<script lang="ts">
import { tv, type VariantProps } from 'tailwind-variants'
import type { SwitchRootProps } from 'radix-vue'
import type { AppConfig } from '@nuxt/schema'
import _appConfig from '#build/app.config'
import theme from '#build/ui/switch'

const appConfig = _appConfig as AppConfig & { ui: { switch: Partial<typeof theme> } }

const switchTv = tv({ extend: tv(theme), ...(appConfig.ui?.switch || {}) })

type SwitchVariants = VariantProps<typeof switchTv>

export interface SwitchProps extends Omit<SwitchRootProps, 'asChild' | 'checked' | 'defaultChecked'> {
  color?: SwitchVariants['color']
  size?: SwitchVariants['size']
  loading?: boolean
  loadingIcon?: string
  checkedIcon?: string
  uncheckedIcon?: string
  label?: string
  description?: string
  defaultValue?: boolean
  class?: any
  ui?: Partial<typeof switchTv.slots>
}

export interface SwitchSlots {
  label(props: { label?: string }): any
  description(props: { description?: string }): any
}
</script>

<script setup lang="ts">
import { computed } from 'vue'
import { SwitchRoot, SwitchThumb, useForwardProps, Label } from 'radix-vue'
import { reactivePick } from '@vueuse/core'
import { useId, useAppConfig, useFormField } from '#imports'

const props = defineProps<SwitchProps>()
defineSlots<SwitchSlots>()

const modelValue = defineModel<boolean | undefined>({ default: undefined })

const appConfig = useAppConfig()
const rootProps = useForwardProps(reactivePick(props, 'as', 'required', 'value'))

const { id: _id, emitFormChange, size, color, name, disabled } = useFormField<SwitchProps>(props)
const id = _id.value ?? useId()

const ui = computed(() => tv({ extend: switchTv, slots: props.ui })({
  size: size.value,
  color: color.value,
  required: props.required,
  loading: props.loading,
  disabled: disabled.value || props.loading
}))

// FIXME: I think there's a race condition between this and the v-model event.
// This must be triggered after the value updates, otherwise the form validates
// the previous value.
async function onChecked() {
  emitFormChange()
}
</script>

<template>
  <div :class="ui.root({ class: props.class })">
    <div :class="ui.container()">
      <SwitchRoot
        :id="id"
        v-model:checked="modelValue"
        :default-checked="defaultValue"
        v-bind="rootProps"
        :name="name"
        :disabled="disabled || loading"
        :class="ui.base()"
        @update:checked="onChecked"
      >
        <SwitchThumb :class="ui.thumb()">
          <UIcon v-if="loading" :name="loadingIcon || appConfig.ui.icons.loading" :class="ui.icon({ checked: true, unchecked: true })" />
          <template v-else>
            <UIcon v-if="checkedIcon" :name="checkedIcon" :class="ui.icon({ checked: true })" />
            <UIcon v-if="uncheckedIcon" :name="uncheckedIcon" :class="ui.icon({ unchecked: true })" />
          </template>
        </SwitchThumb>
      </SwitchRoot>
    </div>
    <div v-if="(label || $slots.label) || (description || $slots.description)" :class="ui.wrapper()">
      <Label v-if="label || $slots.label" :for="id" :class="ui.label()">
        <slot name="label" :label="label">
          {{ label }}
        </slot>
      </Label>
      <p v-if="description || $slots.description" :class="ui.description()">
        <slot name="description" :description="description">
          {{ description }}
        </slot>
      </p>
    </div>
  </div>
</template>
