1 files changed, 151 insertions, 0 deletions
diff --git a/app/javascript/flavours/glitch/components/admin/Retention.js b/app/javascript/flavours/glitch/components/admin/Retention.js
new file mode 100644
index 000000000..e1ba3f6c9
--- /dev/null
+++ b/app/javascript/flavours/glitch/components/admin/Retention.js
@@ -0,0 +1,151 @@
+import React from 'react';
+import PropTypes from 'prop-types';
+import api from 'flavours/glitch/api';
+import { FormattedMessage, FormattedNumber, FormattedDate } from 'react-intl';
+import classNames from 'classnames';
+import { roundTo10 } from 'flavours/glitch/utils/numbers';
+
+const dateForCohort = cohort => {
+  switch(cohort.frequency) {
+  case 'day':
+    return <FormattedDate value={cohort.period} month='long' day='2-digit' />;
+  default:
+    return <FormattedDate value={cohort.period} month='long' year='numeric' />;
+  }
+};
+
+export default class Retention extends React.PureComponent {
+
+  static propTypes = {
+    start_at: PropTypes.string,
+    end_at: PropTypes.string,
+    frequency: PropTypes.string,
+  };
+
+  state = {
+    loading: true,
+    data: null,
+  };
+
+  componentDidMount () {
+    const { start_at, end_at, frequency } = this.props;
+
+    api().post('/api/v1/admin/retention', { start_at, end_at, frequency }).then(res => {
+      this.setState({
+        loading: false,
+        data: res.data,
+      });
+    }).catch(err => {
+      console.error(err);
+    });
+  }
+
+  render () {
+    const { loading, data } = this.state;
+    const { frequency } = this.props;
+
+    let content;
+
+    if (loading) {
+      content = <FormattedMessage id='loading_indicator.label' defaultMessage='Loading...' />;
+    } else {
+      content = (
+        <table className='retention__table'>
+          <thead>
+            <tr>
+              <th>
+                <div className='retention__table__date retention__table__label'>
+                  <FormattedMessage id='admin.dashboard.retention.cohort' defaultMessage='Sign-up month' />
+                </div>
+              </th>
+
+              <th>
+                <div className='retention__table__number retention__table__label'>
+                  <FormattedMessage id='admin.dashboard.retention.cohort_size' defaultMessage='New users' />
+                </div>
+              </th>
+
+              {data[0].data.slice(1).map((retention, i) => (
+                <th key={retention.date}>
+                  <div className='retention__table__number retention__table__label'>
+                    {i + 1}
+                  </div>
+                </th>
+              ))}
+            </tr>
+
+            <tr>
+              <td>
+                <div className='retention__table__date retention__table__average'>
+                  <FormattedMessage id='admin.dashboard.retention.average' defaultMessage='Average' />
+                </div>
+              </td>
+
+              <td>
+                <div className='retention__table__size'>
+                  <FormattedNumber value={data.reduce((sum, cohort, i) => sum + ((cohort.data[0].value * 1) - sum) / (i + 1), 0)} maximumFractionDigits={0} />
+                </div>
+              </td>
+
+              {data[0].data.slice(1).map((retention, i) => {
+                const average = data.reduce((sum, cohort, k) => cohort.data[i + 1] ? sum + (cohort.data[i + 1].rate - sum)/(k + 1) : sum, 0);
+
+                return (
+                  <td key={retention.date}>
+                    <div className={classNames('retention__table__box', 'retention__table__average', `retention__table__box--${roundTo10(average * 100)}`)}>
+                      <FormattedNumber value={average} style='percent' />
+                    </div>
+                  </td>
+                );
+              })}
+            </tr>
+          </thead>
+
+          <tbody>
+            {data.slice(0, -1).map(cohort => (
+              <tr key={cohort.period}>
+                <td>
+                  <div className='retention__table__date'>
+                    {dateForCohort(cohort)}
+                  </div>
+                </td>
+
+                <td>
+                  <div className='retention__table__size'>
+                    <FormattedNumber value={cohort.data[0].value} />
+                  </div>
+                </td>
+
+                {cohort.data.slice(1).map(retention => (
+                  <td key={retention.date}>
+                    <div className={classNames('retention__table__box', `retention__table__box--${roundTo10(retention.rate * 100)}`)}>
+                      <FormattedNumber value={retention.rate} style='percent' />
+                    </div>
+                  </td>
+                ))}
+              </tr>
+            ))}
+          </tbody>
+        </table>
+      );
+    }
+
+    let title = null;
+    switch(frequency) {
+    case 'day':
+      title = <FormattedMessage id='admin.dashboard.daily_retention' defaultMessage='User retention rate by day after sign-up' />;
+      break;
+    default:
+      title = <FormattedMessage id='admin.dashboard.monthly_retention' defaultMessage='User retention rate by month after sign-up' />;
+    }
+
+    return (
+      <div className='retention'>
+        <h4>{title}</h4>
+
+        {content}
+      </div>
+    );
+  }
+
+}