#!/usr/bin/env node

var util = require('util');
var fs = require('fs');
var path = require('path');
var CleanCSS = require('../index');

var commands = require('commander');

var packageConfig = fs.readFileSync(path.join(path.dirname(fs.realpathSync(process.argv[1])), '../package.json'));
var buildVersion = JSON.parse(packageConfig).version;

var isWindows = process.platform == 'win32';

// Specify commander options to parse command line params correctly
commands
  .version(buildVersion, '-v, --version')
  .usage('[options] source-file, [source-file, ...]')
  .option('-b, --keep-line-breaks', 'Keep line breaks')
  .option('--s0', 'Remove all special comments, i.e. /*! comment */')
  .option('--s1', 'Remove all special comments but the first one')
  .option('-r, --root [root-path]', 'Set a root path to which resolve absolute @import rules')
  .option('-o, --output [output-file]', 'Use [output-file] as output instead of STDOUT')
  .option('-s, --skip-import', 'Disable @import processing')
  .option('--skip-rebase', 'Disable URLs rebasing')
  .option('--skip-advanced', 'Disable advanced optimizations - selector & property merging, reduction, etc.')
  .option('--skip-aggressive-merging', 'Disable properties merging based on their order')
  .option('--rounding-precision [value]', 'Rounding precision, defaults to 2', parseInt)
  .option('-c, --compatibility [ie7|ie8]', 'Force compatibility mode')
  .option('-t, --timeout [seconds]', 'Per connection timeout when fetching remote @imports (defaults to 5 seconds)')
  .option('-d, --debug', 'Shows debug information (minification time & compression efficiency)');

commands.on('--help', function() {
  util.puts('  Examples:\n');
  util.puts('    %> cleancss one.css');
  util.puts('    %> cleancss -o one-min.css one.css');
  if (isWindows) {
    util.puts('    %> type one.css two.css three.css | cleancss -o merged-and-minified.css');
  } else {
    util.puts('    %> cat one.css two.css three.css | cleancss -o merged-and-minified.css');
    util.puts('    %> cat one.css two.css three.css | cleancss | gzip -9 -c > merged-minified-and-gzipped.css.gz');
  }
  util.puts('');
  process.exit();
});

commands.parse(process.argv);

var options = {
  sources: null,
  target: null
};
var cleanOptions = {};
var fromStdin = !process.env.__DIRECT__ && !process.stdin.isTTY;

// If no sensible data passed in just print help and exit
if (!fromStdin && commands.args.length === 0) {
  commands.outputHelp();
  return 0;
}

// Now coerce commands into CleanCSS configuration...
if (commands.output)
  cleanOptions.target = options.target = commands.output;
if (commands.keepLineBreaks)
  cleanOptions.keepBreaks = true;
if (commands.s1)
  cleanOptions.keepSpecialComments = 1;
if (commands.s0)
  cleanOptions.keepSpecialComments = 0;
if (commands.root)
  cleanOptions.root = commands.root;
if (commands.skipImport)
  cleanOptions.processImport = false;
if (commands.skipRebase)
  cleanOptions.noRebase = true;
if (commands.skipAdvanced)
  cleanOptions.noAdvanced = true;
if (commands.skipAggressiveMerging)
  cleanOptions.noAggressiveMerging = true;
if (commands.compatibility)
  cleanOptions.compatibility = commands.compatibility;
if (commands.roundingPrecision !== undefined)
  cleanOptions.roundingPrecision = commands.roundingPrecision;
if (commands.debug)
  cleanOptions.debug = true;
if (commands.timeout)
  cleanOptions.inliner = { timeout: parseFloat(commands.timeout) * 1000 };
if (commands.args.length > 0) {
  var relativeTo = (cleanOptions.noRebase ? false : cleanOptions.root) || commands.args[0];
  cleanOptions.relativeTo = path.dirname(path.resolve(relativeTo));

  options.sources = commands.args.map(function(source) {
    var isRemote = /^https?:\/\//.test(source);

    if (cleanOptions.processImport === false)
      source += '@shallow';

    return isRemote ?
      source :
      path.relative(cleanOptions.relativeTo, path.resolve(source));
  });
}

// ... and do the magic!
if (options.sources) {
  var data = options.sources
    .map(function(source) {
      return '@import url(' + source + ');';
    })
    .join('');
  minify(data);
} else {
  var stdin = process.openStdin();
  stdin.setEncoding('utf-8');
  var data = '';
  stdin.on('data', function(chunk) {
    data += chunk;
  });
  stdin.on('end', function() {
    minify(data);
  });
}

function minify(data) {
  new CleanCSS(cleanOptions).minify(data, function(errors, minified) {
    if (cleanOptions.debug) {
      console.error('Original: %d bytes', this.stats.originalSize);
      console.error('Minified: %d bytes', this.stats.minifiedSize);
      console.error('Efficiency: %d%', ~~(this.stats.efficiency * 10000) / 100.0);
      console.error('Time spent: %dms', this.stats.timeSpent);
    }

    outputFeedback(this.errors, true);
    outputFeedback(this.warnings);

    if (this.errors.length > 0)
      process.exit(1);

    output(minified);
  });
}

function output(minified) {
  if (options.target)
    fs.writeFileSync(options.target, minified, 'utf8');
  else
    process.stdout.write(minified);
}

function outputFeedback(messages, isError) {
  var prefix = isError ? '\x1B[31mERROR\x1B[39m:' : 'WARNING:';

  messages.forEach(function(message) {
    console.error('%s %s', prefix, message);
  });
}
