function getConfigHasSeenInfoModal() {
    return localStorage.getItem("config_has_seen_info_modal") === "true";
}

function setConfigHasSeenInfoModal(value) {
    return localStorage.setItem("config_has_seen_info_modal", value);
}

function getConfigAutoUpdatePositionInUrl() {
    // use user preference, or enable by default
    const value = localStorage.getItem("config_auto_update_position_in_url");
    return value === "true" || value == null;
}

function setConfigAutoUpdatePositionInUrl(value) {
    return localStorage.setItem("config_auto_update_position_in_url", value);
}

function getConfigEnableMapAnimations() {

    const value = localStorage.getItem("config_enable_map_animations");

    // enable animations by default
    if(value === null){
        return true;
    }

    return value === "true";

}

function setConfigEnableMapAnimations(value) {
    return localStorage.setItem("config_enable_map_animations", value);
}

function getConfigTemperatureFormat() {
    return localStorage.getItem("config_temperature_format") || "celsius";
}

function setConfigTemperatureFormat(format) {
    return localStorage.setItem("config_temperature_format", format);
}

function getConfigMapSelectedTileLayer() {
    return localStorage.getItem("config_map_selected_tile_layer") || "Thunderforest Neighbourhood";
}

function setConfigMapSelectedTileLayer(layer) {
    return localStorage.setItem("config_map_selected_tile_layer", layer);
}

function getConfigMapEnabledOverlayLayers() {

    try {
        const value = localStorage.getItem("config_map_enabled_overlay_layers");
        if(value){
            return JSON.parse(value);
        }
    } catch(e) {}

    // overlays enabled by default
    return ["Legend", "Position History", "Traceroutes"];

}

function setConfigMapEnabledOverlayLayers(layers) {
    return localStorage.setItem("config_map_enabled_overlay_layers", JSON.stringify(layers));
}

function getConfigNodesMaxAgeInSeconds() {
    const value = localStorage.getItem("config_nodes_max_age_in_seconds");
    return value != null ? parseInt(value) : null;
}

function setConfigNodesMaxAgeInSeconds(value) {
    if(value != null){
        return localStorage.setItem("config_nodes_max_age_in_seconds", value);
    } else {
        return localStorage.removeItem("config_nodes_max_age_in_seconds");
    }
}

function getConfigNodesOfflineAgeInSeconds() {
    const value = localStorage.getItem("config_nodes_offline_age_in_seconds");
    return value != null ? parseInt(value) : 10800;
}

function setConfigNodesOfflineAgeInSeconds(value) {
    if(value != null){
        return localStorage.setItem("config_nodes_offline_age_in_seconds", value);
    } else {
        return localStorage.removeItem("config_nodes_offline_age_in_seconds");
    }
}

function getConfigWaypointsMaxAgeInSeconds() {
    const value = localStorage.getItem("config_waypoints_max_age_in_seconds");
    return value != null ? parseInt(value) : null;
}

function setConfigWaypointsMaxAgeInSeconds(value) {
    if(value != null){
        return localStorage.setItem("config_waypoints_max_age_in_seconds", value);
    } else {
        return localStorage.removeItem("config_waypoints_max_age_in_seconds");
    }
}

function getConfigConnectionsMaxDistanceInMeters() {
    const value = localStorage.getItem("config_connections_max_distance_in_meters");
    // default to 70km (70,000 meters)
    return value != null ? parseInt(value) : 70000;
}

function setConfigConnectionsMaxDistanceInMeters(value) {
    return localStorage.setItem("config_connections_max_distance_in_meters", value);
}

function getConfigZoomLevelGoToNode() {
    const value = localStorage.getItem("config_zoom_level_go_to_node");
    const parsedValue = value != null ? parseInt(value) : null;
    return parsedValue || 15;
}

function setConfigZoomLevelGoToNode(value) {
    return localStorage.setItem("config_zoom_level_go_to_node", value);
}

function getConfigConnectionsTimePeriodInSeconds() {
    const value = localStorage.getItem("config_connections_time_period_in_seconds");
    // default to 7 days if unset
    return value != null ? parseInt(value) : 604800;
}

function setConfigConnectionsTimePeriodInSeconds(value) {
    return localStorage.setItem("config_connections_time_period_in_seconds", value);
}

function getConfigConnectionsColoredLines() {
    const value = localStorage.getItem("config_connections_colored_lines");
    // disable colored lines by default
    if(value === null){
        return false;
    }
    return value === "true";
}

function setConfigConnectionsColoredLines(value) {
    return localStorage.setItem("config_connections_colored_lines", value);
}

function getConfigConnectionsBidirectionalOnly() {
    const value = localStorage.getItem("config_connections_bidirectional_only");
    // disable bidirectional filter by default
    if(value === null){
        return false;
    }
    return value === "true";
}

function setConfigConnectionsBidirectionalOnly(value) {
    return localStorage.setItem("config_connections_bidirectional_only", value);
}

function getConfigConnectionsMinSnrDb() {
    const value = localStorage.getItem("config_connections_min_snr_db");
    // default to null (unset)
    if(value === null || value === ""){
        return null;
    }
    const parsed = parseFloat(value);
    return isNaN(parsed) ? null : parsed;
}

function setConfigConnectionsMinSnrDb(value) {
    if(value === null || value === "" || value === undefined){
        return localStorage.removeItem("config_connections_min_snr_db");
    }
    // Convert to string for localStorage (handles both number and string inputs)
    const stringValue = typeof value === "number" ? value.toString() : String(value);
    return localStorage.setItem("config_connections_min_snr_db", stringValue);
}

function getConfigConnectionsBidirectionalMinSnr() {
    const value = localStorage.getItem("config_connections_bidirectional_min_snr");
    // disable bidirectional minimum SNR by default
    if(value === null){
        return false;
    }
    return value === "true";
}

function setConfigConnectionsBidirectionalMinSnr(value) {
    return localStorage.setItem("config_connections_bidirectional_min_snr", value);
}

function isMobile() {
    return /Android|webOS|iPhone|iPad|iPod|BlackBerry|IEMobile|Opera Mini/i.test(navigator.userAgent);
}