<template>
  <div class="chat-container">
    <div class="chat-header">
      <h2>蜀道安全管理AI智能助手</h2>
    </div>
    <div class="chat-messages" ref="messagesContainer">
      <div v-for="(msg, index) in messages" :key="index" :class="['message', msg.role]">
        <div class="avatar">{{ msg.role === 'user' ? '👤' : '🤖' }}</div>
        <div class="content">
          <div v-if="msg.role === 'ai'" v-html="renderMarkdown(msg.content)" class="markdown-content"></div>
          <div v-else>{{ msg.content }}</div>
          <div class="message-actions" v-if="msg.role === 'ai'">
            <button @click="copyMessage(msg.content)" class="action-btn">📋 复制</button>
          </div>
        </div>
      </div>
      <div v-if="isLoading" class="message ai">
        <div class="avatar">🤖</div>
        <div class="content">
          <div class="typing-indicator">思考中...</div>
        </div>
      </div>
    </div>
    <div class="chat-input-area">
      <div class="quick-questions" v-if="messages.length === 0">
        <div class="section-title">常见问题</div>
        <div class="question-list">
          <button 
            v-for="q in quickQuestions" 
            :key="q" 
            @click="sendQuickQuestion(q)"
            class="quick-btn"
          >{{ q }}</button>
        </div>
      </div>
      <div class="input-wrapper">
        <textarea
          v-model="inputMessage"
          @keydown.enter.exact.prevent="sendMessage"
          placeholder="请输入您的问题..."
          :disabled="isLoading"
          rows="1"
        ></textarea>
        <button 
          @click="sendMessage" 
          :disabled="!inputMessage.trim() || isLoading"
          class="send-btn"
        >发送</button>
      </div>
    </div>
  </div>
</template>

<script setup>
import { ref, nextTick, watch } from 'vue'
import { marked } from 'marked'
import { getMockResponse, getQuickQuestions } from '@/mock/chatMock'

const messages = ref([])
const inputMessage = ref('')
const isLoading = ref(false)
const messagesContainer = ref(null)
const quickQuestions = ref(getQuickQuestions())

const renderMarkdown = (content) => {
  return marked.parse(content)
}

const scrollToBottom = async () => {
  await nextTick()
  if (messagesContainer.value) {
    messagesContainer.value.scrollTop = messagesContainer.value.scrollHeight
  }
}

const sendMessage = async () => {
  const message = inputMessage.value.trim()
  if (!message || isLoading.value) return

  messages.value.push({ role: 'user', content: message })
  inputMessage.value = ''
  isLoading.value = true
  await scrollToBottom()

  // Mock AI response
  setTimeout(async () => {
    const response = getMockResponse(message)
    messages.value.push({ role: 'ai', content: response })
    isLoading.value = false
    await scrollToBottom()
  }, 1000)
}

const sendQuickQuestion = (question) => {
  inputMessage.value = question
  sendMessage()
}

const copyMessage = async (content) => {
  await navigator.clipboard.writeText(content)
}
</script>

<style scoped lang="scss">
.chat-container {
  display: flex;
  flex-direction: column;
  height: 100%;
  background: #f8f9fa;
}

.chat-header {
  padding: 20px 24px;
  background: #fff;
  border-bottom: 1px solid #e8e8e8;

  h2 {
    font-size: 18px;
    font-weight: 500;
    color: #333;
  }
}

.chat-messages {
  flex: 1;
  overflow-y: auto;
  padding: 24px;

  .message {
    display: flex;
    margin-bottom: 20px;
    gap: 12px;

    &.user {
      flex-direction: row-reverse;
    }

    .avatar {
      font-size: 32px;
      flex-shrink: 0;
    }

    .content {
      max-width: 70%;
      padding: 12px 16px;
      border-radius: 12px;
      background: #fff;
      box-shadow: 0 1px 2px rgba(0,0,0,0.05);

      .markdown-content {
        :deep(p) {
          margin-bottom: 8px;
        }
        :deep(p:last-child) {
          margin-bottom: 0;
        }
      }
    }

    &.ai .content {
      background: #fff;
    }

    &.user .content {
      background: #1890ff;
      color: #fff;
    }

    .message-actions {
      margin-top: 8px;
      padding-top: 8px;
      border-top: 1px solid #f0f0f0;

      .action-btn {
        background: none;
        border: none;
        color: #999;
        cursor: pointer;
        font-size: 12px;
        padding: 4px 8px;

        &:hover {
          color: #666;
        }
      }
    }
  }

  .typing-indicator {
    color: #999;
    font-style: italic;
  }
}

.chat-input-area {
  padding: 20px 24px;
  background: #fff;
  border-top: 1px solid #e8e8e8;
}

.quick-questions {
  margin-bottom: 16px;

  .section-title {
    font-size: 14px;
    color: #666;
    margin-bottom: 12px;
  }

  .question-list {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;

    .quick-btn {
      padding: 8px 16px;
      border: 1px solid #d9d9d9;
      border-radius: 20px;
      background: #fff;
      cursor: pointer;
      font-size: 13px;
      color: #666;
      transition: all 0.2s;

      &:hover {
        border-color: #1890ff;
        color: #1890ff;
      }
    }
  }
}

.input-wrapper {
  display: flex;
  gap: 12px;
  align-items: flex-end;

  textarea {
    flex: 1;
    padding: 12px 16px;
    border: 1px solid #d9d9d9;
    border-radius: 8px;
    resize: none;
    font-size: 14px;
    line-height: 1.5;
    outline: none;
    transition: border-color 0.2s;

    &:focus {
      border-color: #1890ff;
    }

    &:disabled {
      background: #f5f5f5;
    }
  }

  .send-btn {
    padding: 12px 24px;
    background: #1890ff;
    color: #fff;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    font-size: 14px;
    transition: background 0.2s;

    &:hover:not(:disabled) {
      background: #40a9ff;
    }

    &:disabled {
      background: #d9d9d9;
      cursor: not-allowed;
    }
  }
}
</style>
