import type {
  ConsumerButtonAlign,
  ConsumerButtonFill,
  ConsumerButtonRadius,
  ConsumerButtonSize,
  ResolvedConsumerButtonStyle,
} from '@/components/consumer/consumerButtonTypes'
import { cn } from '@/lib/cn'

/** xs/sm/md/lg/xl → px heights (Figma). */
export const CONSUMER_BUTTON_HEIGHT_PX: Record<ConsumerButtonSize, number> = {
  xs: 40,
  sm: 44,
  md: 48,
  lg: 52,
  xl: 60,
}

const HEIGHT_CLASS: Record<ConsumerButtonSize, string> = {
  xs: 'h-10 min-h-10',
  sm: 'h-11 min-h-11',
  md: 'h-12 min-h-12',
  lg: 'h-[52px] min-h-[52px]',
  xl: 'h-[60px] min-h-[60px]',
}

const ICON_ONLY_CLASS: Record<ConsumerButtonSize, string> = {
  xs: 'h-10 w-10 min-h-10 min-w-10',
  sm: 'h-11 w-11 min-h-11 min-w-11',
  md: 'h-12 w-12 min-h-12 min-w-12',
  lg: 'h-[52px] w-[52px] min-h-[52px] min-w-[52px]',
  xl: 'h-[60px] w-[60px] min-h-[60px] min-w-[60px]',
}

const RADIUS_CLASS: Record<ConsumerButtonRadius, string> = {
  full: 'rounded-full',
  control: 'rounded-[10px]',
}

const FILL_CLASS: Record<ConsumerButtonFill, string> = {
  orange: 'bg-primary hover:bg-primary-600 active:bg-primary-700',
  navy: 'bg-tertiary-900 hover:bg-tertiary-800 active:bg-tertiary-900',
  fourth: 'bg-fourth-900 hover:bg-fourth-700 active:bg-fourth-900',
  fifth: 'bg-fifth-900 hover:bg-fifth-700 active:bg-fifth-900',
  gray: 'bg-[#F5F5F5] hover:bg-secondary-40 active:bg-secondary-200',
  none: 'bg-transparent',
}

const DEFAULT_TEXT_CLASS: Record<ConsumerButtonFill, string | undefined> = {
  orange: 'text-white',
  navy: 'text-white',
  fourth: 'text-white',
  fifth: 'text-white',
  gray: 'text-consumer-text',
  none: undefined,
}

const DEFAULT_SIZE: Record<'default' | 'icon', ConsumerButtonSize> = {
  default: 'lg',
  icon: 'sm',
}

function resolveTextColorClass(textColor: string | undefined, fill: ConsumerButtonFill): string | undefined {
  if (!textColor) return DEFAULT_TEXT_CLASS[fill]
  if (textColor === 'white') return 'text-white'
  if (textColor.startsWith('text-') || textColor.startsWith('!text-')) return textColor

  return undefined
}

function resolveTextColorStyle(textColor: string | undefined): string | undefined {
  if (!textColor || textColor === 'white' || textColor.startsWith('text-') || textColor.startsWith('!text-')) {
    return undefined
  }

  if (textColor.startsWith('#')) return textColor

  return undefined
}

/** وقتی از بیرون `px-*` داده شده، padding افقی پیش‌فرض اعمال نمی‌شود. */
function hasHorizontalPaddingOverride(className?: string): boolean {
  return className != null && /\b!?px-/.test(className)
}

function resolveHorizontalPaddingClass(iconOnly: boolean, className?: string): string | undefined {
  if (hasHorizontalPaddingOverride(className)) return undefined

  return iconOnly ? 'px-0' : 'px-4'
}

export function buildConsumerButtonStyle({
  align = 'center',
  className,
  radius = 'full',
  fill = 'orange',
  fontSize = 14,
  fullWidth = false,
  iconOnly = false,
  size,
  textColor,
}: {
  align?: ConsumerButtonAlign
  className?: string
  radius?: ConsumerButtonRadius
  fill?: ConsumerButtonFill
  fontSize?: number
  fullWidth?: boolean
  iconOnly?: boolean
  size?: ConsumerButtonSize
  textColor?: string
}): ResolvedConsumerButtonStyle {
  const resolvedSize = size ?? (iconOnly ? DEFAULT_SIZE.icon : DEFAULT_SIZE.default)
  const textClass = resolveTextColorClass(textColor, fill)
  const inlineColor = resolveTextColorStyle(textColor)

  return {
    className: cn(
      'consumer-focus-ring inline-flex shrink-0 items-center gap-2 font-medium transition-colors',
      'disabled:pointer-events-none disabled:opacity-50',
      resolveHorizontalPaddingClass(iconOnly, className),
      iconOnly
        ? cn(ICON_ONLY_CLASS[resolvedSize], 'justify-center')
        : cn(HEIGHT_CLASS[resolvedSize], align === 'center' ? 'justify-center' : 'justify-start'),
      !iconOnly && 'min-w-0',
      RADIUS_CLASS[radius],
      FILL_CLASS[fill],
      textClass,
      fullWidth && 'w-full',
      className
    ),
    style: {
      fontSize,
      ...(inlineColor ? { color: inlineColor } : {}),
    },
  }
}