import type { Field } from '@/types/field'

type DisabledDateChecker = (time: Date) => boolean

function parseIsoBoundaryDate(value: string | undefined): Date | null {
  if (!value) return null
  const parts = String(value).split('-')
  if (parts.length !== 3) return null
  const date = new Date(Number(parts[0]), Number(parts[1]) - 1, Number(parts[2]))
  return Number.isNaN(date.getTime()) ? null : date
}

/** Lite path: disable only dates outside configured min/max (ISO YYYY-MM-DD). */
export function createLiteMinMaxDisabledDate(field: Field): DisabledDateChecker {
  const minDate = parseIsoBoundaryDate(field.minDateValue as string | undefined)
  const maxDate = parseIsoBoundaryDate(field.maxDateValue as string | undefined)

  return (time: Date) => {
    if (minDate && time < minDate) return true
    if (maxDate && time > maxDate) return true
    return false
  }
}

export function resolveDateFieldDisabledDate(field: Field, weekStart: number): DisabledDateChecker {
  const proResolver = window.IvyForms?.hooks?.resolveDateFieldDisabledDate
  if (proResolver) {
    const proChecker = proResolver(field, weekStart)
    if (proChecker) {
      return proChecker
    }
  }

  return createLiteMinMaxDisabledDate(field)
}