"""
插件状态持久化模块
管理插件的启用/禁用状态，与 plugin.json 的 enabled 字段独立。
"""

import json
import logging
from pathlib import Path
from datetime import datetime
from typing import Optional

from app.plugins.models import PluginStateStore, PluginStateEntry

logger = logging.getLogger(__name__)


class PluginStateStoreManager:
    """插件状态文件管理器

    事实源：data/plugin_state.json
    以插件名为 key 保存用户启停状态。
    """

    def __init__(self, state_file_path: Path):
        """初始化状态文件管理器

        Args:
            state_file_path: 状态文件路径
        """
        self.state_file_path = state_file_path
        self._store: Optional[PluginStateStore] = None

    def _load_store(self) -> PluginStateStore:
        """加载状态文件

        如果文件不存在，返回空的 store。
        """
        if self._store is not None:
            return self._store

        if not self.state_file_path.exists():
            logger.info(f"状态文件不存在，创建新的: {self.state_file_path}")
            self._store = PluginStateStore()
            return self._store

        try:
            with open(self.state_file_path, "r", encoding="utf-8") as f:
                data = json.load(f)
                self._store = PluginStateStore(**data)
                logger.info(f"加载状态文件: {len(self._store.plugins)} 个插件")
                return self._store
        except Exception as e:
            logger.error(f"加载状态文件失败: {e}")
            self._store = PluginStateStore()
            return self._store

    def _save_store(self) -> bool:
        """保存状态文件"""
        if self._store is None:
            return False

        try:
            # 确保目录存在
            self.state_file_path.parent.mkdir(parents=True, exist_ok=True)

            # 序列化为 JSON
            data = self._store.model_dump(mode="json")

            with open(self.state_file_path, "w", encoding="utf-8") as f:
                json.dump(data, f, ensure_ascii=False, indent=2, default=str)

            logger.debug(f"保存状态文件: {self.state_file_path}")
            return True
        except Exception as e:
            logger.error(f"保存状态文件失败: {e}")
            return False

    def is_enabled(self, plugin_name: str) -> Optional[bool]:
        """检查插件是否启用

        Args:
            plugin_name: 插件名

        Returns:
            True/False 表示状态，None 表示没有记录
        """
        store = self._load_store()
        entry = store.plugins.get(plugin_name)
        if entry is None:
            return None
        return entry.enabled

    def set_enabled(
        self, plugin_name: str, enabled: bool, updated_by: str = "user"
    ) -> bool:
        """设置插件启用状态

        Args:
            plugin_name: 插件名
            enabled: 是否启用
            updated_by: 更新者

        Returns:
            是否成功
        """
        store = self._load_store()

        store.plugins[plugin_name] = PluginStateEntry(
            enabled=enabled,
            updated_at=datetime.now(),
            updated_by=updated_by,
        )

        return self._save_store()

    def remove_plugin(self, plugin_name: str) -> bool:
        """移除插件状态记录

        Args:
            plugin_name: 插件名

        Returns:
            是否成功
        """
        store = self._load_store()

        if plugin_name in store.plugins:
            del store.plugins[plugin_name]
            return self._save_store()

        return True

    def get_all_states(self) -> dict:
        """获取所有插件状态

        Returns:
            {plugin_name: enabled} 字典
        """
        store = self._load_store()
        return {name: entry.enabled for name, entry in store.plugins.items()}

    def initialize_from_metadata(
        self, plugin_name: str, default_enabled: bool = False
    ) -> bool:
        """从 plugin.json 初始化状态（首次扫描时）

        如果状态文件中已有记录，不覆盖。

        Args:
            plugin_name: 插件名
            default_enabled: 默认启用状态（来自 plugin.json）

        Returns:
            是否新增了记录
        """
        store = self._load_store()

        if plugin_name in store.plugins:
            # 已有记录，不覆盖
            return False

        # 新增记录
        store.plugins[plugin_name] = PluginStateEntry(
            enabled=default_enabled,
            updated_at=datetime.now(),
            updated_by="system",
        )

        self._save_store()
        return True


# 全局实例（延迟初始化）
_state_store_manager: Optional[PluginStateStoreManager] = None


def get_state_store_manager(state_file_path: Optional[Path] = None) -> PluginStateStoreManager:
    """获取状态文件管理器实例

    Args:
        state_file_path: 状态文件路径（首次调用时必须提供）

    Returns:
        PluginStateStoreManager 实例
    """
    global _state_store_manager

    if _state_store_manager is None:
        if state_file_path is None:
            raise ValueError("首次调用必须提供 state_file_path")
        _state_store_manager = PluginStateStoreManager(state_file_path)

    return _state_store_manager