<template>
    <div>
        <div class="content-section introduction">
            <div class="feature-intro">
                <h1>DoughnutChart</h1>
                <p>A doughnut chart is a variant of the pie chart, with a blank center allowing for additional information about the data as a whole to be included.</p>
            </div>
            <AppDemoActions />
        </div>

        <div class="content-section implementation">
            <div class="card flex justify-content-center">
                <Chart type="doughnut" :data="chartData" :options="chartOptions" style="width: 40%" />
            </div>
        </div>

        <DoughnutChartDoc />
    </div>
</template>

<script>
import DoughnutChartDoc from './DoughnutChartDoc';
import EventBus from '@/layouts/AppEventBus';

export default {
    themeChangeListener: null,
    mounted() {
        this.themeChangeListener = (event) => {
            if (event.dark) this.chartOptions = this.getDarkTheme();
            else this.chartOptions = this.getLightTheme();
        };
        EventBus.on('theme-change', this.themeChangeListener);
    },
    beforeUnmount() {
        EventBus.off('change-theme', this.themeChangeListener);
    },
    data() {
        return {
            chartData: {
                labels: ['A', 'B', 'C'],
                datasets: [
                    {
                        data: [300, 50, 100],
                        backgroundColor: ['#FF6384', '#36A2EB', '#FFCE56'],
                        hoverBackgroundColor: ['#FF6384', '#36A2EB', '#FFCE56']
                    }
                ]
            },
            chartOptions: this.isDarkTheme() ? this.getDarkTheme() : this.getLightTheme()
        };
    },
    methods: {
        isDarkTheme() {
            return this.$appState.darkTheme === true;
        },
        getLightTheme() {
            return {
                plugins: {
                    legend: {
                        labels: {
                            color: '#495057'
                        }
                    }
                }
            };
        },
        getDarkTheme() {
            return {
                plugins: {
                    legend: {
                        labels: {
                            color: '#ebedef'
                        }
                    }
                }
            };
        }
    },
    components: {
        DoughnutChartDoc: DoughnutChartDoc
    }
};
</script>
