// Variable for the currently selected flag ratio
var currentRatio = null;

var aspectRatios = null;
var aspectMaxRatio = 0;

function calcMaxRatio(aspect_ratio_data)
{
    // work out the maximum ratio      
    var max_ratio = 0;

    $.each(aspect_ratio_data, function(key, ratio_table) {
        var ratio_array = key.split(":");
        var ratio_x = ratio_array[0];
        var ratio_y = ratio_array[1];
        var ratio = ratio_y / ratio_x;
	
        if (ratio > max_ratio) {
            max_ratio = ratio;
        }
    });

    return max_ratio;
}

function calcCompleteWidth(aspect_ratio_data,scale)
{
    // work out the maximum ratio      
    var max_width = 0;

    $.each(aspect_ratio_data, function(key, ratio_table) {
        var ratio_array = key.split(":");
        var ratio_x = ratio_array[0];
        var ratio_y = ratio_array[1];
        var ratio = ratio_y / ratio_x;
	
	max_width += (scale*ratio);
    });

    return max_width;
}


function scaledDivsFitInPage(aspect_ratio_data, scale_to_height, num_of_rows_allowed, la_x_dim)
{
    var divs_fit = true;

    var row = 1;
    var total_row_width = 0;
    var total_height = 0;

    $.each(aspect_ratio_data, function(key, ratio_table) {
        var ratio_array = key.split(":");
        var ratio_x = ratio_array[0];
        var ratio_y = ratio_array[1];
        var ratio = ratio_y / ratio_x;
	
	var scaled_div_width = scale_to_height*ratio;
	if (total_row_width + scaled_div_width > la_x_dim) {
	    // this div doesn't fit on the current row 
	    // => start a new row
	    total_row_width = scaled_div_width;
	    row++;

	    if (row>num_of_rows_allowed) {
		// blow out!
		divs_fit = false;
		return false; // jquery.each equivalent to 'break'
	    }
	}
	else {
	    total_row_width += scaled_div_width;
	    row++;
	}
    });

    return divs_fit;
}


function calcScaleToHeight(aspectRatios,la_x_dim,la_y_dim) 
{
    // determine scale factor so divs max out (as in, filling in the page) based la_y_dim height, 

    var num_of_rows_allowed = 1;
    var scale_to_height = la_y_dim; // optimized version of true calcuation, la_y_dim / num_of_rows_allowed;

    //var div_width  = complete_width_100 * (div_height/100)
    
    var num_flag_bins = aspectRatios.length;
    
    while (!scaledDivsFitInPage(aspectRatios,scale_to_height,num_of_rows_allowed,la_x_dim)) {
	    
	num_of_rows_allowed++;
	
	if (num_of_rows_allowed>num_flag_bins) {
	    // needing more rows than there are flag bins is an indication that things
	    // just don't fit, and so will need to use a scroll bar.
	    // Exiting at this point will naturally achieve this
	    break;
	}

	scale_to_height = la_y_dim/num_of_rows_allowed;
	
	// if get to here, then need 
	
    }

    console.log("**** num_of_rows = " + num_of_rows_allowed + ", scale to height = " + scale_to_height);
    return scale_to_height;
}


$(function() {
    $.getJSON( "../similarity-2d/flag-aspect-ratios-json.jsp", function(data) {

        aspectRatios = data;
	
        //var scale_to_y_dim = 130;
	
        // express scale_to_y_dim to use relative to height of window
	
	var window_height = $(window).height();
	var div_top = $('#aspect-ratio-div').offset().top + 20;

        var la_y_dim = (div_top>0) ? window_height - div_top : window_height * 0.6;
	var la_x_dim = $(window).width() * 0.7;

        //var scale_to_y_dim = la_y_dim/4;
	
        //console.log("*** scale to y dim = " + la_y_dim);
	
        //alert("scale_to_y_dim = " + scale_to_y_dim);


        aspectMaxRatio = calcMaxRatio(aspectRatios);
	//var complete_width_100 = calcCompleteWidth(aspectRatios,100); // as if every aspect ratio bin is scaled to 100 pixels high

	
	scale_to_y_dim = calcScaleToHeight(aspectRatios,la_x_dim,la_y_dim);


        var items = [];
	
	
        $.each(data, function(key, ratio_table) {
            var freq = ratio_table.freq;
            var ratio_array = key.split(":");
            var ratio_x = ratio_array[0];
            var ratio_y = ratio_array[1];
            var ratio = ratio_y / ratio_x;
	    
            var ratioScale = aspectMaxRatio/ratio;
	    
            var x_dim = Math.round(scale_to_y_dim * ratioScale);
            var y_dim = scale_to_y_dim;
	    
            var innertext = "<div style='font-size: 180%;'>"+freq + " countries, " + key + "</div>";
            
            var flags = [];
	    
            var nz_prioritized_flags = ratio_table.flags.sort();
	    
            // Promote NZ flag to start of array, but otherwise keep sorted
            var p = nz_prioritized_flags.length-1;
            var found_nz = false;
	    
            while (p>0) {                
                var curr;
                var curr_title;
		
                if (!found_nz) {
                    curr = ratio_table.flags[p];
                    curr_title = curr.replace(/^.*\//,"").replace(/\.(.*?)$/,"");
                }
		
                if (curr_title == "nz") {
                    found_nz = true;

                    // swap with adjacent cell
                    var tmp_m1 = nz_prioritized_flags[p-1];
                    nz_prioritized_flags[p-1] = curr;
                    nz_prioritized_flags[p] = tmp_m1;
                }
                p--;
            }
	    
            $.each(nz_prioritized_flags, function(index, flag_filename) {                
                var title = flag_filename.replace(/^.*\//,"").replace(/\.(.*?)$/,"");
		
                flags.push("<img src='../similarity-2d/"+flag_filename+"' id='aspect-ratio-"+ title +"' style='height: 70px; padding: 3px; ' title='" + title.toUpperCase() + "'/>");
            });
	    
            innertext += flags.join("");
	    
            var ratio_id = "ratio-" + key.replace(":","_");
            if (found_nz) {
                currentRatio = ratio_id;
            }
	    
            var id = " id='" + ratio_id + "'";
	    
            var style = "style='width:" + x_dim + "px; height:" + y_dim + "px;";
            if (found_nz) {
                style += "border-color:white; border-width:4px;"
            }
	    
            style += " overflow-y:scroll;";
            style += "'";
	    
            var onclick = " onclick='updateCanvasDimensions("+ratio_y + "," + ratio_x + ")'";
	    
            items.push( "<div class='ratioDiv'" + id + style + onclick + ">"+ innertext + "</div>" );
	    
        });
	
        $('#aspect-ratio-div').append("<div class='centredDiv' style='width: 100%'>"+items.join("\n")+"</div>");
	
	
        // now change the flag tooltip labels into their country names
        $.getJSON( "../similarity-2d/iso-3166-keyed-by-alpha-2-countrycodes.json", function(data) {
	    
            $.each( data, function( iso2_key, country_name ) {
		var $img = $('#aspect-ratio-'+iso2_key.toLowerCase());
		var title = $img.attr("title") + ": " + country_name;
		$img.attr("title",title);
            }
          )
		});
	
    });
});



$(window).resize(function() {
    console.log("choose-canvas resize()");

    //console.log("*** aspect ratio div position top = " + $('#aspect-ratio-div').position().top);
    
    var window_height = $(window).height();
    var div_top = $('#aspect-ratio-div').offset().top + 20;

    //var top = 0;
    
    var la_y_dim = window_height - div_top;
    var la_x_dim = $(window).width() * 0.7;

    var scale_to_y_dim = calcScaleToHeight(aspectRatios,la_x_dim,la_y_dim);

    // (top==0) ? la_y_dim/4 : la_y_dim/2.8;
    
    //console.log("*** scale to y dim = " + la_y_dim);
    
    $.each(aspectRatios, function(key, ratio_table) {
        var freq = ratio_table.freq;
        var ratio_array = key.split(":");
        var ratio_x = ratio_array[0];
        var ratio_y = ratio_array[1];
        var ratio = ratio_y / ratio_x;
	
        var ratioScale = aspectMaxRatio/ratio;
	
        var x_dim = Math.round(scale_to_y_dim * ratioScale);
        var y_dim = scale_to_y_dim;

        var ratio_id = "ratio-" + key.replace(":","_");
	
        //console.log("*** ratio_id = " + ratio_id + " xdim = " + x_dim + ", ydim = " + y_dim);
	
        $('#'+ratio_id).css("width",x_dim + "px");
        $('#'+ratio_id).css("height",y_dim + "px");
	
	
    });
});



function updateCanvasDimensions(height, width) {
    
    // Show feedback by highlighting the chosen square
    document.getElementById(currentRatio).style.borderColor = 'black';
                document.getElementById(currentRatio).style.borderWidth = '1px';
    currentRatio = "ratio-" + width + "_" + height;
    document.getElementById(currentRatio).style.borderColor = 'white';
    document.getElementById(currentRatio).style.borderWidth = '4px';
    
    // Changing the value of sizeConstant will change the
    //  size of the svg canvas without affecting the 
    //  width/height ratios
    
    var sizeConstant = 400;
    
    var h = sizeConstant;
    var w = (sizeConstant / height) * width;                
    
    if (typeof flagCanvasSettings !== 'undefined') {
        flagCanvasSettings.width = w;
        flagCanvasSettings.height = h;
    }                               
}