import CalHeatMap from 'cal-heatmap';
import Chart from 'chart.js';
import { addMonths, format } from 'date-fns';

// eslint-disable-next-line @typescript-eslint/no-non-null-assertion
const graphData = JSON.parse(document.getElementById('graph-data')!.textContent as string);

function createLineGraph(id: string, labels: string[], data: any) {
    const context = (document.getElementById(id) as HTMLCanvasElement).getContext('2d');
    // eslint-disable-next-line @typescript-eslint/no-non-null-assertion
    return new Chart(context!, {
        type: 'line',
        data: {
            labels: labels,
            datasets: [
                {
                    data: data,
                    backgroundColor: 'rgba(255, 99, 132, 0.2)',
                    borderColor: 'rgba(255, 99, 132, 1)',
                    borderWidth: 1,
                },
            ],
        },
        options: {
            legend: {
                display: false,
            },
            elements: {
                line: {
                    tension: 0,
                },
            },
            scales: {
                yAxes: [
                    {
                        ticks: {
                            beginAtZero: true,
                        },
                    },
                ],
            },
            tooltips: {
                mode: 'index',
                intersect: false,
            },
        },
    });
}

function createBarGraph(id: string, labels: string[], data: any) {
    const context = (document.getElementById(id) as HTMLCanvasElement).getContext('2d');
    // eslint-disable-next-line @typescript-eslint/no-non-null-assertion
    new Chart(context!, {
        type: 'bar',
        data: {
            labels: labels,
            datasets: [
                {
                    data: data,
                    backgroundColor: 'rgba(255, 99, 132, 0.2)',
                    borderColor: 'rgba(255, 99, 132, 1)',
                    borderWidth: 1,
                },
            ],
        },
        options: {
            legend: {
                display: false,
            },
            scales: {
                yAxes: [
                    {
                        ticks: {
                            beginAtZero: true,
                        },
                    },
                ],
            },
            tooltips: {
                mode: 'index',
                intersect: false,
            },
        },
    });
}

function createMonthlyGraphData(from: Date) {
    const keys = [];
    const values = [];

    for (let i = 0; i < 12; i++) {
        const current = addMonths(from, i);
        const yearAndMonth = format(current, 'YYYY/MM');
        keys.push(yearAndMonth);
        values.push(graphData.monthlySum[yearAndMonth] || 0);
    }

    return { keys, values };
}

function getCurrentYear(): number {
    const year = location.pathname.split('/').pop() || '';
    if (/^(20[0-9]{2})$/.test(year)) {
        return parseInt(year, 10);
    } else {
        throw 'Invalid year';
    }
}

if (document.getElementById('cal-heatmap')) {
    new CalHeatMap().init({
        itemSelector: '#cal-heatmap',
        domain: 'month',
        subDomain: 'day',
        domainLabelFormat: '%Y/%m',
        weekStartOnMonday: false,
        start: new Date(getCurrentYear(), 0, 1, 0, 0, 0, 0),
        range: 12,
        data: graphData.dailySum,
        legend: [1, 2, 3, 4],
    });
}

if (document.getElementById('monthly-graph')) {
    const { keys: monthlyKey, values: monthlySum } = createMonthlyGraphData(
        new Date(getCurrentYear(), 0, 1, 0, 0, 0, 0)
    );
    createLineGraph('monthly-graph', monthlyKey, monthlySum);
}
if (document.getElementById('yearly-graph')) {
    createLineGraph('yearly-graph', graphData.yearlyKey, graphData.yearlySum);
}
if (document.getElementById('hourly-graph')) {
    createBarGraph('hourly-graph', graphData.hourlyKey, graphData.hourlySum);
}
if (document.getElementById('dow-graph')) {
    createBarGraph('dow-graph', ['日', '月', '火', '水', '木', '金', '土'], graphData.dowSum);
}