/**
 * Shared date formatting utilities.
 */

/**
 * Format date as YYYY-MM-DD in local timezone.
 */
export function formatDate(d: Date): string {
  const year = d.getFullYear();
  const month = String(d.getMonth() + 1).padStart(2, "0");
  const day = String(d.getDate()).padStart(2, "0");
  return `${year}-${month}-${day}`;
}

/**
 * Format time from ISO string to HH:MM format in local timezone.
 */
export function formatTime(isoString: string): string {
  const d = new Date(isoString);
  return d.toLocaleTimeString("es-ES", {
    hour: "2-digit",
    minute: "2-digit",
    hour12: false,
  });
}

/**
 * Format datetime from ISO string to a readable format in local timezone.
 */
export function formatDateTime(isoString: string, locale: string = "es-ES"): string {
  const d = new Date(isoString);
  return d.toLocaleString(locale, {
    weekday: "short",
    month: "short",
    day: "numeric",
    hour: "2-digit",
    minute: "2-digit",
    hour12: false,
  });
}

/**
 * Format date for display (e.g., "Mon, Jan 15").
 */
export function formatDisplayDate(d: Date): string {
  return d.toLocaleDateString("es-ES", { weekday: "short", month: "short", day: "numeric" });
}

/**
 * Format time string from "HH:MM:SS" or "HH:MM" format to "HH:MM".
 * Avoids string slicing by properly parsing the time.
 */
export function formatTimeString(timeStr: string): string {
  // Handle both "HH:MM:SS" and "HH:MM" formats
  const parts = timeStr.split(":");
  if (parts.length >= 2) {
    return `${parts[0].padStart(2, "0")}:${parts[1].padStart(2, "0")}`;
  }
  return timeStr;
}

/**
 * Get date range for booking/availability (from minAdvanceDays to maxAdvanceDays).
 * Returns an array of Date objects starting from minAdvanceDays days from today.
 */
export function getDateRange(minAdvanceDays: number, maxAdvanceDays: number): Date[] {
  const dates: Date[] = [];
  const today = new Date();
  for (let i = minAdvanceDays; i <= maxAdvanceDays; i++) {
    const d = new Date(today);
    d.setDate(today.getDate() + i);
    dates.push(d);
  }
  return dates;
}

/**
 * Check if a date is a weekend (Saturday or Sunday).
 */
export function isWeekend(date: Date): boolean {
  const day = date.getDay();
  return day === 0 || day === 6;
}