---
import BaseLayout from "./BaseLayout.astro";
import Remark42Embed from "@/components/Remark42Embed.astro";
import PostNav from "@/components/Posts/PostNav.astro";
import PostMenu from "@/components/Posts/PostMenu.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);
---

<BaseLayout
  pageTitle=`${frontmatter.title} - ${t.banner.title}`
  description={frontmatter.description}
  image={frontmatter.image?.url}
>
  <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">
          <em>{frontmatter.description}</em>
        </p>
        <p class="meta-line">
          {t.post.publishedOn}: {frontmatter.pubDate.toLocaleDateString()}
        </p>
        <p class="meta-line">{t.post.writtenBy}: {frontmatter.author}</p>

        <div class="tags" transition:name={`post-tags-${postId}`}>
          {
            frontmatter.tags.map((tag: string) => (
              <p class="tag">
                <a href={`/${lang}/tags/${tag}`}>{tag}</a>
              </p>
            ))
          }
        </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 id="image-preview-dialog" class="image-preview-dialog">
      <button class="image-preview-close" aria-label="关闭图片预览">×</button>
      <img id="image-preview-img" alt="" />
    </dialog>

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

    <h2>{comments}</h2>
    <Remark42Embed slug={slug} />
  </article>
</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 is:inline>
  function initImagePreview() {
    const dialog = document.getElementById("image-preview-dialog");
    const previewImg = document.getElementById("image-preview-img");
    const closeBtn = dialog?.querySelector(".image-preview-close");

    if (!dialog || !previewImg || !closeBtn) return;

    document.querySelectorAll("article img").forEach((img) => {
      if (img.dataset.previewBound === "true") return;
      img.dataset.previewBound = "true";

      img.addEventListener("click", () => {
        previewImg.src = img.currentSrc || img.src;
        previewImg.alt = img.alt || "";
        dialog.showModal();
      });
    });

    closeBtn.addEventListener("click", () => {
      dialog.close();
      previewImg.removeAttribute("src");
    });

    dialog.addEventListener("click", (event) => {
      if (event.target === dialog) {
        dialog.close();
        previewImg.removeAttribute("src");
      }
    });
  }

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

<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 updateProgress = () => {
    const doc = document.documentElement;
    const scrollTop = window.scrollY || doc.scrollTop;
    const scrollHeight = doc.scrollHeight - window.innerHeight;

    const progress = scrollHeight > 0 ? (scrollTop / scrollHeight) * 100 : 0;

    const bar = document.getElementById("reading-progress");
    if (bar) {
      bar.style.width = `${Math.min(progress, 100)}%`;
    }
  };

  updateProgress();
  window.addEventListener("scroll", updateProgress, { passive: true });
  window.addEventListener("resize", updateProgress);
  initFloatingActions();
  document.addEventListener("astro:page-load", initFloatingActions);
</script>

<style>
  #reading-progress {
    position: fixed;
    top: 0;
    left: 0;
    z-index: 9999;
    width: 0;
    height: 3px;
    background: #5a89ff;
    transition: width 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: #536493 1.5px solid;
    background: rgba(255, 255, 255, 0.92);
    color: #222;
    /* box-shadow: 0 4px 14px rgba(0, 0, 0, 0.16); */
    backdrop-filter: blur(6px);
    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(-2px);
  }

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

  :global(.dark) .back-button {
    background: rgba(34, 34, 34, 0.92);
    color: #f5f5f5;
    box-shadow: 0 4px 14px rgba(0, 0, 0, 0.32);
    border: #2f406d 2px solid;
  }

  @media (max-width: 640px) {
    .back-button {
      top: 1rem;
      left: 1rem;
      width: 2.75rem;
      height: 2.75rem;
    }
  }
  .post-content {
    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-weight: 400;
  }

  .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(--post-link-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;
  }

  .description {
    margin: 0 0 0.7rem 0;
    opacity: 0.9;
    line-height: 1.6;
    overflow-wrap: anywhere;
    word-break: break-word;
  }

  .meta-line {
    margin: 0.3rem 0;
    line-height: 1.6;
    overflow-wrap: anywhere;
    word-break: break-word;
  }

  .post-cover {
    width: 300px;
    height: auto;
    aspect-ratio: 16 / 10;
    object-fit: cover;
    object-position: center;
    /* border-radius: 0.4rem; */
    border: 1.5px #94a0ab dashed;
    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: 0.4rem;
    margin-top: 0.8rem;
    min-width: 0;
  }

  .tag {
    margin: 0;
    padding: 0.22em 0.65em;
    font-size: 0.88rem;
    line-height: 1.2;
    border: 1px dashed #8b6b4a;
    border-radius: 0;
    background-color: transparent;
    max-width: 100%;
  }

  .tag a {
    color: #6f4e37;
    text-decoration: none;
    overflow-wrap: anywhere;
    word-break: break-word;
  }

  .tag a:hover {
    text-decoration: underline;
  }

  :global(.dark) .tag {
    border-color: #d8c7a1;
  }

  :global(.dark) .tag a {
    color: #e6d8b8;
  }

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

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