// google maps skript pro načtení pointů z XML zdroje
$(document).ready(function() {
    preloadImages();
    initializeGMaps();
});

function preloadImages() {
    if (!document.images) {
        return;
    }

    var image = null;

    for (var key in icons) {
        var icon = icons[key];

        image = new Image(10, 10);
        image.src = icon;
    }

    image = new Image(10, 10);
    image.src = "/img/icon-close.gif";
}

// pole všech značek
var global_markers = new Array();
// pole ikonek
var icons = new Array();
// mapa
var map;
// hranice pro zobrazeni mapy
var bounds;

var infoWindow;

 
// vytvoříme typy značek
icons["type1"] = "/img/map/ico-devel.png";
icons["type2"] = "/img/map/ico-devel-disabled.png";

icons["sale"] = "/img/map/ico-sale.png";
icons["disabled"] = "/img/map/ico-disabled.png";

icons["cheap"] = "/img/icons/cheap-small.png";
icons["design"] = "/img/icons/design-small.png";
icons["ecology"] = "/img/icons/ecology-small.png";
icons["video"] = "/img/icons/video-small.png";

icons["dream"] = "/img/dream/pin-red.png";

// Inicializace mapy
function initializeGMaps() {
    // určení DIVu, který obsahuje mapu
    basePoint = new google.maps.LatLng(49.74799973900054, 15.38134765625);
    

    var myOptions = {
        zoom: 7,
        center: basePoint,
        panControl: true,
        zoomControl: true,        
        zoomControlOptions : {
            style: google.maps.ZoomControlStyle.LARGE
        },
        mapTypeControl: true,
        scaleControl: true,
        streetViewControl: true,
        mapTypeId: google.maps.MapTypeId.ROADMAP,
        scrollwheel: false
    };
    
    var mapDiv = document.getElementById("results-map-inner");
    map = new google.maps.Map(mapDiv, myOptions);

    // Overwrite the getMinimumResolution() and getMaximumResolution() methods
    google.maps.event.addListener(map, "zoom_changed", function() {
        if (map.getZoom() < 7) {
            map.setZoom(7);
        }
    });

    // vytvorime prazdny objekt pro definici hranic zobrazeni
    bounds = new google.maps.LatLngBounds();


    downloadMap("/hledani/json-export", mergeDownloads);
    downloadMap("/hledani/json-export-dream", mergeDownloads);


    // listener pro nahrani nemovitosti dle aktualniho vyrezu mapy
    google.maps.event.addListener(map, "dragend", function() {
        synchronizeMap();
        if ( typeof updateElements == "function") {
            updateElements();
        }
    });

    google.maps.event.addListener(map, "zoomend", function() {
        synchronizeMap();
        if ( typeof updateElements == "function") {
            updateElements();
        }
    });
}

var downloadCount = 0;

function mergeDownloads() {
    downloadCount++;
    
    if (downloadCount == 2) {
        setBoundsByMarkers();
    }
}


function synchronizeMap() {
    var span = map.getBounds().toSpan();
    var center = map.getBounds().getCenter();
    var zoom = map.getZoom();

    if (zoom >= 11) {
        var url = "/hledani/synchronize?lat=" + center.lat() +
        "&lng=" + center.lng() +
        "&accuracy=" + span.lat()
        ;

        downloadMap(url);
    }
}


function downloadMap(url, callback) {
    // build map icons from json
    $.get(url, {}, function(data, responseCode) {
        if (!data) {
            return;
        }
        
        var s;
        var points = data.points;
        
        // for přes všechny body v XML souboru
        for (var i = 0; i < points.length; i++) {
            // pokud je jiz marker v poli, tak jej neni potreba pridavat
            if (global_markers[points[i].id]) {
                continue;
            }

            // souřadnice bodu
            var point = new google.maps.LatLng(parseFloat(points[i].lng), parseFloat(points[i].lat));

            // vytvoreni obsahu
            s = createContent(points[i]);

            // vytvoření značky
            var marker_id = points[i].id;

            if (!global_markers[marker_id]) {
                var marker = createMarker(point, s, points[i].label, points[i].icon);

                // přidání značky do globálního pole
                global_markers[marker_id] = marker;
            }
        }
        
        if (typeof callback == "function") {
            callback();
        }

    }, "json");

}

function setBoundsByMarkers() {
    //var innerHtml = "Vašemu vyhledávání neodpovídá žádná nabídka.<br /><br />";
    bounds = new google.maps.LatLngBounds();
    
    if (global_markers.length == null) { 
        basePoint1 = new google.maps.LatLng(51.39372189194996, 12.579345703125);
        basePoint2 = new google.maps.LatLng(48.050178768479675, 17.6220703125);
        bounds.extend(basePoint1);
        bounds.extend(basePoint2);
    }
    
    for (var key in global_markers) {
        var marker = global_markers[key];
        
        bounds.extend(marker.getPosition());
    }
    
    GM_setViewport(bounds, function() {
        map.setZoom(map.getZoom() - 1);
    }, 15);
}

/**
 * Fixes API problems.
 *
 */
function GM_setViewport(bounds, callback, maxZoom) {
    var desiredSpan = bounds.toSpan();

    map.fitBounds(bounds);

    google.maps.event.addListenerOnce(map, "bounds_changed", function() {
        //createMarker(bounds.getSouthWest(), "SW" + asdf, "SW" + asdf, "type1");
        //createMarker(bounds.getNorthEast(), "NE" + asdf, "NE" + asdf, "type1");

        var iter = 0;

        //map.setZoom(map.getZoom() + 1);
        // GM bugfix
        while (true) {
            if (map.getBounds() == null) {
                break;
            }
            
            if (iter > 10) {
                break;
            }
            
            var newSpan = map.getBounds().toSpan();
            var errorLat = Math.round(Math.abs(newSpan.lat() / desiredSpan.lat()));
            var errorLng = Math.round(Math.abs(newSpan.lng() / desiredSpan.lng()));
            var error = Math.min(errorLat, errorLng);

            //alert(errorLat + " vs " + errorLng + " => " + error);

            if (error >= 2) { // too large
                if (maxZoom && map.getZoom() >= maxZoom) {
                    break;
                }
                map.setZoom(map.getZoom() + 1); // zoom in
            } else if (error == 0) {
                map.setZoom(map.getZoom() - 1); // zoom out
            } else {
                break;
            }
            
            iter++;
        }
        
        if (maxZoom && map.getZoom() > maxZoom) {
            map.setZoom(maxZoom);
        }

        if (typeof callback == "function") {
            callback();
        }
    });
}


function infoClick(i) {
    google.maps.event.trigger(global_markers[i], "click");
    //map.setZoom(15);
}


function createContent(point) {
    // html obsah informačního okna, které se zobrazi
    s = "<table width='300' cellspacing='5'><tr valign='top'>";

    // test if image exists
    if (point.img) {
        s = s + "<td width='90'>";
        if (point.paid > 0) {
            s = s + "<a href='" + point.url + "'>";
                s = s + "<img style='padding: 2px; border: 1px solid #aeaeae;' src='" + point.img + "' width='" + point.size_x + "' height='" + point.size_y + "' />";
            s = s + "</a>";
        } else {
            s = s + "<img style='padding: 2px; border: 1px solid #aeaeae;' src='" + point.img + "' width='" + point.size_x + "' height='" + point.size_y + "' />";
        }
        s = s + "</td>";
    }

    s = s + "<td>";

    // test if url exists
    if (point.paid > 0) {
        s = s + "<a href='" + point.url + "' class='nazev'><strong>" + point.name + "</strong></a><br />";
    } else {
        s = s + "<strong>" + point.name + "</strong><br />";
    }

    s = s + point.label.replace(/<sup>2<\/sup>,/, '<sup>2</sup>,<br/>') + "<br />";

    if (point.paid > 0) {
        s = s + "<a href='" + point.url + "' >Detail projektu &raquo;</a><br />";
    }

    if (point.cheap > 0) {
        s = s + "<img style='padding: 4px;' src='" + icons["cheap"] + "' width='11' height='20' align='middle' alt='Levné bydlení' title='Levné bydlení' />";
    }

    if (point.design > 0) {
        s = s + "<img style='padding: 4px;' src='" + icons["design"] + "' width='13' height='20' align='middle' alt='Designové bydlení' title='Designové bydlení' />";
    }

    if (point.ecology > 0) {
        s = s + "<img style='padding: 4px;' src='" + icons["ecology"] + "' width='19' height='20' align='middle' alt='Eko bydlení' title='Eko bydlení' />";
    }

    if (point.video > 0) {
        s = s + "<img style='padding: 4px;' src='" + icons["video"] + "' width='22' height='20' align='middle' alt='Video' title='Video' />";
    }

    s = s + "</td></tr></table>";

    s = s + "<div class='clr'></div>"

    return s;
}


// Vytvoří značku, parametry: souřadnice značky, html kód okna, popiska značky, ikona značky
function createMarker(point, content, cap, icon_type) {
     /* create marker */
    var size = new google.maps.Size(25, 31);
    var icon = new google.maps.MarkerImage(icons[icon_type], size);

    var markerOpts = {
        position: point,
        draggable: false,
        title: cap,
        icon: icon,
        maxWidth: 400
    };
    var marker = new google.maps.Marker(markerOpts);
    marker.setMap(map);

    google.maps.event.addListener(marker, "click", function() {
        createInfoWindow(content, marker);
        map.panTo(point);
        //map.setZoom(12);
    });

    return marker;
}

function createInfoWindow(string, marker) {
    if (infoWindow) {
        infoWindow.close();
        infoWindow = null;
    }
    infoWindow = new google.maps.InfoWindow({
        content: string
    });

    infoWindow.open(map, marker);

    return infoWindow;
}

function GM_recenter() {
    map.setCenter(bounds.getCenter());
}

function GM_checkResize() {
    google.maps.event.trigger(map, 'resize');
}