(function ($) {
    'use strict';

    var DEFAULT_CENTER = [35.6892, 51.3890];
    var maps = {};
    var markers = {};

    function loadLeaflet(callback) {
        if (typeof L !== 'undefined') {
            callback();
            return;
        }

        var attempts = 0;
        var check = setInterval(function () {
            attempts++;
            if (typeof L !== 'undefined') {
                clearInterval(check);
                callback();
            } else if (attempts > 100) {
                clearInterval(check);
            }
        }, 50);
    }

    function parsePosition(val) {
        if (!val) {
            return null;
        }

        var parts = String(val).split(',');
        if (parts.length >= 2) {
            var lat = parseFloat(parts[0].trim());
            var lng = parseFloat(parts[1].trim());
            if (!isNaN(lat) && !isNaN(lng)) {
                return [lat, lng];
            }
        }

        return null;
    }

    function reverseGeocode(lat, lng, addressSelector) {
        var $field = $(addressSelector);
        if (!$field.length) {
            return;
        }

        $.getJSON(base_path + '/reverse-geocode/' + lat + ',' + lng, function (data) {
            if (data && data.address) {
                $field.val(data.address).trigger('change');
            }
        });
    }

    function createMap(mapId, $wrapper, addressSelector, positionField, fillAddress) {
        var initial = null;
        if (positionField) {
            initial = parsePosition($(positionField).val());
        }

        var center = initial || DEFAULT_CENTER;
        var zoom = initial ? 15 : 6;

        var map = L.map(mapId, { scrollWheelZoom: true }).setView(center, zoom);
        L.tileLayer('https://{s}.tile.openstreetmap.org/{z}/{x}/{y}.png', {
            maxZoom: 19,
            attribution: '&copy; <a href="https://www.openstreetmap.org/copyright">OpenStreetMap</a>'
        }).addTo(map);

        markers[mapId] = null;
        if (initial) {
            markers[mapId] = L.marker(initial).addTo(map);
        }

        map.on('click', function (e) {
            var lat = e.latlng.lat;
            var lng = e.latlng.lng;

            if (markers[mapId]) {
                markers[mapId].setLatLng(e.latlng);
            } else {
                markers[mapId] = L.marker(e.latlng).addTo(map);
            }

            if (positionField) {
                $(positionField).val(lat + ',' + lng);
            }

            if (fillAddress && addressSelector) {
                reverseGeocode(lat, lng, addressSelector);
            }

            $wrapper.find('.osm-map-toggle').addClass('btn-info');
        });

        if (navigator.geolocation && !initial) {
            navigator.geolocation.getCurrentPosition(function (position) {
                map.setView([position.coords.latitude, position.coords.longitude], 12);
            });
        }

        maps[mapId] = map;

        setTimeout(function () {
            map.invalidateSize();
        }, 250);
    }

    function initWrapper($wrapper) {
        if ($wrapper.data('osm-initialized')) {
            return;
        }
        $wrapper.data('osm-initialized', true);

        var mapId = $wrapper.data('map-id');
        var addressSelector = $wrapper.data('address-selector');
        var positionField = $wrapper.data('position-field');
        var fillAddress = $wrapper.data('fill-address') !== 0 && $wrapper.data('fill-address') !== '0';
        var $container = $('#' + mapId);
        var $toggle = $wrapper.find('.osm-map-toggle');

        if (positionField && $(positionField).val()) {
            $toggle.addClass('btn-info');
        }

        $toggle.on('click', function () {
            if ($container.is(':visible')) {
                $container.slideUp();
                return;
            }

            $container.slideDown(function () {
                loadLeaflet(function () {
                    if (!maps[mapId]) {
                        createMap(mapId, $wrapper, addressSelector, positionField, fillAddress);
                    } else {
                        maps[mapId].invalidateSize();
                    }
                });
            });
        });
    }

    function scan(root) {
        $(root || document).find('.osm-address-map-wrapper').each(function () {
            initWrapper($(this));
        });
    }

    $(document).ready(function () {
        scan();
    });

    $(document).on('shown.bs.modal', function (e) {
        scan(e.target);
    });

    window.OsmAddressMap = {
        scan: scan,
        invalidate: function (mapId) {
            if (maps[mapId]) {
                maps[mapId].invalidateSize();
            }
        }
    };
})(jQuery);