//narwhal ~/karma/mainline/bin/kbuild.js --karma-src-dir karmaSrcDir --build-dir build --lessons-src-dir lessonsSrcDir --tag stable --bundle-type xo


//requires narwhal
var file = require('file');
var os = require('os');
var args = require('args');

//list of repos for lessons
var LESSONS = [ [" git://git.sugarlabs.org/karma_adding_up_to_10_svg/mainline.git", 
		 "karma_adding_up_to_10_svg"], 
	     // ["gitorious@git.sugarlabs.org:karma_conozco-uruguay/mainline.git", 
	     //  'karma_Conozco-Uruguay'],
	     // ["~/karma/lessons/English_Alphabet_Puzzle_Solving", 
	     //  'karma_English_Alphabet_Puzzle_Solving'] 
	    ];

var KARMA_REPO = "~/karma/mainline/";
var buildDir = "./build/";
var buildHtmlDir = './';
var bundleSrcDir = "tools/";
var bundleType = 'xo';
var tag = "master";
var lessonsSrcDir = buildDir + '/lessons/';
var lessonSrcDir = lessonsSrcDir;
var includedLessons = [];

var parseOptions = function(){
    //parse args
    var parser = new args.Parser();
    parser.help('Builds and distributes Karma bundle to different type of targets');

    parser.option('-t', '--tag', 'tag')
	.help("which tag to checkout for all lessons")
	.set();

    parser.option('--build-dir', 'buildDir')
	.help("directory where bundle is built")
        .def('build/')
	.set();    
    
    parser.option('--bundle-type', 'bundleType')
	.help("type of bundle to be built. Examples: 'web' for use on a website" +
	     " 'xo' to create a .xo bundle for the Sugar environment")
	.def('xo')
	.choices(['xo', 'web'])
	.set();
	
    parser.helpful();

    var options = parser.parse(system.args);

    tag = options.tag || tag;
    KARMA_REPO = options.KARMA_REPO || KARMA_REPO;
    buildDir = options.buildDir || buildDir;
    lessonsSrcDir = options.lessonsSrcDir || lessonsSrcDir;
    bundleType = options.bundleType || bundleType;

    if(bundleType === 'xo'){
	bundleSrcDir = bundleSrcDir + '/xo_bundle';
    } 


    if (buildDir === bundleSrcDir || buildDir === lessonsSrcDir || 
       bundleSrcDir === lessonsSrcDir){
	throw new Error("The arguments you supplied for KARMASRCDIR, BUILDDIR, and " +
			"LESSONSSRCDIR are not unique. These arguments must be unique");
	exit();
    }
};


var prepareKarmaSrcDir = function(){
    
    //check that the gitdir exists
    //if not create it
    var cmd = '';
    var proc = '';
    var exitCode;

    if(!file.exists(bundleSrcDir)){
	file.mkdir(bundleSrcDir);   
    } 

    if (!file.exists(bundleSrcDir + '/.git')){
	cmd = "git clone " + KARMA_REPO + " " + bundleSrcDir;
	proc = os.popen(cmd);
	exitCode = proc.wait();
	if (exitCode !== 0){
	    throw new Error("Could not clone the bundle repository: " +
			    KARMA_REPO + "\nResults of shell commands \n" + 
			    proc.stderr.read());
	} 
    } else {
	//pull newest version
	cmd = "cd " + bundleSrcDir + ";git pull origin master ";
	proc = os.popen(cmd);
	exitCode = proc.wait();
	if (exitCode !== 0){
	    throw new Error("Could not update the bundle repository: " +
			    KARMA_REPO + "\nResults of shell commands \n" + 
			    proc.stderr.read());
	}
    }
};

var prepareLessonsSrcDir = function(){
    if(!file.exists(lessonsSrcDir)){
	file.mkdir(lessonsSrcDir);   
    } 
};


var prepareEachLessonSrcDir = function(repo){
    var cmd = '';
    var proc = '';
    var exitCode = '';
    var lessonRepo = repo[0];
    var lessonName = repo[1];
    lessonSrcDir = lessonsSrcDir +'/' + lessonName;
    
    if(!file.exists(lessonSrcDir)){
	file.mkdir(lessonSrcDir);   
    } 
    
    if (!file.exists(lessonSrcDir + '/.git')){
	cmd = "git clone " + lessonRepo + " " + lessonSrcDir;
	proc = os.popen(cmd);
	exitCode = proc.wait();
	if (exitCode !== 0){
	    throw new Error("Could not clone the lesson repository: " +
			    lessonRepo + "\nResults of shell commands \n" + 
			    proc.stderr.read());
	}
    } 

    //pull version that matches tag supplied by user
    cmd = "cd " + lessonSrcDir + ";git pull -t origin master; git checkout " + tag;
    proc = os.popen(cmd);
    exitCode = proc.wait();
    if (exitCode !== 0){
	print("There isn't a commit in that lesson repository " +
	      lessonRepo + "\n that matches the tag " + tag + 
	      "\nResults of shell commands \n" + 
	      proc.stderr.read());
    } else{
	includedLessons.push(lessonName);

    }
 };


//check that build dir exists, if not create it
var prepareBuildDir = function(){
    var cmd = '';
    var proc = '';
    var exitCode = '';

    var copyLesson2BuildDir = function(lesson){
	    cmd = "cp -r " + lessonsSrcDir + "/" + lesson + 
		" " + buildHtmlDir + "/lessons/;" +
		"find " + buildDir + " -d -name '.git' " +
		"-exec rm -rf {} \\; ";
	    proc = os.popen(cmd);
	    print(proc.stdout.read());
	    exitCode = proc.wait();
	    if (exitCode !== 0){
		throw new Error("Couldn't copy lesson from " + lesson + " to " +
				buildDir + "\nStderr " + proc.stderr.read());	
	    }
	    delete proc;
    };

    if(file.exists(buildDir)){
	proc = os.popen("rm -rf " + buildDir);
	exitCode = proc.wait();
	if (exitCode !== 0){
	    throw new Error("Couldn't remove directory " + buildDir);
	}
	delete proc;
    }
    
    file.mkdir(buildDir);    

    if (bundleType === "web"){
	//copy over the web bundle
	buildHtmlDir = buildDir;

	var copyWebBundle2BuildDir = function(){
	    cmd = "cp -r " + bundleSrcDir + "/* " + buildDir +
		"/; rm -rf " + buildDir + "/bundles" +
		"; rm -rf " + buildDir + "/docs" +
		"; rm -rf " + buildDir + "/tests" +
		"; rm -rf " + buildDir + "/bin" +
		"; rm -rf " + buildDir + "/lessons" +
		"; mkdir -p " + buildDir + "/lessons" +
		"; find " + buildDir + " -d -name '.git' " +
		"-exec rm -rf {} \\; ";
	    proc = os.popen(cmd);
	    exitCode = proc.wait();
	    if (exitCode !== 0){
		throw new Error("Couldn't copy from directory " + bundleSrcDir + " to " +
				buildDir + "\nStderr " + proc.stderr.read());
	    }

	    delete proc;
	};
	
	copyWebBundle2BuildDir();
	
    } else if (bundleType === "xo"){
	buildHtmlDir = buildDir + "/karma";
	//copy over XO bundle and lesson stuff
	var copyXoBundle2BuildDir = function(){
	    cmd = "cp -r " + bundleSrcDir + "/bundles/xo/* " + buildDir +
		"/; rm -rf " + buildHtmlDir +
		"; mkdir -p " + buildHtmlDir + "/lessons" +
		"; cp -r " + bundleSrcDir + "/assets " + buildHtmlDir +
		"; cp -r " + bundleSrcDir + "/css " + buildHtmlDir  +
		"; cp -r " + bundleSrcDir + "/index* " + buildHtmlDir +
		"; cp -r " + bundleSrcDir + "/js " + buildHtmlDir + 
		"; find " + buildDir + " -d -name '.git' " +
		"-exec rm -rf {} \\; ";
	    proc = os.popen(cmd);
	    exitCode = proc.wait();
	    if (exitCode !== 0){
		throw new Error("Couldn't copy from directory " + bundleSrcDir + " to " +
				buildDir + "\nStderr " + proc.stderr.read());
	    }
	    delete proc;
	};    
	
	copyXoBundle2BuildDir();
    }    
	includedLessons.forEach(copyLesson2BuildDir);

};

var moveJsLibraries = function() {
    var cmd = '';
    var proc;
    var exitCode;
    
    //move all the js libraries to the common js folder except for lesson.js
    var moveCommonJsFiles = function(){
	cmd = "find " + buildHtmlDir + "/lessons -name '*.js' \\! -name 'lesson.js'" +
	    " -exec mv -n {} " + buildHtmlDir + "/js  \\;;" +
            "find " + buildHtmlDir + "/lessons -name '*.js' \\! -name 'lesson.js'" +
	    " -exec rm {} \\;";

	proc = os.popen(cmd);
	exitCode = proc.wait();
	if (exitCode !== 0){
	    throw new Error("Couldn't move directories to " +
			    buildHtmlDir + "\nStderr: " + proc.stderr.read());
	}
	delete proc;
    };

    var changeHtmlScriptPaths = function(){
	/*	sed -n 's/src="\.*\/*\(js\/.*\.js\)"/src="..\/..\/\1"/p' index.html
	# fix lesson.js so its path is unchanged
	sed -n 's/src="\.*\/*\.*\/*\(js\/lesson.js\)"/src=".\/\1"/p' index.html
	 */
	var cmdFindIndexFiles = 
	    "find " + buildHtmlDir + "/lessons -name '*.html' -exec ";
	var cmdChangePaths = 
	    "sed -i 's/src=\"\\.*\\/*\\(js\\/.*.js\\)\"/src=\"..\\/..\\/\\1\"/g' {} \\;";
	var cmdFixLessonJs = 
	    "sed -i 's/src=\"\\.*\\/*\\.*\\/*\\(js\\/lesson.js\\)\"/src=\"\\.\\/\\1\"/g'" +
	    " {} \\;";
	cmd = cmdFindIndexFiles + cmdChangePaths + ';' +
	      cmdFindIndexFiles + cmdFixLessonJs;
	print(cmd);
	proc = os.popen(cmd);
	exitCode = proc.wait();
	if (exitCode !== 0){
	    throw new Error("Couldn't change js references " +
			    "\nStderr: " + proc.stderr.read());
	}
	print(proc.stderr.read());
	delete proc;
    };
    

    moveCommonJsFiles();
    changeHtmlScriptPaths();
    
};



parseOptions();
prepareKarmaSrcDir();
prepareLessonsSrcDir();
LESSONS.forEach(prepareEachLessonSrcDir);
prepareBuildDir();
moveJsLibraries();


//command for appending text to part of an html file
// sed -i '/<some html>/a\foo' index.html