<template>
  <div :class="mergedGroupClass">
    <label
      v-if="label"
      :for="editorId"
      :class="mergedLabelClass"
    >
      {{ label }}
    </label>

    <!-- Mode lecture seule (rendu uniquement) -->
    <div
      v-if="!editable"
      :id="editorId"
      :class="mergedReadonlyClass"
    >
      <EditorContent :editor="editor" />
    </div>

    <!-- Mode éditable -->
    <div
      v-else
      :id="editorId"
      :class="mergedEditorWrapperClass"
      @click="focusEditor"
    >
      <div
        class="flex flex-wrap items-center gap-0.5 border-b border-m-border bg-m-bg p-1"
        @click.stop
      >
        <button
          v-for="btn in toolbarButtons"
          :key="btn.key"
          type="button"
          class="flex h-8 w-8 items-center justify-center rounded text-m-text transition-colors hover:bg-m-primary/10 disabled:cursor-not-allowed disabled:opacity-40"
          :class="btn.isActive() ? 'bg-m-primary/15 text-m-primary' : ''"
          :title="btn.title"
          :disabled="disabled || readonly"
          :aria-label="btn.title"
          :aria-pressed="btn.isActive()"
          @mousedown.prevent
          @click="btn.action()"
        >
          <IconifyIcon :icon="btn.icon" :width="18" :height="18" />
        </button>

        <span class="mx-1 h-5 w-px bg-m-border" aria-hidden="true" />

        <button
          type="button"
          class="flex h-8 w-8 items-center justify-center rounded text-m-text transition-colors hover:bg-m-primary/10 disabled:cursor-not-allowed disabled:opacity-40"
          title="Annuler"
          aria-label="Annuler"
          :disabled="disabled || readonly || !editor?.can().undo()"
          @mousedown.prevent
          @click="editor?.chain().focus().undo().run()"
        >
          <IconifyIcon icon="mdi:undo" :width="18" :height="18" />
        </button>
        <button
          type="button"
          class="flex h-8 w-8 items-center justify-center rounded text-m-text transition-colors hover:bg-m-primary/10 disabled:cursor-not-allowed disabled:opacity-40"
          title="Rétablir"
          aria-label="Rétablir"
          :disabled="disabled || readonly || !editor?.can().redo()"
          @mousedown.prevent
          @click="editor?.chain().focus().redo().run()"
        >
          <IconifyIcon icon="mdi:redo" :width="18" :height="18" />
        </button>
      </div>

      <EditorContent
        :editor="editor"
        class="malio-rich-text flex flex-1 cursor-text"
        :style="{ minHeight }"
        :aria-invalid="hasError || undefined"
        :aria-describedby="describedBy"
      />
    </div>

    <p
      v-if="hint || hasError || hasSuccess"
      :id="`${editorId}-describedby`"
      :class="[
        hasError
          ? 'text-m-danger'
          : hasSuccess
            ? 'text-m-success'
            : 'text-m-muted',
        'mt-1 text-xs ml-[2px]',
      ]"
    >
      {{ error || success || hint }}
    </p>
  </div>
</template>

<script setup lang="ts">
import { computed, onBeforeUnmount, onMounted, shallowRef, useId, watch } from 'vue'
import { Icon as IconifyIcon } from '@iconify/vue'
import { Editor, EditorContent } from '@tiptap/vue-3'
import StarterKit from '@tiptap/starter-kit'
import Placeholder from '@tiptap/extension-placeholder'
import { Markdown } from 'tiptap-markdown'
import { twMerge } from 'tailwind-merge'

defineOptions({ name: 'MalioInputRichText', inheritAttrs: false })

type OutputFormat = 'markdown' | 'html'

const props = withDefaults(
  defineProps<{
    id?: string
    label?: string
    modelValue?: string | null | undefined
    placeholder?: string
    minHeight?: string
    editable?: boolean
    disabled?: boolean
    readonly?: boolean
    hint?: string
    error?: string
    success?: string
    outputFormat?: OutputFormat
    groupClass?: string
    labelClass?: string
    editorClass?: string
  }>(),
  {
    id: '',
    label: '',
    modelValue: undefined,
    placeholder: '',
    minHeight: '160px',
    editable: true,
    disabled: false,
    readonly: false,
    hint: '',
    error: '',
    success: '',
    outputFormat: 'markdown',
    groupClass: '',
    labelClass: '',
    editorClass: '',
  },
)

const emit = defineEmits<{
  (event: 'update:modelValue', value: string): void
}>()

const generatedId = useId()
const editor = shallowRef<Editor>()
const isFocused = shallowRef(false)

const editorId = computed(() => props.id?.toString() || `malio-input-rich-text-${generatedId}`)
const hasError = computed(() => !!props.error)
const hasSuccess = computed(() => !!props.success && !hasError.value)
const isInteractionLocked = computed(() => props.disabled || props.readonly)

const describedBy = computed(() =>
  hasError.value || hasSuccess.value || props.hint ? `${editorId.value}-describedby` : undefined,
)

const mergedGroupClass = computed(() => twMerge('w-full', props.groupClass))

const mergedLabelClass = computed(() =>
  twMerge(
    'mb-1 block text-sm font-medium',
    hasError.value
      ? 'text-m-danger'
      : hasSuccess.value
        ? 'text-m-success'
        : isFocused.value
          ? 'text-m-primary'
          : 'text-m-text',
    props.disabled ? 'text-black/60' : '',
    props.labelClass,
  ),
)

const mergedEditorWrapperClass = computed(() =>
  twMerge(
    'rich-text-wrapper flex flex-col overflow-hidden rounded-md border bg-white transition-colors',
    hasError.value
      ? 'border-m-danger focus-within:border-m-danger'
      : hasSuccess.value
        ? 'border-m-success focus-within:border-m-success'
        : isFocused.value
          ? 'border-m-primary'
          : 'border-m-muted hover:border-m-text/60',
    props.disabled ? 'cursor-not-allowed bg-m-bg/50 opacity-70' : '',
    props.editorClass,
  ),
)

const mergedReadonlyClass = computed(() =>
  twMerge(
    'malio-rich-text prose prose-sm max-w-none rounded-md border border-m-border bg-white p-3',
    'prose-headings:font-semibold prose-a:text-m-primary',
    'prose-code:rounded prose-code:bg-m-bg prose-code:px-1.5 prose-code:py-0.5 prose-code:before:content-none prose-code:after:content-none',
    'prose-pre:bg-m-text prose-pre:text-white',
    props.editorClass,
  ),
)

const focusEditor = () => {
  if (isInteractionLocked.value) return
  editor.value?.commands.focus()
}

const promptForLink = () => {
  if (!editor.value) return
  const previous = editor.value.getAttributes('link').href as string | undefined
  const url = window.prompt('URL du lien (vide pour retirer)', previous ?? '')
  if (url === null) return
  if (url === '') {
    editor.value.chain().focus().extendMarkRange('link').unsetLink().run()
    return
  }
  editor.value.chain().focus().extendMarkRange('link').setLink({ href: url }).run()
}

const toolbarButtons = computed(() => {
  const e = editor.value
  return [
    { key: 'bold', icon: 'mdi:format-bold', title: 'Gras', isActive: () => !!e?.isActive('bold'), action: () => e?.chain().focus().toggleBold().run() },
    { key: 'italic', icon: 'mdi:format-italic', title: 'Italique', isActive: () => !!e?.isActive('italic'), action: () => e?.chain().focus().toggleItalic().run() },
    { key: 'strike', icon: 'mdi:format-strikethrough', title: 'Barré', isActive: () => !!e?.isActive('strike'), action: () => e?.chain().focus().toggleStrike().run() },
    { key: 'h2', icon: 'mdi:format-header-2', title: 'Titre H2', isActive: () => !!e?.isActive('heading', { level: 2 }), action: () => e?.chain().focus().toggleHeading({ level: 2 }).run() },
    { key: 'h3', icon: 'mdi:format-header-3', title: 'Titre H3', isActive: () => !!e?.isActive('heading', { level: 3 }), action: () => e?.chain().focus().toggleHeading({ level: 3 }).run() },
    { key: 'bulletList', icon: 'mdi:format-list-bulleted', title: 'Liste à puces', isActive: () => !!e?.isActive('bulletList'), action: () => e?.chain().focus().toggleBulletList().run() },
    { key: 'orderedList', icon: 'mdi:format-list-numbered', title: 'Liste numérotée', isActive: () => !!e?.isActive('orderedList'), action: () => e?.chain().focus().toggleOrderedList().run() },
    { key: 'blockquote', icon: 'mdi:format-quote-close', title: 'Citation', isActive: () => !!e?.isActive('blockquote'), action: () => e?.chain().focus().toggleBlockquote().run() },
    { key: 'code', icon: 'mdi:code-tags', title: 'Code inline', isActive: () => !!e?.isActive('code'), action: () => e?.chain().focus().toggleCode().run() },
    { key: 'codeBlock', icon: 'mdi:code-braces-box', title: 'Bloc de code', isActive: () => !!e?.isActive('codeBlock'), action: () => e?.chain().focus().toggleCodeBlock().run() },
    { key: 'link', icon: 'mdi:link-variant', title: 'Lien', isActive: () => !!e?.isActive('link'), action: promptForLink },
  ]
})

const getCurrentValue = (): string => {
  if (!editor.value) return ''
  if (props.outputFormat === 'html') return editor.value.getHTML()
  const storage = editor.value.storage.markdown as { getMarkdown: () => string } | undefined
  return storage ? storage.getMarkdown() : editor.value.getHTML()
}

onMounted(() => {
  editor.value = new Editor({
    content: props.modelValue ?? '',
    editable: props.editable && !props.disabled && !props.readonly,
    extensions: [
      StarterKit.configure({
        heading: { levels: [2, 3] },
        link: {
          openOnClick: false,
          autolink: true,
          HTMLAttributes: { rel: 'noopener noreferrer nofollow', target: '_blank' },
        },
      }),
      Placeholder.configure({
        placeholder: props.placeholder,
      }),
      Markdown.configure({
        html: false,
        tightLists: true,
        bulletListMarker: '-',
        linkify: true,
        breaks: false,
        transformPastedText: true,
        transformCopiedText: true,
      }),
    ],
    editorProps: {
      attributes: {
        class: 'prose prose-sm max-w-none w-full p-3 focus:outline-none prose-headings:font-semibold prose-a:text-m-primary prose-code:rounded prose-code:bg-m-bg prose-code:px-1.5 prose-code:py-0.5 prose-code:before:content-none prose-code:after:content-none prose-pre:bg-m-text prose-pre:text-white',
      },
    },
    onUpdate: () => {
      emit('update:modelValue', getCurrentValue())
    },
    onFocus: () => {
      isFocused.value = true
    },
    onBlur: () => {
      isFocused.value = false
    },
  })
})

onBeforeUnmount(() => {
  editor.value?.destroy()
})

watch(() => props.modelValue, (incoming) => {
  if (!editor.value) return
  if ((incoming ?? '') === getCurrentValue()) return
  editor.value.commands.setContent(incoming ?? '', { emitUpdate: false })
})

watch(() => [props.editable, props.disabled, props.readonly], () => {
  editor.value?.setEditable(props.editable && !props.disabled && !props.readonly)
})
</script>

<style scoped>
.malio-rich-text :deep(.ProseMirror) {
  outline: none;
  flex: 1 1 auto;
  min-width: 0;
}
.malio-rich-text :deep(.ProseMirror > *:first-child) {
  margin-top: 0;
}
.malio-rich-text :deep(.ProseMirror > *:last-child) {
  margin-bottom: 0;
}
.malio-rich-text :deep(.ProseMirror p.is-editor-empty:first-child::before) {
  content: attr(data-placeholder);
  float: left;
  color: rgb(var(--m-muted));
  pointer-events: none;
  height: 0;
}
</style>
