// Define a debug mode variable
let debugMode = true;

const canvas = document.getElementById("videoCanvas");
const ctx = canvas.getContext("2d");

let videosToLoad = 2
const maxVideosToLoad = 9
const videos = [];
let videosLoaded = 0;
let aspectRatio = 1;

function loadVideos(num) {
  console.log(`Loading ${num} videos`)
  while (num > 0) {
    let video = createVideoElement()
    video.addEventListener("loadedmetadata", handleVideoLoaded);
    video.addEventListener("loaded", handleVideoEnded);
    video.addEventListener("ended", handleVideoEnded);
    video.src = selectRandomVideo(video)
    videos.push(video)
    num--
  }
  while (num < 0) {
    let video = videos.pop()
    video.removeEventListener("loadedmetadata", handleVideoLoaded);
    video.removeEventListener("ended", handleVideoEnded);
    num++
  }
}

loadVideos(videosToLoad)

videos.forEach((video) => {
  video.addEventListener("loadedmetadata", handleVideoLoaded);
  video.addEventListener("ended", handleVideoEnded);
});

function createVideoElement() {
  const video = document.createElement("video");
  video.autoplay = true;
  video.muted = true;
  return video;
}

function handleVideoLoaded() {
  videosLoaded++;
  if (videosLoaded === videos.length) {
    updateCanvasSize();
    drawVideos();
  }
}

function handleVideoEnded(event) {
  const video = event.target;
  selectRandomVideo(video);
}


function drawVideos() {
  ctx.clearRect(0, 0, canvas.width, canvas.height);

  let blendModes = ["source-over","overlay","screen"]

  videos.forEach((video,i) => {
    // Calculate scaling factor to fit the canvas
    const scale = Math.max(canvas.width/video.videoWidth, canvas.height/video.videoHeight)

    // Calculate scaled dimensions
    const scaledWidth = video.videoWidth * scale
    const scaledHeight = video.videoHeight * scale

    // Calculate horizontal and vertical centering offset
    const offsetX = (canvas.width-scaledWidth)/2
    const offsetY = (canvas.height-scaledHeight)/2

    // Use default blend mode for first video (i=0), repeat the rest of blendModes
    if (i === 0) {
      ctx.globalCompositeOperation = blendModes[0];
    } else {
      ctx.globalCompositeOperation = blendModes[(i - 1) % (blendModes.length - 1) + 1];
    }

    // Draw the current video frame onto the canvas
    ctx.drawImage(video, offsetX, offsetY, scaledWidth, scaledHeight)

    // Reset composite operation
    ctx.globalCompositeOperation = "source-over";
  })

  // If debugMode is true, draw debug text
  if (debugMode) {
    drawDebugText();
  }

  // Request next frame
  requestAnimationFrame(drawVideos);
}

function drawDebugText() {
  // Set font style and color
  ctx.font = "16px Arial";
  ctx.fillStyle = "white";

  let corners = [[0, 0], [1, 1], [0, 1], [1, 0]]; // Top-left, bottom-right, top-right, bottom-left
  let padding = 20

  videos.forEach((video, i) => {
    // Get the corner coordinates for the current video
    const corner = corners[i];

    // Calculate the position of the text in the corner
    let positionX = corner[0] ? canvas.width : padding
    let positionY = corner[1] ? canvas.height : padding

    // Adjust position to ensure text is within the canvas bounds
    //positionX = Math.max(0, Math.min(positionX, canvas.width - ctx.measureText(getFilename(video.src)).width));
    positionY = Math.max(0, Math.min(positionY, canvas.height - padding*3));

    // Set text alignment based on corner
    ctx.textAlign = corner[0] ? "right" : "left"
    ctx.textBaseline = corner[1]  ? "bottom" : "top"

    // Draw debug text for the video
    ctx.fillText(getFilename(video.src), positionX, positionY);
    ctx.fillText(`Dimensions: ${video.videoWidth}x${video.videoHeight} ()`, positionX, positionY + 20);
    ctx.fillText(formatTime(video.currentTime) + "/" + formatTime(video.duration), positionX, positionY + 40);
    // Add more debug information as needed
  });
}



// Function to extract filename from full path
function getFilename(src) {
  const parts = src.split('/');
  return decodeURIComponent(parts[parts.length - 1].replace(/\%20/g, ' '));
}

// Helper function to format time in HH:MM:SS format
function formatTime(seconds) {
  const hours = Math.floor(seconds / 3600);
  const minutes = Math.floor((seconds % 3600) / 60);
  const remainingSeconds = Math.floor(seconds % 60);
  return `${hours.toString().padStart(2, '0')}:${minutes.toString().padStart(2, '0')}:${remainingSeconds.toString().padStart(2, '0')}`;
}

function updateCanvasSize() {
  aspectRatio = Math.max(
    videos[0].videoWidth / videos[0].videoHeight,
    videos[1].videoWidth / videos[1].videoHeight
  );

  canvas.width = window.innerWidth;
  canvas.height = window.innerWidth / aspectRatio;
}

window.addEventListener("resize", updateCanvasSize);

updateCanvasSize()

function selectRandomVideo(videoElement) {
  console.log("selectRandomVideo",videoElement)
  fetch("/api/videos")
    .then((response) => response.json())
    .then((videoFiles) => {
      const otherVideo = videos.find((video) => video !== videoElement);

      let randomVideo;
      do {
        const randomIndex = Math.floor(Math.random() * videoFiles.length);
        randomVideo = videoFiles[randomIndex];
      } while (randomVideo === otherVideo);

      videoElement.src = randomVideo.src;
      videoElement.play();
      return videoElement
    });
}


document.addEventListener('keydown', function(event) {
    console.log('keyDown',event)
    // Check if the pressed key is the one you want to bind
    if (event.key === 'Enter') {
        debugMode = !debugMode
        console.log("debugMode:",debugMode)
    }
    if (event.key === 'ArrowDown') {
        loadVideos(-1)
    }
    if (event.key === 'ArrowUp') {
        loadVideos(1)
    }
});