import { computed, type Ref, useSlots } from 'vue'
import type { ButtonDuotoneGradient, ButtonGradient, ButtonMonochromeGradient, ButtonSize, ButtonVariant } from '../types'

export type ButtonClassMap<T extends string> = { hover: Record<T, string>; default: Record<T, string> }

const buttonColorClasses: ButtonClassMap<ButtonVariant> = {
  default: {
    default: 'text-white bg-blue-700 focus:ring-4 focus:ring-blue-300 font-medium rounded-lg dark:bg-blue-600 focus:outline-none dark:focus:ring-blue-800',
    blue: 'text-white bg-blue-700 focus:ring-4 focus:ring-blue-300 font-medium rounded-lg dark:bg-blue-600 focus:outline-none dark:focus:ring-blue-800',
    alternative:
      'font-medium text-gray-900 focus:outline-none bg-white rounded-lg border border-gray-200 focus:z-10 focus:ring-4 focus:ring-gray-200 dark:focus:ring-gray-700 dark:bg-gray-800 dark:text-gray-400 dark:border-gray-600',
    dark: 'text-white bg-gray-800 focus:outline-none focus:ring-4 focus:ring-gray-300 font-medium rounded-lg dark:bg-gray-800 dark:focus:ring-gray-700 dark:border-gray-700',
    light:
      'text-gray-900 bg-white border border-gray-300 focus:outline-none focus:ring-4 focus:ring-gray-200 font-medium rounded-lg dark:bg-gray-800 dark:text-white dark:border-gray-600 dark:focus:ring-gray-700',
    green: 'focus:outline-none text-white bg-green-700 focus:ring-4 focus:ring-green-300 font-medium rounded-lg dark:bg-green-600 dark:focus:ring-green-800',
    red: 'focus:outline-none text-white bg-red-700 focus:ring-4 focus:ring-red-300 font-medium rounded-lg dark:bg-red-600 dark:focus:ring-red-900',
    yellow: 'focus:outline-none text-white bg-yellow-400 focus:ring-4 focus:ring-yellow-300 font-medium rounded-lg dark:focus:ring-yellow-900',
    purple: 'focus:outline-none text-white bg-purple-700 focus:ring-4 focus:ring-purple-300 font-medium rounded-lg dark:bg-purple-600 dark:focus:ring-purple-900',
    pink: 'focus:outline-none text-white bg-pink-700 focus:ring-4 focus:ring-pink-300 font-medium rounded-lg dark:bg-pink-600 dark:focus:ring-pink-900',
  },
  hover: {
    default: 'hover:bg-blue-800 dark:hover:bg-blue-700',
    blue: 'hover:bg-blue-800 dark:hover:bg-blue-700',
    alternative: 'hover:bg-gray-100 hover:text-blue-700 dark:hover:text-white dark:hover:bg-gray-700',
    dark: 'hover:bg-gray-900 dark:hover:bg-gray-700',
    light: 'hover:bg-gray-100 dark:hover:border-gray-600',
    green: 'hover:bg-green-800 dark:hover:bg-green-700',
    red: 'hover:bg-red-800 dark:hover:bg-red-700',
    yellow: 'hover:bg-yellow-500',
    purple: 'hover:bg-purple-800 dark:hover:bg-purple-700',
    pink: 'hover:bg-pink-800 dark:hover:bg-pink-700',
  },
}

const buttonOutlineColorClasses: ButtonClassMap<Exclude<ButtonVariant, 'light' | 'alternative'>> = {
  default: {
    dark: 'text-gray-900 border border-gray-800 focus:ring-4 focus:outline-none focus:ring-gray-300 font-medium rounded-lg text-sm text-center dark:border-gray-600 dark:text-gray-400 dark:focus:ring-gray-800',
    default:
      'text-blue-700 border border-blue-700 focus:ring-4 focus:outline-none focus:ring-blue-300 font-medium rounded-lg text-sm text-center dark:border-blue-500 dark:text-blue-500 dark:focus:ring-blue-800',
    blue: 'text-blue-700 border border-blue-700 focus:ring-4 focus:outline-none focus:ring-blue-300 font-medium rounded-lg text-sm text-center dark:border-blue-500 dark:text-blue-500 dark:focus:ring-blue-800',
    green:
      'text-green-700 border border-green-700 focus:ring-4 focus:outline-none focus:ring-green-300 font-medium rounded-lg text-sm text-center dark:border-green-500 dark:text-green-500 dark:focus:ring-green-800',
    purple:
      'text-purple-700 border border-purple-700 focus:ring-4 focus:outline-none focus:ring-purple-300 font-medium rounded-lg text-sm text-center dark:border-purple-400 dark:text-purple-400 dark:focus:ring-purple-900',
    pink: 'text-pink-700 border border-pink-700 focus:ring-4 focus:outline-none focus:ring-pink-300 font-medium rounded-lg text-sm text-center dark:border-pink-400 dark:text-pink-400 dark:focus:ring-pink-900',
    red: 'text-red-700 border border-red-700 focus:ring-4 focus:outline-none focus:ring-red-300 font-medium rounded-lg text-sm text-center dark:border-red-500 dark:text-red-500 dark:focus:ring-red-900',
    yellow:
      'text-yellow-400 border border-yellow-400 focus:ring-4 focus:outline-none focus:ring-yellow-300 font-medium rounded-lg text-sm text-center dark:border-yellow-300 dark:text-yellow-300 dark:focus:ring-yellow-900',
  },
  hover: {
    dark: 'hover:text-white hover:bg-gray-900 dark:hover:text-white dark:hover:bg-gray-600',
    default: 'hover:text-white hover:bg-blue-800 dark:hover:text-white dark:hover:bg-blue-600',
    blue: 'hover:text-white hover:bg-blue-800 dark:hover:text-white dark:hover:bg-blue-600',
    green: 'hover:text-white hover:bg-green-800 dark:hover:text-white dark:hover:bg-green-600',
    purple: 'hover:text-white hover:bg-purple-800 dark:hover:text-white dark:hover:bg-purple-500',
    pink: 'hover:text-white hover:bg-pink-800 dark:hover:text-white dark:hover:bg-pink-500',
    red: 'hover:text-white hover:bg-red-800 dark:hover:text-white dark:hover:bg-red-600',
    yellow: 'hover:text-white hover:bg-yellow-500 dark:hover:text-white dark:hover:bg-yellow-400',
  },
}

const buttonGradientClasses: ButtonClassMap<ButtonGradient> = {
  hover: {
    'cyan-blue': 'hover:bg-gradient-to-bl',
    'green-blue': 'hover:bg-gradient-to-bl',
    'pink-orange': 'hover:bg-gradient-to-bl',
    'purple-blue': 'hover:bg-gradient-to-bl',
    'purple-pink': 'hover:bg-gradient-to-l',
    'red-yellow': 'hover:bg-gradient-to-bl',
    'teal-lime': 'hover:bg-gradient-to-l hover:from-teal-200 hover:to-lime-200',
    blue: 'hover:bg-gradient-to-br',
    cyan: 'hover:bg-gradient-to-br',
    green: 'hover:bg-gradient-to-br',
    lime: 'hover:bg-gradient-to-br',
    pink: 'hover:bg-gradient-to-br',
    purple: 'hover:bg-gradient-to-br',
    red: 'hover:bg-gradient-to-br',
    teal: 'hover:bg-gradient-to-br',
  },
  default: {
    'cyan-blue': 'text-white bg-gradient-to-r from-cyan-500 to-blue-500 focus:ring-4 focus:outline-none focus:ring-cyan-300 dark:focus:ring-cyan-800 font-medium rounded-lg',
    'green-blue': 'text-white bg-gradient-to-br from-green-400 to-blue-600 focus:ring-4 focus:outline-none focus:ring-green-200 dark:focus:ring-green-800 font-medium rounded-lg',
    'pink-orange': 'text-white bg-gradient-to-br from-pink-500 to-orange-400 focus:ring-4 focus:outline-none focus:ring-pink-200 dark:focus:ring-pink-800 font-medium rounded-lg',
    'purple-blue': 'text-white bg-gradient-to-br from-purple-600 to-blue-500 focus:ring-4 focus:outline-none focus:ring-blue-300 dark:focus:ring-blue-800 font-medium rounded-lg',
    'purple-pink': 'text-white bg-gradient-to-r from-purple-500 to-pink-500 focus:ring-4 focus:outline-none focus:ring-purple-200 dark:focus:ring-purple-800 font-medium rounded-lg',
    'red-yellow': 'text-gray-900 bg-gradient-to-r from-red-200 via-red-300 to-yellow-200 focus:ring-4 focus:outline-none focus:ring-red-100 dark:focus:ring-red-400 font-medium rounded-lg',
    'teal-lime': 'text-gray-900 bg-gradient-to-r from-teal-200 to-lime-200 focus:ring-4 focus:outline-none focus:ring-lime-200 dark:focus:ring-teal-700 font-medium rounded-lg',
    blue: 'text-white bg-gradient-to-r from-blue-500 via-blue-600 to-blue-700 focus:ring-4 focus:outline-none focus:ring-blue-300 dark:focus:ring-blue-800 rounded-lg',
    cyan: 'text-white bg-gradient-to-r from-cyan-500 via-cyan-600 to-cyan-700 focus:ring-4 focus:outline-none focus:ring-cyan-300 dark:focus:ring-cyan-800 rounded-lg',
    green: 'text-white bg-gradient-to-r from-green-500 via-green-600 to-green-700 focus:ring-4 focus:outline-none focus:ring-green-300 dark:focus:ring-green-800 rounded-lg',
    lime: 'text-gray-900 bg-gradient-to-r from-lime-500 via-lime-600 to-lime-700 focus:ring-4 focus:outline-none focus:ring-lime-300 dark:focus:ring-lime-800 rounded-lg',
    pink: 'text-white bg-gradient-to-r from-pink-500 via-pink-600 to-pink-700 focus:ring-4 focus:outline-none focus:ring-pink-300 dark:focus:ring-pink-800 rounded-lg',
    purple: 'text-white bg-gradient-to-r from-purple-500 via-purple-600 to-purple-700 focus:ring-4 focus:outline-none focus:ring-purple-300 dark:focus:ring-purple-800 rounded-lg',
    red: 'text-white bg-gradient-to-r from-red-500 via-red-600 to-red-700 focus:ring-4 focus:outline-none focus:ring-red-300 dark:focus:ring-red-800 rounded-lg',
    teal: 'text-white bg-gradient-to-r from-teal-500 via-teal-600 to-teal-700 focus:ring-4 focus:outline-none focus:ring-teal-300 dark:focus:ring-teal-800 rounded-lg',
  },
}

const buttonOutlineGradientClasses: ButtonClassMap<ButtonDuotoneGradient> = {
  default: {
    'cyan-blue': 'relative inline-flex items-center justify-center overflow-hidden font-medium text-gray-900 rounded-lg group bg-gradient-to-br from-cyan-500 to-blue-500 dark:text-white focus:ring-4 focus:outline-none focus:ring-cyan-200 dark:focus:ring-cyan-800',
    'green-blue': 'relative inline-flex items-center justify-center overflow-hidden font-medium text-gray-900 rounded-lg group bg-gradient-to-br from-green-400 to-blue-600 dark:text-white focus:ring-4 focus:outline-none focus:ring-green-200 dark:focus:ring-green-800',
    'pink-orange': 'relative inline-flex items-center justify-center overflow-hidden font-medium text-gray-900 rounded-lg group bg-gradient-to-br from-pink-500 to-orange-400 dark:text-white focus:ring-4 focus:outline-none focus:ring-pink-200 dark:focus:ring-pink-800',
    'purple-blue': 'relative inline-flex items-center justify-center overflow-hidden font-medium text-gray-900 rounded-lg group bg-gradient-to-br from-purple-600 to-blue-500 dark:text-white focus:ring-4 focus:outline-none focus:ring-blue-300 dark:focus:ring-blue-800',
    'purple-pink': 'relative inline-flex items-center justify-center overflow-hidden font-medium text-gray-900 rounded-lg group bg-gradient-to-br from-purple-500 to-pink-500 dark:text-white focus:ring-4 focus:outline-none focus:ring-purple-200 dark:focus:ring-purple-800',
    'red-yellow': 'relative inline-flex items-center justify-center overflow-hidden font-medium text-gray-900 rounded-lg group bg-gradient-to-br from-red-200 via-red-300 to-yellow-200 dark:text-white focus:ring-4 focus:outline-none focus:ring-red-100 dark:focus:ring-red-400',
    'teal-lime': 'relative inline-flex items-center justify-center overflow-hidden font-medium text-gray-900 rounded-lg group bg-gradient-to-br from-teal-300 to-lime-300 dark:text-white focus:ring-4 focus:outline-none focus:ring-lime-200 dark:focus:ring-lime-800',
  },
  hover: {
    'cyan-blue': 'group-hover:from-cyan-500 group-hover:to-blue-500 hover:text-white',
    'green-blue': 'group-hover:from-green-400 group-hover:to-blue-600 hover:text-white',
    'pink-orange': 'group-hover:from-pink-500 group-hover:to-orange-400 hover:text-white',
    'purple-blue': 'group-hover:from-purple-600 group-hover:to-blue-500 hover:text-white',
    'purple-pink': 'group-hover:from-purple-500 group-hover:to-pink-500 hover:text-white',
    'red-yellow': 'group-hover:from-red-200 group-hover:via-red-300 group-hover:to-yellow-200 dark:hover:text-gray-900',
    'teal-lime': 'group-hover:from-teal-300 group-hover:to-lime-300 dark:hover:text-gray-900',
  },
}

const buttonSizeClasses: Record<ButtonSize, string> = {
  xs: 'text-xs px-2 py-1',
  sm: 'text-sm px-3 py-1.5',
  md: 'text-sm px-4 py-2',
  lg: 'text-base px-5 py-2.5',
  xl: 'text-base px-6 py-3',
}

const buttonSquareSizeClasses: Record<ButtonSize, string> = {
  xs: 'text-xs p-1',
  sm: 'text-sm p-1.5',
  md: 'text-sm p-2',
  lg: 'text-base p-2.5',
  xl: 'text-base p-3',
}

const buttonShadowClasses: Record<ButtonMonochromeGradient, string> = {
  blue: 'shadow-lg shadow-blue-500/50 dark:shadow-lg dark:shadow-blue-800/80',
  cyan: 'shadow-lg shadow-cyan-500/50 dark:shadow-lg dark:shadow-cyan-800/80',
  green: 'shadow-lg shadow-green-500/50 dark:shadow-lg dark:shadow-green-800/80',
  lime: 'shadow-lg shadow-lime-500/50 dark:shadow-lg dark:shadow-lime-800/80',
  pink: 'shadow-lg shadow-pink-500/50 dark:shadow-lg dark:shadow-pink-800/80',
  purple: 'shadow-lg shadow-purple-500/50 dark:shadow-lg dark:shadow-purple-800/80',
  red: 'shadow-lg shadow-red-500/50 dark:shadow-lg dark:shadow-red-800/80',
  teal: 'shadow-lg shadow-teal-500/50 dark:shadow-lg dark:shadow-teal-800/80',
}

export type UseButtonClassesProps = {
  class: Ref<string>
  pill: Ref<boolean>
  disabled: Ref<boolean>
  loading: Ref<boolean>
  outline: Ref<boolean>
  size: Ref<ButtonSize>
  square: Ref<boolean>
  color: Ref<ButtonVariant>
  gradient: Ref<ButtonGradient | null>
  shadow: Ref<ButtonMonochromeGradient | '' | null>
}

const simpleGradients = ['blue', 'green', 'cyan', 'teal', 'lime', 'red', 'pink', 'purple']
const alternativeColors = ['alternative', 'light']

export function useButtonClasses (props: UseButtonClassesProps): { wrapperClasses: string; spanClasses: string } {
  const slots = useSlots()

  const sizeClasses = computed(() => {
    if (props.square.value) return buttonSquareSizeClasses[props.size.value]
    return buttonSizeClasses[props.size.value]
  })

  const bindClasses = computed(() => {
    const isGradient = !!props.gradient.value
    const isColor = !!props.color.value
    const isOutline = props.outline.value

    let hoverClass = ''
    let backgroundClass = ''

    if (isGradient && isOutline) {
      // GRADIENT AND OUTLINE
      if (!simpleGradients.includes(props.gradient.value!)) {
        backgroundClass = buttonOutlineGradientClasses.default[props.gradient.value as unknown as keyof typeof buttonOutlineGradientClasses.default]

        if (!props.disabled.value) hoverClass = buttonOutlineGradientClasses.hover[props.gradient.value as unknown as keyof typeof buttonOutlineGradientClasses.hover]
      } else {
        console.warn(`cannot use outline prop with "${props.gradient.value}" gradient`) // TODO: prettify
      }
    } else if (isGradient) {
      // JUST GRADIENT
      backgroundClass = buttonGradientClasses.default[props.gradient.value!]

      if (!props.disabled.value) hoverClass = buttonGradientClasses.hover[props.gradient.value!]
    } else if (isColor && isOutline) {
      // COLOR AND OUTLINE
      if (!alternativeColors.includes(props.color.value)) {
        const color = props.color.value

        backgroundClass = buttonOutlineColorClasses.default[color as unknown as keyof typeof buttonOutlineColorClasses.default]

        if (!props.disabled.value) hoverClass = buttonOutlineColorClasses.hover[color as unknown as keyof typeof buttonOutlineColorClasses.hover]
      } else {
        console.warn(`cannot use outline prop with "${props.color.value}" color`) // TODO: prettify
      }
    } else {
      // JUST COLOR
      const color = props.color.value

      backgroundClass = buttonColorClasses.default[color as unknown as keyof typeof buttonColorClasses.default]

      if (!props.disabled.value) hoverClass = buttonColorClasses.hover[color as unknown as keyof typeof buttonColorClasses.hover]
    }

    let shadowClass = ''
    if (props.shadow.value === '') {
      // if shadow prop passed without value - try to find color for shadow by gradient
      if (props.gradient.value && simpleGradients.includes(props.gradient.value!)) {
        shadowClass = buttonShadowClasses[props.gradient.value as unknown as keyof typeof buttonShadowClasses]
      }
    } else if (typeof props.shadow.value === 'string') {
      // if provided color for shadow - use it
      if (simpleGradients.includes(props.shadow.value)) {
        shadowClass = buttonShadowClasses[props.shadow.value as unknown as keyof typeof buttonShadowClasses]
      }
    }

    return [
      backgroundClass,
      hoverClass,
      shadowClass,
      props.pill.value && '!rounded-full',
      props.disabled.value && 'cursor-not-allowed opacity-50',
      isGradient && isOutline ? 'p-0.5' : sizeClasses.value,
      (slots.prefix || slots.suffix || props.loading.value) && 'inline-flex items-center',
      props.class.value,
    ].filter((str) => (str)).join(' ')
  })

  const spanClasses = computed(() => {
    if (!!props.gradient.value && props.outline.value) {
      // ONLY FOR GRADIENT OUTLINE BUTTON
      return [
        'relative bg-white dark:bg-gray-900 rounded-md inline-flex items-center',
        sizeClasses.value,
        !props.disabled.value ? 'group-hover:bg-opacity-0 transition-all ease-in duration-75' : '',
      ].filter((str) => (str)).join(' ')
    }
    return ''
  })

  return {
    wrapperClasses: bindClasses.value,
    spanClasses: spanClasses.value,
  }
}