property-management-network/app/api/expenses/route.ts

import { NextResponse } from "next/server"
import { and, desc, eq } from "drizzle-orm"
import { db } from "@/lib/db"
import { expenses } from "@/lib/db/schema"
import { getSessionUser } from "@/lib/session"
import { expenseSchema } from "@/lib/validations"
import { ownsProperty, ownsUnit } from "@/lib/db/ownership"
import { getEffectiveOwnerId, getAccountContext } from "@/lib/account"

export async function GET(request: Request) {
  const user = await getSessionUser()
  if (!user) return NextResponse.json({ error: "Unauthorized" }, { status: 401 })

  const ownerId = await getEffectiveOwnerId(user.id)

  const { searchParams } = new URL(request.url)
  const propertyId = searchParams.get("property_id")
  const category = searchParams.get("category")

  const data = await db.query.expenses.findMany({
    where: and(
      eq(expenses.user_id, ownerId),
      propertyId ? eq(expenses.property_id, propertyId) : undefined,
      category ? eq(expenses.category, category as typeof expenses.$inferSelect.category) : undefined
    ),
    with: {
      property: { columns: { name: true } },
      unit: { columns: { unit_number: true } },
    },
    orderBy: desc(expenses.expense_date),
  })

  return NextResponse.json(data)
}

export async function POST(request: Request) {
  const user = await getSessionUser()
  if (!user) return NextResponse.json({ error: "Unauthorized" }, { status: 401 })

  const ctx = await getAccountContext(user.id)
  const ownerId = ctx.ownerId
  if (!ctx.canWrite) return NextResponse.json({ error: "Forbidden" }, { status: 403 })

  const body = await request.json()
  const parsed = expenseSchema.safeParse(body)
  if (!parsed.success) return NextResponse.json({ error: parsed.error.flatten() }, { status: 400 })

  if (
    !(await ownsProperty(ownerId, parsed.data.property_id)) ||
    !(await ownsUnit(ownerId, parsed.data.unit_id))
  ) {
    return NextResponse.json({ error: "Invalid reference" }, { status: 403 })
  }

  const [data] = await db
    .insert(expenses)
    .values({ ...parsed.data, user_id: ownerId })
    .returning()

  return NextResponse.json(data, { status: 201 })
}