flnxi-Wu/app/api/departments/route.ts

import { NextRequest, NextResponse } from 'next/server'
import { getServerSession } from 'next-auth'
import { authOptions } from '@/lib/auth'
import { prisma } from '@/lib/prisma'

// Get all departments
export async function GET() {
  try {
    const departments = await prisma.department.findMany({
      orderBy: {
        createdAt: 'asc',
      },
    })

    return NextResponse.json(departments)
  } catch (error) {
    console.error('Error fetching departments:', error)
    return NextResponse.json(
      { error: '获取部门列表失败' },
      { status: 500 }
    )
  }
}

// Create a new department (admin only)
export async function POST(req: NextRequest) {
  try {
    const session = await getServerSession(authOptions)

    if (!session || (session.user as any).role !== 'ADMIN') {
      return NextResponse.json(
        { error: '无权限' },
        { status: 403 }
      )
    }

    const { name } = await req.json()

    if (!name || name.trim() === '') {
      return NextResponse.json(
        { error: '部门名称不能为空' },
        { status: 400 }
      )
    }

    // Check if department already exists
    const existing = await prisma.department.findUnique({
      where: { name },
    })

    if (existing) {
      return NextResponse.json(
        { error: '部门已存在' },
        { status: 400 }
      )
    }

    const department = await prisma.department.create({
      data: { name },
    })

    return NextResponse.json(department, { status: 201 })
  } catch (error) {
    console.error('Error creating department:', error)
    return NextResponse.json(
      { error: '创建部门失败' },
      { status: 500 }
    )
  }
}

// Rename a department (admin only)
export async function PATCH(req: NextRequest) {
  try {
    const session = await getServerSession(authOptions)

    if (!session || (session.user as any).role !== 'ADMIN') {
      return NextResponse.json(
        { error: '无权限' },
        { status: 403 }
      )
    }

    const { id, name } = await req.json()

    if (!id) {
      return NextResponse.json(
        { error: '缺少部门ID' },
        { status: 400 }
      )
    }

    if (!name || name.trim() === '') {
      return NextResponse.json(
        { error: '部门名称不能为空' },
        { status: 400 }
      )
    }

    // 检查新名称是否被其他部门占用
    const existing = await prisma.department.findUnique({
      where: { name },
    })

    if (existing && existing.id !== id) {
      return NextResponse.json(
        { error: '部门名称已被使用' },
        { status: 400 }
      )
    }

    const updated = await prisma.department.update({
      where: { id },
      data: { name },
    })

    return NextResponse.json(updated)
  } catch (error) {
    console.error('Error updating department:', error)
    return NextResponse.json(
      { error: '更新部门失败' },
      { status: 500 }
    )
  }
}

// Delete a department (admin only)
export async function DELETE(req: NextRequest) {
  try {
    const session = await getServerSession(authOptions)

    if (!session || (session.user as any).role !== 'ADMIN') {
      return NextResponse.json(
        { error: '无权限' },
        { status: 403 }
      )
    }

    const { searchParams } = new URL(req.url)
    const id = searchParams.get('id')

    if (!id) {
      return NextResponse.json(
        { error: '缺少部门ID' },
        { status: 400 }
      )
    }

    await prisma.department.delete({
      where: { id },
    })

    return NextResponse.json({ message: '删除成功' })
  } catch (error) {
    console.error('Error deleting department:', error)
    return NextResponse.json(
      { error: '删除失败' },
      { status: 500 }
    )
  }
}