import sqlite3
import pandas as pd
from contextlib import contextmanager
from dataclasses import dataclass
from typing import List, Optional

@dataclass
class AccountData:
    email: str  # 邮箱
    original_password: str  # 原密码
    original_aux_email: str  # 原辅助邮箱
    new_password: str  # 新密码
    new_aux_email: str  # 新辅助邮箱
    change_status: str  # 是否更改完成
    proxy: str  # 代理
    region: Optional[str] = None  # 区域（可选）

class AccountManagerSQLite:
    def __init__(self, db_path="accounts.db", debug=False):
        self.db_path = db_path
        self.debug = debug
        self._initialize_db()

    def debug_print(self, *args):
        """仅在 debug 模式下输出调试信息"""
        if self.debug:
            print(*args)

    def _initialize_db(self):
        """初始化或检查数据库结构"""
        with self._get_connection() as conn:
            # 启用 WAL 模式
            current_mode = conn.execute("PRAGMA journal_mode").fetchone()[0]
            if current_mode != "wal":
                self.debug_print("切换到 WAL 模式...")
                conn.execute("PRAGMA journal_mode=WAL")

            # 检查表是否存在
            cursor = conn.execute("PRAGMA table_info(accounts)")
            columns = [row[1] for row in cursor.fetchall()]
            
            # 定义表结构
            required_columns = [
                "email", "original_password", "original_aux_email",
                "new_password", "new_aux_email", "change_status", "proxy", "region"
            ]
            
            if not columns:  # 表不存在
                self.debug_print("表不存在，正在创建表...")
            elif columns != required_columns:  # 表存在但结构不一致
                self.debug_print(f"表结构不一致，当前列: {columns}, 期望列: {required_columns}")
                self.debug_print("正在重建表...")
                conn.execute("DROP TABLE IF EXISTS accounts")
            else:  # 表存在且结构一致
                self.debug_print("表结构检查通过，无需更改。")
                return

            # 创建表
            conn.execute("""
                CREATE TABLE accounts (
                    email TEXT PRIMARY KEY,
                    original_password TEXT,
                    original_aux_email TEXT,
                    new_password TEXT,
                    new_aux_email TEXT,
                    change_status TEXT,
                    proxy TEXT,
                    region TEXT
                )
            """)
            self.debug_print("表已创建。")

    @contextmanager
    def _get_connection(self):
        """获取 SQLite 数据库连接"""
        conn = sqlite3.connect(self.db_path)
        try:
            yield conn
        finally:
            conn.close()

    def clear(self):
        """清空数据库中的所有数据"""
        with self._get_connection() as conn:
            try:
                conn.execute("DELETE FROM accounts")
                conn.commit()
                self.debug_print("数据库已清空。")
            except sqlite3.Error as e:
                conn.rollback()
                self.debug_print(f"清空数据库失败：{e}")
                raise

    def import_data(self, account_list: List[AccountData]):
        """批量导入数据"""
        with self._get_connection() as conn:
            try:
                conn.executemany("""
                    INSERT OR REPLACE INTO accounts (
                        email, original_password, original_aux_email, 
                        new_password, new_aux_email, change_status, proxy, region
                    ) VALUES (?, ?, ?, ?, ?, ?, ?, ?)
                """, [
                    (
                        account.email, account.original_password, account.original_aux_email,
                        account.new_password, account.new_aux_email, account.change_status,
                        account.proxy, account.region
                    ) for account in account_list
                ])
                conn.commit()
                self.debug_print(f"成功导入 {len(account_list)} 条数据！")
            except sqlite3.Error as e:
                conn.rollback()
                self.debug_print(f"Error importing data: {e}")
                raise

    def export_data(self) -> List[AccountData]:
        """导出所有数据"""
        with self._get_connection() as conn:
            cursor = conn.execute("SELECT * FROM accounts")
            rows = cursor.fetchall()
            return [AccountData(*row) for row in rows]

    def query(self, **kwargs) -> List[AccountData]:
        """查询数据"""
        query = "SELECT * FROM accounts WHERE " + " AND ".join([f"{key} = ?" for key in kwargs])
        values = tuple(kwargs.values())

        with self._get_connection() as conn:
            cursor = conn.execute(query, values)
            rows = cursor.fetchall()
            return [AccountData(*row) for row in rows]

    def update_record(self, email: str, **kwargs):
        """更新记录的指定字段"""
        if not kwargs:
            raise ValueError("没有指定任何更新的字段")

        # 动态生成 SQL 的 SET 子句
        set_clause = ", ".join([f"{key} = ?" for key in kwargs.keys()])
        values = list(kwargs.values())
        values.append(email)  # 将 email 添加到参数列表的最后

        query = f"""
            UPDATE accounts
            SET {set_clause}
            WHERE email = ?
        """

        with self._get_connection() as conn:
            try:
                conn.execute(query, values)
                conn.commit()
                self.debug_print(f"成功更新记录: {email}")
            except sqlite3.Error as e:
                conn.rollback()
                self.debug_print(f"更新记录失败：{e}")
                raise

    def delete_account(self, email: str):
        """删除某个账户"""
        with self._get_connection() as conn:
            try:
                conn.execute("DELETE FROM accounts WHERE email = ?", (email,))
                conn.commit()
                self.debug_print(f"成功删除账户: {email}")
            except sqlite3.Error as e:
                conn.rollback()
                self.debug_print(f"Error deleting account: {e}")
                raise

    def import_from_excel(self, excel_path: str, clear_old: bool = False):
        """从 Excel 文件导入数据"""
        try:
            if clear_old:
                self.clear()

            # 读取 Excel 文件
            df = pd.read_excel(excel_path, sheet_name=0)

            # 校验表格格式
            required_columns = [
                "邮箱", "原密码", "原辅助邮箱", "新密码", "新辅助邮箱", "是否更改完成", "代理"
            ]
            optional_columns = ["区域"]
            all_columns = required_columns + optional_columns

            missing_columns = [col for col in required_columns if col not in df.columns]
            if missing_columns:
                raise ValueError(f"表格缺少必要的列：{missing_columns}")

            # 添加缺失的可选列并填充默认值
            for col in optional_columns:
                if col not in df.columns:
                    df[col] = None

            # 转换数据为 AccountData 对象
            account_list = [
                AccountData(
                    email=row["邮箱"],
                    original_password=row["原密码"],
                    original_aux_email=row["原辅助邮箱"],
                    new_password=row["新密码"],
                    new_aux_email=row["新辅助邮箱"],
                    change_status=row["是否更改完成"],
                    proxy=row["代理"],
                    region=row.get("区域", None)
                )
                for _, row in df.iterrows()
            ]

            self.import_data(account_list)
        except Exception as e:
            self.debug_print(f"导入失败：{e}")
            raise

    def export_to_excel(self, excel_path: str):
        """导出数据到 Excel 文件"""
        try:
            accounts = self.export_data()
            df = pd.DataFrame([{
                "邮箱": account.email,
                "原密码": account.original_password,
                "原辅助邮箱": account.original_aux_email,
                "新密码": account.new_password,
                "新辅助邮箱": account.new_aux_email,
                "是否更改完成": account.change_status,
                "代理": account.proxy,
                "区域": account.region
            } for account in accounts])

            df.to_excel(excel_path, index=False, sheet_name="Accounts")
            self.debug_print(f"成功导出数据到 {excel_path}！")
        except Exception as e:
            self.debug_print(f"导出失败：{e}")
            raise