<template>
    <div>
        <div class="content-section introduction">
            <div class="feature-intro">
                <h1>Combo Chart</h1>
                <p>Different chart types can be combined in the same graph.</p>
            </div>
            <AppDemoActions />
        </div>

        <div class="content-section implementation">
            <div class="card">
                <Chart type="bar" :data="chartData" :options="chartOptions" />
            </div>
        </div>

        <ComboChartDoc />
    </div>
</template>

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

export default {
    themeChangeListener: null,
    data() {
        return {
            chartData: {
                labels: ['January', 'February', 'March', 'April', 'May', 'June', 'July'],
                datasets: [
                    {
                        type: 'line',
                        label: 'Dataset 1',
                        borderColor: '#42A5F5',
                        borderWidth: 2,
                        fill: false,
                        data: [50, 25, 12, 48, 56, 76, 42]
                    },
                    {
                        type: 'bar',
                        label: 'Dataset 2',
                        backgroundColor: '#66BB6A',
                        data: [21, 84, 24, 75, 37, 65, 34],
                        borderColor: 'white',
                        borderWidth: 2
                    },
                    {
                        type: 'bar',
                        label: 'Dataset 3',
                        backgroundColor: '#FFA726',
                        data: [41, 52, 24, 74, 23, 21, 32]
                    }
                ]
            },
            chartOptions: this.isDarkTheme() ? this.applyDarkTheme() : this.applyLightTheme()
        };
    },
    mounted() {
        this.themeChangeListener = (event) => {
            if (event.dark) this.applyDarkTheme();
            else this.applyLightTheme();
        };

        EventBus.on('theme-change', this.themeChangeListener);

        if (this.isDarkTheme()) {
            this.applyDarkTheme();
        }
    },
    beforeUnmount() {
        EventBus.off('change-theme', this.themeChangeListener);
    },
    methods: {
        isDarkTheme() {
            return this.$appState.darkTheme === true;
        },
        applyLightTheme() {
            this.chartOptions = {
                plugins: {
                    legend: {
                        labels: {
                            color: '#495057'
                        }
                    }
                },
                scales: {
                    x: {
                        ticks: {
                            color: '#495057'
                        },
                        grid: {
                            color: '#ebedef'
                        }
                    },
                    y: {
                        ticks: {
                            color: '#495057'
                        },
                        grid: {
                            color: '#ebedef'
                        }
                    }
                }
            };
        },
        applyDarkTheme() {
            this.chartOptions = {
                plugins: {
                    legend: {
                        labels: {
                            color: '#ebedef'
                        }
                    }
                },
                scales: {
                    x: {
                        ticks: {
                            color: '#ebedef'
                        },
                        grid: {
                            color: 'rgba(255,255,255,0.2)'
                        }
                    },
                    y: {
                        ticks: {
                            color: '#ebedef'
                        },
                        grid: {
                            color: 'rgba(255,255,255,0.2)'
                        }
                    }
                }
            };
        }
    },
    components: {
        ComboChartDoc: ComboChartDoc
    }
};
</script>
