<template>
    <DocSectionText v-bind="$attrs">
        <p>A pie chart is a circular statistical graphic which is divided into slices to illustrate numerical proportion.</p>
    </DocSectionText>
    <div class="card flex justify-content-center">
        <Chart type="pie" :data="chartData" :options="chartOptions" class="w-full md:w-30rem" />
    </div>
    <DocSectionCode :code="code" :dependencies="{ 'chart.js': '3.3.2' }" component="Chart" />
</template>

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

export default {
    redrawListener: null,
    data() {
        return {
            chartData: null,
            chartOptions: null,
            code: {
                basic: `
<Chart type="pie" :data="chartData" :options="chartOptions" class="w-full md:w-30rem" />
`,
                options: `
<template>
    <div class="card flex justify-content-center">
        <Chart type="pie" :data="chartData" :options="chartOptions" class="w-full md:w-30rem" />
    </div>
</template>

<script>
export default {
    data() {
        return {
            chartData: null,
            chartOptions: null
        };
    },
    mounted() {
        this.chartData = this.setChartData();
        this.chartOptions = this.setChartOptions();
    },
    methods: {
        setChartData() {
            const documentStyle = getComputedStyle(document.body);

            return {
                labels: ['A', 'B', 'C'],
                datasets: [
                    {
                        data: [540, 325, 702],
                        backgroundColor: [documentStyle.getPropertyValue('--p-cyan-500'), documentStyle.getPropertyValue('--p-orange-500'), documentStyle.getPropertyValue('--p-gray-500')],
                        hoverBackgroundColor: [documentStyle.getPropertyValue('--p-cyan-400'), documentStyle.getPropertyValue('--p-orange-400'), documentStyle.getPropertyValue('--p-gray-400')]
                    }
                ]
            };
        },
        setChartOptions() {
            const documentStyle = getComputedStyle(document.documentElement);
            const textColor = documentStyle.getPropertyValue('--text-color');

            return {
                plugins: {
                    legend: {
                        labels: {
                            usePointStyle: true,
                            color: textColor
                        }
                    }
                }
            };
        }
    }
};
<\/script>
`,
                composition: `
<template>
    <div class="card flex justify-content-center">
        <Chart type="pie" :data="chartData" :options="chartOptions" class="w-full md:w-30rem" />
    </div>
</template>

<script setup>
import { ref, onMounted } from "vue";

onMounted(() => {
    chartData.value = setChartData();
    chartOptions.value = setChartOptions();
});

const chartData = ref();
const chartOptions = ref();

const setChartData = () => {
    const documentStyle = getComputedStyle(document.body);

    return {
        labels: ['A', 'B', 'C'],
        datasets: [
            {
                data: [540, 325, 702],
                backgroundColor: [documentStyle.getPropertyValue('--p-cyan-500'), documentStyle.getPropertyValue('--p-orange-500'), documentStyle.getPropertyValue('--p-gray-500')],
                hoverBackgroundColor: [documentStyle.getPropertyValue('--p-cyan-400'), documentStyle.getPropertyValue('--p-orange-400'), documentStyle.getPropertyValue('--p-gray-400')]
            }
        ]
    };
};

const setChartOptions = () => {
    const documentStyle = getComputedStyle(document.documentElement);
    const textColor = documentStyle.getPropertyValue('--text-color');

    return {
        plugins: {
            legend: {
                labels: {
                    usePointStyle: true,
                    color: textColor
                }
            }
        }
    };
};
<\/script>
`
            }
        };
    },
    beforeUnmount() {
        EventBus.off('dark-mode-toggle-complete', this.redrawListener);
        EventBus.off('theme-palette-change', this.redrawListener);
    },
    mounted() {
        this.chartData = this.setChartData();
        this.chartOptions = this.setChartOptions();

        this.redrawListener = () => {
            this.chartOptions = this.setChartOptions();
        };

        EventBus.on('theme-palette-change', this.redrawListener);
        EventBus.on('dark-mode-toggle-complete', this.redrawListener);
    },
    methods: {
        setChartData() {
            const documentStyle = getComputedStyle(document.documentElement);

            return {
                labels: ['A', 'B', 'C'],
                datasets: [
                    {
                        data: [540, 325, 702],
                        backgroundColor: [documentStyle.getPropertyValue('--p-cyan-500'), documentStyle.getPropertyValue('--p-orange-500'), documentStyle.getPropertyValue('--p-gray-500')],
                        hoverBackgroundColor: [documentStyle.getPropertyValue('--p-cyan-400'), documentStyle.getPropertyValue('--p-orange-400'), documentStyle.getPropertyValue('--p-gray-400')]
                    }
                ]
            };
        },
        setChartOptions() {
            const documentStyle = getComputedStyle(document.documentElement);
            const textColor = documentStyle.getPropertyValue('--text-color');

            return {
                plugins: {
                    legend: {
                        labels: {
                            usePointStyle: true,
                            color: textColor
                        }
                    }
                }
            };
        }
    }
};
</script>