---
import BaseLayout from "./BaseLayout.astro";
import Remark42Embed from "@/components/Remark42Embed.astro";
import PostNav from "@/components/Posts/PostNav.astro";
import TagLink from "@/components/TagLink.astro";
import PostMenu from "@/components/Posts/PostMenu.astro";
import Dialog from "@/components/Posts/Dialog.astro";
import { fade } from "astro:transitions";
import { getTranslations } from "@/i18n";
import "@/styles/global.css";

const { post, frontmatter, lang, slug, postId, headings } = Astro.props;
const comments = lang === "zh" ? "评论区" : "comments";
const t = getTranslations(lang);
const publishedDate = new Intl.DateTimeFormat(
  lang === "zh" ? "zh-CN" : "en-US",
  {
    year: "numeric",
    month: "long",
    day: "numeric",
  },
).format(frontmatter.pubDate);
---

<BaseLayout
  pageTitle=`${frontmatter.title} - ${t.banner.title}`
  description={frontmatter.description}
  image={frontmatter.image?.url}
>
  <div class="post-layout page-shell">
    <div id="reading-progress" aria-hidden="true"></div>
    <a
      href="/"
      class="back-button"
      id="back-button"
      aria-label="Go back"
      title="返回"
    >
      <svg
        viewBox="0 0 24 24"
        width="20"
        height="20"
        fill="none"
        stroke="currentColor"
        stroke-width="2.2"
        stroke-linecap="round"
        stroke-linejoin="round"
        aria-hidden="true"
      >
        <path d="M15 18l-6-6 6-6"></path>
      </svg>
    </a>

    <PostMenu headings={headings} />

    <article class="post-article">
      <div class="post-header">
        <div class="post-meta">
          <h1 class="post-title" transition:name={`post-title-${postId}`}>
            {frontmatter.title}
          </h1>
          <p class="description">
            {frontmatter.description}
          </p>
          <p class="post-byline">
            <span>{t.post.writtenBy} {frontmatter.author}</span>
            <span class="byline-separator" aria-hidden="true">·</span>
            <time datetime={frontmatter.pubDate.toISOString()}>
              {t.post.publishedOn} {publishedDate}
            </time>
          </p>

          <div class="tags" transition:name={`post-tags-${postId}`}>
            {
              frontmatter.tags.map((tag: string) => (
                <TagLink tag={tag} lang={lang} />
              ))
            }
          </div>
        </div>

        <img
          src={frontmatter.image.url}
          alt={frontmatter.image.alt}
          class="post-cover"
          transition:name={`post-image-${postId}`}
        />
      </div>

      <div class="post-divider"></div>

      <div class="post-content" transition:animate={fade({ duration: "0.2s" })}>
        <slot />
      </div>

      <Dialog />

      <PostNav post={post} lang={lang} />

      <section
        id="comments"
        class="comments-section"
        aria-labelledby="comments-heading"
      >
        <h2 id="comments-heading">{comments}</h2>
        {t.post.commentsDesc.map((line: string) => <p set:html={line} />)}
        <Remark42Embed slug={slug} />
      </section>
    </article>
  </div>
</BaseLayout>

<script
  type="application/ld+json"
  set:html={JSON.stringify({
    "@context": "https://schema.org",
    "@type": "BlogPosting",
    headline: frontmatter.title,
    description: frontmatter.description,
    image: frontmatter.image
      ? [
          new URL(
            frontmatter.image.url ?? frontmatter.image,
            Astro.site,
          ).toString(),
        ]
      : undefined,
    datePublished: frontmatter.pubDate,
    dateModified: frontmatter.updatedDate ?? frontmatter.pubDate,
    author: {
      "@type": "Person",
      name: "CLoverta",
    },
    mainEntityOfPage: {
      "@type": "WebPage",
      "@id": new URL(Astro.url.pathname, Astro.site).toString(),
    },
  })}
/>

<script>
  const initFloatingActions = () => {
    const backButton = document.getElementById("back-button");

    if (backButton && backButton.dataset.bound !== "true") {
      const toggleBackButton = () => {
        if (window.scrollY > 300) {
          backButton.classList.add("show");
        } else {
          backButton.classList.remove("show");
        }
      };

      backButton.addEventListener("click", () => {
        if (window.history.length > 1) {
          window.history.back();
        } else {
          window.location.href = "/";
        }
      });

      window.addEventListener("scroll", toggleBackButton, {
        passive: true,
      });
      toggleBackButton();
      backButton.dataset.bound = "true";
    }
  };
  const initReadingProgress = () => {
    const readingWindow = window as typeof window & {
      __postReadingProgressHandler?: () => void;
    };

    if (readingWindow.__postReadingProgressHandler) {
      window.removeEventListener(
        "scroll",
        readingWindow.__postReadingProgressHandler,
      );
      window.removeEventListener(
        "resize",
        readingWindow.__postReadingProgressHandler,
      );
    }

    const bar = document.getElementById("reading-progress");
    const content = document.querySelector<HTMLElement>(".post-content");
    if (!bar || !content) return;

    // Keep the fixed progress bar outside Astro's animated page container.
    // Otherwise the header's transformed compositor layer can paint above it.
    if (bar.parentElement !== document.body) {
      document.body.appendChild(bar);
    }

    const updateProgress = () => {
      const contentTop = content.getBoundingClientRect().top + window.scrollY;
      const readableDistance = Math.max(
        content.scrollHeight - window.innerHeight,
        1,
      );
      const progress = Math.min(
        Math.max((window.scrollY - contentTop) / readableDistance, 0),
        1,
      );

      bar.style.transform = `scaleX(${progress})`;
    };

    readingWindow.__postReadingProgressHandler = updateProgress;
    window.addEventListener("scroll", updateProgress, { passive: true });
    window.addEventListener("resize", updateProgress);
    updateProgress();
  };

  initReadingProgress();
  initFloatingActions();
  document.addEventListener("astro:page-load", initReadingProgress);
  document.addEventListener("astro:page-load", initFloatingActions);
</script>

<style>
  .post-layout {
    min-width: 0;
  }

  #reading-progress {
    position: fixed;
    top: 0;
    left: 0;
    z-index: 9999;
    width: 100%;
    height: 3px;
    background: #5a89ff;
    transform: scaleX(0);
    transform-origin: left center;
    transition: transform 0.08s linear;
    pointer-events: none;
  }

  .back-button {
    position: fixed;
    top: 1.25rem;
    left: 1.25rem;
    width: 3rem;
    height: 3rem;
    border-radius: 999px;
    display: flex;
    align-items: center;
    justify-content: center;
    text-decoration: none;
    border-top: #536493 1.5px dotted;
    border-left: #536493 1.5px dotted;
    border-right: #536493 2.5px solid;
    border-bottom: #536493 2.5px solid;
    background: color-mix(in srgb, var(--background-color) 94%, transparent);
    color: #222;
    z-index: 1000;
    visibility: hidden;
    transform: translateY(-80px);
    /* opacity: 0; */
    transition:
      opacity 0.2s ease,
      transform 0.27s ease,
      visibility 0.2s ease,
      box-shadow 0.2s ease,
      background 0.2s ease,
      color 0.2s ease;
  }

  .back-button.show {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
  }

  .back-button.show:hover {
    transform: translateY(-2.5px);
    box-shadow: 2px 3px 0px var(--deep-blue);
  }

  .back-button:hover {
    transform: translateY(-2px);
  }

  :global(.dark) .back-button {
    background: color-mix(
      in srgb,
      var(--background-color-dark) 94%,
      transparent
    );
    color: #f5f5f5;
    border-top-color: #515151;
    border-left-color: #515151;
    border-right-color: #515151;
    border-bottom-color: #515151;
  }

  @media (max-width: 640px) {
    .back-button {
      top: 1rem;
      left: 1rem;
      width: 2.75rem;
      height: 2.75rem;
    }
  }
  .post-content {
    --article-muted: #596672;
    --article-rule: rgba(83, 100, 147, 0.25);
    --article-tint: rgba(83, 100, 147, 0.045);
    font-family:
      system-ui,
      -apple-system,
      BlinkMacSystemFont,
      "Segoe UI",
      "PingFang SC",
      "Hiragino Sans GB",
      "Microsoft YaHei",
      "Noto Sans CJK SC",
      "Source Han Sans SC",
      sans-serif;
    font-size: 1.07rem;
    font-weight: 400;
    line-height: 1.85;
    overflow-wrap: break-word;
  }

  .post-content :global(> :first-child) {
    margin-top: 0;
  }

  .post-content :global(p) {
    margin-block: 1.05em;
  }

  .post-content :global(h2) {
    margin: 3.2rem 0 1rem;
    font-family: "Noto Sans SC", system-ui, sans-serif;
    font-size: clamp(1.35rem, 2vw, 1.55rem);
    line-height: 1.4;
    text-wrap: balance;
  }

  .post-content :global(h3) {
    margin: 2.25rem 0 0.8rem;
    font-family: "Noto Sans SC", system-ui, sans-serif;
    font-size: clamp(1.12rem, 1.6vw, 1.28rem);
    line-height: 1.45;
    text-wrap: balance;
  }

  .post-content :global(h4) {
    margin: 1.8rem 0 0.65rem;
    font-family: "Noto Sans SC", system-ui, sans-serif;
    line-height: 1.5;
    font-size: 1.05em;
  }

  .post-content :global(:is(h2, h3, h4) + :is(h3, h4, p, ul, ol)) {
    margin-top: 0.7rem;
  }

  .post-content :global(ul),
  .post-content :global(ol) {
    margin-block: 1.1em;
    padding-inline-start: 1.6em;
  }

  .post-content :global(li::marker) {
    color: var(--article-muted);
    font-variant-numeric: tabular-nums;
  }

  .post-content :global(li > p) {
    margin-block: 0.45em;
  }

  .post-content :global(li > :is(ul, ol)) {
    margin-block: 0.5em;
  }

  .post-content :global(li + li) {
    margin-top: 0.35rem;
  }

  .post-content :global(img:not(.code-copy-icon)) {
    display: block;
    max-width: 100%;
    height: auto;
    margin-inline: auto;
  }

  .post-content :global(figure) {
    margin: 2rem 0;
  }

  .post-content :global(figcaption) {
    margin-top: 0.55rem;
    color: var(--article-muted);
    font-family: "Noto Sans SC", system-ui, sans-serif;
    font-size: 0.78rem;
    line-height: 1.5;
    text-align: center;
  }

  .post-content :global(table) {
    display: block;
    max-width: 100%;
    overflow-x: auto;
    margin-block: 1.75rem;
    border-collapse: collapse;
    font-size: 0.9em;
    line-height: 1.65;
  }

  .post-content :global(th),
  .post-content :global(td) {
    padding: 0.65rem 0.85rem;
    border-bottom: 1px solid var(--article-rule);
    vertical-align: top;
  }

  .post-content :global(th) {
    background: var(--article-tint);
    font-weight: 600;
  }

  .post-content :global(a) {
    text-decoration: underline;
    text-decoration-thickness: 1px;
    text-underline-offset: 0.2em;
    text-decoration-color: color-mix(in srgb, currentColor 45%, transparent);
  }

  .post-content :global(a:hover) {
    text-decoration-color: currentColor;
  }

  .post-content :global(:is(a, summary):focus-visible) {
    outline: 2px solid var(--deep-blue);
    outline-offset: 3px;
  }

  .post-content :global(hr) {
    margin-block: 2.5rem;
    border: 0;
    border-top: 1px dashed var(--article-rule);
  }

  .post-content :global(code),
  .post-content :global(pre),
  .post-content :global(kbd),
  .post-content :global(samp) {
    font-family: "Maple Mono", "Maple Mono CN", monospace;
  }

  a {
    color: var(--url-color);
  }

  .post-header {
    display: grid;
    grid-template-columns: minmax(0, 1fr) 300px;
    align-items: start;
    gap: 1.5rem;
    margin-bottom: 1.5rem;
  }

  .post-meta {
    min-width: 0;
  }

  .post-title {
    margin: 0 0 0.5rem 0;
    line-height: 1.25;
    overflow-wrap: anywhere;
    word-break: break-word;
    text-wrap: balance;
  }

  .description {
    margin: 0 0 0.7rem 0;
    color: #596672;
    font-weight: 400;
    line-height: 1.6;
    overflow-wrap: anywhere;
    word-break: break-word;
  }

  .post-byline {
    display: flex;
    flex-wrap: wrap;
    align-items: baseline;
    gap: 0.3rem 0.55rem;
    margin: 0.3rem 0;
    color: #66717c;
    font-family: "Noto Sans SC", system-ui, sans-serif;
    font-size: 0.8rem;
    font-weight: 400;
    line-height: 1.5;
    overflow-wrap: anywhere;
    word-break: break-word;
  }

  .byline-separator {
    opacity: 0.65;
  }

  :global(html.dark) .post-byline {
    color: #aab7c4;
  }

  :global(html.dark) .description {
    color: #b5bec7;
  }

  @media (min-width: 701px) {
    .post-title {
      margin-bottom: 0.85rem;
      font-size: clamp(1.7rem, 2.2vw, 2rem);
      line-height: 1.4;
    }

    .description {
      margin-bottom: 1rem;
      font-size: 1rem;
    }
  }

  .post-cover {
    width: 300px;
    height: auto;
    aspect-ratio: 16 / 10;
    object-fit: cover;
    object-position: center;
    display: block;
  }

  .post-divider {
    border-top: 1px dashed #dfe4e9;
    margin: 1.2rem 0 1.5rem;
  }

  :global(.dark) .post-divider {
    border-top-color: #7f91a3;
  }

  .tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.25rem 0.9rem;
    margin-top: 0.8rem;
    min-width: 0;
    font-size: 0.88rem;
  }

  @media (max-width: 560px) {
    .post-header {
      grid-template-columns: 1fr;
    }

    .post-cover {
      width: 100%;
      max-width: 100%;
      aspect-ratio: 16 / 9;
    }
  }

  .post-content :global(details) {
    margin: 1.5rem 0;
    overflow: hidden;
    border-top: 1px solid var(--article-rule);
    border-bottom: 1px solid var(--article-rule);
    border-radius: 0;
    background: var(--article-tint);
  }

  .post-content :global(details summary) {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.8rem 0.9rem;
    cursor: pointer;
    font-weight: 600;
    user-select: none;
    list-style: none;
  }

  .post-content :global(details summary::-webkit-details-marker) {
    display: none;
  }

  .post-content :global(details summary::before) {
    content: "›";
    display: inline-block;
    font-size: 1.25rem;
    line-height: 1;
    transition: transform 0.2s ease;
  }

  .post-content :global(details[open] summary::before) {
    transform: rotate(90deg);
  }

  /* 展开内容 */
  .post-content :global(details > :not(summary)) {
    box-sizing: border-box;
    margin: 0.8rem 1rem;
    padding: 0;
  }

  /* 为列表序号预留空间 */
  .post-content :global(details > ol),
  .post-content :global(details > ul) {
    padding-inline-start: 1.6em;
  }

  .post-content :global(details li) {
    margin: 0.8rem 0;
  }

  .post-content :global(blockquote) {
    margin: 1.5rem 0;
    padding: 0.15rem 0 0.15rem 1rem;
    border-left: 3px solid var(--deep-blue);
    color: var(--article-muted);
    background: transparent;
    border-radius: 0;
  }

  .post-content :global(blockquote p) {
    margin: 0;
  }

  .post-content :global(blockquote p + p) {
    margin-top: 0.75rem;
  }

  /* 块级公式：超出屏幕时只滚动公式，不撑宽整篇文章 */
  .post-content :global(.katex-display) {
    max-width: 100%;
    overflow-x: auto;
    overflow-y: hidden;
    padding: 0.25rem 0;
    -webkit-overflow-scrolling: touch;
  }

  /* 避免 KaTeX 内部元素强行把父容器撑宽 */
  .post-content :global(.katex-display > .katex) {
    min-width: max-content;
  }

  .comments-section {
    scroll-margin-top: 5rem;
  }

  :global(html.dark) .post-content {
    --article-muted: #aab7c4;
    --article-rule: rgba(170, 183, 196, 0.28);
    --article-tint: rgba(170, 183, 196, 0.055);
  }

  :global(html.dark) .post-content :global(blockquote) {
    border-left-color: #9ecbff;
  }

  @media (prefers-reduced-motion: reduce) {
    #reading-progress {
      transition: none;
    }
  }
</style>