<template>
  <div class="chat-header">
    <div class="header-content">
      <div class="title">
        <el-button 
          class="desktop-sidebar-toggle" 
          :icon="Expand"
          @click="settingsStore.toggleSidebar"
          text
        />
        <span class="title-text">{{ title }}</span>
      
        <el-tag v-if="chatStore.currentConversation?.conversationStatus === 'typing'" 
          size="small" 
          class="status-tag"
          type="warning"
        >
          对话中
        </el-tag>
      </div>
      <div class="actions">
        <HistoryButton :icon-only="false" class="title-history-btn" />
        <el-tooltip content="删除会话" placement="bottom" v-if="chatStore.conversationId">
          <el-button 
            class="action-btn delete-btn" 
            :icon="Delete"
            @click="handleDelete"
            text
          >
          </el-button>
        </el-tooltip>
        <!-- <el-tooltip content="设置" placement="bottom">
          <el-button 
            class="action-btn" 
            :icon="Setting"
            @click="handleSettings"
            text
          >
          </el-button>
        </el-tooltip> -->
        <el-tooltip :content="hasBackground ? '客户背景' : '暂无客户背景信息'" placement="bottom" v-if="hasBackground">
          <el-button 
            class="action-btn" 
            :icon="User"
            @click="showUserInfo = true"
            text
          >
          </el-button>
        </el-tooltip>
      </div>
    </div>

    <CustomerBackground v-model="showUserInfo" ref="customerBackgroundRef" />
  </div>
</template>

<script setup>
import { ref, computed, onMounted, onUnmounted } from 'vue'
import { useChatStore } from '@/store/chat'
import { useSettingsStore } from '@/store/settings'
import { Delete, Setting, User, Expand } from '@element-plus/icons-vue'
import { ElMessageBox } from 'element-plus'
import HistoryButton from '@/components/chat/HistoryButton.vue'
import CustomerBackground from '@/components/chat/CustomerBackground.vue'

const chatStore = useChatStore()
const settingsStore = useSettingsStore()
const showUserInfo = ref(false)
const customerBackgroundRef = ref(null)
const isMobile = ref(false)

const title = computed(() => {
  const conversation = chatStore.currentConversation
  if (!conversation) return '新会话'
  // 使用第一条消息作为标题
  if (conversation.chatMessages && conversation.chatMessages.length > 0) {
    return conversation.chatMessages[0].question
  }
  return '新会话'
})

const hasBackground = computed(() => {
  return customerBackgroundRef.value?.hasBackground ?? false
})

const handleDelete = async () => {
  console.log(chatStore.conversationId)
  if (!chatStore.conversationId) return
  
  try {
    await ElMessageBox.confirm(
      '确定要删除当前会话吗？删除后无法恢复。',
      '删除确认',
      {
        confirmButtonText: '确定',
        cancelButtonText: '取消',
        type: 'warning',
        confirmButtonClass: 'el-button--danger'
      }
    )
    chatStore.deleteConversation(chatStore.conversationId)
  } catch {
    // 用户取消操作
  }
}

const handleSettings = () => {
  // TODO: 实现设置功能
  console.log('打开设置')
}

const checkMobile = () => {
  isMobile.value = window.innerWidth <= 768
}

onMounted(() => {
  checkMobile()
  window.addEventListener('resize', checkMobile)
})

onUnmounted(() => {
  window.removeEventListener('resize', checkMobile)
})
</script>

<style lang="scss" scoped>
.chat-header {
  height: 60px;
  border-bottom: 1px solid var(--el-border-color-light);
  background: var(--el-color-primary-light-8);
  padding: 0 20px;
  flex-shrink: 0;
  
  .header-content {
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
  }

  .title {
    display: flex;
    align-items: center;
    gap: 4px;
    height: 100%;
    
    .mobile-sidebar-toggle {
      height: 24px;
      width: 24px;
      padding: 0;
      color: var(--el-text-color-secondary);
      transition: all 0.3s ease;
      border: none;
      background: transparent !important;
      font-size: 14px;
      display: flex;
      align-items: center;
      justify-content: center;
      margin-left: -4px;
      
      &:hover {
        color: var(--el-color-primary);
        background: transparent !important;
      }

      &:focus {
        outline: none;
        box-shadow: none;
      }

      :deep(.el-icon) {
        font-size: 18px;
        margin-top: 1px;
      }
    }
    
    .title-text {
      font-size: 16px;
      font-weight: 500;
      color: var(--el-text-color-primary);
      max-width: 500px;
      white-space: nowrap;
      overflow: hidden;
      text-overflow: ellipsis;
      line-height: 24px;
      padding-top: 1px;
    }

    .desktop-sidebar-toggle {
      height: 24px;
      width: 24px;
      padding: 0;
      color: var(--el-text-color-secondary);
      transition: all 0.3s ease;
      border: none;
      background: transparent !important;
      font-size: 14px;
      display: flex;
      align-items: center;
      justify-content: center;
      &:hover {
        color: var(--el-color-primary);
        background: transparent !important;
      }

      &:focus {
        outline: none;
        box-shadow: none;
      }

      :deep(.el-icon) {
        font-size: 18px;
        margin-top: 1px;
      }
    }

    .status-tag {
      font-weight: normal;
      flex-shrink: 0;
    }

    .title-history-btn {
      :deep(.history-btn) {
        height: 32px;
        padding: 0 12px;
        color: var(--el-text-color-secondary);
        transition: all 0.3s ease;
        font-size: 14px;
        
        &:hover {
          color: var(--el-color-primary);
          background-color: var(--el-color-primary-light-9);
        }

        :deep(.el-icon) {
          font-size: 16px;
          margin-right: 4px;
        }
      }
    }
  }

  .actions {
    display: flex;
    align-items: center;
    gap: 4px;

    .action-btn {
      height: 32px;
      width: 32px;
      padding: 0;
      color: var(--el-text-color-secondary);
      transition: all 0.3s ease;
      border: none;
      background: transparent !important;
      font-size: 14px;
      
      &:hover {
        color: var(--el-color-primary);
        background: transparent !important;
      }

      &.delete-btn {
        &:hover {
          color: var(--el-color-danger) !important;
          background-color: var(--el-color-danger-light-9) !important;
        }
      }

      &:focus {
        outline: none;
        box-shadow: none;
      }

      :deep(.el-icon) {
        font-size: 16px;
      }
    }
  }
}

// Dark mode override
html.dark .chat-header {
  background: var(--el-color-primary-dark-1);
  border-bottom-color: var(--el-border-color-dark);
}

.user-info-content {
  padding: 20px;

  .info-section {
    margin-bottom: 24px;

    &:last-child {
      margin-bottom: 0;
    }

    h3 {
      font-size: 16px;
      font-weight: 500;
      color: #333;
      margin: 0 0 12px 0;
      padding-bottom: 8px;
      border-bottom: 1px solid #eee;
    }

    .info-item {
      display: flex;
      margin-bottom: 8px;
      line-height: 1.6;

      &:last-child {
        margin-bottom: 0;
      }

      &.description {
        flex-direction: column;
        gap: 8px;
      }

      .label {
        color: #666;
        min-width: 80px;
        flex-shrink: 0;
      }

      .value {
        color: #333;
        flex: 1;
      }
    }
  }
}

.dialog-footer {
  padding-top: 20px;
}
</style> 