feat: simulation state management (React Context) and sharing/export

src/lib/sharing.ts

@@ -0,0 +1,57 @@
+import type { SimulationState } from './types';
+
+/**
+ * Encode simulation state into a shareable URL hash.
+ * Uses lz-string for compression.
+ */
+export async function encodeState(state: SimulationState): Promise<string> {
+  const { compressToEncodedURIComponent } = await import('lz-string');
+  const json = JSON.stringify(state);
+  return compressToEncodedURIComponent(json);
+}
+
+/**
+ * Decode simulation state from a URL hash.
+ */
+export async function decodeState(hash: string): Promise<SimulationState | null> {
+  try {
+    const { decompressFromEncodedURIComponent } = await import('lz-string');
+    const json = decompressFromEncodedURIComponent(hash);
+    if (!json) return null;
+    return JSON.parse(json) as SimulationState;
+  } catch {
+    return null;
+  }
+}
+
+/**
+ * Export yearly data as CSV.
+ */
+export function exportCSV(headers: string[], rows: (string | number)[][]): void {
+  const bom = '\uFEFF'; // UTF-8 BOM for Excel
+  const sep = ';';
+  const lines = [
+    headers.join(sep),
+    ...rows.map((row) => row.map((v) => (typeof v === 'number' ? v.toFixed(2) : v)).join(sep)),
+  ];
+  const csv = bom + lines.join('\n');
+  const blob = new Blob([csv], { type: 'text/csv;charset=utf-8;' });
+  const url = URL.createObjectURL(blob);
+  const a = document.createElement('a');
+  a.href = url;
+  a.download = `simulation-pret-immo-${new Date().toISOString().slice(0, 10)}.csv`;
+  a.click();
+  URL.revokeObjectURL(url);
+}
+
+/**
+ * Copy text to clipboard.
+ */
+export async function copyToClipboard(text: string): Promise<boolean> {
+  try {
+    await navigator.clipboard.writeText(text);
+    return true;
+  } catch {
+    return false;
+  }
+}