"""
WebDAV 客户端工具
基于 requests 实现，兼容 Alist 等 WebDAV 服务
"""
import json
from datetime import datetime
from typing import Any

import requests
from requests.auth import HTTPBasicAuth

from app.utils.logger import logger


class WebDAVClient:
    """WebDAV 客户端，用于与 Alist 等 WebDAV 服务交互"""

    def __init__(self, url: str, username: str, password: str, path: str = "/elysia-todo/"):
        self.base_url = url.rstrip("/")
        self.username = username
        self.password = username  # Alist 使用用户名作为密码
        self.auth = HTTPBasicAuth(username, self.password)
        self.path = path if path.startswith("/") else f"/{path}"
        self._session = requests.Session()
        self._session.auth = self.auth
        self._session.timeout = 30
        self._session.headers.update({"Content-Type": "application/json"})

    @property
    def _data_url(self) -> str:
        return f"{self.base_url}{self.path}data/"

    @property
    def _backups_url(self) -> str:
        return f"{self.base_url}{self.path}backups/"

    def _url(self, filename: str) -> str:
        return f"{self._data_url}{filename}"

    def _manifest_url(self) -> str:
        return f"{self.base_url}{self.path}manifest.json"

    def test_connection(self) -> tuple[bool, str]:
        """测试 WebDAV 连接，返回 (成功, 消息)"""
        try:
            resp = self._session.request("PROPFIND", f"{self.base_url}{self.path}", headers={"Depth": "0"})
            if resp.status_code in (200, 207, 404):
                return True, "连接成功"
            return False, f"连接失败: HTTP {resp.status_code}"
        except requests.ConnectionError:
            return False, "连接失败: 无法连接到服务器"
        except requests.Timeout:
            return False, "连接超时"
        except Exception as e:
            return False, f"连接失败: {str(e)}"

    def ensure_dirs(self) -> bool:
        """确保远端目录结构存在"""
        try:
            for path in [self.path, f"{self.path}data/", f"{self.path}backups/"]:
                url = f"{self.base_url}{path}"
                self._session.request("PROPFIND", url, headers={"Depth": "0"})
                resp = self._session.request("MKCOL", url)
                if resp.status_code in (200, 201, 405, 301):
                    pass
            return True
        except Exception as e:
            logger.error(f"创建远端目录失败: {e}")
            return False

    def upload_json(self, filename: str, data: Any) -> bool:
        """上传 JSON 数据到 WebDAV"""
        try:
            url = self._url(filename) if filename != "manifest.json" else self._manifest_url()
            content = json.dumps(data, ensure_ascii=False, indent=2, default=str).encode("utf-8")
            headers = {"Content-Type": "application/json"}
            resp = self._session.put(url, data=content, headers=headers)
            if resp.status_code in (200, 201, 204):
                return True
            logger.error(f"上传 {filename} 失败: HTTP {resp.status_code}")
            return False
        except Exception as e:
            logger.error(f"上传 {filename} 异常: {e}")
            return False

    def download_json(self, filename: str) -> Any | None:
        """从 WebDAV 下载 JSON 数据"""
        try:
            url = self._url(filename) if filename != "manifest.json" else self._manifest_url()
            resp = self._session.get(url)
            if resp.status_code == 200:
                return resp.json()
            if resp.status_code == 404:
                return None
            logger.error(f"下载 {filename} 失败: HTTP {resp.status_code}")
            return None
        except Exception as e:
            logger.error(f"下载 {filename} 异常: {e}")
            return None

    def delete_file(self, filename: str) -> bool:
        """删除 WebDAV 上的文件"""
        try:
            url = self._url(filename) if filename != "manifest.json" else self._manifest_url()
            resp = self._session.delete(url)
            return resp.status_code in (200, 204, 404)
        except Exception as e:
            logger.error(f"删除 {filename} 异常: {e}")
            return False

    def backup_remote(self, timestamp: str) -> bool:
        """备份远端数据到 backups/{timestamp}/"""
        try:
            backup_path = f"{self.path}backups/{timestamp}/data/"
            backup_url = f"{self.base_url}{backup_path}"
            self._session.request("MKCOL", f"{self.base_url}{self.path}backups/")
            self._session.request("MKCOL", f"{self.base_url}{self.path}backups/{timestamp}/")
            self._session.request("MKCOL", backup_url)

            for filename in [
                "manifest.json", "user_settings.json", "categories.json",
                "tasks.json", "tags.json", "task_tags.json",
                "habit_groups.json", "habits.json", "habit_checkins.json",
                "anniversary_categories.json", "anniversaries.json",
                "goals.json", "goal_steps.json", "goal_reviews.json", "goal_tasks.json",
            ]:
                data = self.download_json(filename)
                if data is not None:
                    src_url = self._url(filename) if filename != "manifest.json" else self._manifest_url()
                    dst_url = f"{backup_url}{filename}" if filename != "manifest.json" else f"{self.base_url}{backup_path}../manifest.json"
                    content = json.dumps(data, ensure_ascii=False, indent=2, default=str).encode("utf-8")
                    self._session.put(dst_url, data=content, headers={"Content-Type": "application/json"})

            return True
        except Exception as e:
            logger.error(f"备份远端数据失败: {e}")
            return False

    def clear_remote(self) -> bool:
        """清空远端数据目录"""
        filenames = [
            "manifest.json", "user_settings.json", "categories.json",
            "tasks.json", "tags.json", "task_tags.json",
            "habit_groups.json", "habits.json", "habit_checkins.json",
            "anniversary_categories.json", "anniversaries.json",
            "goals.json", "goal_steps.json", "goal_reviews.json", "goal_tasks.json",
        ]
        for f in filenames:
            self.delete_file(f)
        return True