"""
網路硬碟管理 API
"""
from typing import List
from fastapi import APIRouter, Depends, HTTPException, status
from sqlalchemy.orm import Session

from app.db.session import get_db
from app.models.employee import Employee
from app.models.network_drive import NetworkDrive
from app.schemas.network_drive import (
    NetworkDriveCreate,
    NetworkDriveUpdate,
    NetworkDriveResponse,
    NetworkDriveListItem,
    NetworkDriveQuotaUpdate,
)
from app.schemas.response import MessageResponse

router = APIRouter()


@router.get("/", response_model=List[NetworkDriveListItem])
def get_network_drives(
    db: Session = Depends(get_db),
    is_active: bool = True,
):
    """
    獲取網路硬碟列表
    """
    query = db.query(NetworkDrive)

    if is_active is not None:
        query = query.filter(NetworkDrive.is_active == is_active)

    network_drives = query.order_by(NetworkDrive.drive_name).all()

    return [NetworkDriveListItem.model_validate(nd) for nd in network_drives]


@router.get("/{network_drive_id}", response_model=NetworkDriveResponse)
def get_network_drive(
    network_drive_id: int,
    db: Session = Depends(get_db),
):
    """
    獲取網路硬碟詳情
    """
    network_drive = db.query(NetworkDrive).filter(
        NetworkDrive.id == network_drive_id
    ).first()

    if not network_drive:
        raise HTTPException(
            status_code=status.HTTP_404_NOT_FOUND,
            detail=f"Network drive with id {network_drive_id} not found"
        )

    response = NetworkDriveResponse.model_validate(network_drive)
    response.employee_name = network_drive.employee.legal_name
    response.employee_username = network_drive.employee.username_base

    return response


@router.post("/", response_model=NetworkDriveResponse, status_code=status.HTTP_201_CREATED)
def create_network_drive(
    network_drive_data: NetworkDriveCreate,
    db: Session = Depends(get_db),
):
    """
    創建網路硬碟

    檢查:
    - 員工是否存在
    - 員工是否已有 NAS 帳號
    - drive_name 唯一性
    """
    # 檢查員工是否存在
    employee = db.query(Employee).filter(
        Employee.id == network_drive_data.employee_id
    ).first()

    if not employee:
        raise HTTPException(
            status_code=status.HTTP_404_NOT_FOUND,
            detail=f"Employee with id {network_drive_data.employee_id} not found"
        )

    # 檢查員工是否已有 NAS 帳號
    existing = db.query(NetworkDrive).filter(
        NetworkDrive.employee_id == network_drive_data.employee_id
    ).first()

    if existing:
        raise HTTPException(
            status_code=status.HTTP_400_BAD_REQUEST,
            detail=f"Employee already has a network drive"
        )

    # 檢查 drive_name 是否已存在
    existing_name = db.query(NetworkDrive).filter(
        NetworkDrive.drive_name == network_drive_data.drive_name
    ).first()

    if existing_name:
        raise HTTPException(
            status_code=status.HTTP_400_BAD_REQUEST,
            detail=f"Drive name '{network_drive_data.drive_name}' already exists"
        )

    # 創建網路硬碟
    network_drive = NetworkDrive(**network_drive_data.model_dump())

    db.add(network_drive)
    db.commit()
    db.refresh(network_drive)

    # TODO: 創建審計日誌
    # TODO: 在 NAS 上創建實際帳號

    response = NetworkDriveResponse.model_validate(network_drive)
    response.employee_name = employee.legal_name
    response.employee_username = employee.username_base

    return response


@router.put("/{network_drive_id}", response_model=NetworkDriveResponse)
def update_network_drive(
    network_drive_id: int,
    network_drive_data: NetworkDriveUpdate,
    db: Session = Depends(get_db),
):
    """
    更新網路硬碟

    可更新: quota_gb, webdav_url, smb_url, is_active
    """
    network_drive = db.query(NetworkDrive).filter(
        NetworkDrive.id == network_drive_id
    ).first()

    if not network_drive:
        raise HTTPException(
            status_code=status.HTTP_404_NOT_FOUND,
            detail=f"Network drive with id {network_drive_id} not found"
        )

    # 更新欄位
    update_data = network_drive_data.model_dump(exclude_unset=True)
    for field, value in update_data.items():
        setattr(network_drive, field, value)

    db.commit()
    db.refresh(network_drive)

    # TODO: 創建審計日誌
    # TODO: 更新 NAS 配額

    response = NetworkDriveResponse.model_validate(network_drive)
    response.employee_name = network_drive.employee.legal_name
    response.employee_username = network_drive.employee.username_base

    return response


@router.patch("/{network_drive_id}/quota", response_model=NetworkDriveResponse)
def update_network_drive_quota(
    network_drive_id: int,
    quota_data: NetworkDriveQuotaUpdate,
    db: Session = Depends(get_db),
):
    """
    更新網路硬碟配額

    專用端點,僅更新配額
    """
    network_drive = db.query(NetworkDrive).filter(
        NetworkDrive.id == network_drive_id
    ).first()

    if not network_drive:
        raise HTTPException(
            status_code=status.HTTP_404_NOT_FOUND,
            detail=f"Network drive with id {network_drive_id} not found"
        )

    network_drive.quota_gb = quota_data.quota_gb

    db.commit()
    db.refresh(network_drive)

    # TODO: 創建審計日誌
    # TODO: 更新 NAS 配額

    response = NetworkDriveResponse.model_validate(network_drive)
    response.employee_name = network_drive.employee.legal_name
    response.employee_username = network_drive.employee.username_base

    return response


@router.delete("/{network_drive_id}", response_model=MessageResponse)
def delete_network_drive(
    network_drive_id: int,
    db: Session = Depends(get_db),
):
    """
    停用網路硬碟

    注意: 這是軟刪除,只將 is_active 設為 False
    """
    network_drive = db.query(NetworkDrive).filter(
        NetworkDrive.id == network_drive_id
    ).first()

    if not network_drive:
        raise HTTPException(
            status_code=status.HTTP_404_NOT_FOUND,
            detail=f"Network drive with id {network_drive_id} not found"
        )

    network_drive.is_active = False

    db.commit()

    # TODO: 創建審計日誌
    # TODO: 停用 NAS 帳號 (但保留資料)

    return MessageResponse(
        message=f"Network drive '{network_drive.drive_name}' has been deactivated"
    )


@router.get("/by-employee/{employee_id}", response_model=NetworkDriveResponse)
def get_network_drive_by_employee(
    employee_id: int,
    db: Session = Depends(get_db),
):
    """
    根據員工 ID 獲取網路硬碟
    """
    employee = db.query(Employee).filter(Employee.id == employee_id).first()

    if not employee:
        raise HTTPException(
            status_code=status.HTTP_404_NOT_FOUND,
            detail=f"Employee with id {employee_id} not found"
        )

    if not employee.network_drive:
        raise HTTPException(
            status_code=status.HTTP_404_NOT_FOUND,
            detail=f"Employee does not have a network drive"
        )

    response = NetworkDriveResponse.model_validate(employee.network_drive)
    response.employee_name = employee.legal_name
    response.employee_username = employee.username_base

    return response