import { clsx, type ClassValue } from "clsx"
import { twMerge } from "tailwind-merge"

export function cn(...inputs: ClassValue[]) {
  return twMerge(clsx(inputs))
}

export function formatCurrency(amount: number, currency = "USD"): string {
  return new Intl.NumberFormat("en-US", {
    style: "currency",
    currency,
    minimumFractionDigits: 0,
    maximumFractionDigits: 2,
  }).format(amount)
}

export function formatDate(date: string | Date): string {
  return new Intl.DateTimeFormat("en-US", {
    year: "numeric",
    month: "short",
    day: "numeric",
  }).format(new Date(date))
}

export function formatDateShort(date: string | Date): string {
  return new Intl.DateTimeFormat("en-US", {
    month: "short",
    day: "numeric",
  }).format(new Date(date))
}

export function daysUntil(date: string | Date): number {
  const target = new Date(date)
  const today = new Date()
  today.setHours(0, 0, 0, 0)
  const diff = target.getTime() - today.getTime()
  return Math.ceil(diff / (1000 * 60 * 60 * 24))
}

export function daysAgo(date: string | Date): number {
  return -daysUntil(date)
}

export function slugify(str: string): string {
  return str.toLowerCase().replace(/\s+/g, "-").replace(/[^\w-]/g, "")
}

export function initials(name: string): string {
  return name
    .split(" ")
    .map((n) => n[0])
    .join("")
    .toUpperCase()
    .slice(0, 2)
}

export function truncate(str: string, length = 50): string {
  return str.length > length ? str.slice(0, length) + "…" : str
}

export function getOccupancyRate(occupied: number, total: number): number {
  if (total === 0) return 0
  return Math.round((occupied / total) * 100)
}
