"""认证路由：注册、登录、登出、用户信息。"""

from fastapi import APIRouter, Depends, Response
from sqlalchemy.orm import Session

from app.api.deps import get_current_user, get_db
from app.core.session import get_cookie_params
from app.models.user import User
from app.schemas.user import (
    LoginRequest,
    MeResponse,
    RegisterRequest,
    StorageInfoResponse,
    UpdateMeRequest,
    UserResponse,
)
from app.services.auth_service import AuthService

router = APIRouter(prefix="/auth", tags=["auth"])


@router.post("/register", response_model=UserResponse, status_code=201)
def register(body: RegisterRequest, response: Response, db: Session = Depends(get_db)) -> UserResponse:
    """注册新用户并自动登录。"""
    auth_service = AuthService(db)
    user, token = auth_service.register(body.username, body.email, body.password)
    response.set_cookie(value=token, **get_cookie_params())
    return _user_response(user)


@router.post("/login", response_model=UserResponse)
def login(body: LoginRequest, response: Response, db: Session = Depends(get_db)) -> UserResponse:
    """登录。"""
    auth_service = AuthService(db)
    user, token = auth_service.login(body.username_or_email, body.password)
    response.set_cookie(value=token, **get_cookie_params())
    return _user_response(user)


@router.post("/logout", status_code=204)
def logout(
    response: Response,
    user: User = Depends(get_current_user),
    db: Session = Depends(get_db),
) -> None:
    """登出：删除 session 并清除 Cookie。"""
    from app.core.session import SESSION_COOKIE_NAME

    token = ""  # 不需要实际 token，logout 内部通过 user_id 找 session
    auth_service = AuthService(db)
    # 直接删除所有该用户的 session（MVP 简化：单设备）
    from app.core.session import _store

    to_delete = [t for t, e in _store.items() if e.user_id == user.id]
    for t in to_delete:
        auth_service.logout(t)

    response.delete_cookie(SESSION_COOKIE_NAME, path="/")
    return None


@router.get("/me", response_model=MeResponse)
def get_me(user: User = Depends(get_current_user)) -> MeResponse:
    """获取当前用户信息。"""
    from app.core.config import get_settings

    settings = get_settings()
    return MeResponse(
        id=user.id,
        username=user.username,
        email=user.email,
        status=user.status,
        storage_used=user.storage_used,
        storage_quota=settings.default_storage_quota,
        created_at=user.created_at,
    )


@router.patch("/me", response_model=MeResponse)
def update_me(
    body: UpdateMeRequest,
    user: User = Depends(get_current_user),
    db: Session = Depends(get_db),
) -> MeResponse:
    """修改密码。"""
    auth_service = AuthService(db)
    if body.password is not None:
        auth_service.change_password(user, body.password)
    from app.core.config import get_settings

    settings = get_settings()
    return MeResponse(
        id=user.id,
        username=user.username,
        email=user.email,
        status=user.status,
        storage_used=user.storage_used,
        storage_quota=settings.default_storage_quota,
        created_at=user.created_at,
    )


@router.get("/storage", response_model=StorageInfoResponse)
def get_storage(user: User = Depends(get_current_user)) -> StorageInfoResponse:
    """获取存储用量信息。"""
    from app.core.config import get_settings

    settings = get_settings()
    return StorageInfoResponse(
        storage_used=user.storage_used,
        storage_quota=settings.default_storage_quota,
        storage_used_mb=round(user.storage_used / (1024 * 1024), 2),
        storage_quota_mb=round(settings.default_storage_quota / (1024 * 1024), 2),
    )


def _user_response(user: User) -> UserResponse:
    from app.core.config import get_settings

    settings = get_settings()
    return UserResponse(
        id=user.id,
        username=user.username,
        email=user.email,
        status=user.status,
        storage_used=user.storage_used,
        storage_quota=settings.default_storage_quota,
        created_at=user.created_at,
    )