MediaWiki:Common.js

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/**
* Blue Railroad Submission - Date to Block Height Converter
* Adds a datepicker that converts dates to Ethereum block heights
* Also shows time ago for news templates
*/

(function() {
    'use strict';
    
    // Only run on the Blue Railroad Submission form
    if (!document.querySelector('input[name="Blue Railroad Submission[block_height]"]')) {
        return;
    }
    
    // Reference point: known block and timestamp
    // Post-merge average block time is ~12.12 seconds
    const AVG_BLOCK_TIME = 12.12;
    
    // Get current block from footer (format: "24,328,442")
    function getCurrentBlockFromFooter() {
        const footerLink = document.querySelector('a[href*="etherscan.io/block/"]');
        if (footerLink) {
            const match = footerLink.href.match(/block\/(\d+)/);
            if (match) return parseInt(match[1]);
        }
        return null;
    }
    
    // Calculate block height from date
    function dateToBlockHeight(targetDate, refBlock, refTimestamp) {
        const targetTimestamp = targetDate.getTime() / 1000;
        const secondsDiff = refTimestamp - targetTimestamp;
        const blocksDiff = Math.round(secondsDiff / AVG_BLOCK_TIME);
        return refBlock - blocksDiff;
    }
    
    // Add the datepicker UI
    function addDatePicker() {
        const blockInput = document.querySelector('input[name="Blue Railroad Submission[block_height]"]');
        if (!blockInput) return;
        
        const container = document.createElement('div');
        container.style.marginTop = '8px';
        container.innerHTML = `
            <label style="display: block; margin-bottom: 4px; font-size: 0.9em;">
                Or pick a date/time:
            </label>
            <input type="datetime-local" id="br-datepicker" style="padding: 4px; margin-right: 8px;">
            <button type="button" id="br-convert-btn" style="padding: 4px 12px; cursor: pointer;">
                Convert to Block
            </button>
            <span id="br-status" style="margin-left: 8px; font-size: 0.9em; color: #666;"></span>
        `;
        
        blockInput.parentNode.appendChild(container);
        
        const datePicker = document.getElementById('br-datepicker');
        const convertBtn = document.getElementById('br-convert-btn');
        const status = document.getElementById('br-status');
        
        // Set default to now
        const now = new Date();
        datePicker.value = now.toISOString().slice(0, 16);
        
        convertBtn.addEventListener('click', function() {
            const selectedDate = new Date(datePicker.value);
            if (isNaN(selectedDate.getTime())) {
                status.textContent = 'Invalid date';
                status.style.color = 'red';
                return;
            }
            
            const currentBlock = getCurrentBlockFromFooter();
            if (!currentBlock) {
                status.textContent = 'Could not find reference block';
                status.style.color = 'red';
                return;
            }
            
            const currentTimestamp = Date.now() / 1000;
            const estimatedBlock = dateToBlockHeight(selectedDate, currentBlock, currentTimestamp);
            
            if (estimatedBlock > currentBlock) {
                status.textContent = 'Date is in the future!';
                status.style.color = 'orange';
            } else {
                status.textContent = '~estimated';
                status.style.color = 'green';
            }
            
            blockInput.value = estimatedBlock;
        });
    }
    
    // Run when DOM is ready
    if (document.readyState === 'loading') {
        document.addEventListener('DOMContentLoaded', addDatePicker);
    } else {
        addDatePicker();
    }
})();

/**
 * TimeAgo — shows "X blocks ago" for transcluded templates.
 *
 * Usage in wikitext:
 *   <span class="timeago" data-lastmod-page="Template:NewsShorts"></span>
 *
 * Fetches the last revision timestamp from the API and renders
 * a block-based relative time string using Ethereum block heights.
 */
(function() {
    'use strict';

    // Post-merge average block time is ~12.12 seconds
    var AVG_BLOCK_TIME = 12.12;

    var spans = document.querySelectorAll('.timeago[data-lastmod-page]');
    if (!spans.length) return;

    // Format number with commas (e.g., 1234567 -> "1,234,567")
    function formatNumber(num) {
        return num.toString().replace(/\B(?=(\d{3})+(?!\d))/g, ',');
    }

    // Collect unique page titles
    var titles = [];
    spans.forEach(function(span) {
        var t = span.getAttribute('data-lastmod-page');
        if (t && titles.indexOf(t) === -1) titles.push(t);
    });

    // Batch query the API (up to 50 titles per request)
    var api = mw.config.get('wgScriptPath') + '/api.php';
    var url = api + '?action=query&prop=revisions&rvprop=timestamp&format=json&titles=' +
        encodeURIComponent(titles.join('|'));

    fetch(url).then(function(r) { return r.json(); }).then(function(data) {
        var pages = data.query && data.query.pages || {};
        var timestamps = {};

        Object.keys(pages).forEach(function(id) {
            var page = pages[id];
            if (page.revisions && page.revisions[0]) {
                timestamps[page.title] = new Date(page.revisions[0].timestamp);
            }
        });

        spans.forEach(function(span) {
            var title = span.getAttribute('data-lastmod-page');
            var ts = timestamps[title];
            if (!ts) {
                span.textContent = '';
                return;
            }
            span.textContent = formatBlocksAgo(ts);
            span.title = ts.toLocaleString();
        });
    });

    function formatBlocksAgo(date) {
        var secondsAgo = Math.floor((Date.now() - date.getTime()) / 1000);
        var blocksAgo = Math.round(secondsAgo / AVG_BLOCK_TIME);

        if (blocksAgo < 1) {
            return 'this block';
        } else if (blocksAgo === 1) {
            return '1 block ago';
        } else {
            return formatNumber(blocksAgo) + ' blocks ago';
        }
    }
})();