---
import BaseLayout from "../../../layouts/BaseLayout.astro";
import { getCollection, type CollectionEntry } from "astro:content";
import { formatBlogDate, getTagHref, slugifyTag } from "../../../lib/blog";
import { getReadingTime } from "../../../lib/readingTime";

type BlogPost = CollectionEntry<"blog">;

export async function getStaticPaths() {
    const posts = await getCollection("blog", ({ data }) => !data.draft);
    const tagMap = new Map<string, { tag: string; posts: BlogPost[] }>();

    for (const post of posts) {
        for (const tag of post.data.tags) {
            const slug = slugifyTag(tag);
            const existing = tagMap.get(slug);

            if (existing) {
                existing.posts.push(post);
            } else {
                tagMap.set(slug, { tag, posts: [post] });
            }
        }
    }

    return [...tagMap.entries()].map(([slug, entry]) => ({
        params: { tag: slug },
        props: {
            tag: entry.tag,
            posts: entry.posts.sort(
                (a, b) => b.data.pubDate.valueOf() - a.data.pubDate.valueOf(),
            ),
        },
    }));
}

const { tag, posts } = Astro.props as {
    tag: string;
    posts: BlogPost[];
};

const previewPosts = posts.map((post) => ({
    ...post,
    readingTime: getReadingTime(post.body),
}));
---

<BaseLayout
    title={`Tag: ${tag} - Hidden Den Cafe`}
    description={`Blog posts tagged ${tag} on Hidden Den.`}
>
    <div class="matrix-bg" aria-hidden="true"></div>

    <main class="main">
        <div class="container">
            <header class="header fade-in">
                <p class="eyebrow">Blog tag</p>
                <h1 class="title">{tag}</h1>
                <div class="divider">==============================</div>
                <p class="lead">
                    Posts filed under <span class="highlight">{tag}</span>. A
                    small cluster of related thoughts from the den.
                </p>
            </header>

            <section class="section fade-in" aria-labelledby="tag-posts">
                <div class="section-head">
                    <h2 id="tag-posts">Posts</h2>
                    <a class="section-link" href="/blog">Back to blog</a>
                </div>
                <ul class="post-list">
                    {previewPosts.map((post) => (
                        <li class="post-item">
                            <div class="post-meta-column">
                                <time
                                    class="post-date"
                                    datetime={formatBlogDate(post.data.pubDate)}
                                >
                                    {formatBlogDate(post.data.pubDate)}
                                </time>
                                <span class="post-reading-time">
                                    {post.readingTime.text}
                                </span>
                            </div>
                            <div class="post-info">
                                <a
                                    href={`/blog/${post.slug}`}
                                    class="post-title"
                                >
                                    {post.data.title}
                                </a>
                                <p class="post-desc">{post.data.description}</p>
                                {post.data.tags.length > 0 && (
                                    <div
                                        class="tag-list"
                                        aria-label={`${post.data.title} tags`}
                                    >
                                        {post.data.tags.map((entryTag) => (
                                            <a
                                                class:list={[
                                                    "tag",
                                                    {
                                                        active:
                                                            entryTag === tag,
                                                    },
                                                ]}
                                                href={getTagHref(entryTag)}
                                            >
                                                {entryTag}
                                            </a>
                                        ))}
                                    </div>
                                )}
                            </div>
                        </li>
                    ))}
                </ul>
            </section>

            <footer class="footer fade-in">
                <p>Made with love by Latte</p>
            </footer>
        </div>
    </main>
</BaseLayout>

<style>
    .matrix-bg {
        position: fixed;
        top: 0;
        left: 0;
        width: 100%;
        height: 100%;
        z-index: -1;
        opacity: 0.03;
        background:
            linear-gradient(var(--color-accent) 1px, transparent 1px),
            linear-gradient(90deg, var(--color-accent) 1px, transparent 1px);
        background-size: 50px 50px;
        animation: grid-move 20s linear infinite;
    }

    @keyframes grid-move {
        0% {
            transform: translate(0, 0);
        }
        100% {
            transform: translate(50px, 50px);
        }
    }

    .main {
        min-height: 100vh;
        display: flex;
        align-items: center;
        justify-content: center;
        padding: var(--space-lg) var(--space-md);
        padding-top: calc(var(--space-lg) + 3rem);
    }

    .container {
        max-width: 700px;
        width: 100%;
        background: var(--color-glass);
        backdrop-filter: blur(10px);
        border: 1px solid var(--color-surface);
        border-radius: 8px;
        padding: var(--space-xl);
    }

    .header {
        text-align: center;
        margin-bottom: var(--space-lg);
    }

    .eyebrow {
        color: var(--color-text-dim);
        text-transform: uppercase;
        letter-spacing: 0.24em;
        font-size: 0.75rem;
        margin-bottom: var(--space-sm);
    }

    .title {
        font-size: 2rem;
        font-weight: 700;
        letter-spacing: 2px;
    }

    .divider {
        color: var(--color-surface);
        text-align: center;
        font-size: 0.75rem;
        margin: var(--space-md) 0;
        user-select: none;
    }

    .lead {
        color: var(--color-text-dim);
        line-height: 1.8;
        max-width: 38rem;
        margin: 0 auto;
    }

    .highlight {
        color: var(--color-accent-bright);
        font-weight: 700;
    }

    .section {
        margin: var(--space-md) 0;
    }

    .section-head {
        display: flex;
        align-items: baseline;
        justify-content: space-between;
        gap: var(--space-sm);
        margin-bottom: var(--space-md);
    }

    .section-head h2 {
        font-size: 1rem;
        text-transform: uppercase;
        letter-spacing: 2px;
        color: var(--color-accent);
    }

    .section-link {
        color: var(--color-blue);
        font-size: 0.85rem;
        white-space: nowrap;
    }

    .section-link:hover {
        color: var(--color-accent-bright);
    }

    .post-list {
        list-style: none;
        display: flex;
        flex-direction: column;
        gap: var(--space-md);
    }

    .post-item {
        display: flex;
        gap: var(--space-md);
        align-items: flex-start;
    }

    .post-meta-column {
        min-width: 110px;
        display: flex;
        flex-direction: column;
        gap: 2px;
    }

    .post-date {
        color: var(--color-text-dim);
        font-size: 0.8rem;
        white-space: nowrap;
        padding-top: 2px;
    }

    .post-reading-time {
        color: var(--color-accent);
        font-size: 0.72rem;
        white-space: nowrap;
    }

    .post-info {
        display: flex;
        flex-direction: column;
        gap: var(--space-xs);
    }

    .post-title {
        color: var(--color-blue);
        font-size: 1rem;
        font-weight: 700;
    }

    .post-title:hover {
        color: var(--color-accent-bright);
    }

    .post-desc {
        color: var(--color-text-dim);
        font-size: 0.85rem;
        line-height: 1.6;
    }

    .tag-list {
        display: flex;
        flex-wrap: wrap;
        gap: var(--space-xs);
    }

    .tag {
        font-size: 0.72rem;
        color: var(--color-accent);
        border: 1px solid var(--color-surface);
        padding: 1px 6px;
        border-radius: 999px;
        text-decoration: none;
    }

    .tag:hover,
    .tag.active {
        color: var(--color-accent-bright);
        border-color: color-mix(in srgb, var(--color-accent) 45%, transparent);
    }

    .footer {
        margin-top: var(--space-xl);
        text-align: center;
    }

    .footer p {
        color: var(--color-text-dim);
        font-size: 0.85rem;
    }

    .fade-in {
        animation: fadeIn 0.6s ease-out forwards;
        opacity: 0;
    }

    .fade-in:nth-child(1) {
        animation-delay: 0.1s;
    }

    .fade-in:nth-child(2) {
        animation-delay: 0.2s;
    }

    .fade-in:nth-child(3) {
        animation-delay: 0.3s;
    }

    @keyframes fadeIn {
        from {
            opacity: 0;
            transform: translateY(10px);
        }
        to {
            opacity: 1;
            transform: translateY(0);
        }
    }

    @media (max-width: 600px) {
        .container {
            padding: var(--space-md);
        }

        .title {
            font-size: 1.5rem;
        }

        .divider {
            font-size: 0.6rem;
        }

        .lead {
            font-size: 0.95rem;
        }

        .section-head {
            flex-direction: column;
            align-items: flex-start;
        }

        .post-item {
            flex-direction: column;
            gap: var(--space-xs);
        }

        .post-meta-column {
            min-width: unset;
        }
    }

    @media (prefers-reduced-motion: reduce) {
        .matrix-bg {
            animation: none;
        }

        .fade-in {
            animation: none;
            opacity: 1;
        }
    }
</style>
