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

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

const DATE_ONLY_PATTERN = /^\d{4}-\d{2}-\d{2}$/

function parseDateParts(value: string): [number, number, number] {
  const [year, month, day] = value.split("-").map(Number)
  return [year, month, day]
}

export function parseSprintStart(startDate: string): Date {
  if (DATE_ONLY_PATTERN.test(startDate)) {
    const [year, month, day] = parseDateParts(startDate)
    return new Date(year, month - 1, day, 0, 0, 0, 0)
  }

  return new Date(startDate)
}

export function parseSprintEnd(endDate: string): Date {
  if (DATE_ONLY_PATTERN.test(endDate)) {
    const [year, month, day] = parseDateParts(endDate)
    return new Date(year, month - 1, day, 23, 59, 59, 999)
  }

  const parsed = new Date(endDate)
  parsed.setHours(23, 59, 59, 999)
  return parsed
}