---
import { Icon } from "astro-icon/components";

const videos = [
  {
    author: "outfoxxed",
    authorlink: "https://outfoxxed.me",
    path: "/assets/showcase/outfoxxed.mp4",
  },
  {
    author: "flicko",
    authorlink: "https://github.com/flick0",
    path: "/assets/showcase/flicko.mp4",
  },
  {
    author: "vaxry",
    authorlink: "https://vaxry.net",
    path: "/assets/showcase/vaxry.mp4",
  },
];
---
<div class="marquee">
  <div class="marquee-scroll">
    <div class="marquee-item-spacing">
      <div id="marquee-scroll-left" class="marquee-scroll-arrow">
        <div><Icon name="caret-left"/></div>
      </div>
      <div id="marquee-scroll-right" class="marquee-scroll-arrow">
        <div><Icon name="caret-right"/></div>
      </div>
    </div>
  </div>
  <div id="marquee-content" class="marquee-content" data-scroll="0" data-media-index="0">
    {videos.map(({ author, authorlink, path }, index) => <div class="marquee-item">
      <div>
        <video
          data-media-index={index}
          data-media-author={author}
          id="showcase-video"
          class="marquee-item-spacing marquee-item-content"
          muted
          controls
          playsinline
        >
          <source src={path} type="video/mp4"/>
        </video>
        <p>Configuration by <a href={authorlink}>{author}</a></p>
      </div>
    </div>)}
  </div>
</div>

<script>
  // marquee
  const dataNum = 2; // last array index
  const marquee = document.getElementById("marquee-content")!;
  marquee.style.setProperty("--scroll", "0")

  // autoplay
  window.addEventListener("load", autoplayInit,false);
  const videos = document.getElementsByClassName("marquee-item-content") as HTMLCollectionOf<HTMLVideoElement>;

  function autoplayInit() {
    videos[0].play();
    videos[0].setAttribute("data-active", "");
  };

  const intersectionOptions = {
    root: marquee,
    rootMargin: "0px",
    threshold: 0.0,
  };

  const observer = new IntersectionObserver((entries) => {
    entries.forEach((entry) => {
      const video = entry.target as HTMLVideoElement;
      if (!entry.isIntersecting) {
        video.pause();
        video.removeAttribute("autoplay")
        video.removeAttribute("data-active")
        video.currentTime = 0;
      } else {
        video.play();
        video.setAttribute("data-active","")
      }
    });
  },intersectionOptions);

  for (const video of videos) {
    observer.observe(video);
    video.addEventListener("ended", onVideoEnded)
  }

  const onVisibilityChange = () => {
    for(const video of videos){
      if(document.hidden){
        video.pause();
      } else {
        video.play();
      }
    }
  }
  document.addEventListener("visibilitychange", onVisibilityChange);


  function onVideoEnded() {
    const currentIndex = marquee.getAttribute("data-media-index");
    const currentIndexNum = Number(currentIndex);
    if(currentIndexNum !== dataNum){
      const newIndex = currentIndexNum + 1;
      marquee.setAttribute("data-media-index", `${newIndex}`);
      marquee.style.setProperty("--scroll", `-${newIndex*100}%`)
    } else {
      marquee.setAttribute("data-media-index", "0");
      marquee.style.setProperty("--scroll", "0")
    }
  }

  // left-right buttons
  const scrollLeft = document.getElementById("marquee-scroll-left")!;
  const scrollRight = document.getElementById("marquee-scroll-right")!;
  const scrollMaxPercent = dataNum*100;

  scrollLeft.addEventListener("mousedown", () => {
    const dataScroll = marquee.getAttribute("data-scroll")!;
    const hashMap = {
      "first": () => {
        const scrollToLast = `-${scrollMaxPercent}%`;
        marquee.setAttribute("data-scroll", scrollToLast);
      },
      "lt0": () => {
        const oldDataScroll = marquee.getAttribute("data-scroll")!.slice(1, -1);
        const oldNumScroll = Number(oldDataScroll)
        const newScroll = oldNumScroll - 100;
        newScroll <= scrollMaxPercent && newScroll > 0 ?
          marquee.setAttribute("data-scroll",`-${newScroll.toString()}%`)
          : marquee.setAttribute("data-scroll", "0")
      }
    }

    hashMap[dataScroll === "0" ?
      "first"
      : "lt0"
    ]()
    const updatedScroll = marquee.getAttribute("data-scroll")!;
    const mediaIndex = updatedScroll.indexOf("%") !== -1 ? updatedScroll.slice(1, -3) : "0";
    marquee.setAttribute("data-media-index", mediaIndex);
    marquee.style.setProperty("--scroll", updatedScroll)
  })

  scrollRight.addEventListener("mousedown", () => {
    const dataScroll = marquee.getAttribute("data-scroll")!;
    const hashMap = {
      "last": () => {
        const scrollToFirst = "0";
        marquee.setAttribute("data-scroll", scrollToFirst);
      },
      "mt0": () => {
        const oldDataScroll = marquee.getAttribute("data-scroll")!.slice(1, -1);
        const oldNumScroll = Number(oldDataScroll)
        const newScroll = oldNumScroll + 100;
        newScroll <= scrollMaxPercent ?
          marquee.setAttribute("data-scroll",`-${newScroll.toString()}%`)
          : marquee.setAttribute("data-scroll", "0")
      }
    }

    hashMap[dataScroll === `${scrollMaxPercent}` ?
      "last"
      : "mt0"
    ]()
    const updatedScroll = marquee.getAttribute("data-scroll")!;
    const mediaIndex = updatedScroll.indexOf("%") !== -1 ? updatedScroll.slice(1, -3) : "0";
    marquee.setAttribute("data-media-index", mediaIndex);
    marquee.style.setProperty("--scroll", updatedScroll);
  })
</script>