<!-- ChatComponent.vue -->
<template>
  <div class="chat"  ref="chatContainer">
    <div class="header">
      <div class="header__left">
        <div
          v-if="!state.isSidebarOpen"
          class="close nav-btn"
          @click="state.isSidebarOpen = true"
        >
          <MenuOutlined />
        </div>
        <a-tooltip :title="configStore.config?.model_name" placement="rightTop">
          <div class="newchat nav-btn" @click="$emit('newconv')">
            <PlusCircleOutlined /> <span class="text">新对话</span>
          </div>
        </a-tooltip>
      </div>
      <div class="header__right">
        <!-- <div class="nav-btn text metas">
          <CompassFilled v-if="meta.use_web" />
          <GoldenFilled v-if="meta.use_graph"/>
        </div> -->
        <a-dropdown v-if="meta.selectedKB !== null">
          <a class="ant-dropdown-link nav-btn" @click.prevent>
            <!-- <component :is="meta.selectedKB === null ? BookOutlined : BookFilled" /> -->
             <BookOutlined />
            <span class="text">{{ meta.selectedKB === null ? '不使用' : opts.databases[meta.selectedKB]?.name }}</span>
          </a>
          <template #overlay>
            <a-menu>
              <a-menu-item v-for="(db, index) in opts.databases" :key="index" @click="useDatabase(index)">
                <a href="javascript:;" >{{ db.name }}</a>
              </a-menu-item>
              <a-menu-item  @click="useDatabase(null)">
                <a href="javascript:;">不使用</a>
              </a-menu-item>
            </a-menu>
          </template>
        </a-dropdown>
        <div class="nav-btn text" @click="opts.showPanel = !opts.showPanel">
          <component :is="opts.showPanel ? FolderOpenOutlined : FolderOutlined" /> <span class="text">选项</span>
        </div>
        <div v-if="opts.showPanel" class="my-panal r0 top100 swing-in-top-fwd" ref="panel">
          <div class="flex-center" v-if="configStore.config.enable_knowledge_base">
            知识库
            <div @click.stop>
              <a-dropdown>
                <a class="ant-dropdown-link " @click.prevent>
                  <!-- <component :is="meta.selectedKB === null ? BookOutlined : BookFilled" />&nbsp; -->
                  <BookOutlined />&nbsp;
                  <span class="text">{{ meta.selectedKB === null ? '不使用' : opts.databases[meta.selectedKB]?.name }}</span>
                </a>
                <template #overlay>
                  <a-menu>
                    <a-menu-item v-for="(db, index) in opts.databases" :key="index" @click="useDatabase(index)">
                      <a href="javascript:;">{{ db.name }}</a>
                    </a-menu-item>
                    <a-menu-item  @click="useDatabase(null)">
                      <a href="javascript:;">不使用</a>
                    </a-menu-item>
                  </a-menu>
                </template>
              </a-dropdown>
            </div>
          </div>
          <div class="flex-center" @click="meta.use_graph = !meta.use_graph" v-if="configStore.config.enable_knowledge_base">
            图数据库 <div @click.stop><a-switch v-model:checked="meta.use_graph" /></div>
          </div>
          <div class="flex-center" @click="meta.use_web = !meta.use_web" v-if="configStore.config.enable_search_engine">
            搜索引擎（Bing） <div @click.stop><a-switch v-model:checked="meta.use_web" /></div>
          </div>
          <div class="flex-center" @click="meta.stream = !meta.stream">
            流式输出 <div @click.stop><a-switch v-model:checked="meta.stream" /></div>
          </div>
          <div class="flex-center" @click="meta.summary_title = !meta.summary_title">
            总结对话标题 <div @click.stop><a-switch v-model:checked="meta.summary_title" /></div>
          </div>
          <div class="flex-center" v-if="configStore.config.enable_knowledge_base">
            重写查询 <a-segmented v-model:value="meta.rewriteQuery" :options="['off', 'on', 'hyde']"/>
          </div>
          <div class="flex-center">
            最大历史轮数 <a-input-number id="inputNumber" v-model:value="meta.history_round" :min="1" :max="50" />
          </div>
        </div>
      </div>
    </div>
    <div v-if="conv.messages.length == 0" class="chat-examples">
      <h1>你好，我是语析，一个基于知识图谱的智能助手</h1>
      <div class="opts">
        <div
          class="opt__button"
          v-for="(exp, key) in examples"
          :key="key"
          @click="conv.inputText = exp"
        >
          {{ exp }}
        </div>
      </div>
    </div>
    <div class="chat-box">
      <div
        v-for="message in conv.messages"
        :key="message.id"
        class="message-box"
        :class="message.role"
      >
        <p v-if="message.role=='sent'" style="white-space: pre-line" class="message-text">{{ message.text }}</p>
        <div v-else-if="message.text.length == 0 && message.status=='querying'"  class="loading-dots">
          <div></div>
          <div></div>
          <div></div>
        </div>
        <div v-else-if="message.text.length == 0 || message.status == 'error'" class="err-msg">请求错误，请重试</div>
        <div v-else
          v-html="renderMarkdown(message)"
          class="message-md"
          @click="consoleMsg(message)"></div>
        <RefsComponent v-if="message.role=='received' && message.status=='finished'" :message="message" />
      </div>
    </div>
    <div class="bottom">
      <div class="input-box">
        <a-textarea
          class="user-input"
          v-model:value="conv.inputText"
          @keydown="handleKeyDown"
          placeholder="输入问题……"
          :auto-size="{ minRows: 1, maxRows: 10 }"
        />
        <a-button size="large" @click="sendMessage" :disabled="(!conv.inputText && !isStreaming)">
          <template #icon> <SendOutlined v-if="!isStreaming" /> <LoadingOutlined v-else/> </template>
        </a-button>
      </div>
      <p class="note">请注意辨别内容的可靠性 模型供应商：{{ configStore.config?.model_provider }}: {{ configStore.config?.model_name }}</p>
    </div>
  </div>
</template>

<script setup>
import { reactive, ref, onMounted, toRefs, nextTick, computed, watch } from 'vue'
import {
  SendOutlined,
  MenuOutlined,
  FormOutlined,
  LoadingOutlined,
  BookOutlined,
  BookFilled,
  CompassFilled,
  GoldenFilled,
  SettingOutlined,
  SettingFilled,
  PlusCircleOutlined,
  FolderOutlined,
  FolderOpenOutlined,
  GlobalOutlined,
  FileTextOutlined,
  RobotOutlined,
} from '@ant-design/icons-vue'
import { onClickOutside } from '@vueuse/core'
import { Marked } from 'marked';
import { markedHighlight } from 'marked-highlight';
import { useConfigStore } from '@/stores/config'
import { message } from 'ant-design-vue'
import RefsComponent from '@/components/RefsComponent.vue'
import hljs from 'highlight.js';
import 'highlight.js/styles/github.css';

const props = defineProps({
  conv: Object,
  state: Object
})

const emit = defineEmits(['rename-title', 'newconv']);
const configStore = useConfigStore()

const { conv, state } = toRefs(props)
const chatContainer = ref(null)
const isStreaming = ref(false)
const panel = ref(null)
const modelCard = ref(null)
const examples = ref([
  '写一个冒泡排序',
  '肉碱的分子量是多少？直接回答',
  '总结大蒜的功效是什么？',
  '今天天气怎么样？',
  '吃饭吃出苍蝇可以索赔吗？',
  '帮我写一个请假条',
])

const opts = reactive({
  showPanel: false,
  showModelCard: false,
  openDetail: false,
  databases: [],
})

const meta = reactive(JSON.parse(localStorage.getItem('meta')) || {
  use_graph: false,
  use_web: false,
  graph_name: "neo4j",
  rewriteQuery: "off",
  selectedKB: null,
  stream: true,
  summary_title: true,
  history_round: 5,
})

const marked = new Marked(
  {
    gfm: true,
    breaks: true,
    tables: true,
  },
  markedHighlight({
    langPrefix: 'hljs language-',
    highlight(code) {
      return hljs.highlightAuto(code).value;
    }
  })
);

const consoleMsg = (message) => console.log(message)
onClickOutside(panel, () => setTimeout(() => opts.showPanel = false, 30))
onClickOutside(modelCard, () => setTimeout(() => opts.showModelCard = false, 30))

const renderMarkdown = (message) => {
  if (message.status === 'loading') {
    return marked.parse(message.text + '🟢')
  } else {
    return marked.parse(message.text)
  }
}

const useDatabase = (index) => {
  const selected = opts.databases[index]
  console.log(selected)
  if (index != null && configStore.config.embed_model != selected.embed_model) {
    console.log(selected.embed_model, configStore.config.embed_model)
    message.error(`所选知识库的向量模型（${selected.embed_model}）与当前向量模型（${configStore.config.embed_model}) 不匹配，请重新选择`)
  } else {
    meta.selectedKB = index
  }
}

const handleKeyDown = (e) => {
  if (e.key === 'Enter' && !e.shiftKey) {
    e.preventDefault()
    sendMessage()
  } else if (e.key === 'Enter' && e.shiftKey) {
    // Insert a newline character at the current cursor position
    const textarea = e.target;
    const start = textarea.selectionStart;
    const end = textarea.selectionEnd;
    conv.value.inputText.value =
      conv.value.inputText.value.substring(0, start) +
      '\n' +
      conv.value.inputText.value.substring(end);
    nextTick(() => {
      textarea.setSelectionRange(start + 1, start + 1);
    });
  }
}

const renameTitle = () => {
  if (meta.summary_title) {
    const prompt = '请用一个很短的句子关于下面的对话内容的主题起一个名字，不要带标点符号：'
    const firstUserMessage = conv.value.messages[0].text
    const firstAiMessage = conv.value.messages[1].text
    const context = `${prompt}\n\n问题: ${firstUserMessage}\n\n回复: ${firstAiMessage}，主题是（一句话）：`
    simpleCall(context).then((data) => {
      const response = data.response.split("：")[0].replace(/^["'"']/g, '').replace(/["'"']$/g, '')
      emit('rename-title', response)
    })
  } else {
    emit('rename-title', conv.value.messages[0].text)
  }
}

const scrollToBottom = () => {
  setTimeout(() => {
    chatContainer.value.scrollTop = chatContainer.value.scrollHeight - chatContainer.value.clientHeight
  }, 10)
}


const generateRandomHash = (length) => {
    let chars = 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789';
    let hash = '';
    for (let i = 0; i < length; i++) {
        hash += chars.charAt(Math.floor(Math.random() * chars.length));
    }
    return hash;
}

const appendUserMessage = (message) => {
  conv.value.messages.push({
    id: generateRandomHash(16),
    role: 'sent',
    text: message
  })
  scrollToBottom()
}

const appendAiMessage = (message, refs=null) => {
  conv.value.messages.push({
    id: generateRandomHash(16),
    role: 'received',
    text: message,
    refs,
    status: "querying",
  })
  scrollToBottom()
}

const updateMessage = (text, id, refs, status) => {
  const message = conv.value.messages.find((message) => message.id === id);
  if (message) {
    message.refs = refs;
    message.status = status;
    message.text = text;
    message.model_name = refs.model_name
  } else {
    console.error('Message not found');
  }
  scrollToBottom();
};


const updateStatus = (id, status) => {
  const message = conv.value.messages.find((message) => message.id === id)
  if (message) {
    message.status = status
  } else {
    console.error('Message not found')
  }

  if (message.refs.knowledge_base.results.length > 0) {
    message.groupedResults = message.refs.knowledge_base.results.reduce((acc, result) => {
      const { filename } = result.file;
      console.log(acc, result, filename)
      if (!acc[filename]) {
        acc[filename] = []
      }
      acc[filename].push(result)
      return acc;
    }, {})
  }
  scrollToBottom()
}

const simpleCall = (message) => {
  return new Promise((resolve, reject) => {
    fetch('/api/chat/call', {
      method: 'POST',
      body: JSON.stringify({ query: message, }),
      headers: { 'Content-Type': 'application/json' }
    })
    .then((response) => response.json())
    .then((data) => resolve(data))
    .catch((error) => reject(error))
  })
}

const loadDatabases = () => {
  fetch('/api/data/', { method: "GET", })
    .then(response => response.json())
    .then(data => {
      console.log(data)
      opts.databases = data.databases
    })
}

// 新函数用于处理 fetch 请求
const fetchChatResponse = (user_input, cur_res_id) => {
  fetch('/api/chat', {
    method: 'POST',
    body: JSON.stringify({
      query: user_input,
      history: conv.value.history,
      meta: meta
    }),
    headers: {
      'Content-Type': 'application/json'
    }
  }).then((response) => {
    const reader = response.body.getReader();
    const decoder = new TextDecoder();
    let buffer = '';

    // 逐步读取响应文本
    const readChunk = () => {
      return reader.read().then(({ done, value }) => {
        if (done) {
          // 处理完成
          updateStatus(cur_res_id, "finished");
          isStreaming.value = false;
          if (conv.value.messages.length === 2) { renameTitle(); }
          return; // 结束读取
        }

        buffer += decoder.decode(value, { stream: true });
        const messages = buffer.trim().split('\n');

        messages.forEach((message) => {
          try {
            const data = JSON.parse(message);
            updateMessage(data.response, cur_res_id, data.refs, "loading");
            conv.value.history = data.history;
          } catch (e) {
            console.error('JSON 解析错误:', e);
          }
        });
        buffer = ''; // 清空缓冲区
        return readChunk(); // 继续读取
      });
    };
    return readChunk();
  })
  .catch((error) => {
    console.error(error);
    updateStatus(cur_res_id, "error");
    isStreaming.value = false;
  });
}

// 更新后的 sendMessage 函数
const sendMessage = () => {
  const user_input = conv.value.inputText.trim();
  const dbName = opts.databases.length > 0 ? opts.databases[meta.selectedKB]?.metaname : null;
  if (user_input) {
    isStreaming.value = true;
    appendUserMessage(user_input);
    appendAiMessage("", null);
    const cur_res_id = conv.value.messages[conv.value.messages.length - 1].id;
    conv.value.inputText = '';
    meta.db_name = dbName;

    fetchChatResponse(user_input, cur_res_id)
  } else {
    console.log('请输入消息');
  }
}

const autoSend = (message) => {
  conv.value.inputText = message
  sendMessage()
}

// 从本地存储加载数据
onMounted(() => {
  scrollToBottom()
  loadDatabases()
  const storedMeta = localStorage.getItem('meta');
  if (storedMeta) {
    const parsedMeta = JSON.parse(storedMeta);
    Object.assign(meta, parsedMeta);
  }
});

// 监听 meta 对象的变化，并保存到本地存储
watch(
  () => meta,
  (newMeta) => {
    localStorage.setItem('meta', JSON.stringify(newMeta));
  },
  { deep: true }
);
</script>

<style lang="less" scoped>
.chat {
  position: relative;
  width: 100%;
  max-height: 100vh;
  display: flex;
  flex-direction: column;
  overflow-x: hidden;
  background: white;
  position: relative;
  box-sizing: border-box;
  flex: 5 5 200px;
  overflow-y: scroll;

  .header {
    user-select: none;
    position: sticky;
    top: 0;
    z-index: 10;
    background-color: white;
    height: var(--header-height);
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem;

    .header__left, .header__right {
      display: flex;
      align-items: center;
    }
  }

  .nav-btn {
    height: 2.5rem;
    display: flex;
    justify-content: center;
    align-items: center;
    border-radius: 8px;
    color: var(--gray-900);
    cursor: pointer;
    font-size: 1rem;
    width: auto;
    padding: 0.5rem 1rem;

    .text {
      margin-left: 10px;
    }

    &:hover {
      background-color: var(--main-light-3);
    }
  }

}
.metas {
  display: flex;
  gap: 8px;
}

.my-panal {
  position: absolute;
  margin-top: 5px;
  background-color: white;
  border: 1px solid #ccc;
  box-shadow: 0px 0px 10px 1px rgba(0, 0, 0, 0.05);
  border-radius: 12px;
  padding: 12px;
  z-index: 11;
  width: 280px;

  .flex-center {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 10px;
    padding: 8px 16px;
    border-radius: 8px;
    cursor: pointer;
    transition: background-color 0.3s;

    &:hover {
      background-color: var(--main-light-3);
    }
  }
}

.my-panal.r0.top100 {
  top: 100%;
  right: 0;
}

.my-panal.l0.top100 {
  top: 100%;
  left: 0;
}

.chat-examples {
  padding: 0 50px;
  text-align: center;
  position: absolute;
  top: 20%;
  width: 100%;
  z-index: 9;

  h1 {
    margin-bottom: 20px;
    font-size: 24px;
    color: #333;
  }

  .opts {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 10px;

    .opt__button {
      background-color: var(--gray-200);
      color: #333;
      padding: .5rem 1.5rem;
      border-radius: 2rem;
      cursor: pointer;
      // border: 2px solid var(--main-light-4);
      transition: background-color 0.3s;
      // box-shadow: 0px 0px 10px 2px var(--main-light-4);


      &:hover {
        background-color: #f0f1f1;
        // box-shadow: 0px 0px 10px 1px rgba(0, 0, 0, 0.1);
      }
    }
  }

}

.chat-box {
  width: 100%;
  max-width: 900px;
  margin: 0 auto;
  flex-grow: 1;
  padding: 1rem 2rem;
  display: flex;
  flex-direction: column;

  .message-box {
    display: inline-block;
    border-radius: 1.5rem;
    margin: 0.8rem 0;
    padding: 0.625rem 1.25rem;
    user-select: text;
    word-break: break-word;
    font-size: 16px;
    font-variation-settings: 'wght' 400, 'opsz' 10.5;
    font-weight: 400;
    box-sizing: border-box;
    color: black;
    /* box-shadow: 0px 0.3px 0.9px rgba(0, 0, 0, 0.12), 0px 1.6px 3.6px rgba(0, 0, 0, 0.16); */
    /* animation: slideInUp 0.1s ease-in; */

    .err-msg {
      color: #FF6B6B;
      border: 1px solid #FF6B6B;
      padding: 0.2rem 1rem;
      border-radius: 8px;
      text-align: center;
      background: #FFF0F0;
    }
  }

  .message-box.sent {
    line-height: 24px;
    max-width: 95%;
    background: var(--main-light-4);
    align-self: flex-end;
  }

  .message-box.received {
    color: initial;
    width: fit-content;
    text-align: left;
    word-wrap: break-word;
    margin: 0;
    padding-bottom: 0;
    padding-top: 16px;
    padding-left: 0;
    padding-right: 0;
    text-align: justify;
  }

  p.message-text {
    max-width: 100%;
    word-wrap: break-word;
    margin-bottom: 0;
  }

  p.message-md {
    word-wrap: break-word;
    margin-bottom: 0;
  }
}

.bottom {
  position: sticky;
  bottom: 0;
  width: 100%;
  margin: 0 auto;
  padding: 4px 2rem 0 2rem;
  background: white;

  .input-box {
    display: flex;
    width: 100%;
    height: auto;
    max-width: 900px;
    margin: 0 auto;
    align-items: flex-end;
    padding: 0.25rem 0.5rem;
    // box-shadow: rgba(42, 60, 79, 0.1) 0px 6px 10px 0px;
    border: 2px solid #E5E5E5;
    border-radius: 1rem;
    background: #fcfdfd;
    transition: background 0.3s, box-shadow 0.3s;
    &:focus-within {
      border: 2px solid var(--main-500);
      background: white;
      // box-shadow: rgb(42 60 79 / 5%) 0px 4px 10px 0px;
    }

    textarea.user-input {
      flex: 1;
      height: 40px;
      padding: 0.5rem 0.5rem;
      background-color: transparent;
      border: none;
      font-size: 1.2rem;
      margin: 0 0.6rem;
      color: #111111;
      font-size: 16px;
      font-variation-settings: 'wght' 400, 'opsz' 10.5;
      outline: none;
      resize: none;
      &:focus {
        outline: none;
        box-shadow: none;
      }

      &:active {
        outline: none;
      }
    }
  }

  button.ant-btn-icon-only {
    font-size: 1.25rem;
    cursor: pointer;
    background-color: transparent;
    border: none;
    transition: color 0.3s;
    box-shadow: none;
    color: var(--main-700);;
    padding: 0;

    &:hover {
      color: var(--gray-1000);
    }

    &:disabled {
      color: #ccc;
      cursor: not-allowed;
    }
  }
  .note {
    width: 100%;
    font-size: small;
    text-align: center;
    padding: 0rem;
    color: #ccc;
    margin: 4px 0;
    user-select: none;
  }
}



.ant-dropdown-link {
  color: var(--gray-900);
  cursor: pointer;
}



.chat::-webkit-scrollbar {
  position: absolute;
  width: 4px;
}

.chat::-webkit-scrollbar-track {
  background: transparent;
  border-radius: 4px;
}

.chat::-webkit-scrollbar-thumb {
  background: var(--gray-400);
  border-radius: 4px;
}

.chat::-webkit-scrollbar-thumb:hover {
  background: rgb(100, 100, 100);
  border-radius: 4px;
}

.chat::-webkit-scrollbar-thumb:active {
  background: rgb(68, 68, 68);
  border-radius: 4px;
}

.loading-dots {
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

.loading-dots div {
  width: 8px;
  height: 8px;
  margin: 0 4px;
  background-color: #666;
  border-radius: 50%;
  opacity: 0.3;
  animation: pulse 1.4s infinite ease-in-out both;
}

.loading-dots div:nth-child(1) {
  animation-delay: -0.32s;
}

.loading-dots div:nth-child(2) {
  animation-delay: -0.16s;
}

@keyframes pulse {
  0%, 80%, 100% {
    transform: scale(0.6);
    opacity: 0.3;
  }
  40% {
    transform: scale(1);
    opacity: 1;
  }
}

@keyframes loading {0%,80%,100%{transform:scale(0.5);}40%{transform:scale(1);}}

.slide-out-left{-webkit-animation:slide-out-left .2s cubic-bezier(.55,.085,.68,.53) both;animation:slide-out-left .5s cubic-bezier(.55,.085,.68,.53) both}
.swing-in-top-fwd{-webkit-animation:swing-in-top-fwd .2s ease-out both;animation:swing-in-top-fwd .2s ease-out both}
@-webkit-keyframes swing-in-top-fwd{0%{-webkit-transform:rotateX(-100deg);transform:rotateX(-100deg);-webkit-transform-origin:top;transform-origin:top;opacity:0}100%{-webkit-transform:rotateX(0deg);transform:rotateX(0deg);-webkit-transform-origin:top;transform-origin:top;opacity:1}}@keyframes swing-in-top-fwd{0%{-webkit-transform:rotateX(-100deg);transform:rotateX(-100deg);-webkit-transform-origin:top;transform-origin:top;opacity:0}100%{-webkit-transform:rotateX(0deg);transform:rotateX(0deg);-webkit-transform-origin:top;transform-origin:top;opacity:1}}
@-webkit-keyframes slide-out-left{0%{-webkit-transform:translateX(0);transform:translateX(0);opacity:1}100%{-webkit-transform:translateX(-1000px);transform:translateX(-1000px);opacity:0}}@keyframes slide-out-left{0%{-webkit-transform:translateX(0);transform:translateX(0);opacity:1}100%{-webkit-transform:translateX(-1000px);transform:translateX(-1000px);opacity:0}}

@media (max-width: 520px) {
  .chat {
    height: calc(100vh - 60px);
  }

  .chat-container .chat .header {
    background: var(--main-light-4);
    .header__left, .header__right {
      gap: 20px;
    }

    .nav-btn {
      font-size: 1.5rem;
      padding: 0;

      &:hover {
        background-color: transparent;
        color: black;
      }

      .text {
        display: none;
      }
    }
  }

  .bottom {
    padding: 0.5rem 0.5rem;

    .input-box {
      border-radius: 8px;
      padding: 0.5rem;

      textarea.user-input {
        padding: 0.5rem 0;
      }
    }
    .note {
      display: none;
    }
  }
}
</style>

<style lang="less">
.message-box pre {
  border-radius: 8px;
  font-size: 14px;
  border: 1px solid var(--main-light-3);
  padding: 1rem;

  &:has(code.hljs) {
    padding: 0;
  }
}

.message-md {
  h1, h2, h3, h4, h5, h6 {
    font-size: 1rem;
  }
}
</style>