import { redirect } from "next/navigation"

import { auth } from "@/auth"
import { prisma } from "@/lib/prisma"
import { createJoinLinkToken } from "@/lib/join-link"
import { DashboardContent } from "@/components/dashboard/dashboard-content"
import type { MeetingDTO } from "@/components/dashboard/types"

// This route reads the session (cookies) and queries the DB for the
// current user's meetings on every request, so it can't be part of the
// static shell under Cache Components. Opting out of instant-navigation
// validation here is the documented migration path (see
// node_modules/next/dist/docs/01-app/02-guides/authentication-with-cache-components.md)
// for a route that should always render fresh data rather than a cached
// shell — dashboard data (active/upcoming meetings) must never be stale.
export const instant = false

const PAST_MEETINGS_LIMIT = 10

export default async function DashboardPage() {
  const session = await auth()

  if (!session?.user?.id) {
    redirect("/login?callbackUrl=/dashboard")
  }

  const hostUserId = Number(session.user.id)

  const [activeMeetings, upcomingMeetings, pastMeetings] = await Promise.all([
    prisma.meeting.findMany({
      where: { hostUserId, status: "active" },
      orderBy: { startedAt: "desc" },
    }),
    prisma.meeting.findMany({
      where: {
        hostUserId,
        status: "scheduled",
        scheduledAt: { gte: new Date() },
      },
      orderBy: { scheduledAt: "asc" },
    }),
    prisma.meeting.findMany({
      where: { hostUserId, status: "ended" },
      orderBy: { endedAt: "desc" },
      take: PAST_MEETINGS_LIMIT,
    }),
  ])

  async function toDTO(
    meeting: (typeof activeMeetings)[number],
    withJoinLink: boolean
  ): Promise<MeetingDTO> {
    return {
      id: meeting.id,
      uuid: meeting.uuid,
      title: meeting.title,
      type: meeting.type,
      status: meeting.status,
      scheduledAt: meeting.scheduledAt?.toISOString() ?? null,
      startedAt: meeting.startedAt?.toISOString() ?? null,
      endedAt: meeting.endedAt?.toISOString() ?? null,
      joinUrl: withJoinLink
        ? `/join/${meeting.uuid}?token=${await createJoinLinkToken(meeting.uuid, {
            scheduledAt: meeting.scheduledAt,
          })}`
        : null,
    }
  }

  const [active, upcoming, past] = await Promise.all([
    Promise.all(activeMeetings.map((meeting) => toDTO(meeting, true))),
    Promise.all(upcomingMeetings.map((meeting) => toDTO(meeting, true))),
    Promise.all(pastMeetings.map((meeting) => toDTO(meeting, false))),
  ])

  return (
    <DashboardContent
      displayName={session.user.displayName}
      active={active}
      upcoming={upcoming}
      past={past}
    />
  )
}