function setContinentsLoading(isLoading) {
    $('#searchButton').prop('disabled', isLoading);
}

function continentsRender(mode, band) {
    setContinentsLoading(true);
    $('.alert').remove();

    $.ajax({
        url: base_url + 'index.php/continents/get_continents',
        type: 'post',
        data: {
            mode: mode,
            band: band,
        },
        dataType: 'json',
        success: function (data) {
            setContinentsLoading(false);
            totalContinentQsos(data);
        },
        error: function () {
            setContinentsLoading(false);
            $('#continentContainer').html('<div class="alert alert-danger" role="alert">Unable to load continent statistics.</div>');
        },
    });
}

function totalContinentQsos(data) {
    // using this to change color of legend and label according to background color
    var color = ifDarkModeThemeReturn('white', 'grey');

            if (data.length > 0) {
                $('.continentstable > tbody').empty();

                var labels = [];
                var dataQso = [];
                var totalQso = Number(0);

                var $myTableBody = $('.continentstable > tbody');
                var i = 1;

                // building the rows in the table
                var rowElements = data.map(function (row) {

                    var $row = $('<tr></tr>');

                    var $iterator = $('<td></td>').html(i++);
                    var $type = $('<td></td>').html(row.cont);
                    var $content = $('<td></td>').html(row.count);

                    $row.append($iterator, $type, $content);

                    return $row;
                });

                // finally inserting the rows
                $myTableBody.append(rowElements);

                $.each(data, function () {
                    labels.push(this.cont);
                    dataQso.push(this.count);
                    totalQso = Number(totalQso) + Number(this.count);
                });

                const COLORS = ["#3366cc", "#dc3912", "#ff9900", "#109618", "#990099", "#0099c6", "#dd4477", "#66aa00", "#b82e2e", "#316395", "#994499"]
                
                let chartStatus = Chart.getChart("continentChart"); // <canvas> id
                if (chartStatus != undefined) {
                    chartStatus.destroy();
                }
                
                var ctx = document.getElementById("continentChart").getContext('2d');
                var myChart = new Chart(ctx, {
                    plugins: [ChartPieChartOutlabels],
                    type: 'doughnut',
                    data: {
                        labels: labels,
                        datasets: [{
                            borderColor: 'rgba(54, 162, 235, 1)',
                            label: 'Number of QSO\'s worked',
                            data: dataQso,
                            backgroundColor: ["#3366cc", "#dc3912", "#ff9900", "#109618", "#990099", "#0099c6", "#dd4477", "#66aa00", "#b82e2e", "#316395", "#994499"],
                            borderWidth: 1,
                            labels: labels,
                        }]
                    },

                    options: {
                        layout: {
                            padding: 100
                        },
                        title: {
                            fontColor: color,
                            fullSize: true,
                        },
                        responsive: false,
                        maintainAspectRatio: true,
                        plugins: {
                            legend: {
                                display: false,
                                labels: {
                                    boxWidth: 15,
                                    color: color,
                                    font: {
                                        size: 14,
                                    }
                                },
                                position: 'right',
                                align: "middle"
                            },
                            outlabels: {
                                backgroundColor: COLORS,
                                borderColor: COLORS,
                                borderRadius: 2, // Border radius of Label
                                borderWidth: 2, // Thickness of border
                                color: 'white',
                                stretch: 10,
                                padding: 0,
                                font: {
                                    resizable: true,
                                    minSize: 12,
                                    maxSize: 25,
                                    family: Chart.defaults.font.family,
                                    size: Chart.defaults.font.size,
                                    style: Chart.defaults.font.style,
                                    lineHeight: Chart.defaults.font.lineHeight,
                                },
                                zoomOutPercentage: 100,
                                textAlign: 'start',
                                backgroundColor: COLORS,
                              }
                        }
                    }
                });

                // using this to change color of csv-button if dark mode is chosen
                var background = $('body').css("background-color");

                if (background != ('rgb(255, 255, 255)')) {
                    $(".buttons-csv").css("color", "white");
                }
            } else {
                $('#continentContainer').html('<div class="alert alert-info" role="alert">Nothing found for the selected filters.</div>');
            }
}

function renderContinentsFromComponent() {
    var paramsElement = document.getElementById('continentParams');
    if (!paramsElement) {
        return;
    }

    var mode = paramsElement.dataset.mode || '';
    var band = paramsElement.dataset.band || '';

    continentsRender(mode, band);
}

document.body.addEventListener('htmx:afterSwap', function (event) {
    var target = event.detail && event.detail.target ? event.detail.target : event.target;
    if (target && target.id === 'continentResults') {
        renderContinentsFromComponent();
    }
});

$(document).ready(function () {
    // Render immediately if the results component is already present.
    renderContinentsFromComponent();

    $(document).on('click', '#resetButton', function () {
        var form = document.getElementById('continentFiltersForm');
        if (!form) {
            return;
        }

        form.reset();

        if (window.htmx) {
            htmx.trigger(form, 'submit');
        }
    });
});