"""
供应商管理路由模块

提供供应商信息的管理功能，包括：
- 供应商列表查询（支持分页、搜索）
- 创建新供应商（自动生成供应商编码）
- 更新供应商信息
- 删除供应商（软删除）

路由前缀: /api/suppliers
"""
from fastapi import APIRouter, Depends, Query, HTTPException
from sqlalchemy.ext.asyncio import AsyncSession
from sqlalchemy import select
from typing import Optional, List
from datetime import datetime

from shared.database.database import get_db_session
from shared.services.auth_service import get_current_active_user, get_current_admin_user
from shared.models.database import User, Supplier
from .schemas import SupplierCreate, SupplierResponse

router = APIRouter(prefix="/suppliers", tags=["供应商管理"])


@router.get("", response_model=List[SupplierResponse])
async def list_suppliers(
    skip: int = Query(0, ge=0),
    limit: int = Query(20, ge=1, le=100),
    search: Optional[str] = None,
    db_session: AsyncSession = Depends(get_db_session),
    current_user: User = Depends(get_current_active_user)
):
    query = select(Supplier).where(Supplier.is_active == True)
    if search:
        query = query.where(Supplier.name.ilike(f"%{search}%"))
    query = query.offset(skip).limit(limit).order_by(Supplier.created_at.desc())
    result = await db_session.execute(query)
    return [SupplierResponse.from_orm(s) for s in result.scalars().all()]


@router.post("", response_model=SupplierResponse, status_code=201)
async def create_supplier(
    supplier_data: SupplierCreate,
    db_session: AsyncSession = Depends(get_db_session),
    current_user: User = Depends(get_current_active_user)
):
    data = supplier_data.dict()
    if not data.get("code"):
        data["code"] = f"S{datetime.now().strftime('%Y%m%d%H%M%S')}"
    
    supplier = Supplier(**data)
    db_session.add(supplier)
    await db_session.commit()
    await db_session.refresh(supplier)
    return SupplierResponse.from_orm(supplier)


@router.put("/{supplier_id}", response_model=SupplierResponse)
async def update_supplier(
    supplier_id: int,
    supplier_data: SupplierCreate,
    db_session: AsyncSession = Depends(get_db_session),
    current_user: User = Depends(get_current_active_user)
):
    result = await db_session.execute(select(Supplier).where(Supplier.id == supplier_id))
    supplier = result.scalar_one_or_none()
    if not supplier:
        raise HTTPException(status_code=404, detail="供应商不存在")
    
    for key, value in supplier_data.dict().items():
        setattr(supplier, key, value)
    
    await db_session.commit()
    await db_session.refresh(supplier)
    return SupplierResponse.from_orm(supplier)


@router.delete("/{supplier_id}")
async def delete_supplier(
    supplier_id: int,
    db_session: AsyncSession = Depends(get_db_session),
    current_user: User = Depends(get_current_admin_user)
):
    result = await db_session.execute(select(Supplier).where(Supplier.id == supplier_id))
    supplier = result.scalar_one_or_none()
    if not supplier:
        raise HTTPException(status_code=404, detail="供应商不存在")
    
    supplier.is_active = False
    await db_session.commit()
    return {"message": "供应商已删除"}