---
// Form group: label (.form-label) + control slot + optional hint (.form-text).
// When `for` is omitted and associate is true (default), the control is nested
// inside the label for implicit association. Set associate={false} for groups
// with multiple controls.
import FormText from './FormText.astro'

interface Props {
  label?: string
  /** .required asterisk on the label — also set required on the control */
  required?: boolean
  /** .form-label-description at the inline end of the label */
  description?: string
  /** .form-text under the control */
  hint?: string
  /** for attribute of the label — must match the slotted control's id */
  for?: string
  /** extra classes on the label (e.g. visually-hidden) */
  labelClass?: string
  /** wrapper classes; replaces the default mb-3 */
  class?: string
  /** marks the group invalid — pair with aria-invalid and .is-invalid on the control */
  invalid?: boolean
  /** error message shown under the control (.invalid-feedback) */
  error?: string
  /** nest the control in the label when `for` is omitted (default true) */
  associate?: boolean
}

const { label, required, description, hint, for: htmlFor, labelClass, class: className = 'mb-3', invalid, error, associate = true } = Astro.props

// Hint/error ids exist only when the caller provides `for` — an auto-derived
// id is unreferenceable by the slotted control anyway, and label-based slugs
// collide between same-label groups on one page.
const hintId = hint && htmlFor ? `${htmlFor}-hint` : undefined
const errorId = error && htmlFor ? `${htmlFor}-error` : undefined
const wrapLabel = Boolean(label && !htmlFor && associate)
---

<div class:list={[className, invalid && 'has-validation']}>
  {
    label && htmlFor && (
      <label class:list={['form-label', required && 'required', labelClass]} for={htmlFor}>
        {label}
        {required && <span class="visually-hidden"> (required)</span>}
        {description && <span class="form-label-description">{description}</span>}
      </label>
    )
  }
  {
    label && !htmlFor && !associate && (
      <div class:list={['form-label', required && 'required', labelClass]}>
        {label}
        {description && <span class="form-label-description">{description}</span>}
      </div>
    )
  }
  {
    wrapLabel ? (
      <label class="d-block">
        <span class:list={['form-label', required && 'required', labelClass]}>
          {label}
          {required && <span class="visually-hidden"> (required)</span>}
          {description && <span class="form-label-description">{description}</span>}
        </span>
        <slot />
      </label>
    ) : (
      <slot />
    )
  }
  {
    error && (
      <div class="invalid-feedback d-block" id={errorId} role="alert">
        {error}
      </div>
    )
  }
  {hint && <FormText id={hintId}>{hint}</FormText>}
</div>