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lib/utils/label-colors.ts

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+/**
+ * Label color utilities for environment labels
+ *
+ * Provides consistent, deterministic color assignment based on label string hash.
+ * Colors are from Tailwind's color palette for visual consistency.
+ */
+
+// Tailwind color palette - vibrant, distinguishable colors
+const LABEL_COLORS = [
+	'#ef4444', // red-500
+	'#f97316', // orange-500
+	'#eab308', // yellow-500
+	'#22c55e', // green-500
+	'#14b8a6', // teal-500
+	'#3b82f6', // blue-500
+	'#8b5cf6', // violet-500
+	'#ec4899', // pink-500
+	'#06b6d4', // cyan-500
+	'#84cc16', // lime-500
+	'#6366f1', // indigo-500
+	'#d946ef' // fuchsia-500
+];
+
+// Lighter variants for backgrounds (with alpha)
+const LABEL_BG_COLORS = [
+	'rgba(239, 68, 68, 0.15)', // red
+	'rgba(249, 115, 22, 0.15)', // orange
+	'rgba(234, 179, 8, 0.15)', // yellow
+	'rgba(34, 197, 94, 0.15)', // green
+	'rgba(20, 184, 166, 0.15)', // teal
+	'rgba(59, 130, 246, 0.15)', // blue
+	'rgba(139, 92, 246, 0.15)', // violet
+	'rgba(236, 72, 153, 0.15)', // pink
+	'rgba(6, 182, 212, 0.15)', // cyan
+	'rgba(132, 204, 22, 0.15)', // lime
+	'rgba(99, 102, 241, 0.15)', // indigo
+	'rgba(217, 70, 239, 0.15)' // fuchsia
+];
+
+/**
+ * Generate a hash from a string for consistent color assignment
+ */
+function hashString(str: string): number {
+	let hash = 0;
+	for (let i = 0; i < str.length; i++) {
+		const char = str.charCodeAt(i);
+		hash = (hash << 5) - hash + char;
+		hash = hash & hash; // Convert to 32-bit integer
+	}
+	return Math.abs(hash);
+}
+
+/**
+ * Get the primary color for a label (for text/borders)
+ */
+export function getLabelColor(label: string): string {
+	const index = hashString(label) % LABEL_COLORS.length;
+	return LABEL_COLORS[index];
+}
+
+/**
+ * Get the background color for a label (lighter, with transparency)
+ */
+export function getLabelBgColor(label: string): string {
+	const index = hashString(label) % LABEL_BG_COLORS.length;
+	return LABEL_BG_COLORS[index];
+}
+
+/**
+ * Get both colors for a label as an object
+ */
+export function getLabelColors(label: string): { color: string; bgColor: string } {
+	const index = hashString(label) % LABEL_COLORS.length;
+	return {
+		color: LABEL_COLORS[index],
+		bgColor: LABEL_BG_COLORS[index]
+	};
+}
+
+/**
+ * Maximum number of labels allowed per environment
+ */
+export const MAX_LABELS = 10;
+
+/**
+ * Parse labels from JSON string or array (handles both database and API formats)
+ */
+export function parseLabels(labels: string | string[] | null | undefined): string[] {
+	if (!labels) return [];
+	// Already an array - return as-is
+	if (Array.isArray(labels)) return labels;
+	// JSON string from database
+	try {
+		const parsed = JSON.parse(labels);
+		return Array.isArray(parsed) ? parsed : [];
+	} catch {
+		return [];
+	}
+}
+
+/**
+ * Serialize labels to JSON string for database storage
+ */
+export function serializeLabels(labels: string[]): string | null {
+	if (!labels || labels.length === 0) return null;
+	return JSON.stringify(labels);
+}