import { NextResponse } from "next/server"
import { asc, eq } from "drizzle-orm"
import { db } from "@/lib/db"
import { tenants } from "@/lib/db/schema"
import { getSessionUser } from "@/lib/session"

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

  const rows = await db.query.tenants.findMany({
    where: eq(tenants.user_id, user.id),
    with: {
      property: { columns: { name: true } },
      unit: { columns: { unit_number: true } },
    },
    orderBy: asc(tenants.last_name),
  })

  const headers = ["First Name", "Last Name", "Email", "Phone", "Property", "Unit", "Status", "Move In Date", "Notes"]
  const lines = [
    headers.join(","),
    ...rows.map((t) => [
      `"${t.first_name ?? ""}"`,
      `"${t.last_name ?? ""}"`,
      `"${t.email ?? ""}"`,
      `"${t.phone ?? ""}"`,
      `"${t.property?.name ?? ""}"`,
      `"${t.unit?.unit_number ?? ""}"`,
      t.status ?? "",
      t.move_in_date ?? "",
      `"${(t.notes ?? "").replace(/"/g, "'")}"`,
    ].join(","))
  ]

  const csv = lines.join("\n")

  return new NextResponse(csv, {
    headers: {
      "Content-Type": "text/csv; charset=utf-8",
      "Content-Disposition": 'attachment; filename="tenants.csv"',
    },
  })
}