#!/usr/bin/env node

var path = require('path'),
    fs = require('fs'),
    sys = require('util'),
    os = require('os');

var less = require('../lib/less');
var args = process.argv.slice(1);
var options = {
    compress: false,
    yuicompress: false,
    optimization: 1,
    silent: false,
    paths: [],
    color: true,
    strictImports: false,
    rootpath: '',
    relativeUrls: false
};
var continueProcessing = true,
    currentErrorcode;

// calling process.exit does not flush stdout always
// so use this to set the exit code
process.on('exit', function() { process.reallyExit(currentErrorcode) });

args = args.filter(function (arg) {
    var match;

    if (match = arg.match(/^-I(.+)$/)) {
        options.paths.push(match[1]);
        return false;
    }

    if (match = arg.match(/^--?([a-z][0-9a-z-]*)(?:=([^\s]+))?$/i)) { arg = match[1] }
    else { return arg }

    switch (arg) {
        case 'v':
        case 'version':
            sys.puts("lessc " + less.version.join('.') + " (LESS Compiler) [JavaScript]");
            continueProcessing = false;
        case 'verbose':
            options.verbose = true;
            break;
        case 's':
        case 'silent':
            options.silent = true;
            break;
        case 'strict-imports':
            options.strictImports = true;
            break;
        case 'h':
        case 'help':
            require('../lib/less/lessc_helper').printUsage();
            continueProcessing = false;
        case 'x':
        case 'compress':
            options.compress = true;
            break;
        case 'yui-compress':
            options.yuicompress = true;
            break;
        case 'no-color':
            options.color = false;
            break;
        case 'include-path':
            if (!match[2]) {
                sys.puts("include-path option requires a parameter");
                continueProcessing = false;
            } else {
                options.paths = match[2].split(os.type().match(/Windows/) ? ';' : ':')
                    .map(function(p) {
                        if (p) {
                            return path.resolve(process.cwd(), p);
                        }
                    });
            }
            break;
        case 'O0': options.optimization = 0; break;
        case 'O1': options.optimization = 1; break;
        case 'O2': options.optimization = 2; break;
        case 'line-numbers':
            options.dumpLineNumbers = match[2];
            break;
        case 'rp':
        case 'rootpath':
            if (!match[2]) {
                sys.puts("rootpath option requires a parameter");
                continueProcessing = false;
            } else {
                options.rootpath = path.normalize(match[2] + '/').replace('\\', '/');
            }
            break;
        case "ru":
        case "relative-urls":
            options.relativeUrls = true;
            break;
    }
});

if (!continueProcessing) {
    return;
}

var input = args[1];
if (input && input != '-') {
    input = path.resolve(process.cwd(), input);
}
var output = args[2];
if (output) {
    output = path.resolve(process.cwd(), output);
}

if (! input) {
    sys.puts("lessc: no input files");
    sys.puts("");
    require('../lib/less/lessc_helper').printUsage();
    currentErrorcode = 1;
    return;
}

var ensureDirectory = function (filepath) {
    var dir = path.dirname(filepath),
        existsSync = fs.existsSync || path.existsSync;
    if (!existsSync(dir)) {
        fs.mkdirSync(dir);
    }
};

var parseLessFile = function (e, data) {
    if (e) {
        sys.puts("lessc: " + e.message);
        currentErrorcode = 1;
        return;
    }

    new(less.Parser)({
        paths: [path.dirname(input)].concat(options.paths),
        optimization: options.optimization,
        filename: input,
        rootpath: options.rootpath,
        relativeUrls: options.relativeUrls,
        strictImports: options.strictImports,
        dumpLineNumbers: options.dumpLineNumbers
    }).parse(data, function (err, tree) {
        if (err) {
            less.writeError(err, options);
            currentErrorcode = 1;
            return;
        } else {
            try {
                var css = tree.toCSS({
                    compress: options.compress,
                    yuicompress: options.yuicompress
                });
                if (output) {
                    ensureDirectory(output);
                    fs.writeFileSync(output, css, 'utf8');
                    if (options.verbose) {
                        console.log('lessc: wrote ' + output);
                    }
                } else {
                    sys.print(css);
                }
            } catch (e) {
                less.writeError(e, options);
                currentErrorcode = 2;
                return;
            }
        }
    });
};

if (input != '-') {
    fs.readFile(input, 'utf8', parseLessFile);
} else {
    process.stdin.resume();
    process.stdin.setEncoding('utf8');

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

    process.stdin.on('end', function() {
        parseLessFile(false, buffer);
    });
}
