<template>
  <div class="ai-input-area">
    <!-- 已选技能 chip（含参数格式提示 argument_hint） -->
    <div v-if="pendingSkill" class="ai-skill-chip">
      <span class="ai-skill-chip-main">
        <span class="ai-skill-chip-name">/{{ pendingSkill.name }}</span>
        <span v-if="pendingSkill.description" class="ai-skill-chip-desc">{{ pendingSkill.description }}</span>
        <code v-if="pendingSkill.argument_hint" class="ai-skill-chip-hint">{{ pendingSkill.argument_hint }}</code>
      </span>
      <button class="ai-skill-chip-x" @click="clearSkill" :title="$t('aiChat.clearSkill')" :aria-label="$t('aiChat.clearSkill')">×</button>
    </div>
    <div class="ai-input-wrap">
      <!-- F-260614-05 Phase 2b: 待发送图片预览(粘贴/拖拽加入,发送前可移除) -->
      <div v-if="pendingImages.length" class="ai-img-preview-row">
        <div v-for="img in pendingImages" :key="img.id" class="ai-img-preview">
          <img :src="img.dataUrl" :alt="$t('aiChat.imagePreviewAlt')" class="ai-img-preview-thumb" />
          <button
            type="button"
            class="ai-img-preview-x"
            :title="$t('aiChat.removeImage')"
            :aria-label="$t('aiChat.removeImage')"
            @click="removePendingImage(img.id)"
          >×</button>
        </div>
      </div>
      <textarea
        ref="inputEl"
        v-model="inputText"
        class="ai-input"
        :class="{ 'ai-input--editing': !!editingMsgId }"
        :placeholder="editingMsgId
          ? $t('aiChat.placeholderEditing')
          : (pendingSkill ? (pendingSkill.argument_hint || $t('aiChat.placeholderWithSkill')) : $t('aiChat.placeholderDefault'))"
        rows="1"
        @keydown="handleKeydown"
        @input="autoResize"
        @paste="onPaste"
        @dragover="onDragOver"
        @drop="onDrop"
      ></textarea>
      <!-- 技能联想浮层 -->
      <div v-if="skillOpen" class="ai-skill-popover">
        <div v-if="!filteredSkills.length" class="ai-skill-empty">
          {{ store.state.skills.length ? $t('aiChat.skillNoMatch') : $t('aiChat.skillNotLoaded') }}
        </div>
        <div
          v-for="(s, i) in filteredSkills"
          :key="s.path"
          class="ai-skill-item"
          :class="{ 'ai-skill-item--active': i === skillIndex }"
          @click="selectSkill(s)"
          @mouseenter="skillIndex = i"
        >
          <div class="ai-skill-item-row">
            <span class="ai-skill-item-name">/{{ s.name }}</span>
            <span class="ai-skill-item-desc">{{ s.description }}</span>
            <span class="ai-skill-item-src">{{ s.source }}</span>
          </div>
          <code v-if="s.argument_hint" class="ai-skill-item-hint">{{ s.argument_hint }}</code>
        </div>
      </div>
      <!-- UX-10 §1.4: @ 实体引用浮层(@ 触发,选中插入 [类型:名] 标记,架构复用技能 popover) -->
      <div v-if="mentionOpen" class="ai-skill-popover ai-mention-popover">
        <div v-if="!mentionItems.length" class="ai-skill-empty">
          {{ mentionTotal ? $t('aiChat.mentionNoMatch') : $t('aiChat.mentionEmpty') }}
        </div>
        <div v-else>
          <template v-for="g in mentionGroups" :key="g.key">
            <div v-if="g.items.length" class="ai-mention-group">{{ g.label }}</div>
            <div
              v-for="item in g.items"
              :key="item.uid"
              class="ai-skill-item"
              :class="{ 'ai-skill-item--active': mentionFlatIndex(item.uid) === mentionIndex }"
              @click="selectMention(item)"
              @mouseenter="mentionIndex = mentionFlatIndex(item.uid)"
            >
              <div class="ai-skill-item-row">
                <span class="ai-mention-item-type" :class="'ai-mention-item-type--' + item.type">{{ item.typeLabel }}</span>
                <span class="ai-mention-item-name">{{ item.name }}</span>
                <span class="ai-mention-item-desc">{{ item.desc }}</span>
              </div>
            </div>
          </template>
        </div>
      </div>
      <button
        v-if="store.state.streaming"
        class="ai-send-btn ai-send-btn--stop"
        :title="$t('aiChat.stopGenerating')"
        @click="store.stopChat"
      >
        <svg width="12" height="12" viewBox="0 0 24 24" fill="currentColor"><rect x="6" y="6" width="12" height="12" rx="2"/></svg>
      </button>
      <button
        v-else
        class="ai-send-btn"
        :class="{ 'ai-send-btn--active': canSend }"
        :disabled="!canSend"
        @click="handleSend"
      >
        <svg width="14" height="14" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><line x1="22" y1="2" x2="11" y2="13"/><polygon points="22 2 15 22 11 13 2 9 22 2"/></svg>
      </button>
    </div>
    <div class="ai-input-hint">{{ $t('aiChat.inputHint') }}</div>
  </div>
</template>

<script setup lang="ts">
// ChatInput: AI 输入框子组件(第二批抽离自 AiChat.vue God 组件)
// 职责:输入框 textarea + 附件(图片粘贴/拖拽)+ 技能 `/` 联想 + `@` 实体引用 + 发送/停止按钮
// 边界(交父处理):
//   - editingMsgId 由父持有(prop),startEdit/cancelEdit 由父操作 prop + 调本组件 expose
//   - 发送/编辑完成 emit('sent') → 父 scrollToBottom
//   - 出错 emit('error', { msg, type }) → 父 showToast(单一 toast 源)
//   - 示例问题卡片在父(空状态区),父调 expose sendExamplePrompt 触发本组件发送
// store 单例共享:useAiStore(sendMessage/editMessage/stopChat)、useProjectStore(@ 联想源)
import { ref, computed, nextTick, watch } from 'vue'
import { useI18n } from 'vue-i18n'
import { useAiStore } from '../../stores/ai'
import { useProjectStore } from '../../stores/project'
import type { AiMessage, ContentPart, SkillInfo, ProjectRecord, TaskRecord } from '../../api/types'

const props = defineProps<{
  /** UX-09: 编辑末条 user 消息态;父持有,handleSend 据此走 editMessage 而非 sendMessage */
  editingMsgId: string | null
}>()

const emit = defineEmits<{
  /** 发送或编辑完成(父 scrollToBottom) */
  (e: 'sent'): void
  /** 出错提示(父 showToast,保持单一 toast 源) */
  (e: 'error', payload: { msg: string; type: 'error' | 'warning' | 'info' }): void
  /** UX-09 编辑态取消(Esc / 编辑完成清 editingMsgId) */
  (e: 'cancel-edit'): void
}>()

const store = useAiStore()
const projectsStore = useProjectStore()
const { t } = useI18n()

const inputText = ref('')
const inputEl = ref<HTMLTextAreaElement>()

// ── F-260614-05 Phase 2b: 图片输入(粘贴/拖拽) ──
// 待发送图片列表(base64 data URI + media_type),handleSend 时构造 ContentPart[]。
// 仅本组件级 ref,不入 store;发送后清空。预览缩略图渲染在输入框上方。
//
// 约束:
// - 限制单次最多 6 张(防超长上下文/超限请求);超过 toast 提示。
// - 限制单张 10MB(纯文本 base64 估算 ≥ 13M 字符;超限 toast 提示跳过)。
// - 仅接受 image/* MIME;非图片(文本粘贴/文件拖入)走原生行为不拦。
const MAX_PENDING_IMAGES = 6
const MAX_IMAGE_BYTES = 10 * 1024 * 1024 // 10MB(解码后字节上限)
const pendingImages = ref<{ id: string; dataUrl: string; mediaType: string }[]>([])

/** 读 File → base64 data URL(供 <img> 预览 + ContentPart.image base64 字段) */
function readImageFile(file: File): Promise<string> {
  return new Promise((resolve, reject) => {
    const reader = new FileReader()
    reader.onload = () => resolve(reader.result as string)
    reader.onerror = () => reject(reader.error ?? new Error('read failed'))
    reader.readAsDataURL(file)
  })
}

/** 把 image File 加入 pendingImages;超限/超大小跳过并 toast */
async function addImageFile(file: File): Promise<void> {
  if (!file.type.startsWith('image/')) return
  if (file.size > MAX_IMAGE_BYTES) {
    emit('error', { msg: t('aiChat.imageTooLarge'), type: 'warning' })
    return
  }
  if (pendingImages.value.length >= MAX_PENDING_IMAGES) {
    emit('error', { msg: t('aiChat.imageLimit', { n: MAX_PENDING_IMAGES }), type: 'warning' })
    return
  }
  try {
    const dataUrl = await readImageFile(file)
    pendingImages.value.push({
      // id 用 timestamp+random,DOM key 唯一,移除按钮定位
      id: `img-${Date.now()}-${Math.random().toString(36).slice(2, 8)}`,
      dataUrl,
      mediaType: file.type,
    })
  } catch (e) {
    emit('error', { msg: t('aiChat.imageReadFailed'), type: 'error' })
    console.error('[AI] 图片读取失败:', e)
  }
}

/** 移除待发送图片 */
function removePendingImage(id: string): void {
  pendingImages.value = pendingImages.value.filter(p => p.id !== id)
}

/** 粘贴:ClipboardEvent 检测 image 类型条目,加入待发送列表(不插入文本占位) */
async function onPaste(e: ClipboardEvent): Promise<void> {
  const items = e.clipboardData?.items
  if (!items) return
  const files: File[] = []
  for (let i = 0; i < items.length; i++) {
    const it = items[i]
    if (it.kind === 'file' && it.type.startsWith('image/')) {
      const f = it.getAsFile()
      if (f) files.push(f)
    }
  }
  if (files.length === 0) return
  // 含图片:阻止默认粘贴(避免把图片的二进制当文本塞进 textarea),逐个加入
  e.preventDefault()
  for (const f of files) await addImageFile(f)
}

/** 拖拽进入:仅允许图片,preventDefault 让 drop 事件触发 */
function onDragOver(e: DragEvent): void {
  if (!e.dataTransfer) return
  // 判断当前是否含 image/* 类型(copy/move 光标提示)
  const hasImage = Array.from(e.dataTransfer.types).includes('Files')
  if (hasImage) {
    e.preventDefault()
    e.dataTransfer.dropEffect = 'copy'
  }
}

/** 拖拽放下:取出图片 File,加入待发送 */
async function onDrop(e: DragEvent): Promise<void> {
  const files = e.dataTransfer?.files
  if (!files || files.length === 0) return
  // 仅处理图片文件(非图片拖入走原生不拦,但这里 preventDefault 已无副作用)
  const images = Array.from(files).filter(f => f.type.startsWith('image/'))
  if (images.length === 0) return
  e.preventDefault()
  for (const f of images) await addImageFile(f)
}

/** 发送可用:有文本或图片或已选技能(纯技能调用允许空文本) */
const canSend = computed(() => inputText.value.trim().length > 0 || pendingImages.value.length > 0 || !!pendingSkill.value)

// ── 技能 `/` 联想 ──
const skillOpen = ref(false)
const skillIndex = ref(0)
const pendingSkill = ref<SkillInfo | null>(null)
const skillQuery = computed(() => (inputText.value.startsWith('/') ? inputText.value.slice(1) : ''))
const filteredSkills = computed(() => {
  const q = skillQuery.value.trim().toLowerCase()
  const list = store.state.skills
  if (!q) return list
  return list.filter(
    (s) => s.name.toLowerCase().includes(q) || s.description.toLowerCase().includes(q),
  )
})

watch(inputText, (v) => {
  if (pendingSkill.value) {
    // 已选技能 chip 态不开任何联想浮层
    skillOpen.value = false
    mentionOpen.value = false
    mentionStart.value = -1
    return
  }
  // / 技能联想(仅当输入以 / 开头且光标在首字符区)
  skillOpen.value = v.startsWith('/')
  if (skillOpen.value) skillIndex.value = 0
  // UX-10: @ 实体引用(技能联想与 @ 联想互斥,二者同时仅一开)
  if (skillOpen.value) {
    mentionOpen.value = false
    mentionStart.value = -1
  } else {
    detectMentionTrigger()
  }
})

/**
 * UX-10: 检测光标前最近的 @ 触发符。
 * 规则:从光标位置向前找最近的 @,期间无空白/换行则激活(支持 "abc @dev" 但不支持 "a @b c @d" 中第二个被空格阻断)。
 * 找到 → mentionStart=该 @ 下标, mentionOpen=true; 否则关闭。
 */
function detectMentionTrigger() {
  const el = inputEl.value
  const text = inputText.value
  const cursor = el?.selectionStart ?? text.length
  // 从光标向前扫,遇空白/换行即停(说明 @ 与光标间有分隔,非同一 token)
  let i = cursor - 1
  while (i >= 0) {
    const ch = text[i]
    if (ch === '@') {
      // @ 必须在行首或前一字符为空白/换行/起始(避免邮箱 a@b 误触发)
      const prev = i > 0 ? text[i - 1] : ''
      if (prev === '' || /\s/.test(prev)) {
        mentionStart.value = i
        mentionOpen.value = true
        mentionIndex.value = 0
        return
      }
      // 形如 a@b:前字符非空白 → 不是 mention 触发符,继续向前扫也只会找到更早的 @,
      // 但中间已有非空白阻断,直接关闭
      break
    }
    if (/\s/.test(ch)) break
    i--
  }
  mentionOpen.value = false
  mentionStart.value = -1
}

function selectSkill(s: SkillInfo) {
  pendingSkill.value = s
  inputText.value = ''
  skillOpen.value = false
  mentionOpen.value = false
  mentionStart.value = -1
  nextTick(() => inputEl.value?.focus())
}

function clearSkill() {
  pendingSkill.value = null
  nextTick(() => inputEl.value?.focus())
}

// ── UX-10 §1.4: @ 实体引用(@ 触发 popover,选中插入 [类型:名] 标记,后端 system prompt 注入摘要) ──
// 架构复用 / 技能联想:独立状态(mentionOpen/mentionIndex/mentionQuery),不与 skill 混。
// 联想源只读 projectsStore.projects / projectsStore.tasks(前端 store 现有数据,不新增 IPC)。
// 触发:输入框光标前最近的 @ 后无空白/换行 → 激活;Esc/光标移开/选中插入 → 关闭。
// Enter 不冲突:popover 开时 Enter 插入选中(覆盖发送),关时 Enter 发送(原逻辑)。
interface MentionItem {
  type: 'project' | 'task'
  /** 扁平后唯一 key(用于 key/导航扁平索引定位) */
  uid: string
  /** 实体原始 id(供后端解析,目前仅插入 [类型:名] 文本,id 未透传) */
  id: string
  name: string
  desc: string
  typeLabel: string
}

const mentionOpen = ref(false)
const mentionIndex = ref(0)
// @ 触发符在 inputText 中的起始下标(用于选中后精确替换 @query 段)
const mentionStart = ref(-1)

const mentionGroupLabel = computed(() => ({
  project: t('aiChat.mentionGroupProject'),
  task: t('aiChat.mentionGroupTask'),
}))

/** 当前 @ 查询文本(@ 之后的串,不含 @) */
const mentionQuery = computed(() => {
  if (mentionStart.value < 0) return ''
  return inputText.value.slice(mentionStart.value + 1)
})

/** 联想候选(项目 + 任务,按查询过滤;各限 20 防列表膨胀) */
const mentionItems = computed<MentionItem[]>(() => {
  const q = mentionQuery.value.trim().toLowerCase()
  const projects = (projectsStore.projects || []) as ProjectRecord[]
  const tasks = (projectsStore.tasks || []) as TaskRecord[]
  const match = (s: string) => !q || s.toLowerCase().includes(q)
  const projectItems: MentionItem[] = projects
    .filter(p => match(p.name) || match(p.description || ''))
    .slice(0, 20)
    .map(p => ({
      type: 'project' as const,
      uid: 'p-' + p.id,
      id: p.id,
      name: p.name,
      desc: p.description || '',
      typeLabel: t('aiChat.mentionGroupProject'),
    }))
  const taskItems: MentionItem[] = tasks
    .filter(tk => match(tk.title) || match(tk.description || ''))
    .slice(0, 20)
    .map(tk => ({
      type: 'task' as const,
      uid: 't-' + tk.id,
      id: tk.id,
      name: tk.title,
      desc: tk.description || '',
      typeLabel: t('aiChat.mentionGroupTask'),
    }))
  return [...projectItems, ...taskItems]
})

/** 联想候选总数(未过滤,用于区分"无匹配" vs "空") */
const mentionTotal = computed(() =>
  ((projectsStore.projects || []) as ProjectRecord[]).length
  + ((projectsStore.tasks || []) as TaskRecord[]).length,
)

/** 按类型分组(模板按组渲染组标题) */
const mentionGroups = computed(() => [
  { key: 'project', label: mentionGroupLabel.value.project, items: mentionItems.value.filter(i => i.type === 'project') },
  { key: 'task', label: mentionGroupLabel.value.task, items: mentionItems.value.filter(i => i.type === 'task') },
])

/** 扁平下标(组内 item 在扁平列表中的位置,供键盘导航 ↑↓/高亮) */
function mentionFlatIndex(uid: string): number {
  return mentionItems.value.findIndex(i => i.uid === uid)
}

/** 选中实体 → 替换 @query 段为 [类型: 名] 标记 + 关闭浮层 */
function selectMention(item: MentionItem) {
  const before = inputText.value.slice(0, mentionStart.value)
  const cursorAfter = mentionStart.value + 1 + mentionQuery.value.length
  const after = inputText.value.slice(cursorAfter)
  const label = item.type === 'project'
    ? `[${t('aiChat.mentionGroupProject')}: ${item.name}]`
    : `[${t('aiChat.mentionGroupTask')}: ${item.name}]`
  inputText.value = before + label + ' ' + after
  mentionOpen.value = false
  mentionStart.value = -1
  mentionIndex.value = 0
  nextTick(() => {
    const el = inputEl.value
    if (el) {
      // 光标置插入标记末尾
      const pos = (before + label + ' ').length
      el.focus()
      el.setSelectionRange(pos, pos)
      el.style.height = 'auto'
      el.style.height = Math.min(el.scrollHeight, 120) + 'px'
    }
  })
}

function handleKeydown(e: KeyboardEvent) {
  // UX-09:编辑态 Escape 取消编辑(最高优先级)
  if (props.editingMsgId && e.key === 'Escape') {
    e.preventDefault()
    emit('cancel-edit')
    return
  }
  // Escape 关闭技能联想浮层（无论是否有匹配项）
  if (skillOpen.value && e.key === 'Escape') {
    e.preventDefault()
    skillOpen.value = false
    return
  }
  // 已选技能 chip 态下 Escape 取消选中(浮层已关闭,这里兜底 chip 可取消路径)
  if (pendingSkill.value && e.key === 'Escape') {
    e.preventDefault()
    pendingSkill.value = null
    return
  }
  // 技能联想浮层导航（仅有匹配项时拦截方向/回车）
  if (skillOpen.value && filteredSkills.value.length) {
    if (e.key === 'ArrowDown') {
      e.preventDefault()
      skillIndex.value = (skillIndex.value + 1) % filteredSkills.value.length
      return
    }
    if (e.key === 'ArrowUp') {
      e.preventDefault()
      skillIndex.value = (skillIndex.value - 1 + filteredSkills.value.length) % filteredSkills.value.length
      return
    }
    if ((e.key === 'Enter' || e.key === 'Tab') && !e.shiftKey) {
      e.preventDefault()
      selectSkill(filteredSkills.value[skillIndex.value])
      return
    }
    if (e.key === 'Escape') {
      e.preventDefault()
      skillOpen.value = false
      return
    }
  }
  // UX-10: @ 实体引用浮层导航(仅有匹配项时拦截方向/回车;与技能联想互斥)
  if (mentionOpen.value && mentionItems.value.length) {
    if (e.key === 'ArrowDown') {
      e.preventDefault()
      mentionIndex.value = (mentionIndex.value + 1) % mentionItems.value.length
      return
    }
    if (e.key === 'ArrowUp') {
      e.preventDefault()
      mentionIndex.value = (mentionIndex.value - 1 + mentionItems.value.length) % mentionItems.value.length
      return
    }
    if ((e.key === 'Enter' || e.key === 'Tab') && !e.shiftKey) {
      e.preventDefault()
      selectMention(mentionItems.value[mentionIndex.value])
      return
    }
    if (e.key === 'Escape') {
      e.preventDefault()
      mentionOpen.value = false
      mentionStart.value = -1
      return
    }
  }
  if (e.key === 'Enter' && !e.shiftKey) {
    e.preventDefault()
    handleSend()
  }
}

function autoResize() {
  const el = inputEl.value
  if (el) {
    el.style.height = 'auto'
    el.style.height = Math.min(el.scrollHeight, 120) + 'px'
  }
}

async function handleSend() {
  const text = inputText.value.trim()
  // UX-09 编辑态:走 editMessage(不 push 新 user,编辑末条 user 后重生成)
  if (props.editingMsgId) {
    if (!text) return
    inputText.value = ''
    if (inputEl.value) inputEl.value.style.height = 'auto'
    try {
      await store.editMessage(text)
      emit('cancel-edit')
    } catch (e) {
      console.error('[AI] 编辑失败:', e)
      // 失败回填输入框供重试,保持编辑态(editMessage 内已回滚占位)
      inputText.value = text
      const msg = e instanceof Error ? e.message : String(e)
      emit('error', { msg: t('aiChat.editMessageFailed', { msg }), type: 'error' })
    }
    await nextTick()
    emit('sent')
    return
  }
  const skill = pendingSkill.value
  // 无文本、无图片、未选技能时忽略；选了技能允许空文本（纯技能调用）
  if (!text && !skill && pendingImages.value.length === 0) return
  // F-260614-05 Phase 2b: 快照待发送图片,构造 ContentPart[]([Text?, Image...])。
  // 后端 ai_chat_send IPC 当前不接 parts(Phase 2c 接入);本轮 parts 仅写本地 push 的
  // user 消息渲染多模态图,后端请求仍走 content 文本路径。
  const snapshotImgs = pendingImages.value.slice()
  const parts: ContentPart[] | undefined = snapshotImgs.length > 0
    ? [
        // 文本片(非空时作首片,便于后端 2c 接入后 content 与 parts 文本一致;
        //  空文本则只发图片片)
        ...(text ? [{ type: 'text' as const, text }] : []),
        ...snapshotImgs.map(img => {
          // dataUrl 形如 data:image/png;base64,xxxx —— 拆出纯 base64 + media_type
          const m = /^data:([^;]+);base64,(.*)$/s.exec(img.dataUrl)
          const mediaType = m?.[1] || img.mediaType
          const base64 = m?.[2] || ''
          return {
            type: 'image' as const,
            url: null,
            base64,
            media_type: mediaType,
            alt: null,
          }
        }),
      ]
    : undefined
  // 生成中不再拦截：sendMessage 会把消息排入待发送队列，完成后自动续发
  // 先清输入（无论立即发还是入队）；队列满/IPC 失败时 catch 回填
  inputText.value = ''
  pendingSkill.value = null
  pendingImages.value = []
  skillOpen.value = false
  mentionOpen.value = false
  mentionStart.value = -1
  if (inputEl.value) inputEl.value.style.height = 'auto'
  // 同步清空输入框后立即发送：sendMessage 内部同步 push 用户消息，
  // 清空与 push 合并到同一渲染周期 flush，消除"输入框已空但消息未显示"的间隙
  try {
    await store.sendMessage(text, skill?.name, false, parts)
  } catch (e) {
    console.error('[AI] 发送失败:', e)
    inputText.value = text
    pendingSkill.value = skill
    // 发送失败:回填图片供重试(快照原样还原)
    if (parts) {
      pendingImages.value = snapshotImgs
    }
    // 用户可见提示(原仅 console.error,用户无感);Tauri IPC 错误是字符串非 Error 对象
    const msg = e instanceof Error ? e.message : String(e)
    emit('error', { msg: t('aiChat.toastSendFail', { msg }), type: 'error' })
  }
  await nextTick()
  emit('sent')
}

/** 点击示例问题卡片:填入输入框并发送(复用 handleSend 同款发送路径,错误回退一致) */
async function sendExamplePrompt(i18nKey: string) {
  inputText.value = t(i18nKey)
  await handleSend()
}

// ── 父调用 expose(父 startEdit/cancelEdit/beforeunload 调用) ──

/** UX-09 进入编辑态:回填末条 user 内容到输入框,聚焦,光标置末 */
function startEditFocus(msg: AiMessage): void {
  inputText.value = msg.content
  nextTick(() => {
    inputEl.value?.focus()
    const el = inputEl.value
    if (el) {
      const len = el.value.length
      el.setSelectionRange(len, len)
      el.style.height = 'auto'
      el.style.height = Math.min(el.scrollHeight, 120) + 'px'
    }
  })
}

/** UX-09 取消编辑态:清空输入框 + 重置高度(父置 editingMsgId=null 后调) */
function clearInput(): void {
  inputText.value = ''
  pendingSkill.value = null
  pendingImages.value = []
  skillOpen.value = false
  mentionOpen.value = false
  mentionStart.value = -1
  if (inputEl.value) inputEl.value.style.height = 'auto'
}

/** 聚焦输入框 */
function focus(): void {
  inputEl.value?.focus()
}

/**
 * UX-260617-16:未发送输入保护。检测 inputText/pendingImages/pendingSkill 任一非空,
 * 用于 beforeunload 拦截(分离窗口关闭/刷新)与未来 onBeforeUnmount 拦截(面板切换)。
 */
function hasUnsentInput(): boolean {
  return (
    inputText.value.trim().length > 0 ||
    pendingImages.value.length > 0 ||
    !!pendingSkill.value
  )
}

defineExpose({
  focus,
  startEditFocus,
  clearInput,
  hasUnsentInput,
  sendExamplePrompt,
})
</script>
