#!/usr/bin/env node

var  fs = require('fs')
	,path = require('path')
	,uglify = require('uglify-js')
	,cli = require('commander')
	,vash = require('../index')

function prefix(tplStr, options){

	if( options.targetNamespace ){

		tplStr = options.targetNamespace
			+ '["'
				+ ( options.propertyName || options.file.replace(/\/|\\/g, options.separator) )
			+ '"]=' + tplStr;

		// ensure the simple namespace exists
		var accum = '';
		options.targetNamespace.split('.').reduce(function(all, prop, i){

			accum += all + prop + ' = ' + all + prop + ' || {};\n';
			all += prop;
			return all + '.';

		}, '')

		tplStr = accum + tplStr;
	}

	return tplStr;
}

function ugly(tplStr, options){

	var  ast
		,jsp = uglify.parser
		,pro = uglify.uglify;

	if( options.uglify ){
		ast = jsp.parse(tplStr);
		ast = pro.ast_mangle(ast);
		ast = pro.ast_squeeze(ast);
		tplStr = pro.gen_code(ast);
	}

	return tplStr;
}

function render(tpl, options){
	var model = {};

	if( options.render ){

		try {
			model = JSON.parse( options.render );
		} catch(e) {
			try {
				model = JSON.parse(fs.readFileSync(options.render));
			} catch(e) {

			}
		}

		return tpl(model);
	}

	return tpl;
}

function stdin(options){
	var buffer = ''
	process.stdin.resume();
	process.stdin.setEncoding('utf8');

	process.stdin.on('data', function(chunk){
		buffer += chunk;
	})

	process.stdin.on('end', function(){
		var tpl = vash[options.helper ? 'compileHelper' : 'compile'](buffer, options.vopts);

		if( options.render ){
			tpl = render(tpl, options);
		} else {
			tpl = prefix( options.autolink
				? tpl.toClientString()
				: tpl.toString(), options);
			tpl = ugly(tpl, options);
		}

		process.stdout.write(tpl);
	})
}

function file(filepath, options){
	var contents = fs.readFileSync( filepath, 'utf8' )
		,tpl = vash[options.helper ? 'compileHelper' : 'compile'](contents, options.vopts)
		,outpath = path.join(
			options.out
			,path.join(
				path.dirname(filepath)
				,path.basename(filepath) + '.js'
			).replace(/\/|\\/g, options.separator)
		)

	if( options.render ){
		tpl = render(tpl, options);
	} else {
		tpl = prefix( options.autolink
			? tpl.toClientString()
			: tpl.toString(), options);
		tpl = ugly(tpl, options);
	}

	if( options.out ) {
		fs.writeFile( outpath, tpl.toString(), 'utf8', function(err){
			if(err){ process.stderr.write( err ) }
		} )
	} else {
		process.stdout.write(tpl.toString());
	}
}

// TODO: if passed a directory, recursively traverse

cli.on('--help', function(){
	console.log('  Examples:');
	console.log('');
	console.log('    $ echo \'<p>Hello!</p>\' | vash --json \'{ "debug": false }\' -t myapp.tplcache -p hello');
	console.log('');
	console.log('    > myapp = myapp || {};');
	console.log('    > myapp.tplcache = myapp.tplcache || {};');
	console.log('    > myapp.tplcache["hello"]=vash.link( function anonymous(model,html) {');
	console.log('    > html.buffer.push(\'<p></p>\\n\'); ');
	console.log('    > return html.buffer.flush(); ');
	console.log('    > } )');
	console.log('');
	console.log('  Remember to include vash-runtime.js if precompiling for client-side usage.')
	console.log('');
});

cli
	.option('-t, --target-namespace <namespace>', 'Assign template to a <namespace>. Recommended is `vash.helpers.tplcache` for view engine compatibility')
	.option('-p, --property-name [name]', 'Assign template to property named <name>. Defaults to filename, and requires --target-namespace.')
	.option('-f, --file <file>', 'Compile the template in <file>')
	.option('-j, --json <json>', 'Pass options to the Vash compiler. See docs for valid options.')
	.option('-o, --out <path>', 'Write template into <path> directory')
	.option('-u, --uglify', 'Uglify the template, safely')
	.option('-a, --no-autolink', 'Do not wrap each template in `vash.link`.')
	//.option('-d, --prepend-runtime', 'Include the required Vash runtime')
	.option('-r, --render [json]', 'Render the template using <json> as the model. If <json> is not valid json, assume a filename and load those contents as json.')
	.option('-s, --separator [separator]', 'Templates are auto-named by concatenating the file path with [separator]', '/')
	.option('--helper', 'Assume the input is a to-be-compiled helper')
	.option('--helpers <file>', 'Execute these compiled helpers')
	.parse(process.argv)

if( cli.json ){
	cli.vopts = JSON.parse(cli.json);
}

// helpers via .toClientString, therefore vash.link
if( cli.helpers ){
	eval(fs.readFileSync(cli.helpers, 'utf8'));
}

if(cli.file){
	cli.file = path.normalize( cli.file )
	// assume file input
	file( cli.file, cli )
} else {
	// assume stdin
	stdin( cli );
}