/**
 * Utility Functions
 *
 * Common helper functions for the application including:
 * - UI styling utilities (shadcn)
 * - Date formatting for notices
 * - PocketBase file URL resolution
 */

/* Shadcn */
import { twMerge } from "tailwind-merge";
import { clsx, type ClassValue } from "clsx";
import type { RecordModel } from "pocketbase";
import { pb } from "./pocketbase";

/* Combines Tailwind classes with proper conflict resolution */
const cn = (...inputs: ClassValue[]) => twMerge(clsx(inputs));
export { cn };

/**
 * Formats PocketBase created timestamp to human-readable Bosnian format
 * Examples: "Danas, 9:30", "Juče, 15:15", "18. Okt, 10:45"
 *
 * @param dateStr ISO 8601 datetime string from PocketBase
 * @returns Formatted date string in Bosnian
 */
export function formatPostedDate(dateStr: string): string {
  const date = new Date(dateStr);
  const now = new Date();
  const diffMs = now.getTime() - date.getTime();
  const diffDays = Math.floor(diffMs / (1000 * 60 * 60 * 24));

  const timeStr = date.toLocaleTimeString("bs-BA", {
    hour: "2-digit",
    minute: "2-digit",
  });

  if (diffDays === 0) {
    return `Danas, ${timeStr}`;
  }

  if (diffDays === 1) {
    return `Juče, ${timeStr}`;
  }

  const dateStr2 = date.toLocaleDateString("bs-BA", {
    day: "numeric",
    month: "short",
  });

  return `${dateStr2}, ${timeStr}`;
}

/**
 * Checks if a notice has expired
 *
 * @param expiresAt ISO 8601 datetime string
 * @returns true if the expiry date has passed, false otherwise
 */
export function isExpired(expiresAt: string): boolean {
  return new Date() > new Date(expiresAt);
}

/**
 * Generates PocketBase file URL for a record's file field
 *
 * @param record PocketBase record containing the file
 * @param filename Name of the file field
 * @returns Full URL to the file, or empty string if no file
 */
export function getFileUrl(record: RecordModel, filename: string): string {
  return filename ? pb.files.getURL(record, filename) : "";
}