"""
CloudSearch Transfer — UC网盘适配器 v1.0.0

将 UcCredentialManager、UcTransfer、UcCleanup 组合为
BaseCloudDriveAdapter 的完整实现。

UC网盘 7 步 API 转存流程（与夸克高度相似，API 域名不同）：
 ① POST .../share/sharepage/v2/detail?pr=UCBrowser&fr=pc → stoken
 ② GET  .../share/sharepage/detail                        → fid, share_fid_token, title
 ③ POST .../share/sharepage/save                          → task_id (转存)
 ④ 轮询 GET .../task                                      → save_as_top_fids
 ⑤ POST .../share                                         → task_id (创建分享)
 ⑥ 轮询 GET .../task                                      → share_id
 ⑦ POST .../share/password                                → share_url, passcode

参考 cloud-auto-save 的 quark 实现，域名从 drive-pc.quark.cn 改为 pc-api.uc.cn。
"""

from __future__ import annotations

import logging
import time
from typing import Any, Dict, List, Optional, Tuple
from urllib.parse import urlparse, parse_qs

from ..base import BaseCloudDriveAdapter, FileInfo, TransferResult, VerifyResult
from ...config import PlatformConfig, TransferConfig
from ...errors import TransferError, TransferErrorCode

from .credential import UcCredentialManager
from .transfer import UcTransfer, SHARE_URL_PATTERN
from .cleanup import UcCleanup

logger = logging.getLogger(__name__)


class UcAdapter(BaseCloudDriveAdapter):
    """UC网盘适配器。

    组合 credential / transfer / cleanup 三个模块，
    实现 BaseCloudDriveAdapter 定义的所有抽象方法。

    Attributes:
        PLATFORM_NAME: 展示用平台名称。
        PLATFORM_KEY: 内部平台标识。
        URL_PATTERNS: UC 分享链接匹配正则列表。
    """

    # ─── 平台标识 ──────────────────────────────────────────────
    PLATFORM_NAME: str = "UC网盘"
    PLATFORM_KEY: str = "uc"

    # ─── URL 匹配 ──────────────────────────────────────────────
    # 支持 drive.uc.cn/s/<share_id>
    URL_PATTERNS: List[str] = [
        r"drive\.uc\.cn/s/(\w+)",
    ]


    capabilities: Dict[str, bool] = {
        "ensure_dir": True,
        "save_files": True,
        "poll_task": True,
        "rename": True,
        "move_files": True,
        "delete_files": True,
        "cleanup_recycle": False,
        "share_staging_folder": True,
    }

    def __init__(self, config: PlatformConfig, transfer_config: TransferConfig) -> None:
        """初始化适配器。"""
        self._credential: UcCredentialManager = UcCredentialManager(cookie=config.cookie)
        self._transfer_engine: UcTransfer = UcTransfer(
            credential=self._credential,
            timeout=transfer_config.request_timeout,
            poll_interval=transfer_config.task_poll_interval,
            poll_max_attempts=transfer_config.task_poll_max_attempts,
        )
        self._cleanup: UcCleanup = UcCleanup(
            credential=self._credential,
            timeout=transfer_config.request_timeout,
        )
        super().__init__(config, transfer_config)

    # ═══════════════════════════════════════════════════════════════
    # 公开接口实现
    # ═══════════════════════════════════════════════════════════════

    def _setup_session(self) -> None:
        """将 UC Cookie 注入 session 的默认 headers。"""
        headers = self._credential.get_headers()
        if headers:
            self.session.headers.update(headers)
            logger.debug("[UcAdapter] Session headers updated with Cookie")

    def transfer(self, share_url: str, save_dir: str = "",
                 share_password: str = "") -> TransferResult:
        start: float = time.time()

        if not self._credential.validate():
            raise TransferError(
                TransferErrorCode.NOT_LOGIN,
                message="UC Cookie 无效或长度不足",
                platform=self.PLATFORM_KEY,
            )

        requested_dir: str = save_dir or self.config.save_dir or "/"
        target_dir: str = requested_dir if requested_dir and not str(requested_dir).startswith("/") else self.ensure_dir(requested_dir)
        staging_dir: str = self.get_or_create_share_folder() or target_dir
        pwd: str = share_password or self.config.share_password or ""

        try:
            pwd_id, passcode = self._parse_share_url(share_url)
            stoken: str = self._transfer_engine._get_stoken(pwd_id, passcode)
            detail: Dict[str, Any] = self._transfer_engine._get_detail(pwd_id, stoken)
            task_id: str = self._transfer_engine._init_save(
                pwd_id, stoken, detail, to_pdir_fid=staging_dir
            )
            new_fids: List[str] = self._transfer_engine._poll_save_task(task_id)
            if not new_fids:
                raise RuntimeError("转存完成但未获取到文件ID")

            if staging_dir != target_dir:
                move_result = self.move_files(new_fids, target_dir)
                if not self._api_success(move_result):
                    raise RuntimeError(f"移动到目标目录失败: {move_result.get('message', move_result)}")

            if self.transfer_config.ad_filter_enabled and new_fids:
                new_fids = self._filter_ads(new_fids)
                if not new_fids:
                    raise RuntimeError("广告过滤后无可分享文件")

            title: str = detail.get("title", "分享")
            share_task_id: str = self._transfer_engine._init_share(new_fids, title)
            share_id: str = self._transfer_engine._poll_share_task(share_task_id)
            share_url_new, passcode_new = self._transfer_engine._set_password(share_id, pwd)
        except ValueError as exc:
            raise TransferError(
                TransferErrorCode.URL_INVALID,
                message=str(exc),
                platform=self.PLATFORM_KEY,
            ) from exc
        except RuntimeError as exc:
            msg: str = str(exc)
            if "stoken" in msg or "status" in msg:
                raise TransferError(
                    TransferErrorCode.SHARE_NOT_EXIST,
                    message=msg,
                    platform=self.PLATFORM_KEY,
                ) from exc
            raise TransferError(
                TransferErrorCode.NETWORK_ERROR,
                message=msg,
                platform=self.PLATFORM_KEY,
            ) from exc

        elapsed: int = int((time.time() - start) * 1000)
        return TransferResult(
            success=True,
            platform=self.PLATFORM_KEY,
            new_file_id=",".join(new_fids),
            file_name=title,
            share_url=share_url_new,
            share_password=passcode_new,
            original_url=share_url,
            elapsed_ms=elapsed,
        )

    def verify(self, share_url: str) -> VerifyResult:
        """验证 UC 分享链接有效性。

        Args:
            share_url: UC 分享链接。

        Returns:
            VerifyResult 包含验证结果。
        """
        try:
            pwd_id, passcode = self._parse_share_url(share_url)

            if not self._credential.validate():
                return VerifyResult(
                    valid=False,
                    platform=self.PLATFORM_KEY,
                    error=TransferError(
                        TransferErrorCode.NOT_LOGIN,
                        platform=self.PLATFORM_KEY,
                    ),
                )

            stoken: str = self._transfer_engine._get_stoken(pwd_id, passcode)
            detail: Dict[str, Any] = self._transfer_engine._get_detail(pwd_id, stoken)
            files: List[FileInfo] = self._extract_file_list(detail)

            return VerifyResult(
                valid=True,
                platform=self.PLATFORM_KEY,
                title=detail.get("title", ""),
                file_count=len(files),
                files=files,
            )

        except TransferError as exc:
            return VerifyResult(valid=False, platform=self.PLATFORM_KEY, error=exc)
        except (ValueError, RuntimeError) as exc:
            return VerifyResult(
                valid=False,
                platform=self.PLATFORM_KEY,
                error=TransferError(
                    TransferErrorCode.SHARE_NOT_EXIST,
                    message=str(exc),
                    platform=self.PLATFORM_KEY,
                ),
            )
        except Exception as exc:
            return VerifyResult(
                valid=False,
                platform=self.PLATFORM_KEY,
                error=TransferError(
                    TransferErrorCode.NETWORK_ERROR,
                    message=str(exc),
                    platform=self.PLATFORM_KEY,
                ),
            )

    # ─── 核心抽象方法 ─────────────────────────────────────────

    def _get_share_detail(self, pwd_id: str, passcode: str = "") -> dict:
        """获取 UC 分享详情。

        Args:
            pwd_id: 分享 ID。
            passcode: 提取码。

        Returns:
            分享详情字典，包含 title, fid, share_fid_token 等字段。
        """
        stoken: str = self._transfer_engine._get_stoken(pwd_id, passcode)
        return self._transfer_engine._get_detail(pwd_id, stoken)

    def _save_files(self, pwd_id: str, detail: dict, save_dir: str) -> List[str]:
        """转存文件到自己的 UC 网盘。

        Args:
            pwd_id: 分享 ID。
            detail: 分享详情（来自 _get_share_detail）。
            save_dir: 目标目录 ID。

        Returns:
            转存后的新文件 ID 列表。
        """
        stoken: str = self._transfer_engine._get_stoken(pwd_id)
        task_id: str = self._transfer_engine._init_save(
            pwd_id, stoken, detail, to_pdir_fid=save_dir
        )
        return self._transfer_engine._poll_save_task(task_id)

    def _create_share(
        self, file_ids: List[str], title: str, password: str = ""
    ) -> Tuple[str, str]:
        """创建 UC 分享链接。

        Args:
            file_ids: 要分享的文件 ID 列表。
            title: 分享标题。
            password: 分享密码。

        Returns:
            (share_url, share_password) 元组。
        """
        task_id: str = self._transfer_engine._init_share(file_ids, title)
        share_id: str = self._transfer_engine._poll_share_task(task_id)
        return self._transfer_engine._set_password(share_id, password)

    def _extract_file_list(self, detail: dict) -> List[FileInfo]:
        """从 UC 分享详情中提取文件列表。

        UC 的 sharepage/detail 返回格式与夸克一致：
        {
            "files": [
                {"fid": "...", "file_name": "...", "size": 123, "dir": false, ...},
            ]
        }

        Args:
            detail: 分享详情字典。

        Returns:
            FileInfo 对象列表。
        """
        files_data: List[Dict[str, Any]] = detail.get("files", [])
        result: List[FileInfo] = []

        for f in files_data:
            file_info = FileInfo(
                fid=str(f.get("fid", f.get("file_id", ""))),
                name=str(f.get("file_name", f.get("name", ""))),
                size=int(f.get("size", 0)),
                is_dir=bool(f.get("dir", f.get("is_dir", False))),
                ext=str(f.get("ext", f.get("file_extension", ""))),
            )
            result.append(file_info)

        # 如果 files 为空，尝试用 detail 顶层字段构造单个文件信息
        if not result and detail.get("fid"):
            result.append(
                FileInfo(
                    fid=str(detail.get("fid", "")),
                    name=str(detail.get("title", detail.get("file_name", ""))),
                    size=0,
                    is_dir=False,
                )
            )

        return result

    def _filter_ads(self, file_ids: List[str]) -> List[str]:
        """过滤广告文件。

        Args:
            file_ids: 文件 ID 列表。

        Returns:
            过滤后的文件 ID 列表。
        """
        keywords: List[str] = list(
            set(self.config.banned_keywords)
            | set(self.transfer_config.default_banned_keywords)
        )
        if not keywords:
            return file_ids

        try:
            files: List[FileInfo] = self.get_files()
            file_names: List[str] = [f.name for f in files]
            return UcCleanup.filter_ad_ids(file_ids, file_names, keywords)
        except Exception:
            logger.warning(
                "[UcAdapter] Cannot fetch file list for ad filtering, skipping"
            )
            return file_ids


    # ─── Drive API capability helpers ─────────────────────────────

    @staticmethod
    def _normalize_dir_path(dir_path: str) -> str:
        path = "/" + str(dir_path or "").strip().strip("/")
        return "/" if path == "/" else path

    @staticmethod
    def _api_success(payload: Dict[str, Any]) -> bool:
        if not isinstance(payload, dict):
            return False
        code = payload.get("code")
        status = payload.get("status")
        return code == 0 or status in (0, 200)

    def ensure_dir(self, dir_path: str) -> str:
        normalized = self._normalize_dir_path(dir_path)
        if normalized == "/":
            return "0"

        parts = [part for part in normalized.strip("/").split("/") if part]
        prefixes = ["/" + "/".join(parts[:idx]) for idx in range(1, len(parts) + 1)]
        existing = {
            item.get("file_path"): str(item.get("fid"))
            for item in self.get_fids(prefixes)
            if item.get("file_path") and item.get("fid")
        }

        leaf_fid = existing.get(normalized)
        if leaf_fid:
            return leaf_fid

        for prefix in prefixes:
            if prefix in existing:
                continue
            result = self.mkdir(prefix)
            if self._api_success(result) and result.get("data", {}).get("fid"):
                existing[prefix] = str(result["data"]["fid"])
                continue
            raise TransferError(
                TransferErrorCode.NETWORK_ERROR,
                message=f"创建目录失败: {result.get('message', result)}",
                platform=self.PLATFORM_KEY,
            )
        return existing[normalized]

    def mkdir(self, dir_path: str) -> Dict[str, Any]:
        url = "https://pc-api.uc.cn/1/clouddrive/file"
        params = {"pr": "UCBrowser", "fr": "pc", "uc_param_str": ""}
        payload = {
            "pdir_fid": "0",
            "file_name": "",
            "dir_path": self._normalize_dir_path(dir_path),
            "dir_init_lock": False,
        }
        return self._drive_api_json(self._post(url, json_data=payload, params=params, headers=self._credential.get_headers()), context="写入网盘目录")

    def rename(self, fid: str, file_name: str) -> Dict[str, Any]:
        url = "https://pc-api.uc.cn/1/clouddrive/file/rename"
        params = {"pr": "UCBrowser", "fr": "pc", "uc_param_str": ""}
        payload = {"fid": fid, "file_name": file_name}
        return self._drive_api_json(self._post(url, json_data=payload, params=params, headers=self._credential.get_headers()), context="写入网盘目录")

    def get_fids(self, file_paths: List[str]) -> List[Dict[str, Any]]:
        pending = [self._normalize_dir_path(p) for p in file_paths]
        result: List[Dict[str, Any]] = []
        while pending:
            batch, pending = pending[:50], pending[50:]
            url = "https://pc-api.uc.cn/1/clouddrive/file/info/path_list"
            params = {"pr": "UCBrowser", "fr": "pc"}
            payload = {"file_path": batch, "namespace": "0"}
            data = self._drive_api_json(self._post(url, json_data=payload, params=params, headers=self._credential.get_headers()), context="按路径获取文件ID")
            if not self._api_success(data):
                raise TransferError(
                    TransferErrorCode.NETWORK_ERROR,
                    message=f"获取目录ID失败: {data.get('message', data)}",
                    platform=self.PLATFORM_KEY,
                )
            result.extend(data.get("data", []))
        return result

    def move_files(self, fids: List[str], to_pdir_fid: str) -> Dict[str, Any]:
        if not fids:
            return {"code": 0, "message": "无文件需要移动"}
        last: Dict[str, Any] = {"code": 0, "message": "success"}
        for offset in range(0, len(fids), 100):
            batch = fids[offset:offset + 100]
            url = "https://pc-api.uc.cn/1/clouddrive/file/move"
            params = {"uc_param_str": "", "fr": "pc", "pr": "UCBrowser"}
            payload = {"filelist": batch, "to_pdir_fid": to_pdir_fid, "exclude_fids": [], "action_type": 1}
            last = self._drive_api_json(self._post(url, json_data=payload, params=params, headers=self._credential.get_headers()), context="移动网盘文件")
            if not self._api_success(last):
                return last
            task_id = last.get("data", {}).get("task_id")
            if task_id:
                task = self.query_task(task_id)
                if not self._api_success(task) or task.get("data", {}).get("status") == -1:
                    return {"code": 1, "message": task.get("data", {}).get("message", task.get("message", "移动任务失败")), "data": task.get("data", {})}
        return {"code": 0, "message": "移动完成", "data": last.get("data", {})}

    def _task_query_params(self, retry_index: int = 0) -> Dict[str, Any]:
        now_ms = int(time.time() * 1000)
        return {
            "pr": "UCBrowser",
            "fr": "pc",
            "uc_param_str": "",
            "retry_index": retry_index,
            "__dt": 300,
            "__t": now_ms,
        }

    def delete_files(self, fids: List[str]) -> Dict[str, Any]:
        if not fids:
            return {"code": 0, "status": 200}
        if self.delete(fids):
            return {"code": 0, "status": 200}
        return {"code": 1, "status": 500, "message": "删除文件失败"}

    def query_task(self, task_id: str) -> Dict[str, Any]:
        url = "https://pc-api.uc.cn/1/clouddrive/task"
        try:
            data = self._poll_task(url, task_id, query_params=self._task_query_params)
            return {"code": 0, "status": 200, "data": data}
        except TransferError as exc:
            return {"code": 1, "status": 500, "message": str(exc), "data": {"status": -1}}

    def get_or_create_share_folder(self) -> Optional[str]:
        if getattr(self, "_share_folder_fid", None):
            return self._share_folder_fid
        root = self.ls_dir("0")
        if self._api_success(root):
            for item in root.get("data", {}).get("list", []):
                if item.get("file_name") == "来自：分享" and item.get("dir"):
                    self._share_folder_fid = str(item["fid"])
                    return self._share_folder_fid
        result = self.mkdir("/来自：分享")
        if self._api_success(result) and result.get("data", {}).get("fid"):
            self._share_folder_fid = str(result["data"]["fid"])
            return self._share_folder_fid
        return None

    def ls_dir(self, pdir_fid: str) -> Dict[str, Any]:
        url = "https://pc-api.uc.cn/1/clouddrive/file/sort"
        params = {"pr": "UCBrowser", "fr": "pc", "pdir_fid": pdir_fid or "0", "_page": 1, "_size": 50, "_fetch_total": 1, "_fetch_sub_dirs": 0, "_sort": "file_type:asc,updated_at:desc"}
        return self._drive_api_json(self._get(url, params=params, headers=self._credential.get_headers()), context="列出网盘目录")


    # ─── get_files / delete ────────────────────────────────────

    def get_files(self, parent_fid: str = "0") -> List[FileInfo]:
        """列出 UC 网盘指定目录下的文件。

        GET /1/clouddrive/file/sort?pdir_fid=<parent_fid>&_page=1&_size=100&_sort=updated_at:desc

        Args:
            parent_fid: 父目录 ID，默认 "0" 即根目录。

        Returns:
            FileInfo 列表。
        """
        url: str = f"https://pc-api.uc.cn/1/clouddrive/file/sort"
        params: Dict[str, str] = {
            "pdir_fid": parent_fid,
            "_page": "1",
            "_size": "100",
            "_sort": "updated_at:desc",
        }
        headers: Dict[str, str] = self._credential.get_headers()

        try:
            resp = self._get(url, params=params, headers=headers)
        except Exception as exc:
            raise TransferError(
                TransferErrorCode.NETWORK_ERROR,
                message=f"获取文件列表失败: {exc}",
                platform=self.PLATFORM_KEY,
            ) from exc

        data: Dict[str, Any] = resp.json()
        status: int = data.get("status", -1)
        if status != 0 and data.get("code") not in (0, None):
            raise TransferError(
                TransferErrorCode.NETWORK_ERROR,
                message=f"获取文件列表失败: {data.get('message')}",
                platform=self.PLATFORM_KEY,
            )

        files_data: List[Dict[str, Any]] = data.get("data", {}).get("list", [])
        result: List[FileInfo] = []
        for f in files_data:
            result.append(
                FileInfo(
                    fid=str(f.get("fid", "")),
                    name=str(f.get("file_name", f.get("name", ""))),
                    size=int(f.get("size", 0)),
                    is_dir=bool(f.get("dir", f.get("is_dir", False))),
                    ext=str(f.get("file_extension", f.get("ext", ""))),
                )
            )

        logger.debug("[UcAdapter] Listed %d files in dir=%s", len(result), parent_fid)
        return result

    def delete(self, file_ids: List[str]) -> bool:
        """删除 UC 网盘文件（移到回收站）。

        Args:
            file_ids: 要删除的文件 ID 列表。

        Returns:
            True 表示删除成功。
        """
        if not self._credential.validate():
            raise TransferError(
                TransferErrorCode.NOT_LOGIN,
                platform=self.PLATFORM_KEY,
            )

        try:
            return self._cleanup.delete_files(file_ids)
        except RuntimeError as exc:
            raise TransferError(
                TransferErrorCode.NETWORK_ERROR,
                message=str(exc),
                platform=self.PLATFORM_KEY,
            ) from exc

    def delete_permanent(self, file_ids: List[str]) -> bool:
        """彻底删除 UC 网盘文件（不可恢复）。

        Args:
            file_ids: 要彻底删除的文件 ID 列表。

        Returns:
            True 表示删除成功。
        """
        if not self._credential.validate():
            raise TransferError(
                TransferErrorCode.NOT_LOGIN,
                platform=self.PLATFORM_KEY,
            )

        try:
            return self._cleanup.delete_files_permanent(file_ids)
        except RuntimeError as exc:
            raise TransferError(
                TransferErrorCode.NETWORK_ERROR,
                message=str(exc),
                platform=self.PLATFORM_KEY,
            ) from exc

    # ─── 工具方法 ─────────────────────────────────────────────

    def _parse_share_url(self, url: str) -> Tuple[str, str]:
        """解析 UC 分享 URL 提取 (pwd_id, passcode)。

        UC 链接格式：https://drive.uc.cn/s/<pwd_id> 或带 ?pwd=xxxx

        Args:
            url: UC 分享链接。

        Returns:
            (pwd_id, passcode) 元组。

        Raises:
            TransferError: URL 格式无法识别。
        """
        pwd_id: Optional[str] = UcTransfer.parse_share_url(url)
        if not pwd_id:
            raise TransferError(
                TransferErrorCode.URL_INVALID,
                message=f"无法解析UC链接: {url}",
                platform=self.PLATFORM_KEY,
            )

        parsed = urlparse(url)
        params = parse_qs(parsed.query)
        passcode: str = params.get("pwd", params.get("code", [""]))[0]

        return pwd_id, passcode

    def update_cookie(self, cookie: str) -> None:
        """动态更新 Cookie 并同步到 session headers。

        Args:
            cookie: 新的 Cookie 字符串。
        """
        self._credential.update_cookie(cookie)
        self._setup_session()
        logger.info("[UcAdapter] Cookie updated, new length=%d", len(cookie))

    def close(self) -> None:
        """关闭所有子模块的 HTTP 会话。"""
        self._transfer_engine.close()