export function dateKey(date: Date) {
  const y = date.getFullYear()
  const m = `${date.getMonth() + 1}`.padStart(2, '0')
  const d = `${date.getDate()}`.padStart(2, '0')
  return `${y}-${m}-${d}`
}

export function habitWeek(now = new Date()) {
  const monday = new Date(now.getFullYear(), now.getMonth(), now.getDate())
  monday.setDate(monday.getDate() - ((monday.getDay() + 6) % 7))
  return Array.from({ length: 7 }, (_, index) => {
    const date = new Date(monday)
    date.setDate(monday.getDate() + index)
    return date
  })
}

export function mergePage<T>(page: T[] | { items?: T[]; next_cursor?: string | null }) {
  if (Array.isArray(page)) return { items: page, nextCursor: null }
  return { items: page.items ?? [], nextCursor: page.next_cursor ?? null }
}

export function isTaskView(view: string) {
  return view === 'tasks' || view === 'today' || view === 'upcoming'
}

export function isHabitComplete(kind: string | undefined, value: number | boolean | undefined, target = 1) {
  if (kind === 'numeric') return Number(value ?? 0) >= target
  return Boolean(value)
}

export function numericHabitInputValue(input: number | string | undefined) {
  if (input === undefined || input === '') return null
  const value = Number(input)
  return Number.isFinite(value) && value >= 0 ? value : null
}

export function shouldToggleHabitSwipe(deltaX: number, deltaY: number) {
  return deltaX >= 64 && Math.abs(deltaY) <= 24 && deltaX > Math.abs(deltaY) * 1.5
}