---
import Icon from './Icon.astro'

/** core/scss/ui/_switch-icon.scss `.switch-icon-{variant}` transition classes */
type SwitchIconVariant = 'fade' | 'scale' | 'flip' | 'slide-up' | 'slide-down' | 'slide-left' | 'slide-right' | 'slide-start' | 'slide-end'

interface Props {
  icon?: string
  /** icon shown in the on state; defaults to the filled variant of `icon` */
  activeIcon?: string | undefined
  /** text-{activeColor} on the switched-on icon */
  activeColor?: string
  variant?: SwitchIconVariant | undefined
  /** initial state: active + aria-pressed="true" */
  active?: boolean | undefined
  /** switch-icon-loading + aria-busy: spinner instead of the icons */
  loading?: boolean | undefined
  /** wraps the switch in a `btn btn-action`, which then carries the toggle, hover and focus */
  action?: boolean | undefined
  /** accessible name of the toggle; defaults to a label matching the icon */
  ariaLabel?: string | undefined
  class?: string | undefined
  /** remaining attributes (id, data-*, aria-*, …) are forwarded to the root element */
  [key: string]: unknown
}

const { icon = 'heart', activeIcon, activeColor = 'red', variant, active, loading, action, ariaLabel, class: className, ...rest } = Astro.props

const defaultLabels: Record<string, string> = { 'heart': 'Like', 'star': 'Add to favorites', 'bookmark': 'Bookmark', 'bell': 'Notify me', 'thumb-up': 'Vote up' }
const label = ariaLabel ?? defaultLabels[icon] ?? 'Toggle'

// Without an activeIcon, star/heart force the filled variant; otherwise no extra class.
const resolvedIconBClass = !activeIcon && (icon === 'star' || icon === 'heart') ? 'icon-filled' : undefined

const switchClass = ['switch-icon', variant && `switch-icon-${variant}`, active && 'active', loading && 'switch-icon-loading']
const rootAttrs = { 'data-bs-toggle': 'switch-icon', 'aria-pressed': active ? ('true' as const) : ('false' as const), 'aria-busy': loading ? ('true' as const) : undefined, 'aria-label': label, ...rest }
---

{
  action ? (
    <button type="button" class:list={['btn btn-action', className]} {...rootAttrs}>
      <span class:list={switchClass}>
        <span class="switch-icon-a">
          <Icon name={icon} />
        </span>
        <span class={`switch-icon-b text-${activeColor}`}>
          <Icon name={activeIcon ?? icon} class={resolvedIconBClass} />
        </span>
      </span>
    </button>
  ) : (
    <button type="button" class:list={[...switchClass, className]} {...rootAttrs}>
      <span class="switch-icon-a text-secondary">
        <Icon name={icon} />
      </span>
      <span class={`switch-icon-b text-${activeColor}`}>
        <Icon name={activeIcon ?? icon} class={resolvedIconBClass} />
      </span>
    </button>
  )
}