/**
 * @author gero3 / https://github.com/gero3
 * @author tentone / https://github.com/tentone
 * Requires opentype.js to be included in the project
 * Loads TTF files and converts them into typeface JSON that can be used directly to create THREE.Font objects 
 */

"use strict";

THREE.TTFLoader = function(manager)
{
	this.manager = (manager !== undefined) ? manager : THREE.DefaultLoadingManager;
	this.reversed = false;
}

THREE.TTFLoader.prototype.load = function(url, onLoad, onProgress, onError)
{
	var self = this;
	var loader = new THREE.XHRLoader(this.manager);
	loader.setResponseType("arraybuffer");
	loader.load(url, function(buffer)
	{
		var json = self.parse( buffer );
		if(onLoad !== undefined)
		{
			onLoad(json);
		}
	}, onProgress, onError);
}

THREE.TTFLoader.prototype.parse = function(arraybuffer)
{
	if(typeof opentype === "undefined")
	{
		console.warn("TTFLoader requires opentype.js Make sure it\'s included before using the loader");
		return null;
	}

	var font = opentype.parse(arraybuffer);
	return THREE.TTFLoader.convert(font, this.reversed);
}

THREE.TTFLoader.convert = function(font, reversed)
{
	var scale = (100000) / ((font.unitsPerEm || 2048) * 72);
	var result = {};
	result.glyphs = {};

	for(var i = 0; i < font.glyphs.length; i++)
	{
		var glyph = font.glyphs.glyphs[i];

		if(glyph.unicode !== undefined)
		{
			var token = {};
			token.ha = Math.round(glyph.advanceWidth * scale);
			token.x_min = Math.round(glyph.xMin * scale);
			token.x_max = Math.round(glyph.xMax * scale);
			token.o = ""
			
			if(reversed)
			{
				glyph.path.commands = TTFLoader.reverseCommands(glyph.path.commands);
			}

			glyph.path.commands.forEach(function(command, i)
			{
				if(command.type.toLowerCase() === "c")
				{
					command.type = "b";
				}
				
				token.o += command.type.toLowerCase();
				token.o += " "
				
				if(command.x !== undefined && command.y !== undefined){
					token.o += Math.round(command.x * scale);
					token.o += " "
					token.o += Math.round(command.y * scale);
					token.o += " "
				}
				if(command.x1 !== undefined && command.y1 !== undefined)
				{
					token.o += Math.round(command.x1 * scale);
					token.o += " "
					token.o += Math.round(command.y1 * scale);
					token.o += " "
				}
				if(command.x2 !== undefined && command.y2 !== undefined)
				{
					token.o += Math.round(command.x2 * scale);
					token.o += " "
					token.o += Math.round(command.y2 * scale);
					token.o += " "
				}
			});
			result.glyphs[String.fromCharCode(glyph.unicode)] = token;
		}
	}

	result.familyName = font.familyName;
	result.ascender = Math.round(font.ascender * scale);
	result.descender = Math.round(font.descender * scale);
	result.underlinePosition = font.tables.post.underlinePosition;
	result.underlineThickness = font.tables.post.underlineThickness;
	result.boundingBox =
	{
		"yMin": font.tables.head.yMin,
		"xMin": font.tables.head.xMin,
		"yMax": font.tables.head.yMax,
		"xMax": font.tables.head.xMax
	};

	result.resolution = 1000;
	result.original_font_information = font.tables.name;

	return result;
}

THREE.TTFLoader.reverseCommands = function(commands)
{
	var paths = [];
	var path;
	
	commands.forEach(function(c)
	{
		if(c.type.toLowerCase() === "m")
		{
			path = [c];
			paths.push(path);
		}
		else if(c.type.toLowerCase() !== "z")
		{
			path.push(c);
		}
	});
	
	var reversed = [];
	paths.forEach(function(p)
	{
		var result = {"type":"m" , "x" : p[p.length-1].x, "y": p[p.length-1].y};
		reversed.push(result);
		
		for(var i = p.length - 1; i > 0; i--)
		{
			var command = p[i];
			result = {"type":command.type};
			if(command.x2 !== undefined && command.y2 !== undefined)
			{
				result.x1 = command.x2;
				result.y1 = command.y2;
				result.x2 = command.x1;
				result.y2 = command.y1;
			}
			else if(command.x1 !== undefined && command.y1 !== undefined)
			{
				result.x1 = command.x1;
				result.y1 = command.y1;
			}
			result.x =  p[i-1].x;
			result.y =  p[i-1].y;
			reversed.push(result);
		}
	});
	
	return reversed;	
}