<template>
  <div ref="aiChatRef" class="ai-chat" :class="type">
    <div
      v-show="showUserInputContent"
      :class="firsUserInput ? 'firstUserInput' : 'popperUserInput'"
    >
      <UserForm
        v-model:api_form_data="api_form_data"
        v-model:form_data="form_data"
        :application="applicationDetails"
        :type="type"
        :first="firsUserInput"
        @confirm="UserFormConfirm"
        @cancel="() => (showUserInput = false)"
        ref="userFormRef"
      ></UserForm>
    </div>
    <template v-if="!isUserInput || !firsUserInput || type === 'log'">
      <el-scrollbar ref="scrollDiv" @scroll="handleScrollTop">
        <div ref="dialogScrollbar" class="ai-chat__content p-24">
          <PrologueContent
            :type="type"
            :application="applicationDetails"
            :available="available"
            :send-message="sendMessage"
          ></PrologueContent>

          <template v-for="(item, index) in chatList" :key="index">
            <!-- 问题 -->
            <QuestionContent
              :type="type"
              :application="applicationDetails"
              :chat-record="item"
            ></QuestionContent>
            <!-- 回答 -->
            <AnswerContent
              :application="applicationDetails"
              :loading="loading"
              v-model:chat-record="chatList[index]"
              :type="type"
              :send-message="sendMessage"
              :chat-management="ChatManagement"
            ></AnswerContent>
          </template>
        </div>
      </el-scrollbar>

      <ChatInputOperate
        :app-id="appId"
        :application-details="applicationDetails"
        :is-mobile="isMobile"
        :type="type"
        :send-message="sendMessage"
        :open-chat-id="openChatId"
        :chat-management="ChatManagement"
        v-model:chat-id="chartOpenId"
        v-model:loading="loading"
        v-if="type !== 'log'"
      >
        <template #operateBefore>
          <div class="flex-between">
            <slot name="operateBefore">
              <span></span>
            </slot>
            <el-button
              v-if="isUserInput"
              class="user-input-button mb-8"
              type="primary"
              text
              @click="toggleUserInput"
            >
              <AppIcon iconName="app-user-input"></AppIcon>
            </el-button>
          </div>
        </template>
      </ChatInputOperate>

      <Control></Control>
    </template>
  </div>
</template>
<script setup lang="ts">
import { ref, nextTick, computed, watch, reactive, onMounted, onBeforeUnmount } from 'vue'
import { useRoute } from 'vue-router'
import applicationApi from '@/api/application'
import logApi from '@/api/log'
import { ChatManagement, type chatType } from '@/api/type/application'
import { randomId } from '@/utils/utils'
import useStore from '@/stores'
import { isWorkFlow } from '@/utils/application'
import { debounce, first } from 'lodash'
import AnswerContent from '@/components/ai-chat/component/answer-content/index.vue'
import QuestionContent from '@/components/ai-chat/component/question-content/index.vue'
import ChatInputOperate from '@/components/ai-chat/component/chat-input-operate/index.vue'
import PrologueContent from '@/components/ai-chat/component/prologue-content/index.vue'
import UserForm from '@/components/ai-chat/component/user-form/index.vue'
import Control from '@/components/ai-chat/component/control/index.vue'
import { t } from '@/locales'
defineOptions({ name: 'AiChat' })
const route = useRoute()
const {
  params: { accessToken, id },
  query: { mode }
} = route as any
const props = withDefaults(
  defineProps<{
    applicationDetails: any
    type?: 'log' | 'ai-chat' | 'debug-ai-chat'
    appId?: string
    record?: Array<chatType>
    available?: boolean
    chatId?: string
  }>(),
  {
    applicationDetails: () => ({}),
    available: true,
    type: 'ai-chat'
  }
)
const emit = defineEmits(['refresh', 'scroll'])
const { application, common } = useStore()
const isMobile = computed(() => {
  return common.isMobile() || mode === 'embed' || mode === 'mobile'
})
const aiChatRef = ref()
const scrollDiv = ref()
const dialogScrollbar = ref()
const loading = ref(false)
const inputValue = ref<string>('')
const chartOpenId = ref<string>('')
const chatList = ref<any[]>([])
const form_data = ref<any>({})
const api_form_data = ref<any>({})
const userFormRef = ref<InstanceType<typeof UserForm>>()
// 用户输入
const firsUserInput = ref(true)
const showUserInput = ref(false)

const isUserInput = computed(
  () =>
    props.applicationDetails.work_flow?.nodes?.filter((v: any) => v.id === 'base-node')[0]
      .properties.user_input_field_list.length > 0
)
const showUserInputContent = computed(() => {
  return ((isUserInput.value && firsUserInput.value) || showUserInput.value) && props.type !== 'log'
})
watch(
  () => props.chatId,
  (val) => {
    if (val && val !== 'new') {
      chartOpenId.value = val
      firsUserInput.value = false
    } else {
      chartOpenId.value = ''
      firsUserInput.value = true
    }
  },
  { deep: true }
)

watch(
  () => props.applicationDetails,
  () => {
    chartOpenId.value = ''
  },
  { deep: true }
)

watch(
  () => props.record,
  (value) => {
    chatList.value = value ? value : []
  },
  {
    immediate: true
  }
)

const toggleUserInput = () => {
  showUserInput.value = !showUserInput.value
}

function UserFormConfirm() {
  firsUserInput.value = false
  showUserInput.value = false
}

function sendMessage(val: string, other_params_data?: any, chat?: chatType) {
  if (!userFormRef.value?.checkInputParam()) {
    return
  }
  if (!loading.value && props.applicationDetails?.name) {
    handleDebounceClick(val, other_params_data, chat)
  }
}

const handleDebounceClick = debounce((val, other_params_data?: any, chat?: chatType) => {
  chatMessage(chat, val, false, other_params_data)
}, 200)

/**
 * 打开对话id
 */
const openChatId: () => Promise<string> = () => {
  const obj = props.applicationDetails
  if (props.appId) {
    return applicationApi
      .getChatOpen(props.appId)
      .then((res) => {
        chartOpenId.value = res.data
        return res.data
      })
      .catch((res) => {
        if (res.response.status === 403) {
          return application.asyncAppAuthentication(accessToken).then(() => {
            return openChatId()
          })
        }
        return Promise.reject(res)
      })
  } else {
    if (isWorkFlow(obj.type)) {
      const submitObj = {
        work_flow: obj.work_flow
      }
      return applicationApi.postWorkflowChatOpen(submitObj).then((res) => {
        chartOpenId.value = res.data
        return res.data
      })
    } else {
      return applicationApi.postChatOpen(obj).then((res) => {
        chartOpenId.value = res.data
        return res.data
      })
    }
  }
}
/**
 * 对话
 */
function getChartOpenId(chat?: any, problem?: string, re_chat?: boolean, other_params_data?: any) {
  return openChatId().then(() => {
    chatMessage(chat, problem, re_chat, other_params_data)
  })
}

/**
 * 获取一个递归函数,处理流式数据
 * @param chat    每一条对话记录
 * @param reader  流数据
 * @param stream  是否是流式数据
 */
const getWrite = (chat: any, reader: any, stream: boolean) => {
  let tempResult = ''
  /**
   *
   * @param done  是否结束
   * @param value 值
   */
  const write_stream = ({ done, value }: { done: boolean; value: any }) => {
    try {
      if (done) {
        ChatManagement.close(chat.id)
        return
      }
      const decoder = new TextDecoder('utf-8')
      let str = decoder.decode(value, { stream: true })
      // 这里解释一下 start 因为数据流返回流并不是按照后端chunk返回 我们希望得到的chunk是data:{xxx}\n\n 但是它获取到的可能是 data:{ -> xxx}\n\n 总而言之就是 fetch不能保证每个chunk都说以data:开始 \n\n结束
      tempResult += str
      const split = tempResult.match(/data:.*}\n\n/g)
      if (split) {
        str = split.join('')
        tempResult = tempResult.replace(str, '')
      } else {
        return reader.read().then(write_stream)
      }
      // 这里解释一下 end
      if (str && str.startsWith('data:')) {
        if (split) {
          for (const index in split) {
            const chunk = JSON?.parse(split[index].replace('data:', ''))
            chat.chat_id = chunk.chat_id
            chat.record_id = chunk.chat_record_id
            if (!chunk.is_end) {
              ChatManagement.appendChunk(chat.id, chunk)
            }
            if (chunk.is_end) {
              // 流处理成功 返回成功回调
              return Promise.resolve()
            }
          }
        }
      }
    } catch (e) {
      return Promise.reject(e)
    }
    return reader.read().then(write_stream)
  }
  /**
   * 处理 json 响应
   * @param param0
   */
  const write_json = ({ done, value }: { done: boolean; value: any }) => {
    if (done) {
      const result_block = JSON.parse(tempResult)
      if (result_block.code === 500) {
        return Promise.reject(result_block.message)
      } else {
        if (result_block.content) {
          ChatManagement.append(chat.id, result_block.content)
        }
      }
      ChatManagement.close(chat.id)
      return
    }
    if (value) {
      const decoder = new TextDecoder('utf-8')
      tempResult += decoder.decode(value)
    }
    return reader.read().then(write_json)
  }
  return stream ? write_stream : write_json
}
const errorWrite = (chat: any, message?: string) => {
  ChatManagement.addChatRecord(chat, 50, loading)
  ChatManagement.write(chat.id)
  ChatManagement.append(chat.id, message || t('chat.tip.error500Message'))
  ChatManagement.updateStatus(chat.id, 500)
  ChatManagement.close(chat.id)
}
// 保存上传文件列表

function chatMessage(chat?: any, problem?: string, re_chat?: boolean, other_params_data?: any) {
  loading.value = true
  if (!chat) {
    chat = reactive({
      id: randomId(),
      problem_text: problem ? problem : inputValue.value.trim(),
      answer_text: '',
      answer_text_list: [[]],
      buffer: [],
      reasoning_content: '',
      reasoning_content_buffer: [],
      write_ed: false,
      is_stop: false,
      record_id: '',
      chat_id: '',
      vote_status: '-1',
      status: undefined,
      upload_meta: {
        image_list:
          other_params_data && other_params_data.image_list ? other_params_data.image_list : [],
        document_list:
          other_params_data && other_params_data.document_list
            ? other_params_data.document_list
            : [],
        audio_list:
          other_params_data && other_params_data.audio_list ? other_params_data.audio_list : []
      }
    })
    chatList.value.push(chat)
    ChatManagement.addChatRecord(chat, 50, loading)
    ChatManagement.write(chat.id)
    inputValue.value = ''
    nextTick(() => {
      // 将滚动条滚动到最下面
      scrollDiv.value.setScrollTop(getMaxHeight())
    })
  }
  if (chat.run_time) {
    ChatManagement.addChatRecord(chat, 50, loading)
    ChatManagement.write(chat.id)
  }
  if (!chartOpenId.value) {
    getChartOpenId(chat, problem, re_chat, other_params_data).catch(() => {
      errorWrite(chat)
    })
  } else {
    const obj = {
      message: chat.problem_text,
      re_chat: re_chat || false,
      ...other_params_data,
      form_data: {
        ...form_data.value,
        ...api_form_data.value
      }
    }
    // 对话
    applicationApi
      .postChatMessage(chartOpenId.value, obj)
      .then((response) => {
        if (response.status === 401) {
          application
            .asyncAppAuthentication(accessToken)
            .then(() => {
              chatMessage(chat, problem)
            })
            .catch(() => {
              errorWrite(chat)
            })
        } else if (response.status === 460) {
          return Promise.reject(t('chat.tip.errorIdentifyMessage'))
        } else if (response.status === 461) {
          return Promise.reject(t('chat.tip.errorLimitMessage'))
        } else {
          nextTick(() => {
            // 将滚动条滚动到最下面
            scrollDiv.value.setScrollTop(getMaxHeight())
          })
          const reader = response.body.getReader()
          // 处理流数据
          const write = getWrite(
            chat,
            reader,
            response.headers.get('Content-Type') !== 'application/json'
          )
          return reader.read().then(write)
        }
      })
      .then(() => {
        if (props.chatId === 'new') {
          emit('refresh', chartOpenId.value)
        }
        return (id || props.applicationDetails?.show_source) && getSourceDetail(chat)
      })
      .finally(() => {
        ChatManagement.close(chat.id)
      })
      .catch((e: any) => {
        errorWrite(chat, e + '')
      })
  }
}

/**
 * 获取对话详情
 * @param row
 */
function getSourceDetail(row: any) {
  logApi.getRecordDetail(id || props.appId, row.chat_id, row.record_id, loading).then((res) => {
    const exclude_keys = ['answer_text', 'id', 'answer_text_list']
    Object.keys(res.data).forEach((key) => {
      if (!exclude_keys.includes(key)) {
        row[key] = res.data[key]
      }
    })
  })
  return true
}

/**
 * 滚动条距离最上面的高度
 */
const scrollTop = ref(0)

const scorll = ref(true)

const getMaxHeight = () => {
  return dialogScrollbar.value!.scrollHeight
}
/**
 * 滚动滚动条到最上面
 * @param $event
 */
const handleScrollTop = ($event: any) => {
  scrollTop.value = $event.scrollTop
  if (
    dialogScrollbar.value.scrollHeight - (scrollTop.value + scrollDiv.value.wrapRef.offsetHeight) <=
    40
  ) {
    scorll.value = true
  } else {
    scorll.value = false
  }
  emit('scroll', { ...$event, dialogScrollbar: dialogScrollbar.value, scrollDiv: scrollDiv.value })
}
/**
 * 处理跟随滚动条
 */
const handleScroll = () => {
  if (props.type !== 'log' && scrollDiv.value) {
    // 内部高度小于外部高度 就需要出滚动条
    if (scrollDiv.value.wrapRef.offsetHeight < dialogScrollbar.value.scrollHeight) {
      // 如果当前滚动条距离最下面的距离在 规定距离 滚动条就跟随
      if (scorll.value) {
        scrollDiv.value.setScrollTop(getMaxHeight())
      }
    }
  }
}

onMounted(() => {
  window.sendMessage = sendMessage
})

onBeforeUnmount(() => {
  window.sendMessage = null
})

function setScrollBottom() {
  // 将滚动条滚动到最下面
  scrollDiv.value.setScrollTop(getMaxHeight())
}

watch(
  chatList,
  () => {
    handleScroll()
  },
  { deep: true, immediate: true }
)

defineExpose({
  setScrollBottom
})
</script>
<style lang="scss" scoped>
@import './index.scss';
.firstUserInput {
  height: 100%;
  display: flex;
  justify-content: center;
  align-items: center;
}
.popperUserInput {
  position: absolute;
  z-index: 999;
  right: 50px;
  bottom: 80px;
  width: calc(100% - 50px);
  max-width: 400px;
}
</style>
