<!-- =============================================================================
// 企微IT智能服务台 — 坐席端消息气泡组件
// =============================================================================
// 说明：单条消息的气泡展示
// 功能：
//    - 长按/右键弹出操作菜单：复制、撤回（2分钟内）、删除
//    - 消息状态显示：发送中、已发送、已送达、已读
//    - 时间戳显示规则：同日期只显示时间，不同日期显示月日时间
//    - 消息类型：文本、图片、文件、语音、系统消息
// ============================================================================= -->

<template>
  <!-- 系统消息：居中灰色文字 -->
  <div v-if="message.sender_type === 'system'" class="message-item message-item--system">
    <span class="message-item__system-text">{{ message.content }}</span>
  </div>

  <!-- 非系统消息 -->
  <div
    v-else
    class="message-row"
    :class="`message-row-${message.sender_type}`"
    @contextmenu.prevent="showContextMenu"
  >
    <!-- 发送者名称 -->
    <div v-if="message.sender_type !== 'agent'" class="message-sender-name">
      {{ senderLabel }}
      <span v-if="message.sender_type === 'ai'" class="ai-tag">AI</span>
    </div>

    <!-- 消息气泡 -->
    <div class="message-bubble" :class="`message-${message.sender_type}`">
      <!-- 引用回复摘要 -->
      <div v-if="message.reply_to_id && replyToContent" class="reply-quote" @click.stop="$emit('scrollToMessage', message.reply_to_id)">
        <div class="reply-quote-bar"></div>
        <div class="reply-quote-text">
          <span class="reply-quote-sender">{{ replyToSender }}</span>
          {{ replyToContent }}
        </div>
      </div>

      <!-- 文本消息 -->
      <template v-if="message.msg_type === 'text'">
        <div style="white-space: pre-wrap;">{{ message.content }}</div>
      </template>

      <!-- 图片消息 -->
      <template v-else-if="message.msg_type === 'image'">
        <div class="image-message" @click="previewImage">
          <img
            v-if="message.media_url || message.extra_data?.pic_url"
            :src="message.media_url || message.extra_data?.pic_url"
            :alt="message.file_name || '图片'"
            class="image-thumbnail"
            loading="lazy"
          />
          <div v-else class="media-card">
            <div class="media-icon">🖼️</div>
            <div class="media-info">
              <span class="media-type-label">图片消息</span>
              <span v-if="message.file_name" class="media-filename">{{ message.file_name }}</span>
            </div>
          </div>
        </div>
      </template>

      <!-- 文件消息 -->
      <template v-else-if="message.msg_type === 'file'">
        <a
          v-if="message.media_url"
          :href="message.media_url"
          target="_blank"
          class="media-card media-card-link"
        >
          <div class="media-icon">📎</div>
          <div class="media-info">
            <span class="media-type-label">{{ message.file_name || '文件消息' }}</span>
            <span v-if="message.file_size" class="media-size">{{ formatFileSize(message.file_size) }}</span>
          </div>
        </a>
        <div v-else class="media-card">
          <div class="media-icon">📎</div>
          <div class="media-info">
            <span class="media-type-label">{{ message.file_name || '文件消息' }}</span>
            <span v-if="message.file_size" class="media-size">{{ formatFileSize(message.file_size) }}</span>
          </div>
        </div>
      </template>

      <!-- 其他消息 -->
      <template v-else>
        <div class="media-card">
          <div class="media-icon">{{ mediaIcon }}</div>
          <div class="media-info">
            <span class="media-type-label">{{ mediaTypeLabel }}</span>
            <span v-if="message.file_name" class="media-filename">{{ message.file_name }}</span>
            <span v-if="message.file_size" class="media-size">{{ formatFileSize(message.file_size) }}</span>
          </div>
        </div>
      </template>

      <!-- 操作按钮（hover 显示） -->
      <div v-if="showActions" class="bubble-actions">
        <button
          v-if="message.msg_type === 'text'"
          class="action-btn"
          title="复制消息"
          @click.stop="copyMessage"
        >
          {{ copySuccess ? '✓' : '📋' }}
        </button>
        <button
          class="action-btn"
          title="回复"
          @click.stop="$emit('reply', message)"
        >
          ↩
        </button>
      </div>

      <!-- 消息状态 -->
      <div v-if="showStatus" class="message-status">
        {{ statusText }}
      </div>
    </div>

    <!-- 时间戳 -->
    <div class="message-time">{{ formatMessageTime }}</div>

    <!-- 操作菜单 -->
    <div v-if="contextMenuVisible" class="context-menu" :style="contextMenuStyle">
      <button class="context-menu__item" @click.stop="copyMessage">
        📋 复制
      </button>
      <button
        v-if="canRecall"
        class="context-menu__item"
        @click.stop="recallMessage"
      >
        ↩️ 撤回
      </button>
      <button
        v-if="message.sender_type === 'employee'"
        class="context-menu__item context-menu__item--danger"
        @click.stop="deleteMessage"
      >
        🗑️ 删除
      </button>
    </div>

    <div v-if="contextMenuVisible" class="context-menu__overlay" @click="closeContextMenu"></div>
  </div>
</template>

<script setup lang="ts">
/**
 * MessageItem 消息气泡组件
 * 长按/右键弹出操作菜单
 * 消息状态显示
 * 时间戳显示规则
 */
import { computed, ref } from 'vue'
import { useClipboard } from '@vueuse/core'
import { ElMessage } from 'element-plus'
import type { Message } from '@/api/message'
import { useConversationStore } from '@/stores/conversation'

const props = defineProps<{
  message: Message
}>()

const emit = defineEmits<{
  (e: 'scrollToMessage', messageId: string): void
  (e: 'reply', message: Message): void
  (e: 'recall', messageId: string): void
  (e: 'delete', messageId: string): void
}>()

const conversationStore = useConversationStore()
const { copy } = useClipboard()

/** 是否显示操作按钮 */
const showActions = ref(false)

/** 操作菜单位置 */
const contextMenuVisible = ref(false)
const contextMenuStyle = ref<Record<string, string>>({})

/** 复制成功反馈 */
const copySuccess = ref(false)

// ============================================================================
// 计算属性
// ============================================================================

/** 发送者标签 */
const senderLabel = computed(() => {
  const labelMap: Record<string, string> = {
    employee: props.message.sender_name || '员工',
    agent: props.message.sender_name || '我',
    ai: 'AI助手',
  }
  return labelMap[props.message.sender_type] || '未知'
})

/** 格式化时间 */
const formatMessageTime = computed(() => {
  if (!props.message.created_at) return ''
  const date = new Date(props.message.created_at)
  const now = new Date()
  const isSameDay = date.toDateString() === now.toDateString()

  const hours = String(date.getHours()).padStart(2, '0')
  const minutes = String(date.getMinutes()).padStart(2, '0')

  if (isSameDay) {
    return `${hours}:${minutes}`
  } else {
    const month = String(date.getMonth() + 1).padStart(2, '0')
    const day = String(date.getDate()).padStart(2, '0')
    return `${month}-${day} ${hours}:${minutes}`
  }
})

/** 是否显示状态 */
const showStatus = computed(() => {
  return props.message.sender_type === 'agent' && props.message.status
})

/** 状态文本 */
const statusText = computed(() => {
  const statusMap: Record<string, string> = {
    sending: '发送中',
    sent: '已发送',
    delivered: '已送达',
    read: '已读',
  }
  return statusMap[props.message.status || ''] || ''
})

/** 是否可以撤回 */
const canRecall = computed(() => {
  if (props.message.sender_type !== 'agent') return false
  if (!props.message.created_at) return false
  const createdAt = new Date(props.message.created_at)
  const now = new Date()
  const diffMs = now.getTime() - createdAt.getTime()
  const diffMinutes = diffMs / (1000 * 60)
  return diffMinutes <= 2
})

/** 媒体图标 */
const mediaIcon = computed(() => {
  const icons: Record<string, string> = {
    image: '🖼️',
    voice: '🎤',
    video: '🎬',
    file: '📎',
    location: '📍',
  }
  return icons[props.message.msg_type] || '📄'
})

/** 媒体类型标签 */
const mediaTypeLabel = computed(() => {
  const labels: Record<string, string> = {
    image: '图片消息',
    voice: '语音消息',
    video: '视频消息',
    file: '文件消息',
    location: '位置消息',
  }
  return labels[props.message.msg_type] || '媒体消息'
})

/** 引用回复内容 */
const replyToContent = computed(() => {
  if (!props.message.reply_to_id) return ''
  const repliedMsg = conversationStore.messages.find(
    (m: Message) => m.id === props.message.reply_to_id
  )
  if (!repliedMsg) return '...'
  const text = repliedMsg.content || ''
  return text.length > 50 ? text.substring(0, 50) + '...' : text
})

/** 引用回复发送者 */
const replyToSender = computed(() => {
  if (!props.message.reply_to_id) return ''
  const repliedMsg = conversationStore.messages.find(
    (m: Message) => m.id === props.message.reply_to_id
  )
  if (!repliedMsg) return ''
  return repliedMsg.sender_name || '未知'
})

// ============================================================================
// 操作菜单
// ============================================================================
function showContextMenu(event: MouseEvent): void {
  contextMenuStyle.value = {
    left: `${event.clientX}px`,
    top: `${event.clientY}px`,
  }
  contextMenuVisible.value = true
}

function closeContextMenu(): void {
  contextMenuVisible.value = false
}

// ============================================================================
// 消息操作
// ============================================================================
async function copyMessage(): Promise<void> {
  try {
    await copy(props.message.content)
    copySuccess.value = true
    ElMessage.success('已复制')
    closeContextMenu()
    setTimeout(() => {
      copySuccess.value = false
    }, 1500)
  } catch (err) {
    console.error('复制失败:', err)
  }
}

function recallMessage(): void {
  emit('recall', props.message.id)
  closeContextMenu()
}

function deleteMessage(): void {
  emit('delete', props.message.id)
  closeContextMenu()
}

// ============================================================================
// 工具方法
// ============================================================================
function formatFileSize(bytes: number): string {
  if (bytes < 1024) return `${bytes} B`
  if (bytes < 1024 * 1024) return `${(bytes / 1024).toFixed(1)} KB`
  return `${(bytes / (1024 * 1024)).toFixed(1)} MB`
}

function previewImage(): void {
  const url = props.message.media_url || props.message.extra_data?.pic_url
  if (url) {
    window.open(url, '_blank')
  }
}
</script>

<style scoped>
/* ============================================================================
// 消息行
// ============================================================================ */
.message-row {
  display: flex;
  flex-direction: column;
  padding: 4px 16px;
  max-width: 100%;
  position: relative;
}

.message-row-employee {
  align-items: flex-start;
}

.message-row-agent {
  align-items: flex-end;
}

.message-row-ai {
  align-items: flex-start;
}

/* 系统消息 */
.message-item--system {
  align-items: center;
  padding: 8px 16px;
}

.message-item__system-text {
  font-size: 12px;
  color: var(--color-system-text);
  background-color: var(--color-system-bg);
  padding: 4px 12px;
  border-radius: 10px;
  max-width: 80%;
  text-align: center;
  line-height: 1.5;
}

/* 发送者名称 */
.message-sender-name {
  display: flex;
  align-items: center;
  gap: 4px;
  font-size: 12px;
  color: var(--text-tertiary);
  margin-bottom: 3px;
}

.ai-tag {
  display: inline-block;
  font-size: 10px;
  color: var(--color-ai-tag-text);
  background-color: var(--color-ai-tag-bg);
  padding: 1px 6px;
  border-radius: 3px;
  font-weight: 500;
}

/* 消息气泡 */
.message-bubble {
  max-width: 75%;
  padding: 10px 14px;
  border-radius: 12px;
  word-break: break-word;
  line-height: 1.5;
  position: relative;
}

.message-employee {
  background-color: var(--color-agent-bg);
  border: 1px solid var(--color-agent-border);
}

.message-agent {
  background-color: var(--color-employee-bg);
  border-top-right-radius: 4px;
}

.message-ai {
  background-color: var(--color-ai-bg);
  border-top-left-radius: 4px;
}

/* 消息时间 */
.message-time {
  font-size: 10px;
  color: var(--text-placeholder);
  margin-top: 3px;
}

/* 引用回复 */
.reply-quote {
  display: flex;
  align-items: stretch;
  gap: 6px;
  padding: 6px 8px;
  margin-bottom: 6px;
  background: var(--bg-tertiary);
  border-radius: 4px;
  cursor: pointer;
}

.reply-quote:hover {
  background: var(--accent-soft);
}

.reply-quote-bar {
  width: 3px;
  border-radius: 2px;
  background: var(--accent);
  flex-shrink: 0;
}

.reply-quote-text {
  font-size: 12px;
  color: var(--text-tertiary);
  line-height: 1.4;
}

.reply-quote-sender {
  color: var(--accent);
  font-weight: 500;
  margin-right: 4px;
}

/* 图片消息 */
.image-message {
  cursor: pointer;
  border-radius: 8px;
  overflow: hidden;
  max-width: 280px;
}

.image-thumbnail {
  display: block;
  max-width: 280px;
  max-height: 200px;
  object-fit: contain;
  border-radius: 6px;
}

/* 媒体卡片 */
.media-card {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 14px;
  background: var(--bg-tertiary);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  min-width: 180px;
  max-width: 260px;
}

.media-icon {
  font-size: 24px;
  line-height: 1;
  flex-shrink: 0;
}

.media-info {
  display: flex;
  flex-direction: column;
  gap: 2px;
  min-width: 0;
}

.media-type-label {
  font-size: 14px;
  color: var(--text-primary);
  font-weight: 500;
}

.media-filename {
  font-size: 12px;
  color: var(--text-tertiary);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.media-size {
  font-size: 11px;
  color: var(--text-placeholder);
}

.media-card-link {
  text-decoration: none;
  color: inherit;
}

.media-card-link:hover {
  background: var(--accent-soft);
  border-color: var(--accent);
}

/* 操作按钮 */
.bubble-actions {
  position: absolute;
  top: 4px;
  right: 4px;
  display: flex;
  gap: 2px;
  z-index: 2;
}

.action-btn {
  width: 24px;
  height: 24px;
  border: none;
  background: var(--bg-tertiary);
  border-radius: 4px;
  cursor: pointer;
  font-size: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0.7;
  transition: opacity 0.2s, background 0.2s;
  padding: 0;
}

.action-btn:hover {
  opacity: 1;
  background: var(--accent-soft);
}

/* 消息状态 */
.message-status {
  position: absolute;
  bottom: 4px;
  right: 8px;
  font-size: 10px;
  color: var(--text-placeholder);
}

/* 操作菜单 */
.context-menu {
  position: fixed;
  z-index: 1000;
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 4px;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
}

.context-menu__item {
  display: block;
  width: 100%;
  padding: 8px 16px;
  border: none;
  background: transparent;
  text-align: left;
  font-size: 14px;
  color: var(--text-primary);
  cursor: pointer;
  border-radius: 4px;
}

.context-menu__item:hover {
  background: var(--bg-tertiary);
}

.context-menu__item--danger {
  color: #ee0a24;
}

.context-menu__overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 999;
}
</style>