// How often to query the server?
const REFRESH_INTERVAL_SEC = 60 * 10;

// Storage for the alert data that the server gives us.
var alerts = []

// Load alerts and populate the table.
function loadAlerts() {
    $.getJSON('/api/v1/alerts' + buildQueryString(), function(jsonData) {
        // Store last updated time
        lastUpdateTime = moment.utc();
        updateRefreshDisplay();
        // Store data
        alerts = jsonData;
        // Update table
        updateTable();
    });
}

// Build a query string for the API, based on the filters that the user has selected.
function buildQueryString() {
    var str =  "?";
    ["dx_continent", "source"].forEach(fn => {
        if (!allFilterOptionsSelected(fn)) {
            str = str + getQueryStringFor(fn) + "&";
        }
    });
    str = str + "limit=" + $("#alerts-to-fetch option:selected").val();
    var maxDur = $("#max-duration option:selected").val();
    if (maxDur != "9999999999") {
        str = str + "&max_duration=" + maxDur;
    }
    if ($("#dxpeditions_skip_max_duration_check")[0].checked) {
        str = str + "&dxpeditions_skip_max_duration_check=true";
    }
    return str;
}

// Update the alerts table
function updateTable() {
    // Use local time instead of UTC?
    var useLocalTime = $("#timeZone")[0].value == "local";

    // Table data toggles
    var showStartTime = $("#tableShowStartTime")[0].checked;
    var showEndTime = $("#tableShowEndTime")[0].checked;
    var showDX = $("#tableShowDX")[0].checked;
    var showFreqsModes = $("#tableShowFreqsModes")[0].checked;
    var showComment = $("#tableShowComment")[0].checked;
    var showSource = $("#tableShowSource")[0].checked;
    var showRef = $("#tableShowRef")[0].checked;

    // Populate table with headers
    let table = $("#table");
    table.find('thead tr').empty();
    if (showStartTime) {
        table.find('thead tr').append(`<th>${useLocalTime ? "Start&nbsp;(Local)" : "Start&nbsp;UTC"}</th>`);
    }
    if (showEndTime) {
        table.find('thead tr').append(`<th>${useLocalTime ? "End&nbsp;(Local)" : "End&nbsp;UTC"}</th>`);
    }
    if (showDX) {
        table.find('thead tr').append(`<th>DX</th>`);
    }
    if (showFreqsModes) {
        table.find('thead tr').append(`<th class='hideonmobile'>Freq<span class='hideonmobile'>uencie</span>s & Modes</th>`);
    }
    if (showComment) {
        table.find('thead tr').append(`<th class='hideonmobile'>Comment</th>`);
    }
    if (showSource) {
        table.find('thead tr').append(`<th class='hideonmobile'>Source</th>`);
    }
    if (showRef) {
        table.find('thead tr').append(`<th class='hideonmobile'>Ref.</th>`);
    }

    table.find('tbody').empty();

    // Split alerts into three types, each of which will get its own table header: On now, next 24h, and later. "On now"
    // is considered to be events with an end_time where start<now<end, or events with no end time that started in the
    // last hour.
    onNow = alerts.filter(a => (a["end_time"] != null && a["end_time"] != 0 && moment.unix(a["end_time"]).utc().isSameOrAfter() && moment.unix(a["start_time"]).utc().isBefore())
        || ((a["end_time"] == null || a["end_time"] == 0) && moment.unix(a["start_time"]).utc().add(1, 'hours').isSameOrAfter() && moment.unix(a["start_time"]).utc().isBefore()));
    next24h = alerts.filter(a => moment.unix(a["start_time"]).utc().isSameOrAfter() && moment.unix(a["start_time"]).utc().subtract(24, 'hours').isBefore());
    later = alerts.filter(a => moment.unix(a["start_time"]).utc().subtract(24, 'hours').isSameOrAfter());

    if (onNow.length > 0) {
        table.find('tbody').append('<tr class="table-primary"><td colspan="100" style="text-align:center;">On Now</td></tr>');
        addAlertRowsToTable(table.find('tbody'), onNow);
    }

    if (next24h.length > 0) {
        table.find('tbody').append('<tr class="table-primary"><td colspan="100" style="text-align:center;">Starting within 24 hours</td></tr>');
        addAlertRowsToTable(table.find('tbody'), next24h);
    }

    if (later.length > 0) {
        table.find('tbody').append('<tr class="table-primary"><td colspan="100" style="text-align:center;">Starting later </td></tr>');
        addAlertRowsToTable(table.find('tbody'), later);
    }

    if (onNow.length == 0 && next24h.length == 0 && later.length == 0) {
        table.find('tbody').append('<tr class="table-danger"><td colspan="100" style="text-align:center;">No alerts match your filters.</td></tr>');
    }
}

// Add a row to tbody for each alert in the provided list
function addAlertRowsToTable(tbody, alerts) {
    var count = 0;
    alerts.forEach(a => {
        // Create row
        let $tr = $('<tr>');

        // Apply striping to the table. We can't just use Bootstrap's table-striped class because we have all sorts of
        // extra faff to deal with, like the mobile view having extra rows, and the On Now / Next 24h / Later banners
        // which cause the table-striped colouring to go awry.
        if (count % 2 == 1) {
            $tr.addClass("table-active");
        }

        // Use local time instead of UTC?
        var useLocalTime = $("#timeZone")[0].value == "local";

        // Table data toggles
        var showStartTime = $("#tableShowStartTime")[0].checked;
        var showEndTime = $("#tableShowEndTime")[0].checked;
        var showDX = $("#tableShowDX")[0].checked;
        var showFreqsModes = $("#tableShowFreqsModes")[0].checked;
        var showComment = $("#tableShowComment")[0].checked;
        var showSource = $("#tableShowSource")[0].checked;
        var showRef = $("#tableShowRef")[0].checked;

        // Get times for the alert, and convert to local time if necessary.
        var start_time_utc = moment.unix(a["start_time"]).utc();
        var start_time_local = start_time_utc.clone().local();
        start_time = useLocalTime ? start_time_local : start_time_utc;
        var end_time_utc = moment.unix(a["end_time"]).utc();
        var end_time_local = end_time_utc.clone().local();
        end_time = useLocalTime ? end_time_local : end_time_utc;

        // Format the times for display. Start time is displayed as e.g. 7 Oct 12:34 unless the time is in a
        // different year to the current year, in which case the year is inserted between month and hour.
        // If the time is set to local not UTC, and the date in local time is "today", we display that instead.
        // End time is displayed the same as above, except if the end date is the same as the start date, in which case
        // just e.g. 23:45 is used.
        // Overriding all of that, if the start time is 00:00 and the end time is 23:59 when considered in UTC, the
        // hours and minutes are stripped out from the display, as we assume the server is just giving us full days.
        // Finally, if there is no end date set, "---" is displayed.
        var whole_days = start_time_utc.format("HH:mm") == "00:00" &&
            (end_time_utc != null || end_time_utc > 0 || end_time_utc.format("HH:mm") == "23:59");
        var hours_minutes_format = whole_days ? "" : " HH:mm";
        var start_time_formatted = start_time.format("D MMM" + hours_minutes_format);
        if (start_time.format("YYYY") != moment().format("YYYY")) {
            start_time_formatted = start_time.format("D MMM YYYY" + hours_minutes_format);
        } else if (useLocalTime && start_time.format("D MMM YYYY") == moment().format("D MMM YYYY")) {
            start_time_formatted = start_time.format("[Today]" + hours_minutes_format);
        }
        var end_time_formatted = "---";
        if (end_time_utc != null && end_time_utc > 0 && end_time != null) {
            var end_time_formatted = whole_days ? start_time_formatted : end_time.format("HH:mm");
            if (end_time.format("D MMM") != start_time.format("D MMM")) {
                if (end_time.format("YYYY") != moment().format("YYYY")) {
                    end_time_formatted = end_time.format("D MMM YYYY" + hours_minutes_format);
                } else if (useLocalTime && end_time.format("D MMM YYYY") == moment().format("D MMM YYYY")) {
                    end_time_formatted = end_time.format("[Today]" + hours_minutes_format);
                } else {
                    end_time_formatted = end_time.format("D MMM" + hours_minutes_format);
                }
            }
        }

        // Format dx country
        var dx_country = a["dx_country"]
        if (dx_country == null) {
            dx_country = "Unknown or not a country"
        }

        // Format DX flag
        var dx_flag = "<i class='fa-solid fa-globe-africa'></i>";
        if (a["dx_dxcc_id"] && a["dx_dxcc_id"] != null && a["dx_dxcc_id"] != 0) {
            dx_flag = `<img src="img/flags/${a['dx_dxcc_id']}.png" class="flag" width="24" alt="${dx_country}" title="${dx_country}"/>`;
        }

        // Format dx calls
        var dx_calls_html = "";
        if (a["dx_calls"] != null) {
            dx_calls_html = a["dx_calls"].map(call => `<a class='dx-link' href='https://qrz.com/db/${call}' target='_new'>${call}</a>`).join(", ");
        }

        // Format DXpedition country
        var dx_country_html = "";
        if (a["is_dxpedition"] == true && a["dx_country"] != null && a["dx_country"] != "") {
            dx_country_html = `<br/>${a["dx_country"]}`;
        }

        // Format freqs & modes
        var freqsModesText = "";
        if (a["freqs_modes"] != null) {
            freqsModesText = escapeHtml(a["freqs_modes"]);
        }

        // Format comment
        var commentText = "";
        if (a["comment"] != null) {
            commentText = escapeHtml(a["comment"]);
        }

        // Sig or fallback to source
        var sigSourceText = a["source"];
        if (a["sig"]) {
            sigSourceText = a["sig"];
        }

        // Format sig_refs
        var sig_refs = "";
        if (a["sig_refs"] != null) {
            var items = []
            for (var i = 0; i < a["sig_refs"].length; i++) {
                if (a["sig_refs"][i]["url"] != null) {
                    items[i] = `<a href='${a["sig_refs"][i]["url"]}' title='${a["sig_refs"][i]["name"]}' target='_new' class='sig-ref-link'>${a["sig_refs"][i]["id"]}</a>`
                } else {
                    items[i] = `${a["sig_refs"][i]["id"]}`
                }
            }
            sig_refs = items.join(", ");
        }

        // Populate the row
        if (showStartTime) {
            $tr.append(`<td class='nowrap'>${start_time_formatted}</td>`);
        }
        if (showEndTime) {
            $tr.append(`<td class='nowrap'>${end_time_formatted}</td>`);
        }
        if (showDX) {
            $tr.append(`<td class='nowrap'><span class='flag-wrapper hideonmobile' title='${dx_country}'>${dx_flag}</span>${dx_calls_html}${dx_country_html}</td>`);
        }
        if (showFreqsModes) {
            $tr.append(`<td class='hideonmobile'>${freqsModesText}</td>`);
        }
        if (showComment) {
            $tr.append(`<td class='hideonmobile'>${commentText}</td>`);
        }
        if (showSource) {
            $tr.append(`<td class='nowrap hideonmobile'><span class='icon-wrapper'><i class='fa-solid ${sigToIcon(a["sig"], "fa-globe-africa")}'></i></span> ${sigSourceText}</td>`);
        }
        if (showRef) {
            $tr.append(`<td class='hideonmobile'>${sig_refs}</td>`);
        }
        tbody.append($tr);

        // Second row for mobile view only, containing source, ref, freqs/modes & comment
        $tr2 = $("<tr class='hidenotonmobile'>");
        if (count % 2 == 1) {
            $tr2.addClass("table-active");
        }
        $td2 = $("<td colspan='100'>");
        if (showSource) {
            $td2.append(`<span class='icon-wrapper'><i class='fa-solid ${sigToIcon(a["sig"], "fa-globe-africa")}'></i></span> `);
        }
        if (showRef) {
            $td2.append(`${sig_refs} `);
        }
        if (showFreqsModes) {
            $td2.append(`${freqsModesText} `);
        }
        if (showComment) {
            $td2.append(`<br/>${commentText} `);
        }
        $tr2.append($td2);
        tbody.append($tr2);

        count++;
    });
}

// Load server options. Once a successful callback is made from this, we then query alerts.
function loadOptions() {
    $.getJSON('/api/v1/options', function(jsonData) {
        // Store options
        options = jsonData;

        // Populate the filters panel
        generateMultiToggleFilterCard("#dx-continent-options", "dx_continent", options["continents"]);
        generateMultiToggleFilterCard("#source-options", "source", options["alert_sources"]);

        // Populate the Display panel
        options["web-ui-options"]["alert-count"].forEach(sc => $("#alerts-to-fetch").append($('<option>', {
            value: sc,
            text: sc
        })));
        $("#alerts-to-fetch").val(options["web-ui-options"]["alert-count-default"]);

        // Load URL params. These may select things from the various filter & display options, so the function needs
        // to be called after these are set up, but if the URL params ask for "embedded mode", this will suppress
        // loading settings, so this needs to be called before that.
        loadURLParams();

        // Load filters from settings storage
        loadSettings();

        // Load alerts and set up the timer
        loadAlerts();
        setInterval(loadAlerts, REFRESH_INTERVAL_SEC * 1000);
    });
}

// Method called when any filter is changed to reload the alerts and persist the filter settings.
function filtersUpdated() {
    loadAlerts();
    saveSettings();
}

// Function to set dark mode based on the state of the UI toggle in spots, bands and map pages
function toggleDarkMode() {
    enableDarkMode($("#darkMode")[0].checked);
    saveSettings();
}

// React to toggling/closing panels
function toggleFiltersPanel() {
    // If we are going to display the filters panel, hide the display panel
    if (!$("#filters-area").is(":visible") && $("#display-area").is(":visible")) {
        $("#display-area").hide();
        $("#display-button").button("toggle");
    }
    $("#filters-area").toggle();
}
function closeFiltersPanel() {
    $("#filters-button").button("toggle");
    $("#filters-area").hide();
}

function toggleDisplayPanel() {
    // If we are going to display status, load the data for the status panel, and hide the filters panel
    if (!$("#display-area").is(":visible") && $("#filters-area").is(":visible")) {
        $("#filters-area").hide();
        $("#filters-button").button("toggle");
    }
    $("#display-area").toggle();
}
function closeDisplayPanel() {
    $("#display-button").button("toggle");
    $("#display-area").hide();
}

// Startup
$(document).ready(function() {
    // Call loadOptions(), this will then trigger loading alerts and setting up timers.
    loadOptions();
    // Update the refresh timing display every second
    setInterval(updateRefreshDisplay, 1000);
});

// Reload alerts on becoming visible. This forces a refresh when used as a PWA and the user switches back to the PWA
// after some time has passed with it in the background.
addEventListener("visibilitychange", (event) => {
    if (!document.hidden) {
        loadAlerts();
    }
});