<template>
  <Sidebar :visible="sidebarTraces" :closeIcon="'pi pi-chevron-left'" :modal="false" position="left" :dismissable="false" class="!w-11/12" @show="show()">
    <template #header>
      <p class="h1">Traces</p>
    </template>
    <div class="pt-4 h-full flex items-center justify-start">
      <!-- Trace List -->
      <section class="w-80 h-full pr-4 border-r border-neutral-300">
        <p class="h2 px-2 mb-2">Trace List ({{ traceTotal }})</p>
        <p class="text-primary h2 px-2 mb-2">
          Click trace number to see more.
        </p>
        <div class="overflow-y-scroll overflow-x-hidden scrollbar mx-[-8px] max-h-[calc(100%_-_96px)]" >
          <table class="border-separate border-spacing-x-2 text-sm">
            <caption class="hidden">Trace List</caption>
            <thead class="sticky top-0 z-10 bg-neutral-10">
              <tr>
                <th class="h2 px-2 border-b border-neutral-500">Trace</th>
                <th class="h2 px-2 border-b border-neutral-500 text-start" colspan="3">Occurrences</th>
              </tr>
            </thead>
            <tbody>
              <tr v-for="(trace, key) in traceList" :key="key" class=" cursor-pointer hover:text-primary" @click="switchCaseData(trace.id, trace.base_count)">
                <td class="p-2">#{{ trace.id }}</td>
                <td class="p-2 w-24">
                  <div class="h-4 w-full bg-neutral-300 rounded-sm overflow-hidden">
                    <div class="h-full bg-primary" :style="trace.value"></div>
                  </div>
                </td>
                <td class="py-2 text-right">{{ trace.count }}</td>
                <td class="p-2 text-right">{{ trace.ratio }}</td>
              </tr>
            </tbody>
          </table>
        </div>
      </section>
      <!-- Trace item Table -->
      <section class="pl-4 h-full w-[calc(100%_-_320px)]">
        <p class="h2 mb-2">Trace #{{ showTraceId }}</p>
        <div class="h-36 w-full px-2 mb-2 border border-neutral-300 rounded">
          <div class="h-full w-full">
            <div id="cyTrace" ref="cyTraceRef" class="h-full min-w-full relative"></div>
          </div>
        </div>
        <div class="overflow-y-auto overflow-x-auto scrollbar w-full h-[calc(100%_-_200px)] infiniteTable " @scroll="handleScroll">
          <DataTable :value="caseData" showGridlines tableClass="text-sm" breakpoint="0">
            <div v-for="(col, index) in columnData" :key="index">
              <Column :field="col.field" :header="col.header">
                <template #body="{ data }">
                  <div :class="data[col.field]?.length > 18 ? 'whitespace-normal' : 'whitespace-nowrap'">
                     {{ data[col.field] }}
                  </div>
                </template>
              </Column>
            </div>
          </DataTable>
        </div>
      </section>
    </div>
  </Sidebar>
</template>
<script setup>
// The Lucia project.
// Copyright 2023-2026 DSP, inc.  All rights reserved.
// Authors:
//   chiayin.kuo@dsp.im (chiayin), 2023/1/31
/**
 * @module components/Discover/Map/SidebarTraces
 *   Traces sidebar showing path insights with
 *   clickable trace lists for highlighting on the map.
 */

import { ref, computed, watch } from 'vue';
import { storeToRefs } from 'pinia';
import { useLoadingStore } from '@/stores/loading';
import { useAllMapDataStore } from '@/stores/allMapData';
import cytoscapeMapTrace from '@/module/cytoscapeMapTrace.js';

const props = defineProps(['sidebarTraces', 'cases']);
const emit = defineEmits(['switch-Trace-Id']);

const loadingStore = useLoadingStore();
const allMapDataStore = useAllMapDataStore();
const { isLoading } = storeToRefs(loadingStore);
const { infinit404, infiniteStart, traceId, traces, traceTaskSeq, infiniteFirstCases } = storeToRefs(allMapDataStore);

const processMap = ref({
  nodes:[],
  edges:[],
});
const showTraceId = ref(null);
const infinitMaxItems = ref(false);
const infiniteData = ref([]);
const infiniteFinish = ref(true); // 無限滾動是否載入完成
const cyTraceRef = ref(null);

const traceTotal = computed(() => {
  return traces.value.length;
});

const traceList = computed(() => {
  const sum = traces.value.map(trace => trace.count).reduce((acc, cur) => acc + cur, 0);
  const result = traces.value.map(trace => {
    return {
      id: trace.id,
      value: progressWidth(Number(((trace.count / sum) * 100).toFixed(1))),
      count: trace.count.toLocaleString(),
      base_count: trace.count,
      ratio: getPercentLabel(trace.count / sum),
    };
  })
  return result;
});

const caseData = computed(() => {
  const data = JSON.parse(JSON.stringify(infiniteData.value)); // 深拷貝原始 cases 的內容
  data.forEach(item => {
    item.attributes.forEach((attribute, index) => {
      item[`att_${index}`] = attribute.value; // 建立新的 key-value pair
    });
    delete item.attributes; // 刪除原本的 attributes 屬性
  })
  return data;
});

const columnData = computed(() => {
  const data = JSON.parse(JSON.stringify(props.cases)); // 深拷貝原始 cases 的內容
  let result = [
      { field: 'id', header: 'Case Id' },
      { field: 'started_at', header: 'Start time' },
      { field: 'completed_at', header: 'End time' },
    ];
  if(data.length !== 0){
    result = [
      { field: 'id', header: 'Case Id' },
      { field: 'started_at', header: 'Start time' },
      { field: 'completed_at', header: 'End time' },
      ...(data[0]?.attributes ?? []).map((att, index) => ({ field: `att_${index}`, header: att.key })),
    ];
  }
  return result
});

watch(infinit404, (newValue) => {
  if(newValue === 404) infinitMaxItems.value = true;
});

watch(traceId, (newValue) => {
  showTraceId.value = newValue;
}, { immediate: true });

watch(showTraceId, (newValue, oldValue) => {
  const isScrollTop = document.querySelector('.infiniteTable');
  if(isScrollTop && typeof isScrollTop.scrollTop !== 'undefined') if(newValue !== oldValue) isScrollTop.scrollTop = 0;
});

watch(infiniteFirstCases, (newValue) => {
  if(infiniteFirstCases.value) infiniteData.value = JSON.parse(JSON.stringify(newValue));
});

/**
 * Number to percentage
 * @param   {number} val - The raw ratio value.
 * @returns {string} The formatted percentage string.
 */
function getPercentLabel(val){
  if((val * 100).toFixed(1) >= 100) return `100%`;
  else return `${(val * 100).toFixed(1)}%`;
}

/**
 * set progress bar width
 * @param   {number} value - The percentage value.
 * @returns {string} The CSS width style string.
 */
function progressWidth(value){
  return `width:${value}%;`
}

/**
 * switch case data
 * @param {number} id case id
 * @param {number} count - The total number of cases.
 */
async function switchCaseData(id, count) {
  // 點同一筆 id 不要有動作
  if(id == showTraceId.value) return;
  isLoading.value = true; // 都要 loading 畫面
  infinit404.value = null;
  infinitMaxItems.value = false;
  showTraceId.value = id;
  infiniteStart.value = 0;
  emit('switch-Trace-Id', {id: showTraceId.value, count: count}); // 傳遞到 Map index 再關掉 loading
}

/**
 * Assembles the trace element nodes data for Cytoscape rendering.
 */
function setNodesData(){
  // 避免每次渲染都重複累加
  processMap.value.nodes = [];
  // 將 api call 回來的資料帶進 node
  traceTaskSeq.value.forEach((node, index) => {
    processMap.value.nodes.push({
      data: {
        id: index,
        label: node,
        backgroundColor: '#CCE5FF',
        bordercolor: '#003366',
        shape: 'round-rectangle',
        height: 80,
        width: 100
      }
    });
  })
}

/**
 * Assembles the trace edge line data for Cytoscape rendering.
 */
function setEdgesData(){
  processMap.value.edges = [];
  traceTaskSeq.value.forEach((edge, index) => {
    processMap.value.edges.push({
      data: {
        source: `${index}`,
        target: `${index + 1}`,
        lineWidth: 1,
        style: 'solid'
      }
    });
  });
  // 關係線數量筆節點少一個
  processMap.value.edges.pop();
}

/**
 * create trace cytoscape's map
 */
function createCy(){
  const graphId = cyTraceRef.value;

  setNodesData();
  setEdgesData();
  cytoscapeMapTrace(processMap.value.nodes, processMap.value.edges, graphId);
}

/**
 * create map
 */
async function show() {
  isLoading.value = await true; // createCy 執行完關閉
  // 因 trace api 連動，所以關閉側邊欄時讓數值歸 traces 第一筆 id
  showTraceId.value = await traces.value[0]?.id;
  infiniteStart.value = await 0;
  setNodesData();
  setEdgesData();
  createCy();
  isLoading.value = false;
}

/**
 * Infinite scroll: listens for scroll reaching the bottom.
 * @param {Event} event - The scroll event.
 */
function handleScroll(event) {
  if(infinitMaxItems.value || props.cases.length < 20 || infiniteFinish.value === false) return;

  const container = event.target;
  const overScrollHeight = container.scrollTop + container.clientHeight >= container.scrollHeight;

  if(overScrollHeight) fetchData();
}

/**
 * Infinite scroll: loads more data when the bottom is reached.
 */
async function fetchData() {
  try {
    isLoading.value = true;
    infiniteFinish.value = false;
    infiniteStart.value += 20;
    await allMapDataStore.getTraceDetail();
    infiniteData.value = await [...infiniteData.value, ...props.cases];
    infiniteFinish.value = await true;
    isLoading.value = await false;
  } catch(error) {
    console.error('Failed to load data:', error);
  }
}
</script>

<style scoped>
@reference "../../../assets/tailwind.css";
/* 進度條顏色 */
:deep(.p-progressbar .p-progressbar-value) {
  @apply bg-primary
}
/* Table set */
:deep(.p-datatable-thead) {
  @apply sticky top-0 left-0 z-10 bg-neutral-10
}
:deep(.p-datatable .p-datatable-thead > tr > th) {
  @apply !border-y-0 border-neutral-500 bg-neutral-100 after:absolute after:left-0 after:w-full after:h-full after:block after:top-0 after:border-b after:border-t after:border-neutral-500;
  white-space: nowrap;
}
:deep(.p-datatable .p-datatable-tbody > tr > td) {
  @apply border-neutral-500 !border-t-0 text-center
}
:deep(.p-datatable.p-datatable-gridlines .p-datatable-tbody > tr > td) {
  min-width: 72px;
  max-width: 184px;
  overflow-wrap: break-word;
  word-wrap: break-word;
}
/* datatable head 置中 */
:deep(.p-column-header-content) {
  @apply justify-center
}
</style>
