/******************************
Copyright (c) 2009, Avanade
All rights reserved.

Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met:

* Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer.

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LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 
******************************/

// Set these variables to change beginning map location
var beginLatitude = 43.75;
var beginLongitude = -83.9483;
var beginZoom = 10;

// Url for accessing data from database
var pinServiceUrl = "returnresults1.php";

// Global variable to initialize VEMap in
var map = null;
// Global variable to track current pinId
var pinid = 0;
// Should we render the map now or wait for call back
var waitingForCallback = false;

// locID is the location ID for the BCRC Locations
var locID=0;

// To hold values for call back function
var tmpTitle = null;
var tmpDescription = null;

// Initialize map
// mapDivName - Div container for map
function GetMap(mapDivName) {
    map = new VEMap(mapDivName);
    map.LoadMap(new VELatLong(beginLatitude, beginLongitude), beginZoom, 'h', false);
    map.SetZoomLevel(beginZoom);
    map.AttachEvent("onchangeview", MapChangeHandler);

    LoadPushPins();
}

// Add Pushpin at desired latitude & longitude
// Title - Title of Pushpin
// Description - Description to set on Pushpin
// latLon - VELatLong object of location to set PushPin
function AddPushpin(title, description, latLon, townshipNumber) {
    var shape = new VEShape(VEShapeType.Pushpin, latLon);
    shape.SetTitle(title);
    shape.SetDescription(description);
	//assign custom image for each location
	shape.SetCustomIcon("images/whiteDkred/" + townshipNumber + ".gif");
    pinid++;
    map.AddShape(shape);
}

// Try to find this location and add a pushpin if successfull
// Location - string value of location to add to map
function FindAndAddPin(title, description, location) {
    if(title == null || description == null || location == null || 
	   title.length == 0 || description.length == 0 || location.length == 0) {
	    alert('Title, Description & Location are all required fields');
    }
    else {
        try {
    	    tmpTitle = title;
    	    tmpDescription = description;
            map.Find(null, location,null,null,0,1,false,false,true,true,MapFindCallback);
            waitingForCallback = true;
        }
        catch (e) {
            alert(e.message);
            waitingForCallback = false; 
        }
    }
}

// Call back function for when a map location is found
function MapFindCallback(layer, resultsArray, places, hasMore, veErrorMessage)
{
	if(places != null)
	{
	    var latLon = places[0].LatLong;
	    
	    SavePushPin(tmpTitle, tmpDescription, latLon.Latitude, latLon.Longitude);
	    tmpTitle = null;
	    tmpDescription = null;
    }
}

// Repopulates maps with push pins on map change events
function MapChangeHandler(e) {
    if(!waitingForCallback)
    {
        LoadPushPins();
    }
}

// Load the current map with push pins
function LoadPushPins() {
    view = map.GetMapView();
    topleft = view.TopLeftLatLong;
    bottomright = view.BottomRightLatLong;
    
    $.getJSON(pinServiceUrl, { tlLat: topleft.Latitude, tlLong: topleft.Longitude, brLat: bottomright.Latitude , brLong: bottomright.Longitude}, GetPinsCallback);
}

// Call back from JSON getPins command.  Parse JSON response and adds pins to map.
function GetPinsCallback(jsonData) {
	map.Clear();
    $.each(jsonData, function(i, item) {
        // added townshipNumber to list of variables to pull
		AddPushpin(item.title, item.description, new VELatLong(item.latitude, item.longitude), item.townshipNumber);
    });
}

// Save the current push pin
function SavePushPin(title, description, latitude, longitude) {
    waitingForCallback = false; 

    $.post(pinServiceUrl, { title: title, description: description, latitude: latitude, longitude: longitude }, LoadPushPins);
}