Ghost/ghost/admin/app/components/dashboard/v5/chart-email.js

import Component from '@glimmer/component';
import {action} from '@ember/object';
import {inject as service} from '@ember/service';

export default class ChartEmailOpenRate extends Component {
    @service dashboardStats;

    /**
     * Call this method when you need to fetch new data from the server. In this component, it will get called
     * when the days parameter changes and on initialisation.
     */
    @action
    loadCharts() {
        // The dashboard stats service will take care or reusing and limiting API-requests between charts
        this.dashboardStats.loadNewsletterSubscribers();
        this.dashboardStats.loadEmailsSent();
        this.dashboardStats.loadEmailOpenRateStats();
    }
    
    get dataSubscribers() {
        // @todo: show paid, free, total together
        return this.dashboardStats.newsletterSubscribers ?? {
            total: 0,
            free: 0,
            paid: 0
        };
    }

    get dataEmailsSent() {
        return this.dashboardStats.emailsSent30d ?? 0;
    }

    get loading() {
        return this.dashboardStats.emailOpenRateStats === null;
    }

    get chartType() {
        return 'bar';
    }

    get chartData() {
        const stats = this.dashboardStats.emailOpenRateStats.filter(stat => stat.email.deliveredCount > 0);
        const labels = stats.map(stat => stat.title);
        const data = stats.map(stat => stat.email.openedCount / stat.email.deliveredCount * 100);

        return {
            labels,
            datasets: [{
                data,
                fill: false,
                backgroundColor: '#14b8ff',
                tension: 0.1
            }]
        };
    }

    get chartOptions() {
        return {
            legend: {
                display: false
            }
        };
    }

    get chartHeight() {
        return 100;
    }
}