/***
|''Name''|RandomColorPalettePlugin|
|''Description''|Adds a random color palette to TiddlyWiki|
|''Author''|Jon Robson|
|''Version''|1.4.0|
|''Status''|stable|
|''Source''|https://github.com/jdlrobson/TiddlyWikiPlugins/raw/master/plugins/RandomColorPalettePlugin/RandomColorPalettePlugin.js|
|''License''|[[BSD|http://www.opensource.org/licenses/bsd-license.php]]|
!Usage
{{{
<<RandomColorPalette>>
}}}
Sets and saves a random color palette on execution

{{{
<<RandomColorPaletteButton>>
}}}
Creates a button, which when clicked will change the color palette
More information at http://macros.tiddlyspace.com/#%5B%5BRandomColorPaletteButton%20macro%5D%5D
!Code
***/
//{{{
RGB.prototype.toRGBString = function() {
	return "rgb(%0,%1,%2)".format(parseInt(this.r * 255, 10),
		parseInt(this.g * 255, 10), parseInt(this.b * 255, 10))
}
function HSL_TO_RGB(h, s, l) { // h (hue) between 0 and 360, s (saturation) & l (lightness) between 0 and 1
	var c = l <= 0.5 ? 2 * l * s : ( 2 - (2 * l)) * s;
	var h1 = h / 60;
	var x = c * (1 - Math.abs((h1 % 2) - 1)); 
	var r, g, b;
	if(typeof(h) == 'undefined') {
		r = 0;
		g = 0;
		b = 0;
	} else if(0 <= h1 && h1 < 1) {
		r = c;
		g = x;
		b = 0;
	} else if(1 <= h1 && h1 < 2) {
		r = x;
		g = c;
		b = 0;
	} else if(2 <= h1 && h1 < 3) {
		r = 0;
		g = c;
		b = x;
	} else if(3 <= h1 && h1 < 4) {
		r = 0;
		g = x;
		b = c;
	} else if(4 <= h1 && h1 < 5) {
		r = x;
		g = 0;
		b = c;
	} else if(5 <= h1 && h1 < 6) {
		r = c;
		g = 0;
		b = x;
	}
	m = l - (0.5 * c);
	return new RGB(r + m, g + m, b + m);
}

(function($){
	var macro = config.macros.RandomColorPalette = {
		messagesOn: false, 
		changedPaletteText: "We have assigned you a random theme by adjusting the [[ColorPalette]] tiddler.\nDon't like it? Click <<RandomColorPalette>> for another one.", 
		handler: function(place, macroName, params, wikifier, paramString, tiddler) {
			paramString = paramString || "";
			var options = macro.getOptions(paramString);
			macro.generatePalette(options, true);
		},
		optionTypes: {
			floats: ["hue", "saturation", "darkest", "lightness", "huevariance", "dark", "pale", "light", "mid",
				"saturation_light", "saturation_pale", "saturation_mid", "saturation_dark"
			]
		},
		getOptions: function(paramString) {
			var args = paramString.parseParams("name", null, true, false, true)[0];
			var options = {};
			var numbers = macro.optionTypes.floats;
			for(var i in args) {
				options[i] = numbers.indexOf(i) > -1 ? parseFloat(args[i][0], 10) : args[i][0];
			}
			return options;
		},
		generateRandomNumber: function(min, max, info) {
			var num = (Math.random() * 1);
			info = !info ? { attempts:0 } : info;
			info.attempts += 1;
			var good = true;
			if(min == max) {
				return max;
			}
			if(min && num < min) {
				good = false;
			} else if(max && num > max) {
				good = false;
			}
			if(!good) {
				if(info.attempts < 5) {
					return macro.generateRandomNumber(min, max, info);
				} else {
					if(max) {
						return max;
					} else if(min) {
						return min;
					} else {
						return 1;
					}
				}
			}
			return num;
		},
		getExistingPalette: function(asJSON) {
			var title = "ColorPalette";
			var tiddlerText;
			if(store.tiddlerExists(title)) {
				tiddlerText = store.getTiddlerText(title);
			} else if(store.isShadowTiddler(title)){
				tiddlerText = config.shadowTiddlers[title];
			}
			if(asJSON) {
				var json = {};
				if(tiddlerText) {
					var lines = tiddlerText.split("\n");
					for(var i = 0; i < lines.length; i++) {
						var definition = lines[i].split(":");
						if(definition.length == 2) {
							var name = definition[0].trim();
							var value = definition[1].trim();
							json[name] = value;
						}
					}
				}
				return json;
			} else {
				return tiddlerText;
			}
		},
		generatePalette: function(options, save) {
			var outputRGB = options.rgb;
			var palette = macro.getExistingPalette(true);
			var hue = options.hue || Math.floor(Math.random() * 359);
			var saturation = options.saturation || macro.generateRandomNumber(0.3, 0.7);
			var dark = options.dark || options.darkest || macro.generateRandomNumber(0, 0.10);
			var pale = options.pale || options.lightness || macro.generateRandomNumber(0.90, 1);
			var delta = ( ( pale - dark ) / 3 );
			var mid = options.mid || dark + delta;
			var light = options.light || dark + (delta * 2);
			var lightness_values = {Dark: dark, Mid: mid, Light: light, Pale: pale};
			var saturation_values = {};
			for(i in lightness_values) {
				if(true) {
					saturation_values[i] = options["saturation_" + i.toLowerCase()] || saturation;
				}
			}

			var opposite_hue = (hue + 180) % 360;
			var seed = options.huevariance || Math.floor((85 * Math.random()) + 5); // we want it to be at least 5 degrees
			var huetwo = (opposite_hue + seed) % 360;
			var huethree = (opposite_hue - seed) % 360;
			if(huetwo < 0) {
				huetwo = 360 + huetwo;
			}
			if(huethree < 0) {
				huethree = 360 + huethree;
			}
			for(var j in lightness_values) {
				if(true) {
					var saturation = saturation_values[j];
					palette["Primary" + j] = HSL_TO_RGB(hue, saturation, lightness_values[j]);
					palette["Secondary" + j] = HSL_TO_RGB(huetwo, saturation, lightness_values[j]);
					palette["Tertiary" + j] = HSL_TO_RGB(huethree, saturation, lightness_values[j]);
				}
			}
			palette.Background = HSL_TO_RGB(hue, saturation, 0.92);
			palette.Foreground = HSL_TO_RGB(hue, saturation, 0.08);
			palette.ColorPaletteParameters = ["HSL([", hue, "|", seed, "], [", saturation_values.Pale, "|",
				saturation_values.Light, "|", saturation_values.Mid, "|", saturation_values.Dark, "],",
				"[", dark, "|", mid, "|", light, "|", pale, "])"].join("");
			// construct new ColorPalette
			var text = ["/*{{{*/\n"];
			var colorcode;
			for(var id in palette) {
				if(true) {
					var color = palette[id];
					colorcode = outputRGB ? color.toRGBString() : color.toString();
					text.push("%0: %1\n".format(id, colorcode));
				}
			}
			text.push("/*}}}*/");
			text = text.join("");
			if(save) {
				macro.saveColorPalette(text);
			}
			return text;
		},
		saveColorPalette: function(text) {
			var tid = store.getTiddler("ColorPalette");
			if(!tid) {
				tid = new Tiddler("ColorPalette");
				tid.fields = merge({}, config.defaultCustomFields);
			} // TODO: detect that the ColorPalette in the space comes from outside recipe
			tid.fields["server.page.revision"] = "false"; // edit conflicts dont matter

			// save the color palette in tid
			tid = store.saveTiddler(tid.title, tid.title, text, tid.modifier, tid.modified,
				tid.tags, tid.fields, false, tid.created, tid.creator);
			// an interval is used to cope with users clicking on the palette button quickly.
			if(macro._nextSave) {
				window.clearTimeout(macro._nextSave);
			}
			macro._nextSave = window.setTimeout(function() {
					autoSaveChanges(null, [tid]);
				}, 2000);
			// temporary workaround for IE.
			$.twStylesheet.remove({ id: "StyleSheetColors" });
			$.twStylesheet.remove({ id: "StyleSheet" });
			refreshAll();
			macro.reportChange();
			return tid;
		},
		reportChange: function() {
			if(macro.messagesOn) { // only display message once..
				var msgPlace = getMessageDiv();
				if(!$(".changedPalette", msgPlace)[0]) {
					var tempPlace = document.createElement("div");
					wikify("{{changedPalette{" + macro.changedPaletteText + "}}}", tempPlace);
					msgPlace.appendChild(tempPlace);
				}
			}
		}
	};
	var btnMacro = config.macros.RandomColorPaletteButton = {
			text: "New ColorPalette",
			tooltip: "Generate a random colour scheme for your TiddlyWiki",
			makeButton: function(place, options) {
				var btnHandler = function(ev) {
					var t = $(ev.target);
					var options = t.data("options");
					macro.generatePalette(options, true);
					ev.preventDefault();
					return false;
				};
				var btn = createTiddlyButton(place, this.text, this.tooltip, btnHandler);
				$(btn).data("options", options);
				return btn;
			},
			handler: function(place, macroName, params, wikifier, paramString, tiddler) {
				var options = macro.getOptions(paramString);
				btnMacro.makeButton(place, options);
			}
	};
})(jQuery);
//}}}