/**
 * Generic CSV export utility.
 * Generates a CSV string from an array of objects and triggers a download.
 */

function escapeCsvValue(value: unknown): string {
  if (value == null) return "";
  const str = String(value);
  // Wrap in quotes if it contains comma, quote, or newline
  if (str.includes(",") || str.includes('"') || str.includes("\n")) {
    return `"${str.replace(/"/g, '""')}"`;
  }
  return str;
}

interface CsvColumn<T> {
  header: string;
  accessor: (row: T) => unknown;
}

export function generateCsv<T>(rows: T[], columns: CsvColumn<T>[]): string {
  const header = columns.map((c) => escapeCsvValue(c.header)).join(",");
  const body = rows
    .map((row) => columns.map((col) => escapeCsvValue(col.accessor(row))).join(","))
    .join("\n");
  return `${header}\n${body}`;
}

export function downloadCsv(csvContent: string, filename: string): void {
  const blob = new Blob(["\uFEFF" + csvContent], { type: "text/csv;charset=utf-8;" });
  const url = URL.createObjectURL(blob);
  const link = document.createElement("a");
  link.href = url;
  link.download = filename;
  document.body.appendChild(link);
  link.click();
  document.body.removeChild(link);
  URL.revokeObjectURL(url);
}