import { NextResponse } from "next/server"
import { and, desc, eq } from "drizzle-orm"
import { db } from "@/lib/db"
import { maintenance_requests, tenants } from "@/lib/db/schema"
import { getSessionUser } from "@/lib/session"
import { maintenanceSchema } from "@/lib/validations"
import { ownsProperty, ownsUnit, ownsTenant } from "@/lib/db/ownership"
import { logActivity } from "@/lib/activity"
import { getEffectiveOwnerId, getAccountContext } from "@/lib/account"
import { emitWebhookEvent } from "@/lib/webhooks/emit"

const VALID_STATUSES = ["open", "in_progress", "resolved", "closed"]
const VALID_PRIORITIES = ["low", "medium", "high", "emergency"]

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 status = searchParams.get("status")
  const priority = searchParams.get("priority")
  const propertyId = searchParams.get("property_id")

  // Validate enum filters
  if (status && !VALID_STATUSES.includes(status)) {
    return NextResponse.json({ error: "Invalid status" }, { status: 400 })
  }
  if (priority && !VALID_PRIORITIES.includes(priority)) {
    return NextResponse.json({ error: "Invalid priority" }, { status: 400 })
  }

  const data = await db.query.maintenance_requests.findMany({
    where: and(
      eq(maintenance_requests.user_id, ownerId),
      status ? eq(maintenance_requests.status, status as typeof maintenance_requests.$inferSelect.status) : undefined,
      priority ? eq(maintenance_requests.priority, priority as typeof maintenance_requests.$inferSelect.priority) : undefined,
      propertyId ? eq(maintenance_requests.property_id, propertyId) : undefined
    ),
    with: {
      property: { columns: { name: true } },
      unit: { columns: { unit_number: true } },
      tenant: { columns: { first_name: true, last_name: true } },
    },
    orderBy: desc(maintenance_requests.created_at),
  })

  return NextResponse.json(data)
}

export async function POST(request: Request) {
  const body = await request.json()

  const user = await getSessionUser()

  let userId: string

  if (user) {
    // Authenticated landlord — scope to the account owner and enforce write access.
    const ctx = await getAccountContext(user.id)
    if (!ctx.canWrite) return NextResponse.json({ error: "Forbidden" }, { status: 403 })
    userId = ctx.ownerId
  } else {
    // Tenant portal submission — verify portal_token
    const portalToken = body.portal_token as string | undefined
    if (!portalToken) {
      return NextResponse.json({ error: "Unauthorized" }, { status: 401 })
    }

    const tenant = await db.query.tenants.findFirst({
      where: eq(tenants.portal_token, portalToken),
      columns: { id: true, user_id: true, property_id: true, unit_id: true },
    })

    if (!tenant) return NextResponse.json({ error: "Invalid portal token" }, { status: 401 })

    // Validate tenant owns the submitted property/unit — prevent cross-property submissions
    if (body.property_id && body.property_id !== tenant.property_id) {
      return NextResponse.json({ error: "Forbidden" }, { status: 403 })
    }
    if (body.unit_id && body.unit_id !== tenant.unit_id) {
      return NextResponse.json({ error: "Forbidden" }, { status: 403 })
    }
    if (body.tenant_id && body.tenant_id !== tenant.id) {
      return NextResponse.json({ error: "Forbidden" }, { status: 403 })
    }

    userId = tenant.user_id
  }

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

  // Authenticated-landlord path: verify the caller owns the submitted references.
  // (The portal-token path already validates these against the tenant above.)
  if (
    user &&
    (!(await ownsProperty(userId, parsed.data.property_id)) ||
      !(await ownsUnit(userId, parsed.data.unit_id)) ||
      !(await ownsTenant(userId, parsed.data.tenant_id)))
  ) {
    return NextResponse.json({ error: "Forbidden" }, { status: 403 })
  }

  const [data] = await db
    .insert(maintenance_requests)
    .values({ ...parsed.data, user_id: userId, status: "open" })
    .returning()

  await logActivity({
    userId,
    type: "maintenance_opened",
    title: `Maintenance request opened: ${parsed.data.title}`,
    description: `Priority: ${parsed.data.priority ?? "medium"}`,
    entityType: "maintenance",
    entityId: data.id,
  })

  await emitWebhookEvent({
    ownerId: userId,
    event: "maintenance.created",
    data: { maintenance: data },
  })

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