import Link from "next/link";
import { curriculum } from "@/lib/curriculum";
import { Card } from "@/components/ui/card";
import { Badge } from "@/components/ui/badge";
import { Breadcrumbs } from "@/components/layout/breadcrumbs";

export default function Unit4Overview() {
  const unit = curriculum[3];

  return (
    <div>
      <Breadcrumbs
        items={[
          { label: "Lessons", href: "/lessons" },
          { label: `Unit 4: ${unit.title}` },
        ]}
      />
      <div className="mb-10">
        <Badge variant="unit-4" className="mb-3">Unit 4 &mdash; {unit.weeks}</Badge>
        <h1 className="mb-2 text-3xl font-bold tracking-tight">{unit.title}</h1>
        <p className="text-muted leading-relaxed">{unit.description}</p>
      </div>
      <div className="grid gap-4 sm:grid-cols-2">
        {unit.topics.map((topic, i) => (
          <Link key={topic.slug} href={`/lessons/${unit.slug}/${topic.slug}`}>
            <Card accent="unit-4" hover className="group h-full">
              <div className="mb-2 flex items-center gap-2">
                <span className="flex h-7 w-7 items-center justify-center rounded-lg bg-unit-4-light text-xs font-bold text-unit-4-dark shadow-[var(--shadow-sm)]">
                  {String.fromCharCode(97 + i)}
                </span>
                <span className="text-xs text-muted">Week {topic.week}</span>
              </div>
              <h3 className="mb-1 font-semibold">{topic.title}</h3>
              <p className="text-sm leading-relaxed text-muted">{topic.description}</p>
            </Card>
          </Link>
        ))}
      </div>
    </div>
  );
}