Debug {filename_for_error}: type={type(file_input)}, value={repr(file_input)[:100]}...")
        
        try:
            # Try 1: filepath (type="filepath")  
            if isinstance(file_input, str):
                if debug_enabled:
                    print(f"📁 Reading as filepath: {file_input}")
                with open(file_input, 'r', encoding='utf-8') as f:
                    return f.read(), None
            
            # Try 2: file-like object with read method
            elif hasattr(file_input, 'read'):
                if debug_enabled:
                    print(f"📄 Reading as file-like object")
                content = file_input.read()
                if isinstance(content, bytes):
                    content = content.decode('utf-8')
                return content, None
            
            # Try 3: bytes object
            elif isinstance(file_input, bytes):
                if debug_enabled:
                    print(f"🔢 Читаємо як bytes object")
                return file_input.decode('utf-8'), None
            
            # Try 4: dict with path (some Gradio versions)
            elif isinstance(file_input, dict) and 'name' in file_input:
                if debug_enabled:
                    print(f"📚 Читаємо як dict з name: {file_input['name']}")
                with open(file_input['name'], 'r', encoding='utf-8') as f:
                    return f.read(), None
            
            # Try 5: dict with other keys
            elif isinstance(file_input, dict):
                if debug_enabled:
                    print(f"📖 Dict keys: {list(file_input.keys())}")
                for key in ['path', 'file', 'filepath', 'tmp_file']:
                    if key in file_input:
                        with open(file_input[key], 'r', encoding='utf-8') as f:
                            return f.read(), None
                return None, f"❌ Не знайдено шлях до файлу в dict для {filename_for_error}"
                    
            else:
                return None, f"❌ Непідтримуваний тип файлу для {filename_for_error}: {type(file_input)}"
                
        except Exception as e:
            if debug_enabled:
                import traceback
                print(f"❌ Exception при читанні {filename_for_error}: {traceback.format_exc()}")
            return None, f"❌ Помилка читання {filename_for_error}: {str(e)}"
    
    @staticmethod
    def parse_json_file(content: str, filename: str) -> Tuple[Optional[dict], Optional[str]]:
        """
        Парсить JSON контент з обробкою помилок
        
        Returns:
            Tuple[parsed_data, error_message]
        """
        try:
            return json.loads(content), None
        except json.JSONDecodeError as e:
            return None, f"❌ Помилка парсингу {filename}: {str(e)}"