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;
  }
}