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/**
 * @namespace WPGMZA
 * @module LatLngBounds
 * @requires WPGMZA
 */
jQuery(function($) {
	
	/**
	 * This class represents latitude and longitude bounds as a rectangular area.
	 * NB: This class is not fully implemented
	 * @class WPGMZA.LatLngBounds
	 * @constructor WPGMZA.LatLngBounds
	 * @memberof WPGMZA
	 */
	WPGMZA.LatLngBounds = function(southWest, northEast)
	{
		//console.log("Created bounds", southWest, northEast);
		
		if(southWest instanceof WPGMZA.LatLngBounds)
		{
			var other = southWest;
			this.south = other.south;
			this.north = other.north;
			this.west = other.west;
			this.east = other.east;
		}
		else if(southWest && northEast)
		{
			// TODO: Add checks and errors
			this.south = southWest.lat;
			this.north = northEast.lat;
			this.west = southWest.lng;
			this.east = northEast.lng;
		}
	}
	
	WPGMZA.LatLngBounds.fromGoogleLatLngBounds = function(googleLatLngBounds)
	{
		if(!(googleLatLngBounds instanceof google.maps.LatLngBounds))
			throw new Error("Argument must be an instance of google.maps.LatLngBounds");
		
		var result = new WPGMZA.LatLngBounds();
		var southWest = googleLatLngBounds.getSouthWest();
		var northEast = googleLatLngBounds.getNorthEast();
		
		result.north = northEast.lat();
		result.south = southWest.lat();
		result.west = southWest.lng();
		result.east = northEast.lng();
		
		return result;
	}
	
	WPGMZA.LatLngBounds.fromGoogleLatLngBoundsLiteral = function(obj)
	{
		var result = new WPGMZA.LatLngBounds();
		
		var southWest = obj.southwest;
		var northEast = obj.northeast;
		
		result.north = northEast.lat;
		result.south = southWest.lat;
		result.west = southWest.lng;
		result.east = northEast.lng;
		
		return result;
	}
	
	/**
	 * Returns true if this object is in it's initial state (eg no points specified to gather bounds from)
	 * @method
	 * @memberof WPGMZA.LatLngBounds
	 * @return {bool} True if the object is in it's initial state
	 */
	WPGMZA.LatLngBounds.prototype.isInInitialState = function()
	{
		return (this.north == undefined && this.south == undefined && this.west == undefined && this.east == undefined);
	}
	
	/**
	 * Extends this bounds object to encompass the given latitude and longitude coordinates
	 * @method
	 * @memberof WPGMZA.LatLngBounds
	 * @param {object|WPGMZA.LatLng} latLng either a LatLng literal or an instance of WPGMZA.LatLng
	 */
	WPGMZA.LatLngBounds.prototype.extend = function(latLng)
	{
		if(!(latLng instanceof WPGMZA.LatLng))
			latLng = new WPGMZA.LatLng(latLng);
		
		//console.log("Expanding bounds to " + latLng.toString());
		
		if(this.isInInitialState())
		{
			this.north = this.south = latLng.lat;
			this.west = this.east = latLng.lng;
			return;
		}
		
		if(latLng.lat < this.north)
			this.north = latLng.lat;
		
		if(latLng.lat > this.south)
			this.south = latLng.lat;
		
		if(latLng.lng < this.west)
			this.west = latLng.lng;
		
		if(latLng.lng > this.east)
			this.east = latLng.lng;
	}
	
	WPGMZA.LatLngBounds.prototype.extendByPixelMargin = function(map, x, arg)
	{
		var y = x;
		
		if(!(map instanceof WPGMZA.Map))
			throw new Error("First argument must be an instance of WPGMZA.Map");
		
		if(this.isInInitialState())
			throw new Error("Cannot extend by pixels in initial state");
		
		if(arguments.length >= 3)
			y = arg;
		
		var southWest = new WPGMZA.LatLng(this.south, this.west);
		var northEast = new WPGMZA.LatLng(this.north, this.east);
		
		southWest = map.latLngToPixels(southWest);
		northEast = map.latLngToPixels(northEast);
		
		southWest.x -= x;
		southWest.y += y;
		
		northEast.x += x;
		northEast.y -= y;
		
		southWest = map.pixelsToLatLng(southWest.x, southWest.y);
		northEast = map.pixelsToLatLng(northEast.x, northEast.y);
		
		var temp = this.toString();
		
		this.north = northEast.lat;
		this.south = southWest.lat;
		this.west = southWest.lng;
		this.east = northEast.lng;
		
		// console.log("Extended", temp, "to", this.toString());
	}
	
	WPGMZA.LatLngBounds.prototype.contains = function(latLng)
	{
		//console.log("Checking if latLng ", latLng, " is within bounds " + this.toString());
		
		if(!(latLng instanceof WPGMZA.LatLng))
			throw new Error("Argument must be an instance of WPGMZA.LatLng");
		
		if(latLng.lat < Math.min(this.north, this.south))
			return false;
		
		if(latLng.lat > Math.max(this.north, this.south))
			return false;
		
		if(this.west < this.east)
			return (latLng.lng >= this.west && latLng.lng <= this.east);
		
		return (latLng.lng <= this.west || latLng.lng >= this.east);
	}
	
	WPGMZA.LatLngBounds.prototype.toString = function()
	{
		return this.north + "N " + this.south + "S " + this.west + "W " + this.east + "E";
	}
	
	WPGMZA.LatLngBounds.prototype.toLiteral = function()
	{
		return {
			north: this.north,
			south: this.south,
			west: this.west,
			east: this.east
		};
	}
	
});