from datetime import datetime
import json
import os
import pytz
import traceback

class UserHistoryManager:
    def __init__(self):
        """初始化歷史紀錄管理器"""
        self.history_file = "user_history.json"
        print(f"Initializing UserHistoryManager with file: {os.path.abspath(self.history_file)}")
        self._init_file()

    def _init_file(self):
        """初始化JSON檔案"""
        try:
            if not os.path.exists(self.history_file):
                print(f"Creating new history file: {self.history_file}")
                with open(self.history_file, 'w', encoding='utf-8') as f:
                    json.dump([], f)
            else:
                print(f"History file exists: {self.history_file}")
                # 驗證檔案內容
                with open(self.history_file, 'r', encoding='utf-8') as f:
                    data = json.load(f)
                    print(f"Current history entries: {len(data)}")
        except Exception as e:
            print(f"Error in _init_file: {str(e)}")
            print(traceback.format_exc())

    def save_history(self, user_preferences: dict = None, results: list = None, search_type: str = "criteria", description: str = None) -> bool:
        """
        儲存搜尋歷史，支援兩種類型的搜尋
        Args:
            user_preferences: dict, 使用者偏好設定 (用於 criteria 搜尋)
            results: list, 推薦結果
            search_type: str, 搜尋類型 ("criteria" 或 "description")
            description: str, 使用者輸入的描述 (用於 description 搜尋)
        """
        try:
            taipei_tz = pytz.timezone('Asia/Taipei')
            taipei_time = datetime.now(taipei_tz)
            
            history_entry = {
                "timestamp": taipei_time.strftime("%Y-%m-%d %H:%M:%S"),
                "search_type": search_type,
                "results": results
            }
            
            # 根據搜尋類型添加不同的資訊
            if search_type == "criteria":
                history_entry["preferences"] = user_preferences
            else:  # description
                history_entry["description"] = description
                
            with open(self.history_file, 'r', encoding='utf-8') as f:
                history = json.load(f)
                
            history.append(history_entry)
            if len(history) > 20:
                history = history[-20:]
                
            with open(self.history_file, 'w', encoding='utf-8') as f:
                json.dump(history, f, ensure_ascii=False, indent=2)
                
            return True
        except Exception as e:
            print(f"Error saving history: {str(e)}")
            return False

    def get_history(self) -> list:
        """獲取搜尋歷史"""
        try:
            print("Attempting to read history")  # Debug
            with open(self.history_file, 'r', encoding='utf-8') as f:
                data = json.load(f)
                print(f"Read {len(data)} history entries")  # Debug
                return data if isinstance(data, list) else []
        except Exception as e:
            print(f"Error reading history: {str(e)}")
            print(traceback.format_exc())
            return []

    def clear_all_history(self) -> bool:
        """清除所有歷史紀錄"""
        try:
            print("Attempting to clear all history")  # Debug
            with open(self.history_file, 'w', encoding='utf-8') as f:
                json.dump([], f)
            print("History cleared successfully")  # Debug
            return True
        except Exception as e:
            print(f"Error clearing history: {str(e)}")
            print(traceback.format_exc())
            return False