---
// Import section components
import { SITE } from "@data/constants";
import MainLayout from "@/layouts/MainLayout.astro";
import { Image } from "astro:assets";
import { getCollection } from "astro:content";

// Use `getStaticPaths` to generate static routes for generated pages on build
export async function getStaticPaths() {
  const insightPosts = await getCollection("insights");
  return insightPosts.map((post) => ({
    params: { slug: post.slug },
    props: { post },
  }));
}

// Get the props for this page that define a specific insight post
const { post } = Astro.props;

const { Content } = await post.render();

const pageTitle: string = `${post.data.title} | ${SITE.title}`;
---

<MainLayout title={pageTitle}>
  <section class="py-6 sm:py-8 lg:py-12">
    <div class="mx-auto max-w-screen-xl px-4 md:px-8">
      <div class="grid gap-8 md:grid-cols-2 lg:gap-12">
        <div>
          <div class="h-64 overflow-hidden rounded-lg shadow-lg md:h-auto">
            <Image
              class="h-full w-full object-cover object-center"
              src={post.data.cardImage}
              alt={post.data.cardImageAlt}
              draggable={"false"}
              format={"avif"}
            />
          </div>
          <div
            id="progress-mobile"
            class="fixed left-0 top-0 h-2 w-full bg-gradient-to-r from-orange-400/30 to-orange-400 md:hidden"
          >
          </div>
          <div id="pin" class="mt-10 hidden space-y-4 md:block">
            <div
              class="h-px w-full overflow-hidden bg-neutral-300 dark:bg-neutral-700"
            >
              <div
                id="progress"
                class="h-px w-full bg-gradient-to-r from-orange-400/30 to-orange-400"
              >
              </div>
            </div>
            <p class="text-pretty text-sm font-light text-neutral-500">
              Table of Contents:
            </p>
            <div id="toc" class="">
              <ul
                class="space-y-2 text-pretty text-base text-neutral-700 transition duration-300 dark:text-neutral-400"
              >
              </ul>
            </div>
          </div>
        </div>

        <div class="md:pt-8">
          <h1
            class="mb-4 text-balance text-center text-2xl font-bold text-neutral-800 dark:text-neutral-200 sm:text-3xl md:mb-6 md:text-left"
          >
            {post.data.title}
          </h1>

          <article
            class="text-pretty text-lg text-neutral-700 dark:text-neutral-300"
          >
            <Content />
          </article>
        </div>
      </div>
    </div>
  </section>
</MainLayout>

<style is:global>
  :root {
    --transition-cubic: cubic-bezier(0.165, 0.84, 0.44, 1);
  }

  html {
    scroll-behavior: smooth;
  }

  article h2,
  article h3,
  article h4,
  article h5,
  article h6 {
    font-weight: bold;
    margin-top: 2.5rem;
    scroll-margin-top: 3rem;
  }

  h2 {
    font-size: 1.5rem;
    line-height: 2rem;
  }

  h3 {
    font-size: 1.25rem;
    line-height: 1.75rem;
  }

  h4 {
    font-size: 1.125rem;
    line-height: 1.75rem;
  }

  p {
    margin-top: 1.5rem;
  }

  #toc li {
    display: flex;
    align-items: center;
    opacity: 0.8;
    transition: all 300ms var(--transition-cubic);
  }

  #toc li.selected {
    opacity: 1;
  }

  #toc li svg {
    width: 0;
    height: 0;
    transition:
      height 400ms var(--transition-cubic),
      width 400ms var(--transition-cubic);
  }

  #toc li.selected svg {
    width: 1.25rem;
    height: 1.25rem;
    margin-right: 0.3rem;
  }
</style>

<script>
  const onScroll = (): void => {
    const article = document.querySelector("article");
    if (!article) return;

    const articleHeight = article.offsetHeight;
    const articleOffsetTop = article.offsetTop;

    const scrollTop = window.scrollY || document.documentElement.scrollTop;

    if (articleHeight && articleOffsetTop && scrollTop) {
      const progress =
        ((scrollTop - articleOffsetTop) /
          (articleHeight - window.innerHeight)) *
        100;

      const progressBar = document.getElementById("progress");
      const progressBarMobile = document.getElementById("progress-mobile");

      if (progressBar && progressBarMobile) {
        progressBar.style.width = `${progress}%`;
        progressBarMobile.style.width = `${progress}%`;
      }
    }
  };

  document.addEventListener("DOMContentLoaded", (event) => {
    window.onscroll = onScroll;

    // Set initial width of progress bar
    const progressBar = document.getElementById("progress");
    const progressBarMobile = document.getElementById("progress-mobile");

    if (progressBar && progressBarMobile) {
      progressBar.style.width = "0%";
      progressBarMobile.style.width = "0%";
    }
  });
</script>
<script>
  import { gsap } from "gsap";
  import { ScrollTrigger } from "gsap/ScrollTrigger";

  gsap.registerPlugin(ScrollTrigger);

  gsap.timeline({
    scrollTrigger: {
      scrub: 1,
      pin: true,
      trigger: "#pin",
      start: "top 20%",
      endTrigger: "footer",
      end: "top bottom",
    },
  });

  const SVG_HTML_STRING =
    '<svg class="w-0 h-0 flex-none" fill="none" viewBox="0 0 24 24" stroke-width="1.5" stroke="#fa5a15"><path stroke-linecap="round" stroke-linejoin="round" d="m12.75 15 3-3m0 0-3-3m3 3h-7.5M21 12a9 9 0 1 1-18 0 9 9 0 0 1 18 0Z"></svg>';

  function setActiveLinkById(id: string | null) {
    const listItems = document.querySelectorAll("#toc li");
    listItems.forEach((item) => item.classList.remove("selected"));

    if (!id) return;

    const activeLink = document.querySelector(`#toc a[href="#${id}"]`);

    if (!activeLink) return;

    const listItem = activeLink.parentElement;
    listItem?.classList.add("selected");
  }

  document.addEventListener("DOMContentLoaded", function () {
    // The article element that contains the Markdown content
    const article: HTMLElement | null = document.querySelector("article");
    // The ToC container <ul> element
    const tocList: HTMLElement | null = document.querySelector("#toc ul");

    const headings: NodeListOf<HTMLElement> | [] = article
      ? article.querySelectorAll("h1, h2, h3, h4, h5, h6")
      : [];

    headings.forEach((heading, i) => {
      if (heading instanceof HTMLElement) {
        const listItem = document.createElement("li");
        listItem.className = "toc-level-" + heading.tagName.toLowerCase();

        const tempDiv = document.createElement("div");
        tempDiv.innerHTML = SVG_HTML_STRING;

        const svg = tempDiv.firstChild;
        listItem.appendChild(svg as Node);

        const link = document.createElement("a");
        link.href = "#" + heading.id;
        link.textContent = heading.textContent;
        listItem.appendChild(link);

        tocList?.appendChild(listItem);

        gsap.timeline({
          scrollTrigger: {
            trigger: heading,
            start: "top 20%",
            end: () =>
              `bottom top+=${i === headings.length - 1 ? 0 : (headings[i + 1] as HTMLElement).getBoundingClientRect().height}`,
            onEnter: () => setActiveLinkById(heading.id),
            onLeaveBack: () =>
              setActiveLinkById((headings[i - 1] as HTMLElement)?.id),
          },
        });
      }
    });
  });
</script>