<template>
  <div>
    <video
      ref="playerfake"
      muted
      autoplay
      style="display: none"
      :src="vidWrs"
    />
    <!-- Scrubber -->
    <v-slider
      id="scrubber"
      hide-details
      height="2"
      dense
      :disabled="disabled"
      color="transparent"
      thumb-color="primary"
      track-color="transparent"
      :class="!controls && !fullscreen && !seeking ? 'invisible' : ''"
      style="position: absolute; z-index: 69420"
      :style="
        fullscreen
          ? 'width: calc(100% - 2rem); left: 1rem; bottom: 55px;'
          : 'width: calc(100% - 0.5rem); left: 0.25rem; bottom: 0;'
      "
      :thumb-size="0"
      :max="duration"
      :value="currentTime"
      @start="$emit('seeking')"
      @end="$emit('seeking')"
      @change="$emit('scrub', $event)"
      @input="seeking ? seek($event) : null"
    >
      <template #thumb-label="{ value }">
        <div style="transform: translateY(-50%)">
          <canvas
            ref="preview"
            class="white"
            :width="video.clientWidth / 3"
            :height="video.clientHeight / 3"
            style="border: 2px solid white"
            :style="{
              borderRadius: $store.state.tweaks.roundWatch
                ? `${$store.state.tweaks.roundTweak / 3}rem`
                : '0',
            }"
          ></canvas>
          <div class="text-center pb-4" style="font-size: 0.8rem">
            <b v-if="seeking">{{ $vuetube.humanTime(value) }}</b>
          </div>
        </div>
      </template>
    </v-slider>
  </div>
</template>

<script>
export default {
  props: {
    video: {},
    controls: {},
    fullscreen: {
      type: Boolean,
      required: true,
    },
    sources: {
      type: Array,
      required: true,
    },
    currentTime: {},
    duration: {
      type: Number,
      required: true,
    },
    seeking: {
      type: Boolean,
      required: true,
    },
    disabled: {
      type: Boolean,
      default: false,
    },
  },
  emits: ["scrub", "seeking"],
  data: () => ({
    vidWrs: "",
  }),
  mounted() {
    this.vidWrs = this.sources[1].url;
  },
  methods: {
    seek(e) {
      // console.log(`scrubbing ${e}`);
      let vid = this.$refs.playerfake;
      let canvas = this.$refs.preview;
      this.$refs.playerfake.currentTime = e;
      canvas
        .getContext("2d")
        .drawImage(
          vid,
          0,
          0,
          this.video.clientWidth / 3,
          this.video.clientHeight / 3
        );
    },
    // TODO: better scrubbing preview start
    // loadVideoFrames() {
    //   // Exit loop if desired number of frames have been extracted
    //   if (this.frames.length >= frameCount) {
    //     this.visibleFrame = 0;

    //     // Append all canvases to container div
    //     this.frames.forEach((frame) => {
    //       this.frameContainerElement.appendChild(frame);
    //     });
    //     return;
    //   }

    //   // If extraction hasn’t started, set desired time for first frame
    //   if (this.frames.length === 0) {
    //     this.requestedTime = 0;
    //   } else {
    //     this.requestedTime = this.requestedTime + this.frameTimestep;
    //   }

    //   // Send seek request to video player for the next frame.
    //   this.videoElement.currentTime = this.requestedTime;
    // },
    // extractFrame(videoWidth, videoHeight) {
    //   // Create DOM canvas object
    //   var canvas = document.createElement("canvas");
    //   canvas.className = "video-scrubber-frame";
    //   canvas.height = videoHeight;
    //   canvas.width = videoWidth;

    //   // Copy current frame to canvas
    //   var context = canvas.getContext("2d");
    //   context.drawImage(this.videoElement, 0, 0, videoWidth, videoHeight);
    //   this.frames.push(canvas);

    //   //  Load the next frame
    //   loadVideoFrames();
    // },
    // async extractFramesFromVideo(videoUrl, fps = 25) {
    //   // fully download it first (no buffering):
    //   console.log(videoUrl);
    //   console.log(fps);
    //   let videoBlob = await fetch(videoUrl, {
    //     headers: { range: "bytes=0-567139" },
    //   }).then((r) => r.blob());
    //   console.log(videoBlob);
    //   let videoObjectUrl = URL.createObjectURL(videoBlob);
    //   let video = document.createElement("video");

    //   let seekResolve;
    //   video.addEventListener("seeked", async function () {
    //     if (seekResolve) seekResolve();
    //   });

    //   video.src = videoObjectUrl;

    //   // workaround chromium metadata bug (https://stackoverflow.com/q/38062864/993683)
    //   while (
    //     (video.duration === Infinity || isNaN(video.duration)) &&
    //     video.readyState < 2
    //   ) {
    //     await new Promise((r) => setTimeout(r, 1000));
    //     video.currentTime = 10000000 * Math.random();
    //   }
    //   let duration = video.duration;

    //   let canvas = document.createElement("canvas");
    //   let context = canvas.getContext("2d");
    //   let [w, h] = [video.videoWidth, video.videoHeight];
    //   canvas.width = w;
    //   canvas.height = h;

    //   let interval = 1;
    //   let currentTime = 0;

    //   while (currentTime < duration) {
    //     video.currentTime = currentTime;
    //     await new Promise((r) => (seekResolve = r));

    //     context.drawImage(video, 0, 0, w, h);
    //     let base64ImageData = canvas.toDataURL();
    //     console.log(base64ImageData);
    //     this.frames.push(base64ImageData);

    //     currentTime += interval;
    //   }
    //   console.log("%c frames", "color: #00ff00");
    //   console.log(this.frames);
    // },
    // TODO: scrubbing preview end
  },
};
</script>
