export interface TimeParts {
  hours: number
  minutes: number
}

export function clampHours(value: number): number {
  if (Number.isNaN(value)) return 0
  return Math.min(23, Math.max(0, Math.trunc(value)))
}

export function clampMinutes(value: number): number {
  if (Number.isNaN(value)) return 0
  return Math.min(59, Math.max(0, Math.trunc(value)))
}

export function padSegment(value: number): string {
  return value.toString().padStart(2, '0')
}

export function parseTime(value: string | null | undefined): TimeParts | null {
  if (!value) return null
  const match = /^(\d{1,2}):(\d{1,2})$/.exec(value.trim())
  if (!match) return null
  return {
    hours: clampHours(Number.parseInt(match[1], 10)),
    minutes: clampMinutes(Number.parseInt(match[2], 10)),
  }
}

export function formatTime(hours: number, minutes: number): string {
  return `${padSegment(clampHours(hours))}:${padSegment(clampMinutes(minutes))}`
}