/*\
title: $:/core/modules/commands/server.js
type: application/javascript
module-type: command

Serve tiddlers over http

\*/
(function(){

/*jslint node: true, browser: true */
/*global $tw: false */
"use strict";

exports.info = {
	name: "server",
	synchronous: true
};

var Command = function(params,commander,callback) {
	this.params = params;
	this.commander = commander;
	this.callback = callback;
};

Command.prototype.execute = function() {
	var self = this,
		util = require("util"),
		fs = require("fs"),
		url = require("url"),
		path = require("path"),
		http = require("http"),
		port = this.params[0] || "8080",
		rootTiddler = this.params[1] || "$:/core/templates/tiddlywiki5.template.html",
		renderType = this.params[2] || "text/plain",
		serveType = this.params[3] || "text/html",
		prefix;
	http.createServer(function(request, response) {
		var requestPath = url.parse(request.url).pathname,
			text;
		switch(request.method) {
			case "PUT":
				var data = "";
				request.on("data",function(chunk) {
					data += chunk.toString();
				});
				request.on("end",function() {
					prefix = "/recipes/default/tiddlers/";
					if(requestPath.indexOf(prefix) === 0) {
						var title = decodeURIComponent(requestPath.substr(prefix.length)),
							fields = JSON.parse(data);
						// Use the title from the PUT URL if we don't have one
						if(!fields.title) {
							fields.title = title;
						}
						// Pull up any subfields in the `fields` object
						if(fields.fields) {
							$tw.utils.each(fields.fields,function(field,name) {
								fields[name] = field;
							});
							delete fields.fields;
						}
						// Remove any revision field
						if(fields["revision"]) {
							delete fields["revision"];
						}
console.log("PUT tiddler",title,fields)
						self.commander.wiki.addTiddler(new $tw.Tiddler(JSON.parse(data),{title: title}));
						var changeCount = self.commander.wiki.getChangeCount(title).toString();
						response.writeHead(204, "OK",{
							Etag: "\"default/" + title + "/" + changeCount + ":\""
						});
						response.end();
					} else {
						response.writeHead(404);
						response.end();
					}
				});
				break;
			case "DELETE":
				prefix = "/bags/default/tiddlers/";
				if(requestPath.indexOf(prefix) === 0) {
					var title = decodeURIComponent(requestPath.substr(prefix.length));
console.log("DELETE tiddler",title)
					self.commander.wiki.deleteTiddler(decodeURIComponent(title));
					response.writeHead(204, "OK");
					response.end();
				} else {
					response.writeHead(404);
					response.end();
				}
				break;
			case "GET":
				if(requestPath === "/") {
					response.writeHead(200, {"Content-Type": serveType});
					text = self.commander.wiki.renderTiddler(renderType,rootTiddler);
					response.end(text,"utf8");
				} else if(requestPath === "/status") {
					response.writeHead(200, {"Content-Type": "application/json"});
					text = JSON.stringify({
						username: "ANONYMOUS",
						space: {
							recipe: "default"
						},
						tiddlywiki_version: $tw.version
					});
					response.end(text,"utf8");
				} else if(requestPath === "/recipes/default/tiddlers.json") {
					response.writeHead(200, {"Content-Type": "application/json"});
					var tiddlers = [];
					$tw.wiki.forEachTiddler("title",function(title,tiddler) {
						var tiddlerFields = {};
						$tw.utils.each(tiddler.fields,function(field,name) {
							if(name !== "text") {
								tiddlerFields[name] = tiddler.getFieldString(name);
							}
						});
						tiddlerFields["revision"] = $tw.wiki.getChangeCount(title);
						tiddlers.push(tiddlerFields);
					});
					text = JSON.stringify(tiddlers);
					response.end(text,"utf8");
				} else {
					prefix = "/recipes/default/tiddlers/";
					if(requestPath.indexOf(prefix) === 0) {
						var title = decodeURIComponent(requestPath.substr(prefix.length)),
							tiddler = $tw.wiki.getTiddler(title),
							tiddlerFields = {},
							knownFields = [
								"bag", "created", "creator", "modified", "modifier", "permissions", "recipe", "revision", "tags", "text", "title", "type", "uri"
							];
						if(tiddler) {
							$tw.utils.each(tiddler.fields,function(field,name) {
								var value = tiddler.getFieldString(name)
								if(knownFields.indexOf(name) !== -1) {
									tiddlerFields[name] = value;
								} else {
									tiddlerFields.fields = tiddlerFields.fields || {};
									tiddlerFields.fields[name] = value;
								}
							});
							response.writeHead(200, {"Content-Type": "application/json"});
							response.end(JSON.stringify(tiddlerFields),"utf8");
						} else {
							response.writeHead(404);
							response.end();
						}
					} else {
						response.writeHead(404);
						response.end();
					}
				}
				break;
			case "POST":
				response.writeHead(404);
				response.end();
				break;
			}
	}).listen(port);
	if(this.commander.verbose) {
		console.log("Serving on port " + port);
	}
	return null;
};

exports.Command = Command;

})();