import { computed, toValue, type MaybeRefOrGetter } from 'vue'
import { useAppConfig } from '#imports'
import type { AvatarProps } from '../types'

export interface UseComponentIconsProps {
  /**
   * Display an icon based on the `leading` and `trailing` props.
   * @IconifyIcon
   */
  icon?: string
  /** Display an avatar on the left side. */
  avatar?: AvatarProps
  /** When `true`, the icon will be displayed on the left side. */
  leading?: boolean
  /**
   * Display an icon on the left side.
   * @IconifyIcon
   */
  leadingIcon?: string
  /** When `true`, the icon will be displayed on the right side. */
  trailing?: boolean
  /**
   * Display an icon on the right side.
   * @IconifyIcon
   */
  trailingIcon?: string
  /** When `true`, the loading icon will be displayed. */
  loading?: boolean
  /**
   * The icon when the `loading` prop is `true`.
   * @defaultValue appConfig.ui.icons.loading
   * @IconifyIcon
   */
  loadingIcon?: string
}

export function useComponentIcons(componentProps: MaybeRefOrGetter<UseComponentIconsProps>) {
  const appConfig = useAppConfig()

  const props = computed(() => toValue(componentProps))

  const isLeading = computed(() => (props.value.icon && props.value.leading) || (props.value.icon && !props.value.trailing) || (props.value.loading && !props.value.trailing) || !!props.value.leadingIcon)
  const isTrailing = computed(() => (props.value.icon && props.value.trailing) || (props.value.loading && props.value.trailing) || !!props.value.trailingIcon)

  const leadingIconName = computed(() => {
    if (props.value.loading) {
      return props.value.loadingIcon || appConfig.ui.icons.loading
    }

    return props.value.leadingIcon || props.value.icon
  })
  const trailingIconName = computed(() => {
    if (props.value.loading && !isLeading.value) {
      return props.value.loadingIcon || appConfig.ui.icons.loading
    }

    return props.value.trailingIcon || props.value.icon
  })

  return {
    isLeading,
    isTrailing,
    leadingIconName,
    trailingIconName
  }
}