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/**
* MarkdownEditor — textarea + toolbar + preview tab.
*
* Lightweight by design: no WYSIWYG. The toolbar wraps the current
* selection in markdown syntax (e.g. select "foo" → click B → ``**foo**``).
* Cursor lands inside the wrap when the selection was empty, so the user
* can keep typing without manually nudging.
*
* Auto-resize behaviour is inlined from the previous AddAppsView
* implementation so we don't regress that view's look.
*/
import { ref, computed, nextTick, watch, onMounted } from 'vue'
import { useI18n } from 'vue-i18n'
import {
Bold, Italic, Heading1, Heading2, List, Link as LinkIcon,
Code as CodeIcon, Code2, Eye, Pencil,
} from 'lucide-vue-next'
import MarkdownRenderer from './MarkdownRenderer.vue'
const props = withDefaults(defineProps<{
modelValue: string
placeholder?: string
/** Minimum textarea height in px. Auto-resize grows past this. */
minHeightPx?: number
/** Hard cap on auto-resize. Scroll kicks in past this. */
maxHeightPx?: number
}>(), {
placeholder: '',
minHeightPx: 96,
maxHeightPx: 320,
})
const emit = defineEmits<{
(e: 'update:modelValue', value: string): void
}>()
const { t } = useI18n()
const mode = ref<'edit' | 'preview'>('edit')
const textareaRef = ref<HTMLTextAreaElement | null>(null)
const local = computed({
get: () => props.modelValue ?? '',
set: (v: string) => emit('update:modelValue', v),
})
// ----------------------------------------------------------------
// Auto-resize
// ----------------------------------------------------------------
const autoResize = () => {
const el = textareaRef.value
if (!el) return
el.style.height = 'auto'
el.style.height = `${Math.min(Math.max(el.scrollHeight, props.minHeightPx), props.maxHeightPx)}px`
}
// Re-size after the parent updates the model (e.g. clearing the form
// from the outside) and on mount once the textarea is in the DOM.
watch(() => props.modelValue, () => nextTick(autoResize))
onMounted(autoResize)
// ----------------------------------------------------------------
// Toolbar actions
// ----------------------------------------------------------------
type WrapAction = { prefix: string; suffix: string; placeholder: string }
type LinePrefixAction = { linePrefix: string; placeholder: string }
const setSelection = (start: number, end: number) => {
const el = textareaRef.value
if (!el) return
// Defer to after the v-model round-trip so the new value is in the
// textarea before we touch selectionStart/End.
nextTick(() => {
el.focus()
el.setSelectionRange(start, end)
autoResize()
})
}
const applyWrap = ({ prefix, suffix, placeholder }: WrapAction) => {
const el = textareaRef.value
if (!el) return
const start = el.selectionStart
const end = el.selectionEnd
const value = local.value
const selected = value.slice(start, end) || placeholder
const next = value.slice(0, start) + prefix + selected + suffix + value.slice(end)
local.value = next
const cursorStart = start + prefix.length
const cursorEnd = cursorStart + selected.length
setSelection(cursorStart, cursorEnd)
}
const applyLinePrefix = ({ linePrefix, placeholder }: LinePrefixAction) => {
const el = textareaRef.value
if (!el) return
const start = el.selectionStart
const end = el.selectionEnd
const value = local.value
// Expand selection to full lines so the prefix applies cleanly to a
// multi-line block (e.g. turning three pasted lines into a list).
const lineStart = value.lastIndexOf('\n', start - 1) + 1
const lineEnd = end === start ? end : (value.indexOf('\n', end - 1) === -1 ? value.length : value.indexOf('\n', end - 1))
const block = value.slice(lineStart, lineEnd === -1 ? value.length : lineEnd) || placeholder
const prefixed = block.split('\n').map(line => `${linePrefix}${line}`).join('\n')
const next = value.slice(0, lineStart) + prefixed + value.slice(lineEnd === -1 ? value.length : lineEnd)
local.value = next
setSelection(lineStart, lineStart + prefixed.length)
}
const applyLink = () => {
const el = textareaRef.value
if (!el) return
const start = el.selectionStart
const end = el.selectionEnd
const value = local.value
const selected = value.slice(start, end) || t('markdownEditor.linkText')
// ``url`` placeholder gets highlighted so the user can immediately
// overwrite it; that's what most editors do.
const insertion = `[${selected}](url)`
const next = value.slice(0, start) + insertion + value.slice(end)
local.value = next
const urlStart = start + selected.length + 3 // after "[selected]("
const urlEnd = urlStart + 3 // "url"
setSelection(urlStart, urlEnd)
}
const applyCodeBlock = () => {
const el = textareaRef.value
if (!el) return
const start = el.selectionStart
const end = el.selectionEnd
const value = local.value
const selected = value.slice(start, end) || t('markdownEditor.codePlaceholder')
// Always wrap with newlines so we don't accidentally inline-merge with
// the surrounding paragraph.
const insertion = `\n\`\`\`\n${selected}\n\`\`\`\n`
const next = value.slice(0, start) + insertion + value.slice(end)
local.value = next
const codeStart = start + 5 // skip ``\n```\n``
const codeEnd = codeStart + selected.length
setSelection(codeStart, codeEnd)
}
// ----------------------------------------------------------------
// Keyboard shortcuts (Ctrl/Cmd-B, Ctrl/Cmd-I)
// ----------------------------------------------------------------
const onKeydown = (e: KeyboardEvent) => {
const meta = e.ctrlKey || e.metaKey
if (!meta) return
if (e.key === 'b' || e.key === 'B') {
e.preventDefault()
applyWrap({ prefix: '**', suffix: '**', placeholder: t('markdownEditor.boldPlaceholder') })
} else if (e.key === 'i' || e.key === 'I') {
e.preventDefault()
applyWrap({ prefix: '_', suffix: '_', placeholder: t('markdownEditor.italicPlaceholder') })
}
}
// ----------------------------------------------------------------
// Toolbar button declarations
// ----------------------------------------------------------------
const onBold = () =>
applyWrap({ prefix: '**', suffix: '**', placeholder: t('markdownEditor.boldPlaceholder') })
const onItalic = () =>
applyWrap({ prefix: '_', suffix: '_', placeholder: t('markdownEditor.italicPlaceholder') })
const onInlineCode = () =>
applyWrap({ prefix: '`', suffix: '`', placeholder: t('markdownEditor.codePlaceholder') })
const onH1 = () =>
applyLinePrefix({ linePrefix: '# ', placeholder: t('markdownEditor.headingPlaceholder') })
const onH2 = () =>
applyLinePrefix({ linePrefix: '## ', placeholder: t('markdownEditor.headingPlaceholder') })
const onList = () =>
applyLinePrefix({ linePrefix: '- ', placeholder: t('markdownEditor.listPlaceholder') })
</script>
<template>
<div class="w-full rounded-lg border border-gray-200 bg-white shadow-sm overflow-hidden">
<!-- Tab bar -->
<div class="flex items-center gap-0.5 border-b border-gray-200 bg-gray-50 px-2">
<button
type="button"
@click="mode = 'edit'"
class="flex items-center gap-1.5 px-3 py-1.5 text-xs font-medium border-b-2 transition-colors -mb-px"
:class="mode === 'edit'
? 'border-primary text-primary'
: 'border-transparent text-gray-500 hover:text-gray-800'"
>
<Pencil :size="12" />
{{ t('markdownEditor.tabEdit') }}
</button>
<button
type="button"
@click="mode = 'preview'"
class="flex items-center gap-1.5 px-3 py-1.5 text-xs font-medium border-b-2 transition-colors -mb-px"
:class="mode === 'preview'
? 'border-primary text-primary'
: 'border-transparent text-gray-500 hover:text-gray-800'"
>
<Eye :size="12" />
{{ t('markdownEditor.tabPreview') }}
</button>
<!-- Toolbar (edit mode only) -->
<div
v-if="mode === 'edit'"
class="ml-auto flex items-center gap-0.5 py-1"
>
<button type="button" @click="onBold" :title="t('markdownEditor.toolbar.bold')"
class="p-1 rounded hover:bg-gray-200 text-gray-600">
<Bold :size="14" />
</button>
<button type="button" @click="onItalic" :title="t('markdownEditor.toolbar.italic')"
class="p-1 rounded hover:bg-gray-200 text-gray-600">
<Italic :size="14" />
</button>
<span class="mx-1 h-4 w-px bg-gray-300"></span>
<button type="button" @click="onH1" :title="t('markdownEditor.toolbar.h1')"
class="p-1 rounded hover:bg-gray-200 text-gray-600">
<Heading1 :size="14" />
</button>
<button type="button" @click="onH2" :title="t('markdownEditor.toolbar.h2')"
class="p-1 rounded hover:bg-gray-200 text-gray-600">
<Heading2 :size="14" />
</button>
<span class="mx-1 h-4 w-px bg-gray-300"></span>
<button type="button" @click="onList" :title="t('markdownEditor.toolbar.list')"
class="p-1 rounded hover:bg-gray-200 text-gray-600">
<List :size="14" />
</button>
<button type="button" @click="applyLink" :title="t('markdownEditor.toolbar.link')"
class="p-1 rounded hover:bg-gray-200 text-gray-600">
<LinkIcon :size="14" />
</button>
<button type="button" @click="onInlineCode" :title="t('markdownEditor.toolbar.code')"
class="p-1 rounded hover:bg-gray-200 text-gray-600">
<CodeIcon :size="14" />
</button>
<button type="button" @click="applyCodeBlock" :title="t('markdownEditor.toolbar.codeblock')"
class="p-1 rounded hover:bg-gray-200 text-gray-600">
<Code2 :size="14" />
</button>
</div>
</div>
<!-- Edit / Preview body -->
<div class="p-2">
<textarea
v-show="mode === 'edit'"
ref="textareaRef"
v-model="local"
:placeholder="placeholder"
@input="autoResize"
@keydown="onKeydown"
:style="{ minHeight: `${minHeightPx}px`, maxHeight: `${maxHeightPx}px` }"
class="block w-full resize-none rounded-md border border-transparent bg-white px-2 py-1.5 text-sm text-gray-700 focus:ring-2 focus:ring-primary focus:border-primary outline-none font-mono overflow-y-auto"
/>
<div
v-show="mode === 'preview'"
class="px-2 py-1.5 text-sm"
:style="{ minHeight: `${minHeightPx}px` }"
>
<MarkdownRenderer v-if="local.trim()" :source="local" variant="full" />
<p v-else class="text-gray-400 italic">{{ t('markdownEditor.emptyPreview') }}</p>
</div>
</div>
</div>
</template>
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