/*\
title: js/WikiTextParseTree.js

A container for the parse tree generated by parsing wikitext

\*/
(function(){

/*jslint node: true */
"use strict";

var WikiTextRenderer = require("./WikiTextRenderer.js").WikiTextRenderer,
	HTML = require("./HTML.js").HTML,
	ArgParser = require("./ArgParser.js").ArgParser,
	utils = require("./Utils.js");

// Intialise the parse tree object
var WikiTextParseTree = function(tree,dependencies,store) {
	this.tree = tree;
	this.dependencies = dependencies;
	this.store = store;
};

// Compile the parse tree into a JavaScript function that returns the required
// representation of the tree
WikiTextParseTree.prototype.compile = function(type,treenode) {
	/*jslint evil: true */
	treenode = treenode || this.tree;
	var renderer = new WikiTextRenderer(),
		renderStep = {},
		renderStepIndex = renderer.addRenderStep(renderStep),
		output = [];
	if(type === "text/html") {
		this.compileSubTreeHtml(output,renderer,treenode);
	} else if(type === "text/plain") {
		this.compileSubTreePlain(output,renderer,treenode);
	} else {
		return null;
	}
	// Create the parse tree for the rendering step function definition
	var parseTree = this.store.jsParser.createTree(
		[
			{
				type: "Function",
				name: null,
				params: ["tiddler","renderer","store","utils"], // These are the parameters passed to the tiddler function; must match the invocation in WikiStore.renderTiddler()
				elements: [
					{
					type: "ReturnStatement",
					value: {
						type: "FunctionCall",
						name: {
							type: "PropertyAccess",
							base: {
								type: "ArrayLiteral",
								elements: output
							},
							name: "join"
						},
						"arguments": [ {
							type: "StringLiteral",
							value: ""
							}
						]
						}
					}
				]
			}
		]);
	renderStep.type = "main";
	renderStep.step = renderStepIndex;
	renderStep.dependencies = {};
	renderStep.handler = parseTree.compile("application/javascript").render;
	return renderer;
};

var pushString = function(output,s) {
	var last = output[output.length-1];
	if(output.length > 0 && last.type === "StringLiterals") {
		last.value.push(s);
	} else if (output.length > 0 && last.type === "StringLiteral") {
		last.type = "StringLiterals";
		last.value = [last.value,s];
	} else {
		output.push({type: "StringLiteral", value: s});
	}
};

WikiTextParseTree.prototype.compileMacroCall = function(output,renderer,type,node) {
	/*jslint evil: true */
	var name = node.name,
		params = node.params,
		macro = this.store.macros[name],
		p,
		n,
		renderStep = {},
		renderStepIndex = renderer.addRenderStep(renderStep);
	// Check for errors
	if(!macro) {
		pushString(output,"{{** Unknown macro '" + name + "' **}}");
		return;
	}
	if(macro.types.indexOf(type) === -1) {
		pushString(output,"{{**  Macro '" + name + "' cannot render to MIME type '" + type + "'**}}");
		return;
	}
	renderStep.type = "macro";
	renderStep.macro = name;
	renderStep.renderType = type;
	renderStep.step = renderStepIndex;
	renderStep.dependencies = node.dependencies;
	// Slot the parameters into the macro call
	var properties = [];
	for(p in params) {
		if(params[p].type === "string") {
			n = {type: "StringLiteral", value: params[p].value};
		} else {
			n = this.store.jsParser.parse(params[p].value).tree.elements[0];
		}
		properties.push({
			type: "PropertyAssignment",
			name: p,
			value: n
		});
	}
	renderStep.params = this.store.jsParser.createTree([
			{
				type: "Function",
				name: null,
				params: ["tiddler","renderer","store","utils"], // These are the parameters passed to the tiddler function; must match the invocation in WikiStore.renderTiddler()
				elements: [ {
					type: "ReturnStatement",
					value: {
						type: "ObjectLiteral",
						properties: properties
					}
				} ]
			}
		]).compile("application/javascript").render;
	// Compile any child nodes
	var subOutput = [];
	if(node.children) {
		this.compileSubTreeHtml(subOutput,renderer,node.children);
	}
	renderStep.content = this.store.jsParser.createTree([
		{
			type: "Function",
			name: null,
			params: ["tiddler","renderer","store","utils"], // These are the parameters passed to the tiddler function; must match the invocation in WikiStore.renderTiddler()
			elements: [
				{
				type: "ReturnStatement",
				value: {
					type: "FunctionCall",
					name: {
						type: "PropertyAccess",
						base: {
							type: "ArrayLiteral",
							elements: subOutput
						},
						name: "join"
					},
					"arguments": [ {
						type: "StringLiteral",
						value: ""
						}
					]
					}
				}
			]
		}
	]).compile("application/javascript").render;
	// Add the wrapper node
	var wrapperTag = macro.wrapperTag || "div";
	if(type === "text/html" && !this.store.disableHtmlWrapperNodes) {
		pushString(output,HTML(HTML.elem(wrapperTag,{
			"data-tw-macro": name,
			"data-tw-render-step": renderStepIndex
		})));
	}
	// Output the macro call
	output.push({
		type: "FunctionCall",
		name: {
			base: {
				name: "renderer", 
				type: "Variable"}, 
			name: "render", 
			type: "PropertyAccess"},
		"arguments": [ {
			type: "Variable",
			name: "tiddler"
		},{
			type: "Variable",
			name: "store"
		},{
			type: "NumericLiteral",
			value: renderStepIndex	
		}]
	});
	if(type === "text/html" && !this.store.disableHtmlWrapperNodes) {
		pushString(output,"</" + wrapperTag + ">");
	}
};

WikiTextParseTree.prototype.compileElementHtml = function(output,renderer,element,options) {
	options = options || {};
	pushString(output,HTML(HTML.elem(element.type,element.attributes)));
	if(!options.selfClosing) {
		if(element.children) {
			this.compileSubTreeHtml(output,renderer,element.children);
		}
		pushString(output,"</" + element.type + ">");
	}
};

WikiTextParseTree.prototype.compileSubTreeHtml = function(output,renderer,tree) {
	for(var t=0; t<tree.length; t++) {
		switch(tree[t].type) {
			case "text":
				pushString(output,utils.htmlEncode(tree[t].value));
				break;
			case "entity":
				pushString(output,tree[t].value);
				break;
			case "br":
			case "img":
				this.compileElementHtml(output,renderer,tree[t],{selfClosing: true}); // Self closing elements
				break;
			case "macro":
				this.compileMacroCall(output,renderer,"text/html",tree[t]);
				break;
			default:
				this.compileElementHtml(output,renderer,tree[t]);
				break;
		}
	}
};

WikiTextParseTree.prototype.compileElementPlain = function(output,renderer,element,options) {
	options = options || {};
	if(!options.selfClosing) {
		if(element.children) {
			this.compileSubTreePlain(output,renderer,element.children);
		}
	}
};

WikiTextParseTree.prototype.compileSubTreePlain = function(output,renderer,tree) {
	for(var t=0; t<tree.length; t++) {
		switch(tree[t].type) {
			case "text":
				pushString(output,tree[t].value);
				break;
			case "entity":
				var c = utils.entityDecode(tree[t].value);
				if(c) {
					pushString(output,c);
				} else {
					pushString(output,tree[t].value);
				}
				break;
			case "br":
			case "img":
				this.compileElementPlain(output,renderer,tree[t],{selfClosing: true}); // Self closing elements
				break;
			case "macro":
				this.compileMacroCall(output,renderer,"text/plain",tree[t]);
				break;
			default:
				this.compileElementPlain(output,renderer,tree[t]);
				break;
		}
	}
};

// Render the parse tree to a debugging string of the specified MIME type
WikiTextParseTree.prototype.toString = function(type) {
	var renderNode,
		renderArray = function(tree) {
			var children = [];
			for(var t=0; t<tree.length; t++) {
				children.push(HTML.elem("li",{
					"class": ["nodeWikiText"]
				},renderNode(tree[t])));
			}
			return HTML.elem("ul",{
				"class": ["treeWikiText"]
			},children);
		},
		renderTextNode = function(node) {
			return [HTML.splitLabel(
				node.type,
				[HTML.text(node.type)],
				[HTML.raw(utils.htmlEncode(node.value).replace(/\n/g,"<br>"))],
				["treeNode"]
			)];
		},
		renderDependencies = function(dependencies) {
			var output = [];
			for(var d in dependencies) {
				if(d === "dependentAll") {
					output.push(HTML.splitLabel("dependency",[HTML.text(d)],[HTML.text(dependencies[d])]));
				} else {
					var dependents = [];
					for(var t in dependencies[d]) {
						dependents.push(t);
					}
					output.push(HTML.splitLabel("dependency",[HTML.text(d)],[HTML.text(dependents.join(", "))]));
				}
			}
			return HTML.splitLabel(
				"dependencies",
				[HTML.text("Dependencies")],
				output
			);
		},
		renderMacroNode = function(node) {
			var params = [],
				ret = [];
			for(var p in node.params) {
				var v = node.params[p].value;
				if(node.params[p].type === "eval") {
					v = "{{" + v + "}}";
				}
				params.push(HTML.splitLabel(
					"param",
					[HTML.text(p)],
					[HTML.text(v)]
				));
			}
			ret.push(HTML.splitLabel(
				"macro",
				[HTML.text(node.name)],
				params,
				["treeNode"]
			));
			if(node.dependencies) {
				ret.push(renderDependencies(node.dependencies));
			}
			if(node.children) {
				ret.push(renderArray(node.children));
			}
			return ret;
		},
		renderHtmlNode = function(node) {
			var attributes = [],
				ret = [];
			for(var a in node.attributes) {
				var v = node.attributes[a];
				if(typeof v === "string") {
					v = v;
				} else if(v instanceof Array) {
					v = v.join("; ");
				} else if(typeof v === "object") {
					var o = [];
					for(var n in v) {
						o.push(n,":",v[n],";");
					}
					v = o.join("");
				}
				attributes.push(HTML.splitLabel(
					"attribute",
					[HTML.text(a)],
					[HTML.text(v)]
				));
			}
			ret.push(HTML.splitLabel(
				"html",
				[HTML.text(node.type)],
				attributes,
				["treeNode"]
			));
			if(node.children) {
				ret.push(renderArray(node.children));
			}
			return ret;
		};
	renderNode = function(node) {
			if(node.type === "text") {
				return renderTextNode(node);
			} else if(node.type === "macro") {
				return renderMacroNode(node);
			} else {
				return renderHtmlNode(node);
			}
		};
	return HTML(renderDependencies(this.dependencies),type) + HTML(renderArray(this.tree),type);
};

exports.WikiTextParseTree = WikiTextParseTree;

})();