---
import { getCollection } from "astro:content";
import BaseLayout from "@/layouts/BaseLayout.astro";

export async function getStaticPaths() {
  const allPosts = await getCollection("posts", ({ data }) => !data.draft);
  const categories = [
    ...new Set(allPosts.map((p) => p.data.category).filter(Boolean)),
  ];
  return categories.map((cat) => ({
    params: { category: cat },
    props: {
      category: cat,
      posts: allPosts
        .filter((p) => p.data.category === cat)
        .sort((a, b) => b.data.date.getTime() - a.data.date.getTime()),
    },
  }));
}

const { category, posts } = Astro.props;

const allPosts = await getCollection("posts", ({ data }) => !data.draft);
const categories = [
  ...new Set(allPosts.map((p) => p.data.category).filter(Boolean)),
].sort();

const fmtDate = (d: Date) =>
  d.toLocaleDateString("en-US", {
    year: "numeric",
    month: "short",
    day: "numeric",
  });

const readTime = (body?: string) => {
  const words = body?.split(/\s+/).length ?? 0;
  return `~${Math.max(1, Math.round(words / 220))} mins`;
};

const excerpt = (body?: string, len = 140) => {
  if (!body) return "";
  const plain = body
    .replace(/^---[\s\S]*?---/, "")
    .replace(/[#*_`>\[\]()!|~\-]/g, "")
    .replace(/\n+/g, " ")
    .trim();
  return plain.length > len ? plain.slice(0, len).trimEnd() + " …" : plain;
};
---

<BaseLayout title={`${category} — Posts`} description={`Posts in the ${category} category`}>
  <div class="posts-page">
    <nav class="category-filters" aria-label="Filter by category">
      <a href="/posts/" class="filter-link">All</a>
      {categories.map((cat) => (
        <a
          href={`/posts/${cat}/`}
          class:list={["filter-link", { active: cat === category }]}
        >
          {cat}
        </a>
      ))}
    </nav>

    <div class="category-header">
      <h1 class="category-heading">{category}</h1>
      <p class="text-secondary">
        {posts.length} post{posts.length !== 1 ? "s" : ""}
      </p>
    </div>

    <ul class="post-list">
      {posts.map((post) => (
        <li class="post-entry">
          <a href={`/posts/${post.id}/`} class="post-row">
            <div class="post-thumb">
              {post.data.image ? (
                <img src={post.data.image} alt={post.data.title} class="thumb-img" loading="lazy" decoding="async" />
              ) : (
                <span class="thumb-placeholder">{post.data.title.charAt(0)}</span>
              )}
            </div>
            <div class="post-info">
              <div class="post-meta">
                <time datetime={post.data.date.toISOString()}>{fmtDate(post.data.date)}</time>
                <span>{readTime(post.body)}</span>
              </div>
              <h2 class="post-title">{post.data.title}</h2>
              {post.data.description ? (
                <p class="post-desc">{post.data.description}</p>
              ) : (
                <p class="post-desc">{excerpt(post.body)}</p>
              )}
            </div>
          </a>
        </li>
      ))}
    </ul>
  </div>
</BaseLayout>

<style>
  .posts-page {
    max-width: var(--max-w-page);
    margin-inline: auto;
  }

  .category-filters {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-2);
    padding-bottom: var(--space-4);
    margin-bottom: var(--space-4);
    position: sticky;
    top: var(--nav-height);
    z-index: 50;
    background-color: var(--bg);
  }

  .filter-link {
    display: inline-block;
    padding: var(--space-1) var(--space-4);
    font-size: var(--text-sm);
    font-weight: 500;
    border: 1px solid var(--border);
    border-radius: var(--radius-full);
    color: var(--text-muted);
    text-decoration: none;
    text-transform: capitalize;
    transition: all var(--duration-fast) var(--ease-out);
  }

  .filter-link:hover {
    border-color: var(--border-strong);
    color: var(--text);
  }

  .filter-link.active {
    background-color: var(--accent);
    border-color: var(--accent);
    color: white;
  }

  .category-header {
    margin-bottom: var(--space-6);
  }

  .category-heading {
    text-transform: capitalize;
    margin-bottom: var(--space-1);
  }

  .post-list {
    display: flex;
    flex-direction: column;
  }

  .post-entry {
    border-bottom: 1px solid var(--border);
  }

  .post-entry:first-child {
    border-top: 1px solid var(--border);
  }

  .post-row {
    display: grid;
    grid-template-columns: 160px 1fr;
    gap: var(--space-5);
    padding: var(--space-5) var(--space-2);
    text-decoration: none;
    color: inherit;
    border-radius: var(--radius-sm);
    transition: background-color var(--duration-fast) var(--ease-out);
  }

  .post-row:hover {
    background-color: var(--bg-surface-hover);
  }

  .post-thumb {
    aspect-ratio: 3 / 2;
    border-radius: var(--radius-md);
    overflow: hidden;
    background-color: var(--bg-surface-hover);
  }

  .thumb-img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    filter: grayscale(100%);
    transition: filter var(--duration-normal) var(--ease-out);
  }

  .post-row:hover .thumb-img {
    filter: grayscale(0%);
  }

  .thumb-placeholder {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 100%;
    height: 100%;
    font-size: var(--text-2xl);
    font-weight: 700;
    color: var(--text-muted);
    opacity: 0.3;
  }

  .post-info {
    display: flex;
    flex-direction: column;
    justify-content: center;
    gap: var(--space-2);
    min-width: 0;
  }

  .post-meta {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    font-size: var(--text-xs);
    color: var(--text-muted);
  }

  .post-title {
    font-size: var(--text-lg);
    font-weight: 600;
    line-height: var(--leading-tight);
  }

  .post-desc {
    font-size: var(--text-sm);
    color: var(--text-secondary);
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
    line-height: var(--leading-relaxed);
  }

  @media (max-width: 600px) {
    .post-row {
      grid-template-columns: 1fr;
      gap: var(--space-3);
    }

    .post-thumb {
      aspect-ratio: 16 / 9;
    }

    .post-title {
      font-size: var(--text-base);
    }
  }
</style>