#!/usr/bin/env node

var path = require('path');
var amberc = require('./amberc.js');

// get parameters passed to the command line script
// discard the first two parameters which are the node binary and the script name
var parameters = process.argv.slice(2);

// check if at least one parameter was passed to the script
if (1 > parameters.length) {
	print_usage();
	process.exit();
}


// Get Amber root directory from the location of this script so that
// we can find the st and js directories etc.
var amber_dir = path.normalize(path.join(path.dirname(process.argv[1]), '..'));
// Get default location of compiler.jar
var closure_jar = path.resolve(path.join(process.env['HOME'], 'compiler.jar'));

var compiler = new amberc.Compiler(amber_dir, closure_jar);

var configuration = handle_options(parameters, amber_dir);

compiler.main(configuration);


/**
 * Process given program options and update defaults values.
 * Followed by check_for_closure_compiler() and then collect_files().
 */
function handle_options(optionsArray, amber_dir) {
	var programName = [];
	var currentItem = optionsArray.shift();
	var defaults = amberc.createDefaults(amber_dir);

	while(undefined !== currentItem) {
		switch(currentItem) {
			case '-l':
				defaults.load.push.apply(defaults.load, optionsArray.shift().split(','));
				break;
			case '-i':
				defaults.init = optionsArray.shift();
				break;
			case '-m':
				defaults.main = optionsArray.shift();
				break;
			case '-M':
				defaults.mainfile = optionsArray.shift();
				break;
			case '-o':
				defaults.closure = true;
				defaults.closure_parts = true;
				break;
			case '-O':
				defaults.closure = true;
				defaults.closure_full = true;
				break;
			case '-A':
				defaults.closure = true;
				defaults.closure_options = defaults.closure_options + ' --compilation_level ADVANCED_OPTIMIZATIONS';
				defaults.closure_full = true;
				break;
			case '-d':
				defaults.deploy = true;
				break;
			case '-D':
				defaults.output_dir = optionsArray.shift();
				break;
			case '-s':
				defaults.suffix = optionsArray.shift();
				defaults.suffix_used = defaults.suffix;
				break;
			case '-S':
				defaults.loadsuffix = optionsArray.shift();
				defaults.suffix_used = defaults.suffix;
				break;
			case '-v':
				defaults.verbose = true;
				break;
			case '-h':
			case '--help':
			case '?':
				print_usage();
				break;
			default:
				var fileSuffix = path.extname(currentItem);
				switch (fileSuffix) {
					case '.st':
						defaults.stFiles.push(currentItem);
						break;
					case '.js':
						defaults.jsFiles.push(currentItem);
						break;
					default:
						// Will end up being the last non js/st argument
						programName.push(currentItem);
						break;
				};
		};
		currentItem = optionsArray.shift();
	}

	if(1 < programName.length) {
		throw new Error('More than one name for ProgramName given: ' + programName);
	} else {
		defaults.program = programName[0];
	}
	return defaults;
};


// print available flags
function print_usage() {
	console.log('Usage: amberc [-l lib1,lib2...] [-i init_file] [-m main_class] [-M main_file]');
	console.log('          [-o] [-O|-A] [-d] [-s suffix] [-S suffix] [file1 [file2 ...]] [Program]');
	console.log('');
	console.log('   amberc compiles Amber files - either separately or into a complete runnable');
	console.log('   program. If no .st files are listed only a linking stage is performed.');
	console.log('   Files listed will be handled using the following rules:');
	console.log('');
	console.log('   *.js');
	console.log('     Files are linked (concatenated) in listed order.');
	console.log('     If not found we look in $AMBER/js/');
	console.log('');
	console.log('   *.st');
	console.log('     Files are compiled into .js files before concatenation.');
	console.log('     If not found we look in $AMBER/st/.');
	console.log('');
	console.log('     NOTE: Each .st file is currently considered to be a fileout of a single class');
	console.log('     category of the same name as the file!');
	console.log('');
	console.log('   If no <Program> is specified each given .st file will be compiled into');
	console.log('   a matching .js file. Otherwise a <Program>.js file is linked together based on');
	console.log('   the given options:');
	console.log('  -l library1,library2');
	console.log('     Add listed JavaScript libraries in listed order.');
	console.log('     Libraries are not separated by spaces or end with .js.');
	console.log('');
	console.log('  -i init_file');
	console.log('     Add library initializer <init_file> instead of default $AMBER/js/init.js ');
	console.log('');
	console.log('  -m main_class');
	console.log('     Add a call to the class method main_class>>main at the end of <Program>.');
	console.log('');
	console.log('  -M main_file');
	console.log('     Add <main_file> at the end of <Program.js> acting as #main.');
	console.log('');
	console.log('  -o');
	console.log('     Optimize each .js file using the Google closure compiler.');
	console.log('     Using Closure compiler found at ~/compiler.jar');
	console.log('');
	console.log('  -O');
	console.log('     Optimize final <Program>.js using the Google closure compiler.');
	console.log('     Using Closure compiler found at ~/compiler.jar');
	console.log('');
	console.log('  -A Same as -O but use --compilation_level ADVANCED_OPTIMIZATIONS');
	console.log('');
	console.log('  -d');
	console.log('     Additionally export code for deploy - stripped from source etc.');
	console.log('     Uses suffix ".deploy.js" in addition to any explicit suffic set by -s.');
	console.log('');
	console.log('  -D');
	console.log('     Specifies the output directory for all generated .js files.');
	console.log('     The hierarchy of the input files is not maintaned.');
	console.log('     If this option is omitted all generated .js files are placed next to their input files');
	console.log('');
	console.log('  -s suffix');
	console.log('     Add <suffix> to compiled .js files. File.st is then compiled into');
	console.log('     File.<suffix>.js.');
	console.log('');
	console.log('  -S suffix');
	console.log('     Use <suffix> for all libraries accessed using -l. This makes it possible');
	console.log('     to have multiple flavors of Amber and libraries in the same place.');
	console.log('');
	console.log('');
	console.log('     Example invocations:');
	console.log('');
	console.log('     Just compile Kernel-Objects.st to Kernel-Objects.js:');
	console.log('');
	console.log('        amberc Kernel-Objects.st');
	console.log('');
	console.log('     Compile Hello.st to Hello.js and create complete program called Program.js.');
	console.log('     Additionally add a call to the class method Hello>>main:');
	console.log('');
	console.log('        amberc -m Hello Hello.st Program');
	console.log('');
	console.log('     Compile Cat1.st and Cat2.st files into corresponding .js files.');
	console.log('     Link them with myboot.js and myKernel.js and add myinit.js as custom');
	console.log('     initializer file. Add main.js last which contains the startup code');
	console.log('      and merge everything into a complete program named Program.js:');
	console.log('');
	console.log('        amberc -M main.js -i myinit.js myboot.js myKernel.js Cat1.st Cat2.st Program');
};