import { NextResponse } from "next/server"
import { and, eq } from "drizzle-orm"
import { db } from "@/lib/db"
import { tenants, units } from "@/lib/db/schema"
import { getSessionUser } from "@/lib/session"
import { tenantSchema } from "@/lib/validations"
import { ownsProperty, ownsUnit } from "@/lib/db/ownership"

export async function GET(_: Request, { params }: { params: Promise<{ id: string }> }) {
  const user = await getSessionUser()
  if (!user) return NextResponse.json({ error: "Unauthorized" }, { status: 401 })

  const { id } = await params
  const data = await db.query.tenants.findFirst({
    where: and(eq(tenants.id, id), eq(tenants.user_id, user.id)),
    with: {
      unit: {},
      property: {},
      leases: {},
      rent_payments: {},
    },
  })

  if (!data) return NextResponse.json({ error: "Not found" }, { status: 404 })
  return NextResponse.json(data)
}

export async function PATCH(request: Request, { params }: { params: Promise<{ id: string }> }) {
  const user = await getSessionUser()
  if (!user) return NextResponse.json({ error: "Unauthorized" }, { status: 401 })

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

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

  try {
    const [data] = await db
      .update(tenants)
      .set(parsed.data)
      .where(and(eq(tenants.id, id), eq(tenants.user_id, user.id)))
      .returning()

    return NextResponse.json(data)
  } catch (e) {
    return NextResponse.json({ error: (e as Error).message }, { status: 500 })
  }
}

export async function DELETE(_: Request, { params }: { params: Promise<{ id: string }> }) {
  const user = await getSessionUser()
  if (!user) return NextResponse.json({ error: "Unauthorized" }, { status: 401 })

  const { id } = await params

  try {
    // Get tenant to free unit
    const tenant = await db.query.tenants.findFirst({
      where: and(eq(tenants.id, id), eq(tenants.user_id, user.id)),
      columns: { unit_id: true },
    })

    await db.delete(tenants).where(and(eq(tenants.id, id), eq(tenants.user_id, user.id)))

    // Free unit
    if (tenant?.unit_id) {
      await db
        .update(units)
        .set({ status: "vacant", current_tenant_id: null })
        .where(and(eq(units.id, tenant.unit_id), eq(units.user_id, user.id)))
    }

    return NextResponse.json({ success: true })
  } catch (e) {
    return NextResponse.json({ error: (e as Error).message }, { status: 500 })
  }
}