<template>
  <div class="build-view-container">
    <div class="build-view-left">
      <div class="build-info-summary">{{ buildInfo.title }}</div>

      <div class="job-group-section" v-for="(jobGroup, i) in allJobGroups" :key="i">
        <div class="job-group-summary">
          {{ jobGroup.summary }}
        </div>
        <div class="job-brief-list">
          <a class="job-brief-item" v-for="job in jobGroup.jobs" :key="job.id">
            <SvgIcon name="octicon-check-circle-fill" class="green" v-if="job.status === 'success'"/>
            <SvgIcon name="octicon-skip" class="ui text grey" v-else-if="job.status === 'skipped'"/>
            <SvgIcon name="octicon-clock" class="ui text yellow" v-else-if="job.status === 'waiting'"/>
            <SvgIcon name="octicon-x-circle-fill" class="red" v-else/>
            {{ job.name }}
          </a>
        </div>
      </div>
    </div>

    <div class="build-view-right">
      <div class="job-info-header">
        <div class="job-info-header-title">
          {{ currentJobInfo.title }}
        </div>
        <div class="job-info-header-detail">
          {{ currentJobInfo.detail }}
        </div>
      </div>
      <div class="job-step-container">
        <div class="job-step-section" v-for="(jobStep, i) in currentJobSteps" :key="i">
          <div class="job-step-summary" @click.stop="toggleStepLogs(i)">
            <SvgIcon name="octicon-chevron-down" class="mr-3" v-show="currentJobStepsStates[i].expanded"/>
            <SvgIcon name="octicon-chevron-right" class="mr-3" v-show="!currentJobStepsStates[i].expanded"/>

            <SvgIcon name="octicon-check-circle-fill" class="green mr-3 " v-if="jobStep.status === 'success'"/>
            <SvgIcon name="octicon-skip" class="ui text grey mr-3 " v-else-if="jobStep.status === 'skipped'"/>
            <SvgIcon name="octicon-clock" class="ui text yellow mr-3 " v-else-if="jobStep.status === 'waiting'"/>
            <SvgIcon name="octicon-x-circle-fill" class="red mr-3 " v-else/>

            <span class="step-summary-msg">{{ jobStep.summary }}</span>
            <span class="step-summary-dur">{{ Math.round(jobStep.duration/1000) }}s</span>
          </div>

          <!-- the log elements could be a lot, do not use v-if to destroy/reconstruct the DOM -->
          <div class="job-step-logs" ref="elJobStepLogs" v-show="currentJobStepsStates[i].expanded">
            <!--
            <div class="job-log-group">
              <div class="job-log-group-summary"></div>
              <div class="job-log-list">
                <div class="job-log-line"></div>
              </div>
            </div>
            -->

            <!--
            <div class="job-log-line"></div>
            -->
          </div>
        </div>
      </div>
    </div>
  </div>
</template>

<script>
import {SvgIcon} from '../svg.js';
import Vue from 'vue';

const sfc = {
  name: 'RepoBuildView',
  components: {
    SvgIcon,
  },

  data() {
    return {
      // internal state
      loading: false,
      currentJobStepsStates: [],

      // provided by backend
      buildInfo: {},
      allJobGroups: [],
      currentJobInfo: {},
      currentJobSteps: [],
    };
  },

  mounted() {
    const elBodyDiv = document.querySelector('body > div.full.height');
    elBodyDiv.style.height = '100%';
    this.loadJobData();
  },

  methods: {
    stepLogsGetActiveContainer(idx) {
      const el = this.$refs.elJobStepLogs[idx];
      return el._stepLogsActiveContainer ?? el;
    },
    stepLogsGroupBegin(idx) {
      const el = this.$refs.elJobStepLogs[idx];

      const elJobLogGroup = document.createElement('div');
      elJobLogGroup.classList.add('job-log-group');

      const elJobLogGroupSummary = document.createElement('div');
      elJobLogGroupSummary.classList.add('job-log-group-summary');

      const elJobLogList = document.createElement('div');
      elJobLogList.classList.add('job-log-list');

      elJobLogGroup.appendChild(elJobLogGroupSummary);
      elJobLogGroup.appendChild(elJobLogList);
      el._stepLogsActiveContainer = elJobLogList;
    },
    stepLogsGroupEnd(idx) {
      const el = this.$refs.elJobStepLogs[idx];
      el._stepLogsActiveContainer = null;
    },

    toggleStepLogs(idx) {
      this.currentJobStepsStates[idx].expanded = !this.currentJobStepsStates[idx].expanded;
    },

    createLogLine(line) {
      const el = document.createElement('div');
      el.classList.add('job-log-line');
      el._jobLogTime = line.t;

      const elLineNum = document.createElement('line-num');
      elLineNum.innerText = line.ln;
      el.appendChild(elLineNum);

      const elLogTime = document.createElement('log-time');
      elLogTime.innerText = new Date(line.t).toUTCString();
      el.appendChild(elLogTime);

      const elLogMsg = document.createElement('log-msg');
      elLogMsg.innerText = line.m;
      el.appendChild(elLogMsg);

      return el;
    },

    appendLogs(stepIndex, logLines) {
      for (const line of logLines) {
        // TODO: group support: ##[group]GroupTitle , ##[endgroup]
        const el = this.stepLogsGetActiveContainer(stepIndex);
        el.append(this.createLogLine(line));
      }
    },

    fetchMockData(reqData) {
      const stateData = {
        buildInfo: {title: 'The Demo Build'},
        allJobGroups: [
          {summary: 'Job Group Foo', jobs: [{id: 1, name: 'Job A', status: 'success'}, {id: 2, name: 'Job B', status: 'error'}]},
          {summary: 'Job Group Bar', jobs: [{id: 3, name: 'Job X', status: 'skipped'}, {id: 4, name: 'Job Y', status: 'waiting'}]},
        ],
        currentJobInfo: {title: 'the job title', detail: ' succeeded 3 hours ago in 11s'},
        currentJobSteps: [
          {summary: 'Job Step 1', duration: 3000, status: 'success'},
          {summary: 'Job Step 2', duration: 3000, status: 'error'},
          {summary: 'Job Step 3', duration: 3000, status: 'skipped'},
          {summary: 'Job Step 4', duration: 3000, status: 'waiting'},
        ],
      };
      const logsData = {streamingLogs: []};

      for (const reqCursor of reqData.stepLogCursors) {
        if (!reqCursor.expanded) continue;
        // if (reqCursor.cursor > 100) continue;
        const stepIndex = reqCursor.stepIndex;
        let cursor = reqCursor.cursor;
        const lines = [];
        for (let i = 0; i < 110; i++) {
          lines.push({
            ln: cursor+0, // line number
            m: `hello world ${Date.now()}, cursor: ${cursor}`,
            t: Date.now(),
            d: 3000, // duration
          });
          cursor++;
        }
        logsData.streamingLogs.push({stepIndex, cursor, lines});
      }
      return {stateData, logsData};
    },

    async fetchJobData(reqData) {
      const resp = await fetch(`?job_id=${this.jobId}`, {method: 'POST', body: JSON.stringify(reqData)});
      return await resp.json();
    },

    async loadJobData() {
      try {
        if (this.loading) return;
        this.loading = true;

        const stepLogCursors = this.currentJobStepsStates.map((it, idx) => {return {stepIndex: idx, cursor: it.cursor, expanded: it.expanded}});
        const reqData = {stepLogCursors};

        // const data = await this.fetchJobData();
        const data = this.fetchMockData(reqData);

        console.log('loadJobData', data);

        for (const [key, value] of Object.entries(data.stateData)) {
          this[key] = value;
        }
        for (let i = 0; i < this.currentJobSteps.length; i++) {
          if (!this.currentJobStepsStates[i]) {
            this.$set(this.currentJobStepsStates, i, {cursor: null, expanded: false});
          }
        }
        for (const [_, logs] of data.logsData.streamingLogs.entries()) {
          this.currentJobStepsStates[logs.stepIndex].cursor = logs.cursor;
          this.appendLogs(logs.stepIndex, logs.lines);
        }
      } finally {
        this.loading = false;
        setTimeout(() => this.loadJobData(), 1000);
      }
    }
  },
};

export default sfc;

export function initRepositoryBuildView() {
  const el = document.getElementById('repo-build-view');
  if (!el) return;

  const View = Vue.extend({
    render: (createElement) => createElement(sfc),
  });
  new View().$mount(el);
}

</script>

<style scoped lang="less">

.build-view-container {
  display: flex;
  height: 100%;
}

// ================
// build view left

.build-view-left {
  width: 20%;
  overflow-y: scroll;
  margin-left: 10px;
}

.build-info-summary {
  font-size: 150%;
  margin: 5px 0;
}

.job-group-section {
  .job-group-summary {
    margin: 5px 0;
    padding: 10px;
  }

  .job-brief-list {
    a.job-brief-item {
      display: block;
      margin: 5px 0;
      padding: 10px;
      background: #f8f8f8;
      border-radius: 5px;
      text-decoration: none;
    }
  }
}



// ================
// build view right

.build-view-right {
  flex: 1;
  background-color: #262626;
  color: #d6d6d6;
  max-height: 100%;

  display: flex;
  flex-direction: column;
}

.job-info-header {
  .job-info-header-title {
    color: #fdfdfd;
    font-size: 150%;
    padding: 10px;
  }
  .job-info-header-detail {
    padding: 0 10px 10px;
    border-bottom: 1px solid #666;
  }
}

.job-step-container {
  max-height: 100%;
  overflow: auto;

  .job-step-summary {
    cursor: pointer;
    padding: 5px 10px;
    display: flex;

    .step-summary-msg {
      flex: 1;
    }
    .step-summary-dur {
      margin-left: 16px;
    }
  }
  .job-step-summary:hover {
    background-color: #333;
  }
}
</style>

<style lang="less">
// some elements are not managed by vue, so we need to use global style
.job-step-section {
  margin: 10px;
  .job-step-logs {
    .job-log-line {
      display: flex;
      line-num {
        width: 48px;
        color: #555;
        text-align: right;
      }
      log-time {
        color: #777;
        margin-left: 16px;
      }
      log-msg {
        flex: 1;
        margin-left: 16px;
      }
    }

    // TODO: group support
    .job-log-group {
    }

    .job-log-group-summary {
    }

    .job-log-list {
    }
  }
}
</style>