import Link from "next/link";
import { BellRing, Plus } from "lucide-react";
import { prisma } from "@/lib/prisma";
import { requireUser } from "@/lib/rbac";
import { formatRelativeID } from "@/lib/utils";
import { FOLLOW_UP_STATUSES, FOLLOW_UP_META } from "@/lib/constants";
import { PageHeader } from "@/components/ui/page-header";
import { Card } from "@/components/ui/card";
import { Avatar } from "@/components/ui/avatar";
import { EmptyState } from "@/components/ui/empty-state";
import { FollowUpStatusForm } from "@/components/follow-up/status-form";
import { SourceChip, StatusBadge } from "@/components/students/badges";
import { cn } from "@/lib/utils";

export const metadata = { title: "Follow Up — Kodeva" };

export default async function FollowUpPage() {
  await requireUser();

  const followUps = await prisma.followUp.findMany({
    include: { student: true, pic: true, activities: { orderBy: { createdAt: "desc" }, take: 1 } },
    orderBy: { updatedAt: "desc" },
  });

  const columns = FOLLOW_UP_STATUSES.map((status) => ({
    status,
    items: followUps.filter((f) => f.status === status),
  }));

  const now = new Date();
  const isDue = (d: Date | null) => d && d.getTime() <= now.getTime();

  return (
    <div>
      <PageHeader
        title="Follow Up Siswa"
        description="Pantau dan pindahkan status follow up calon siswa."
      />

      {/* Quick create */}
      <Card className="mb-6 p-4">
        <form action="/follow-up" className="hidden">
          <input type="hidden" name="q" value="" />
        </form>
        <Link href="/students?status=CALON_STUDENT">
          <p className="flex items-center gap-2 text-[13px] font-medium text-ink-500">
            <Plus className="size-4 text-brand-500" />
            Follow up baru dibuat otomatis saat menambah calon siswa. Lihat calon siswa →
          </p>
        </Link>
      </Card>

      {/* Board */}
      <div className="grid grid-cols-1 gap-4 sm:grid-cols-2 lg:grid-cols-3 xl:grid-cols-6">
        {columns.map((col) => {
          const meta = FOLLOW_UP_META[col.status];
          return (
            <div key={col.status} className="rounded-[18px] bg-canvas p-2.5">
              <div className="mb-2 flex items-center justify-between px-1.5">
                <div className="flex items-center gap-2">
                  <span className="size-2 rounded-full" style={{ backgroundColor: meta.color }} />
                  <h3 className="text-[13px] font-semibold text-ink-900">{meta.label}</h3>
                </div>
                <span className="font-num rounded-full bg-surface px-2 py-0.5 text-[12px] font-bold text-ink-700">
                  {col.items.length}
                </span>
              </div>

              <div className="space-y-2.5">
                {col.items.length === 0 ? (
                  <div className="rounded-[12px] border border-dashed border-ink-300 py-6 text-center text-[12px] text-ink-500">
                    Kosong
                  </div>
                ) : (
                  col.items.map((f) => (
                    <div key={f.id} className="rounded-[14px] border border-ink-100 bg-surface p-3 shadow-[var(--shadow-xs)]">
                      <Link href={`/students/${f.student.id}`} className="flex items-center gap-2.5">
                        <Avatar src={f.student.photoUrl} name={f.student.fullName} size={34} />
                        <div className="min-w-0 flex-1">
                          <p className="truncate text-[13px] font-semibold text-ink-900">{f.student.fullName}</p>
                          <p className="truncate text-[11px] text-ink-500">{f.student.phone}</p>
                        </div>
                      </Link>

                      <div className="mt-2 flex flex-wrap items-center gap-1.5">
                        <SourceChip source={f.student.leadSource} />
                        <StatusBadge status={f.student.status} />
                      </div>

                      <div className="mt-2.5 flex items-center justify-between gap-2">
                        <FollowUpStatusForm id={f.id} status={f.status} />
                        {f.nextFollowUpAt ? (
                          <span
                            className={cn(
                              "text-[11px] font-medium",
                              isDue(f.nextFollowUpAt) ? "text-danger-500" : "text-ink-500",
                            )}
                          >
                            {formatRelativeID(f.nextFollowUpAt)}
                          </span>
                        ) : null}
                      </div>

                      {f.activities[0] ? (
                        <p className="mt-2 line-clamp-2 rounded-[10px] bg-canvas px-2 py-1.5 text-[11.5px] text-ink-500">
                          {f.activities[0].note}
                        </p>
                      ) : null}
                    </div>
                  ))
                )}
              </div>
            </div>
          );
        })}
      </div>

      {followUps.length === 0 ? (
        <div className="mt-6">
          <EmptyState icon={<BellRing className="size-6" />} title="Belum ada follow up" description="Tambahkan calon siswa untuk mulai follow up." />
        </div>
      ) : null}
    </div>
  );
}