User:Most2dot0/common.js

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// embedded YouTube player implementation 
// Use like this, where + designates an optional start, and "-" an optional stop time:
// <div class="youtube-player-placeholder" data-videos="VIDEO_ID_1|+45-135,VIDEO_ID_2,VIDEO_ID_3|+10-60"></div>

function insertYouTubePlayers() {
    var placeholders = document.querySelectorAll('.youtube-player-placeholder');

    // Load the YouTube IFrame API if not already loaded
    if (!document.getElementById('youtube-iframe-api')) {
        var tag = document.createElement('script');
        tag.src = "https://www.youtube.com/iframe_api";
        tag.id = 'youtube-iframe-api';
        var firstScriptTag = document.getElementsByTagName('script')[0];
        firstScriptTag.parentNode.insertBefore(tag, firstScriptTag);
    }

    var videoLists = [];
    var currentVideoIndices = [];
    var checkIntervals = [];

    function parseVideosFromPlaceholder(placeholder) {
        var videoDataList = [];

        // Check for YouTube URLs in the placeholder's text content
        var textContent = placeholder.dataset.originalText;
        var youtubeUrlPattern = /https?:\/\/(www\.)?youtube\.com\/watch\?v=([a-zA-Z0-9_-]+)([^\s]*)/g;
        var match;

        while ((match = youtubeUrlPattern.exec(textContent)) !== null) {
            var videoId = match[2];
            var params = new URLSearchParams(match[3]);
            var start = params.get('t') ? parseInt(params.get('t')) : 0;
            var end = params.get('end') ? parseInt(params.get('end')) : null;
            videoDataList.push({ videoId: videoId, start: start, end: end });
        }

        // If no URLs found, fall back to data-videos attribute
        if (videoDataList.length === 0) {
            videoDataList = placeholder.getAttribute('data-videos').split(',').map(function(videoData) {
                var parts = videoData.split('|');
                var videoId = parts[0];
                var start = 0;
                var end = null;

                if (parts.length > 1) {
                    var timeParts = parts[1].split('+');
                    if (timeParts.length > 1) {
                        start = parseInt(timeParts[0]) || 0;
                        end = timeParts[1] ? parseInt(timeParts[1]) : null;
                    } else if (parts[1].includes('-')) {
                        start = parseInt(parts[1].split('-')[0]) || 0;
                        end = parseInt(parts[1].split('-')[1]) || null;
                    }
                }

                return { videoId: videoId, start: start, end: end };
            });
        }

        return videoDataList;
    }

    function onYouTubeIframeAPIReady() {
        var observer = new IntersectionObserver(function(entries) {
            entries.forEach(function(entry) {
                if (entry.isIntersecting) {
                    var index = entry.target.getAttribute('data-index');
                    if (!entry.target.getAttribute('data-loaded')) {
                        entry.target.setAttribute('data-loaded', 'true');
                        loadYouTubePlayer(entry.target, index);
                    }
                }
            });
        });

        placeholders.forEach(function(placeholder, index) {
            placeholder.setAttribute('data-index', index);

            // Save the original text content if not already saved
            if (!placeholder.dataset.originalText) {
                placeholder.dataset.originalText = placeholder.innerHTML.trim();
            }

            observer.observe(placeholder);
        });
    }

    window.onYouTubeIframeAPIReady = onYouTubeIframeAPIReady;

    function loadYouTubePlayer(placeholder, index) {
        var videoDataList = parseVideosFromPlaceholder(placeholder);

        videoLists[index] = videoDataList;
        currentVideoIndices[index] = 0;
        checkIntervals[index] = null;

        // Preserve the placeholder's original text content
        var originalHTML = document.createElement('div');
        originalHTML.className = 'youtube-placeholder-text';
        originalHTML.innerHTML = placeholder.dataset.originalText;
        placeholder.innerHTML = ''; // Clear the original content of the placeholder
        placeholder.appendChild(originalHTML);

        var playerDiv = document.createElement('div');
        playerDiv.id = 'youtube-player-' + index;
        placeholder.appendChild(playerDiv);

        var controlsDiv = document.createElement('div');
        controlsDiv.className = 'youtube-player-controls';
        controlsDiv.innerHTML = '<button class="prev-button" data-index="' + index + '">Previous</button>' +
                                '<button class="next-button" data-index="' + index + '">Next</button>';
        placeholder.appendChild(controlsDiv);

        window['youtube-player-' + index] = new YT.Player('youtube-player-' + index, {
            height: '270',
            width: '480',
            videoId: videoLists[index][currentVideoIndices[index]].videoId,
            playerVars: {
                start: videoLists[index][currentVideoIndices[index]].start
            },
            events: {
                'onStateChange': onPlayerStateChange(index),
                'onReady': onPlayerReady(index)
            }
        });

        // Add click event listeners to the YouTube links in the placeholder's text
        var links = originalHTML.querySelectorAll('a');
        links.forEach(function(link) {
            var href = link.getAttribute('href');
            var match = href.match(/https?:\/\/(www\.)?youtube\.com\/watch\?v=([a-zA-Z0-9_-]+)([^\s]*)/);
            if (match) {
                link.addEventListener('click', function(event) {
                    event.preventDefault();
                    var videoId = match[2];
                    var params = new URLSearchParams(match[3]);
                    var start = params.get('t') ? parseInt(params.get('t')) : 0;
                    var end = params.get('end') ? parseInt(params.get('end')) : null;

                    var videoIndex = videoLists[index].findIndex(function(video) {
                        return video.videoId === videoId && 
                               video.start === start && 
                               (video.end === end || video.end === null);
                    });

                    if (videoIndex !== -1) {
                        currentVideoIndices[index] = videoIndex;
                        window['youtube-player-' + index].loadVideoById({
                            videoId: videoLists[index][currentVideoIndices[index]].videoId,
                            startSeconds: videoLists[index][currentVideoIndices[index]].start
                        });
                    }
                });
            }
        });
    }

    function onPlayerReady(index) {
        return function(event) {
            var placeholder = placeholders[index];
            var originalHTML = placeholder.querySelector('.youtube-placeholder-text');
            originalHTML.style.display = ''; // Ensure the original text is displayed correctly
        };
    }

    function onPlayerStateChange(index) {
        return function(event) {
            clearInterval(checkIntervals[index]);
            if (event.data == YT.PlayerState.PLAYING && videoLists[index][currentVideoIndices[index]].end) {
                checkIntervals[index] = setInterval(function() {
                    var currentTime = window['youtube-player-' + index].getCurrentTime();
                    if (currentTime >= videoLists[index][currentVideoIndices[index]].end) {
                        playNextVideo(index);
                    }
                }, 1000); // Check every second
            } else if (event.data == YT.PlayerState.ENDED) {
                playNextVideo(index);
            }
        };
    }

    function playNextVideo(index) {
        clearInterval(checkIntervals[index]);
        currentVideoIndices[index]++;
        if (currentVideoIndices[index] < videoLists[index].length) {
            window['youtube-player-' + index].loadVideoById({
                videoId: videoLists[index][currentVideoIndices[index]].videoId,
                startSeconds: videoLists[index][currentVideoIndices[index]].start
            });
        } else {
            currentVideoIndices[index] = 0;
            window['youtube-player-' + index].loadVideoById({
                videoId: videoLists[index][currentVideoIndices[index]].videoId,
                startSeconds: videoLists[index][currentVideoIndices[index]].start
            });
        }
    }

    function playPreviousVideo(index) {
        clearInterval(checkIntervals[index]);
        currentVideoIndices[index]--;
        if (currentVideoIndices[index] >= 0) {
            window['youtube-player-' + index].loadVideoById({
                videoId: videoLists[index][currentVideoIndices[index]].videoId,
                startSeconds: videoLists[index][currentVideoIndices[index]].start
            });
        } else {
            currentVideoIndices[index] = videoLists[index].length - 1;
            window['youtube-player-' + index].loadVideoById({
                videoId: videoLists[index][currentVideoIndices[index]].videoId,
                startSeconds: videoLists[index][currentVideoIndices[index]].start
            });
        }
    }

    document.addEventListener('click', function(event) {
        if (event.target.classList.contains('next-button')) {
            var index = event.target.getAttribute('data-index');
            playNextVideo(index);
        } else if (event.target.classList.contains('prev-button')) {
            var index = event.target.getAttribute('data-index');
            playPreviousVideo(index);
        }
    });
}

insertYouTubePlayers();