---
import Icon from "../icons/Icon.astro";
---

<button
  type="button"
  class="focus-visible:ring-secondary group inline-flex items-center rounded-lg p-2.5 text-neutral-600 outline-none ring-zinc-500 transition duration-300 hover:bg-neutral-100 focus:outline-none focus-visible:outline-none focus-visible:ring-1 dark:text-neutral-400 dark:ring-zinc-200 dark:hover:bg-neutral-700"
  data-bookmark-button="bookmark-button"
>
  <Icon name="bookmark" />
</button>

<script>
  class Bookmark {
    private static readonly BOOKMARKS_KEY = "bookmarks";
    private bookmarkButton: Element | null;

    constructor(private dataAttrValue: string) {
      this.bookmarkButton = document.querySelector(
        `[data-bookmark-button="${dataAttrValue}"]`
      );
    }

    private getStoredBookmarks(): string[] {
      const item = localStorage.getItem(Bookmark.BOOKMARKS_KEY);
      return item ? JSON.parse(item) : [];
    }

    init(): void {
      if (this.bookmarkButton && this.isStored()) {
        this.markAsStored();
      }

      this.bookmarkButton?.addEventListener("click", () =>
        this.toggleBookmark()
      );
    }

    isStored(): boolean {
      return this.getStoredBookmarks().includes(window.location.pathname);
    }
    markAsStored(): void {
      if (this.bookmarkButton) {
        this.bookmarkButton.classList.add("bookmarked");
        let svgElement = this.bookmarkButton.querySelector("svg");
        if (svgElement) {
          svgElement.setAttribute(
            "class",
            "h-6 w-6 fill-red-500 dark:fill-red-500"
          );
        }
        let pathElement = svgElement?.querySelector("path");
        if (pathElement) {
          pathElement.setAttribute(
            "class",
            "fill-current text-red-500 dark:text-red-500"
          );
        }
      }
    }
    unmarkAsStored(): void {
      if (this.bookmarkButton) {
        this.bookmarkButton.classList.remove("bookmarked");
        let svgElement = this.bookmarkButton.querySelector("svg");
        if (svgElement) {
          svgElement.setAttribute("class", "h-6 w-6 fill-none");
        }
        let pathElement = svgElement?.querySelector("path");
        if (pathElement) {
          pathElement.setAttribute(
            "class",
            "fill-current text-neutral-500 group-hover:text-red-400 dark:text-neutral-500 group-hover:dark:text-red-400"
          );
        }
      }
    }
    toggleBookmark(): void {
      let storedBookmarks = this.getStoredBookmarks();
      const index = storedBookmarks.indexOf(window.location.pathname);
      if (index !== -1) {
        storedBookmarks.splice(index, 1);
        this.unmarkAsStored();
      } else {
        storedBookmarks.push(window.location.pathname);
        this.markAsStored();
      }
      localStorage.setItem(
        Bookmark.BOOKMARKS_KEY,
        JSON.stringify(storedBookmarks)
      );
    }
  }

  new Bookmark("bookmark-button").init();
</script>