first commit

frontend/src/lib/format.ts

@@ -0,0 +1,81 @@
+export function formatValue(
+  value: number | string | null | undefined,
+  unit = "",
+  precision = 2,
+  locale = "pl-PL",
+): string {
+  if (value === null || value === undefined || value === "") {
+    return "--";
+  }
+
+  if (typeof value === "number") {
+    return `${value.toLocaleString(locale, {
+      minimumFractionDigits: 0,
+      maximumFractionDigits: precision,
+    })}${unit ? ` ${unit}` : ""}`;
+  }
+
+  return unit ? `${value} ${unit}` : String(value);
+}
+
+export function formatDateTime(value?: string | null, locale = "pl-PL"): string {
+  if (!value) {
+    return "--";
+  }
+  return new Date(value).toLocaleString(locale, {
+    dateStyle: "short",
+    timeStyle: "short",
+  });
+}
+
+export function formatDate(value?: string | null, locale = "pl-PL"): string {
+  if (!value) {
+    return "--";
+  }
+  const parsed = new Date(value);
+  if (Number.isNaN(parsed.getTime())) {
+    return value;
+  }
+  return parsed.toLocaleDateString(locale);
+}
+
+export function formatShortTime(value?: string | null, locale = "pl-PL"): string {
+  if (!value) {
+    return "--";
+  }
+  return new Date(value).toLocaleTimeString(locale, {
+    hour: "2-digit",
+    minute: "2-digit",
+  });
+}
+
+export function formatDurationShort(value?: number | null, locale = "pl-PL"): string {
+  if (value === null || value === undefined || Number.isNaN(value)) {
+    return "--";
+  }
+
+  const totalSeconds = Math.max(Math.round(value), 0);
+  const hours = Math.floor(totalSeconds / 3600);
+  const minutes = Math.floor((totalSeconds % 3600) / 60);
+  const seconds = totalSeconds % 60;
+
+  if (locale.startsWith("pl")) {
+    if (hours > 0) return `${hours}h ${minutes}m`;
+    if (minutes > 0) return `${minutes}m ${seconds}s`;
+    return `${seconds}s`;
+  }
+
+  if (hours > 0) return `${hours}h ${minutes}m`;
+  if (minutes > 0) return `${minutes}m ${seconds}s`;
+  return `${seconds}s`;
+}
+
+export function formatPercent(value?: number | null, precision = 1, locale = "pl-PL"): string {
+  if (value === null || value === undefined || Number.isNaN(value)) {
+    return "--";
+  }
+  return `${value.toLocaleString(locale, {
+    minimumFractionDigits: 0,
+    maximumFractionDigits: precision,
+  })}%`;
+}