<script>
import { merge } from 'lodash';
import { GlLineChart } from '@gitlab/ui/dist/charts';
import dateFormat from 'dateformat';
import ResizableChartContainer from '~/vue_shared/components/resizable_chart/resizable_chart_container.vue';
import { __, n__, sprintf } from '~/locale';
import commonChartOptions from './common_chart_options';

export default {
  components: {
    GlLineChart,
    ResizableChartContainer,
  },
  props: {
    startDate: {
      type: String,
      required: true,
    },
    dueDate: {
      type: String,
      required: true,
    },
    issuesSelected: {
      type: Boolean,
      required: false,
      default: true,
    },
    burnupData: {
      type: Array,
      required: false,
      default: () => [],
    },
  },
  data() {
    return {
      tooltip: {
        title: '',
        content: '',
      },
    };
  },
  computed: {
    scopeCount() {
      return this.transform('scopeCount');
    },
    completedCount() {
      return this.transform('completedCount');
    },
    scopeWeight() {
      return this.transform('scopeWeight');
    },
    completedWeight() {
      return this.transform('completedWeight');
    },
    dataSeries() {
      const series = [
        {
          name: __('Total'),
          data: this.issuesSelected ? this.scopeCount : this.scopeWeight,
        },
        {
          name: __('Completed'),
          data: this.issuesSelected ? this.completedCount : this.completedWeight,
        },
      ];

      return series;
    },
    options() {
      return merge({}, commonChartOptions, {
        xAxis: {
          min: this.startDate,
          max: this.dueDate,
        },
        yAxis: {
          name: __('Total issues'),
        },
      });
    },
  },
  methods: {
    // transform the object to a chart-friendly array of date + value
    transform(key) {
      return this.burnupData.map(val => [val.date, val[key]]);
    },
    formatTooltipText(params) {
      const [total, completed] = params.seriesData;
      if (!total || !completed) {
        return;
      }

      this.tooltip.title = dateFormat(params.value, 'dd mmm yyyy');

      const count = total.value[1];
      const completedCount = completed.value[1];

      let totalText = n__('%d open issue', '%d open issues', count);
      let completedText = n__('%d completed issue', '%d completed issues', completedCount);

      if (!this.issuesSelected) {
        totalText = sprintf(__('%{count} total weight'), { count });
        completedText = sprintf(__('%{completedCount} completed weight'), { completedCount });
      }

      this.tooltip.total = totalText;
      this.tooltip.completed = completedText;
    },
  },
};
</script>

<template>
  <div data-qa-selector="burnup_chart">
    <div class="burndown-header d-flex align-items-center">
      <h3>{{ __('Burnup chart') }}</h3>
    </div>
    <resizable-chart-container class="js-burnup-chart">
      <gl-line-chart
        :data="dataSeries"
        :option="options"
        :format-tooltip-text="formatTooltipText"
        :include-legend-avg-max="false"
      >
        <template slot="tooltipTitle">{{ tooltip.title }}</template>
        <template slot="tooltipContent">
          <div>{{ tooltip.total }}</div>
          <div>{{ tooltip.completed }}</div>
        </template>
      </gl-line-chart>
    </resizable-chart-container>
  </div>
</template>
