#!/usr/bin/env node

var version = require('../package.json').version;

function help() {
    console.log([
        'crass ' + version,
        'Usage:',
        '  crass <input file> [options]',
        '',
        'Options:',
        ' --optimize        Run optimizations on the file.',
        ' --O1              Runs optimizations with the O1 flag.',
        ' --pretty          Pretty prints the output.',
        ' --min xxx[[,xxx]] Sets browser minimum versions.',
        ' --saveie          Enables support for IE6 and below.',
        ' --css4            Allows optimizer to generate CSS 4 (may not be supported by all browsers).',
        '',
        'Browser versions:',
        ' - Must start with browser name',
        ' - Followed by version',
        ' - E.g.: chr28 ie9 fx16 op15'
    ].join('\n'));
}

var fs = require('fs');

function tryRequire(module) {
    try {
        return require('../src/' + module);
    } catch (e) {
        return require('../dist/' + module);
    }
}

var browser_support = tryRequire('browser_support');
var utils = tryRequire('utils');
var opts = utils.opts(process.argv.slice(3));

var crass = tryRequire('');

if (process.argv.length < 3) {
    help();
    process.exit(1);
}

fs.readFile(process.argv[2], function(err, data) {
    if (err) {
        console.error('Could not read file.');
        console.error(err);
        help();
        process.exit(1);
    }

    var parsed = crass.parse(data);

    var kw = {};
    if ('min' in opts) {
        var minPlatsUnparsed = opts.min.split(',');
        if (minPlatsUnparsed.length) {
            var minPlats = minPlatsUnparsed.map(browser_support.parseBrowser);
            kw.browser_min = {};
            minPlats.forEach(function(plat) {
                kw.browser_min[plat.browser] = plat.version;
            });
        }
    } else {
        kw.browser_min = {
            chrome: 39,
            firefox: 31,
            ie: 11,
            opera: 26,
        };
    }

    kw.css4 = 'css4' in opts && opts.css4;

    if (opts.optimize) {
        if (opts.o1 || opts.O1) kw.o1 = true;
        if (opts.saveie) kw.saveie = true;
        parsed = parsed.optimize(kw);
    }

    if (opts.pretty) {
        console.log(parsed.pretty());
    } else {
        console.log(parsed.toString());
    }
});