#!/usr/bin/env node

var program = require('commander');
var dircompare = require('./index');
var pth = require('path');
var fs = require('fs');
var util = require('util');
var Promise = require('bluebird');
var print = require('./print');
var common = require('./common');
var pjson = require('./package.json');

program
.version(pjson.version)
.usage('[options] leftdir rightdir')
.option('-c, --compare-content', 'compare files by content')
.option('-D, --compare-date', 'compare files by date')
.option('--date-tolerance [type]', 'tolerance to be used in date comparison (milliseconds)')
.option('-f, --filter [type]', 'file name filter', undefined)
.option('-x, --exclude [type]', 'file/directory name exclude filter', undefined)
.option('-S, --skip-subdirs', 'do not recurse into subdirectories')
.option('-L, --skip-symlinks', 'ignore symlinks')
.option('-i, --ignore-case', 'ignores case when comparing file names')
.option('-l, --show-left', 'report - show entries occurring in leftdir')
.option('-r, --show-right', 'report - show entries occurring in rightdir')
.option('-e, --show-equal', 'report - show identic entries occuring in both dirs')
.option('-d, --show-distinct', 'report - show distinct entries occuring in both dirs')
.option('-a, --show-all', 'report - show all entries')
.option('-w, --whole-report', 'report - include directories in detailed report')
.option('--csv', 'report - print details as csv')
.option('--nocolors', 'don\'t use console colors')
.option('--async', 'Make use of multiple cores')
;

program.on('--help', function(){
    console.log('  By default files are compared by size.');
    console.log('  --date-tolerance defaults to 1000 ms. Two files are considered to have');
    console.log('  the same date if the difference between their modification dates fits');
    console.log('  within date tolerance.');
    console.log('');
    console.log('  Exit codes:');
    console.log('    0 - entries are identical');
    console.log('    1 - entries are different');
    console.log('    2 - error occurred');
    console.log('');
    console.log('  Examples:');
    console.log('  compare by content         dircompare -c dir1 dir2');
    console.log('  exclude filter             dircompare -x .git dir1 dir2');
    console.log('  include filter             dircompare -f *.js,*.yml dir1 dir2');
    console.log('  show only different files  dircompare -d dir1 dir2');
});

// Fix for https://github.com/tj/commander.js/issues/125
program.allowUnknownOption();
program.parse(process.argv);
var parsed = program.parseOptions(program.normalize(process.argv.slice(2)));
if (parsed.unknown.length > 0) {
	console.error('Unknown options: ' + parsed.unknown);
	process.exit(2);
}

var run = function(){
    try{
        if(program.args.length!==2){
            program.outputHelp()
            process.exit(2);
        } else{
            var options = {};


            options.compareContent = program.compareContent;
            options.compareDate = program.compareDate;
            options.compareSize = true;
            options.skipSubdirs = program.skipSubdirs;
            options.skipSymlinks = program.skipSymlinks;
            options.ignoreCase = program.ignoreCase;
            options.includeFilter = program.filter;
            options.excludeFilter = program.exclude;
            options.noDiffSet = !(program.showAll || program.showEqual || program.showLeft || program.showRight || program.showDistinct);
            options.dateTolerance = program.dateTolerance || 1000

            var async = program.async;

            var path1 = program.args[0];
            var path2 = program.args[1];
            var abort = false;
            if(!common.isNumeric(options.dateTolerance)){
                console.error("Numeric value expected for --date-tolerance");
                abort = true;
            }
            if(!fs.existsSync(path1)){
                console.error(util.format("Path '%s' missing"), path1);
                abort = true;
            }
            if(!fs.existsSync(path2)){
                console.error(util.format("path '%s' missing"), path2);
                abort = true;
            }
            if(!abort){
                // compare
            	var comparePromise;
            	if(async){
                	comparePromise = dircompare.compare(path1, path2, options);
            	} else{
                	comparePromise = new Promise(function(resolve, reject) {
                		resolve(dircompare.compareSync(path1, path2, options));
    				});
            	}

            	comparePromise.then(
						function(res){
							// PRINT DETAILS
						    print(res, process.stdout, program);
			                if(res.same){
			                    process.exit(0);
			                } else{
			                    process.exit(1);
			                }
						},
						function(error){
					        console.error('Error occurred: ' + (error instanceof Error ? error.stack : error));
					        process.exit(2);
						});
            } else{
                process.exit(2);
            }
        }
    }catch(e){
        console.error(e.stack);
        process.exit(2);
    }
}




run();