import json
import re
import shutil
from pathlib import Path
from typing import Union, Optional

from app.chain import ChainBase
from app.runtime.config import settings
from app.runtime.extensions.plugin_manager import PluginManager
from app.runtime.state import SystemHelper
from app.runtime.log import logger
from app.schemas import Message, NotificationChannel
from app.adapters.network.http import RequestUtils
from app.adapters.system.host import SystemUtils
from version import FRONTEND_VERSION, APP_VERSION


class SystemChain(ChainBase):
    """
    系统级处理链
    """

    _restart_file = "__system_restart__"

    def remote_clear_cache(self, channel: NotificationChannel, userid: Union[int, str], source: Optional[str] = None):
        """
        清理系统缓存
        """
        self.clear_cache()
        self.post_message(Message(
            channel=channel,
            source=source,
            title=f"缓存清理完成！",
            userid=userid,
            save_history=False))

    def restart(self, channel: NotificationChannel, userid: Union[int, str], source: Optional[str] = None):
        """
        重启系统
        """
        if channel and userid:
            self.post_message(Message(
                channel=channel,
                source=source,
                title="系统正在重启，请耐心等候！",
                userid=userid,
                save_history=False))
            # 保存重启信息
            self.save_cache({
                "channel": channel.value,
                "userid": userid
            }, self._restart_file)
        # 主动备份一次插件
        self.backup_plugins()
        # 重启
        SystemHelper.restart()

    @staticmethod
    def backup_plugins():
        """
        备份插件到用户配置目录（仅docker环境）
        """

        # 非docker环境不处理
        if not SystemUtils.is_docker():
            return

        try:
            # 使用绝对路径确保准确性
            plugins_dir = settings.ROOT_PATH / "app" / "plugins"
            backup_dir = settings.CONFIG_PATH / "plugins_backup"

            if not plugins_dir.exists():
                logger.info("插件目录不存在，跳过备份")
                return

            # 确保备份目录存在
            backup_dir.mkdir(parents=True, exist_ok=True)

            # 需要排除的文件和目录
            exclude_items = {"__init__.py", "__pycache__", ".DS_Store"}

            # 遍历插件目录，备份除排除项外的所有内容
            for item in plugins_dir.iterdir():
                if item.name in exclude_items:
                    continue

                target_path = backup_dir / item.name

                # 如果是目录
                if item.is_dir():
                    if target_path.exists():
                        continue
                    shutil.copytree(item, target_path)
                    logger.debug(f"已备份插件目录: {item.name}")
                # 如果是文件
                elif item.is_file():
                    if target_path.exists():
                        continue
                    shutil.copy2(item, target_path)
                    logger.info(f"已备份插件文件: {item.name}")

            logger.info(f"插件备份完成，备份位置: {backup_dir}")

        except Exception as e:
            logger.error(f"插件备份失败: {str(e)}")

    @staticmethod
    def restore_plugins():
        """
        从备份恢复插件到app/plugins目录，恢复完成后删除备份（仅docker环境）
        """

        # 非docker环境不处理
        if not SystemUtils.is_docker():
            return

        # 使用绝对路径确保准确性
        plugins_dir = settings.ROOT_PATH / "app" / "plugins"
        backup_dir = settings.CONFIG_PATH / "plugins_backup"

        if not backup_dir.exists():
            logger.info("插件备份目录不存在，跳过恢复")
            return

        # 系统被重置才恢复插件
        if SystemHelper().is_system_reset():

            # 确保插件目录存在
            plugins_dir.mkdir(parents=True, exist_ok=True)

            # 遍历备份目录，恢复所有内容
            restored_count = 0
            for item in backup_dir.iterdir():
                target_path = plugins_dir / item.name
                try:
                    # 如果是目录，且目录内有内容
                    if item.is_dir() and any(item.iterdir()):
                        if target_path.exists():
                            shutil.rmtree(target_path)
                        shutil.copytree(item, target_path)
                        logger.debug(f"已恢复插件目录: {item.name}")
                        restored_count += 1
                    # 如果是文件
                    elif item.is_file():
                        shutil.copy2(item, target_path)
                        logger.debug(f"已恢复插件文件: {item.name}")
                        restored_count += 1
                except Exception as e:
                    logger.error(f"恢复插件 {item.name} 时发生错误: {str(e)}")
                    continue

            logger.info(f"插件恢复完成，共恢复 {restored_count} 个项目")

            # 安装缺少的依赖
            PluginManager.install_plugin_missing_dependencies()

        # 删除备份目录
        try:
            shutil.rmtree(backup_dir)
            logger.info(f"已删除插件备份目录: {backup_dir}")
        except Exception as e:
            logger.warning(f"删除备份目录失败: {str(e)}")

    def __get_version_message(self) -> str:
        """
        获取版本信息文本
        """
        server_release_version = self.__get_server_release_version()
        front_release_version = self.__get_front_release_version()
        server_local_version = self.get_server_local_version()
        front_local_version = self.get_frontend_version()
        if server_release_version == server_local_version:
            title = f"当前后端版本：{server_local_version}，已是最新版本\n"
        else:
            title = f"当前后端版本：{server_local_version}，远程版本：{server_release_version}\n"
        if front_release_version == front_local_version:
            title += f"当前前端版本：{front_local_version}，已是最新版本"
        else:
            title += f"当前前端版本：{front_local_version}，远程版本：{front_release_version}"
        return title

    def version(self, channel: NotificationChannel, userid: Union[int, str], source: Optional[str] = None):
        """
        查看当前版本、远程版本
        """
        self.post_message(Message(
            channel=channel,
            source=source,
            title=self.__get_version_message(),
            userid=userid,
            save_history=False))

    def restart_finish(self):
        """
        如通过交互命令重启，
        重启完发送msg
        """
        # 重启消息
        restart_channel = self.load_cache(self._restart_file)
        if restart_channel:
            # 发送重启完成msg
            if not isinstance(restart_channel, dict):
                restart_channel = json.loads(restart_channel)
            channel = next(
                (channel for channel in NotificationChannel.__members__.values() if
                 channel.value == restart_channel.get('channel')), None)
            userid = restart_channel.get('userid')

            # 版本号
            title = self.__get_version_message()
            self.post_message(Message(
                channel=channel,
                title=f"系统已重启完成！\n{title}",
                userid=userid,
                save_history=False))
            self.remove_cache(self._restart_file)

    @staticmethod
    def __get_server_release_version():
        """
        获取后端V2最新版本
        """
        try:
            # 获取所有发布的版本列表
            response = RequestUtils(
                proxies=settings.PROXY,
                headers=settings.GITHUB_HEADERS
            ).get_res("https://api.github.com/repos/jxxghp/MoviePilot/releases")
            if response:
                releases = [release['tag_name'] for release in response.json()]
                v2_releases = [tag for tag in releases if re.match(r"^v2\.", tag)]
                if not v2_releases:
                    logger.warn("获取v2后端最新版本版本出错！")
                else:
                    # 找到最新的v2版本
                    latest_v2 = sorted(v2_releases, key=lambda s: list(map(int, re.findall(r'\d+', s))))[-1]
                    logger.info(f"获取到后端最新版本：{latest_v2}")
                    return latest_v2
            else:
                logger.error("无法获取后端版本信息，请检查网络连接或GitHub API请求。")
        except Exception as err:
            logger.error(f"获取后端最新版本失败：{str(err)}")
        return None

    @staticmethod
    def __get_front_release_version():
        """
        获取前端V2最新版本
        """
        try:
            # 获取所有发布的版本列表
            response = RequestUtils(
                proxies=settings.PROXY,
                headers=settings.GITHUB_HEADERS
            ).get_res("https://api.github.com/repos/jxxghp/MoviePilot-Frontend/releases")
            if response:
                releases = [release['tag_name'] for release in response.json()]
                v2_releases = [tag for tag in releases if re.match(r"^v2\.", tag)]
                if not v2_releases:
                    logger.warn("获取v2前端最新版本版本出错！")
                else:
                    # 找到最新的v2版本
                    latest_v2 = sorted(v2_releases, key=lambda s: list(map(int, re.findall(r'\d+', s))))[-1]
                    logger.info(f"获取到前端最新版本：{latest_v2}")
                    return latest_v2
            else:
                logger.error("无法获取前端版本信息，请检查网络连接或GitHub API请求。")
        except Exception as err:
            logger.error(f"获取前端最新版本失败：{str(err)}")
        return None

    @staticmethod
    def get_server_local_version():
        """
        查看当前版本
        """
        return APP_VERSION

    @staticmethod
    def get_frontend_version():
        """
        获取前端版本
        """
        if SystemUtils.is_frozen() and SystemUtils.is_windows():
            version_file = settings.CONFIG_PATH.parent / "nginx" / "html" / "version.txt"
        else:
            version_file = Path(settings.FRONTEND_PATH) / "version.txt"
        if version_file.exists():
            try:
                with open(version_file, 'r', encoding='utf-8', errors='replace') as f:
                    version = str(f.read()).strip()
                return version
            except Exception as err:
                logger.debug(f"加载版本文件 {version_file} 出错：{str(err)}")
        return FRONTEND_VERSION