30 lines
1.4 KiB
JavaScript
30 lines
1.4 KiB
JavaScript
// ------------------------------------------------------------------------
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// dynamic-message.js - Rewrites a cosmic event's message based on where
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// today sits vs. the peak.
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//
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// Before peak : "is active and building - peak on <date>. <detail>"
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// On peak -1d : "peaks tonight - <detail>"
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// After peak : "is past its peak (<date>) but still possibly visible - <detail>"
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//
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// Single-day events (start === end) keep their static message unchanged.
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// ------------------------------------------------------------------------
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export function dynamicCosmicMessage(ev, dateStr) {
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if (!ev.peak || ev.start === ev.end) return ev.message;
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var today = new Date(dateStr + 'T00:00Z');
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var peak = new Date(ev.peak + 'T00:00Z');
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var diffDays = Math.round((today - peak) / 86400000);
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var peakFmt = peak.toLocaleDateString('en-GB', { day: 'numeric', month: 'short', timeZone: 'UTC' });
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var base = ev.message
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.replace(/^.*?(?:peaks tonight|peak tonight|is active tonight|is active|peaks)\s*—\s*/i, '')
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.trim();
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var baseCapd = base.charAt(0).toUpperCase() + base.slice(1);
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if (diffDays < -1) {
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return ev.title + ' is active and building — peak on ' + peakFmt + '. ' + baseCapd;
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} else if (diffDays <= 1) {
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return ev.title + ' peaks tonight — ' + base;
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} else {
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return ev.title + ' is past its peak (' + peakFmt + ') but still possibly visible — ' + base;
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}
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}
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