#!/usr/bin/env node

/**
 * Module dependencies.
 */

var fs = require('fs')
  , stylus = require('../lib/stylus')
  , basename = require('path').basename
  , dirname = require('path').dirname
  , extname = require('path').extname
  , resolve = require('path').resolve
  , join = require('path').join
  , isWindows = process.platform === 'win32';

/**
 * Arguments.
 */

var args = process.argv.slice(2);

/**
 * Compare flag.
 */

var compare = false;

/**
 * Compress flag.
 */

var compress = false;

/**
 * CSS conversion flag.
 */

var convertCSS = false;

/**
 * Line numbers flag.
 */

var linenos = false;

/**
 * CSS class prefix.
 */
var prefix = '';

/**
 * Print to stdout flag.
 */
var print = false;

/**
 * Firebug flag
 */

var firebug = false;

/**
 * Sourcemap flag
 */

var sourcemap = false;

/**
 * Files to processes.
 */

var files = [];

/**
 * Import paths.
 */

var paths = [];

/**
 * Destination directory.
 */

var dest;

/**
 * Watcher hash.
 */

var watchers;

/**
 * Enable REPL.
 */

var interactive;

/**
 * Plugins.
 */

var plugins = [];

/**
 * Optional url() function.
 */

var urlFunction = false;

/**
 * Include CSS on import.
 */

var includeCSS = false;

/**
 * Set file imports.
 */

var imports = [];

/**
 * Resolve relative urls
 */

var resolveURL = false;

/**
 * Disable cache.
 */

var disableCache = false;

/**
 * Display dependencies flag.
 */

var deps = false;

/**
 * Hoist at-rules.
 */

var hoist = false;

/**
 * Usage docs.
 */

var usage = [
    ''
  , '  Usage: stylus [options] [command] [< in [> out]]'
  , '                [file|dir ...]'
  , ''
  , '  Commands:'
  , ''
  , '    help [<type>:]<prop> Opens help info at MDN for <prop> in'
  , '                         your default browser. Optionally'
  , '                         searches other resources of <type>:'
  , '                         safari opera w3c ms caniuse quirksmode'
  , ''
  , '  Options:'
  , ''
  , '    -i, --interactive       Start interactive REPL'
  , '    -u, --use <path>        Utilize the Stylus plugin at <path>'
  , '    -U, --inline            Utilize image inlining via data URI support'
  , '    -w, --watch             Watch file(s) for changes and re-compile'
  , '    -o, --out <dir>         Output to <dir> when passing files'
  , '    -C, --css <src> [dest]  Convert CSS input to Stylus'
  , '    -I, --include <path>    Add <path> to lookup paths'
  , '    -c, --compress          Compress CSS output'
  , '    -d, --compare           Display input along with output'
  , '    -f, --firebug           Emits debug infos in the generated CSS that'
  , '                            can be used by the FireStylus Firebug plugin'
  , '    -l, --line-numbers      Emits comments in the generated CSS'
  , '                            indicating the corresponding Stylus line'
  , '    -m, --sourcemap         Generates a sourcemap in sourcemaps v3 format'
  , '    --sourcemap-inline      Inlines sourcemap with full source text in base64 format'
  , '    --sourcemap-root <url>  "sourceRoot" property of the generated sourcemap'
  , '    --sourcemap-base <path> Base <path> from which sourcemap and all sources are relative'
  , '    -P, --prefix [prefix]   prefix all css classes'
  , '    -p, --print             Print out the compiled CSS'
  , '    --import <file>         Import stylus <file>'
  , '    --include-css           Include regular CSS on @import'
  , '    -D, --deps              Display dependencies of the compiled file'
  , '    --disable-cache         Disable caching'
  , '    --hoist-atrules         Move @import and @charset to the top'
  , '    -r, --resolve-url       Resolve relative urls inside imports'
  , '    --resolve-url-nocheck   Like --resolve-url but without file existence check'
  , '    -V, --version           Display the version of Stylus'
  , '    -h, --help              Display help information'
  , ''
].join('\n');

/**
 * Handle arguments.
 */

var arg;
while (args.length) {
  arg = args.shift();
  switch (arg) {
    case '-h':
    case '--help':
      console.error(usage);
      return;
    case '-d':
    case '--compare':
      compare = true;
      break;
    case '-c':
    case '--compress':
      compress = true;
      break;
    case '-C':
    case '--css':
      convertCSS = true;
      break;
    case '-f':
    case '--firebug':
      firebug = true;
      break;
    case '-l':
    case '--line-numbers':
      linenos = true;
      break;
    case '-m':
    case '--sourcemap':
      sourcemap = {};
      break;
    case '--sourcemap-inline':
      sourcemap = sourcemap || {};
      sourcemap.inline = true;
      break;
    case '--sourcemap-root':
      var url = args.shift();
      if (!url) throw new Error('--sourcemap-root <url> required');
      sourcemap = sourcemap || {};
      sourcemap.sourceRoot = url;
      break;
    case '--sourcemap-base':
      var path = args.shift();
      if (!path) throw new Error('--sourcemap-base <path> required');
      sourcemap = sourcemap || {};
      sourcemap.basePath = path;
      break;
    case '-P':
    case '--prefix':
      prefix = args.shift();
      if (!prefix) throw new Error('--prefix <prefix> required');
      break;
    case '-p':
    case '--print':
      print = true;
      break;
    case '-V':
    case '--version':
      console.log(stylus.version);
      return;
    case '-o':
    case '--out':
      dest = args.shift();
      if (!dest) throw new Error('--out <dir> required');
      break;
    case 'help':
      var name = args.shift()
        , browser = name.split(':');
      if (browser.length > 1) {
        name = [].slice.call(browser, 1).join(':');
        browser = browser[0];
      } else {
        name = browser[0];
        browser = '';
      }
      if (!name) throw new Error('help <property> required');
      help(name);
      break;
    case '--include-css':
      includeCSS = true;
      break;
    case '--disable-cache':
      disableCache = true;
      break;
    case '--hoist-atrules':
      hoist = true;
      break;
    case '-i':
    case '--repl':
    case '--interactive':
      interactive = true;
      break;
    case '-I':
    case '--include':
      var path = args.shift();
      if (!path) throw new Error('--include <path> required');
      paths.push(path);
      break;
    case '-w':
    case '--watch':
      watchers = {};
      break;
    case '-U':
    case '--inline':
      args.unshift('--use', 'url');
      break;
    case '-u':
    case '--use':
      var options;
      var path = args.shift();
      if (!path) throw new Error('--use <path> required');

      // options
      if ('--with' == args[0]) {
        args.shift();
        options = args.shift();
        if (!options) throw new Error('--with <options> required');
        options = eval('(' + options + ')');
      }

      // url support
      if ('url' == path) {
        urlFunction = options || {};
      } else {
        paths.push(dirname(path));
        plugins.push({ path: path, options: options });
      }
      break;
    case '--import':
      var file = args.shift();
      if (!file) throw new Error('--import <file> required');
      imports.push(file);
      break;
    case '-r':
    case '--resolve-url':
      resolveURL = {};
      break;
    case '--resolve-url-nocheck':
      resolveURL = { nocheck: true };
      break;
    case '-D':
    case '--deps':
      deps = true;
      break;
    default:
      files.push(arg);
  }
}

// if --watch is used, assume we are
// not working with stdio

if (watchers && !files.length) {
  files = fs.readdirSync(process.cwd())
    .filter(function(file){
    return file.match(/\.styl$/);
  });
}

// --sourcemap flag is not working with stdio
if (sourcemap && !files.length) sourcemap = false;

/**
 * Open the default browser to the CSS property `name`.
 *
 * @param {String} name
 */

function help(name) {
  var url
    , exec = require('child_process').exec
    , command;

  name = encodeURIComponent(name);

  switch (browser) {
    case 'safari':
    case 'webkit':
      url = 'https://developer.apple.com/library/safari/search/?q=' + name;
      break;
    case 'opera':
      url = 'http://dev.opera.com/search/?term=' + name;
      break;
    case 'w3c':
      url = 'http://www.google.com/search?q=site%3Awww.w3.org%2FTR+' + name;
      break;
    case 'ms':
      url = 'http://social.msdn.microsoft.com/search/en-US/ie?query=' + name + '&refinement=59%2c61';
      break;
    case 'caniuse':
      url = 'http://caniuse.com/#search=' + name;
      break;
    case 'quirksmode':
      url = 'http://www.google.com/search?q=site%3Awww.quirksmode.org+' + name;
      break;
    default:
      url = 'https://developer.mozilla.org/en/CSS/' + name;
  }

  switch (process.platform) {
    case 'linux': command = 'x-www-browser'; break;
    default: command = 'open';
  }

  exec(command + ' "' + url + '"', function(){
    process.exit(0);
  });
}

// Compilation options

if (files.length > 1 && isCSS(dest)) {
  dest = dirname(dest);
}

var options = {
    filename: 'stdin'
  , compress: compress
  , firebug: firebug
  , linenos: linenos
  , sourcemap: sourcemap
  , paths: [process.cwd()].concat(paths)
  , prefix: prefix
  , dest: dest
  , 'hoist atrules': hoist
};

// Buffer stdin

var str = '';

// Convert CSS to Stylus

if (convertCSS) {
    switch (files.length) {
    case 2:
      compileCSSFile(files[0], files[1]);
      break;
    case 1:
      var file = files[0];
      compileCSSFile(file, join(dirname(file), basename(file, extname(file))) + '.styl');
      break;
    default:
      var stdin = process.openStdin();
      stdin.setEncoding('utf8');
      stdin.on('data', function(chunk){ str += chunk; });
      stdin.on('end', function(){
        var out = stylus.convertCSS(str);
        console.log(out);
      });
  }
} else if (interactive) {
  repl();
} else if (deps) {
  // if --deps is used, just display list of the dependencies
  // not working with stdio and dirs
  displayDeps();
} else {
  if (files.length) {
    compileFiles(files);
  } else {
    compileStdio();
  }
}

/**
 * Start Stylus REPL.
 */

function repl() {
  var options = { cache: false, filename: 'stdin', imports: [join(__dirname, '..', 'lib', 'functions')] }
    , parser = new stylus.Parser('', options)
    , evaluator = new stylus.Evaluator(parser.parse(), options)
    , rl = require('readline')
    , repl = rl.createInterface(process.stdin, process.stdout, autocomplete)
    , global = evaluator.global.scope;

  // expose BIFs
  evaluator.evaluate();

  // readline
  repl.setPrompt('> ');
  repl.prompt();

  // HACK: flat-list auto-complete
  function autocomplete(line){
    var out = process.stdout
      , keys = Object.keys(global.locals)
      , len = keys.length
      , words = line.split(/\s+/)
      , word = words.pop()
      , names = []
      , name
      , node
      , key;

    // find words that match
    for (var i = 0; i < len; ++i) {
      key = keys[i];
      if (0 == key.indexOf(word)) {
        node = global.lookup(key);
        switch (node.nodeName) {
          case 'function':
            names.push(node.toString());
            break;
          default:
            names.push(key);
        }
      }
    }

    return [names, line];
  };

  repl.on('line', function(line){
    if (!line.trim().length) return repl.prompt();
    parser = new stylus.Parser(line, options);
    parser.state.push('expression');
    evaluator.return = true;
    try {
      var expr = parser.parse();
      evaluator.root = expr;
      var ret = evaluator.evaluate();
      var node;
      while (node = ret.nodes.pop()) {
        if (!node.suppress) {
          var str = node.toString();
          if ('(' == str[0]) str = str.replace(/^\(|\)$/g, '');
          console.log('\033[90m=> \033[0m' + highlight(str));
          break;
        }
      }
      repl.prompt();
    } catch (err) {
      console.error('\033[31merror: %s\033[0m', err.message || err.stack);
      repl.prompt();
    }
  });

  repl.on('SIGINT', function(){
    console.log();
    process.exit(0);
  });
}

/**
 * Highlight the given string of Stylus.
 */

function highlight(str) {
  return str
    .replace(/(#)?(\d+(\.\d+)?)/g, function($0, $1, $2){
      return $1 ? $0 : '\033[36m' + $2 + '\033[0m';
    })
    .replace(/(#[\da-fA-F]+)/g, '\033[33m$1\033[0m')
    .replace(/('.*?'|".*?")/g, '\033[32m$1\033[0m');
}

/**
 * Convert a CSS file to a Styl file
 */

function compileCSSFile(file, fileOut) {
  fs.stat(file, function(err, stat){
    if (err) throw err;
    if (stat.isFile()) {
      fs.readFile(file, 'utf8', function(err, str){
        if (err) throw err;
        var styl = stylus.convertCSS(str);
        fs.writeFile(fileOut, styl, function(err){
         if (err) throw err;
        });
      });
    }
  });
}

/**
 * Compile with stdio.
 */

function compileStdio() {
  process.stdin.setEncoding('utf8');
  process.stdin.on('data', function(chunk){ str += chunk; });
  process.stdin.on('end', function(){
    // Compile to css
    var style = stylus(str, options);
    if (includeCSS) style.set('include css', true);
    if (disableCache) style.set('cache', false);
    usePlugins(style);
    importFiles(style);
    style.render(function(err, css){
      if (err) throw err;
      if (compare) {
        console.log('\n\x1b[1mInput:\x1b[0m');
        console.log(str);
        console.log('\n\x1b[1mOutput:\x1b[0m');
      }
      console.log(css);
      if (compare) console.log();
    });
  }).resume();
}

/**
 * Compile the given files.
 */

function compileFiles(files) {
  files.forEach(compileFile);
}

/**
 * Display dependencies of the compiled files.
 */

function displayDeps() {
  files.forEach(function(file){
    // ensure file exists
    fs.stat(file, function(err, stat){
      if (err) throw err;
      fs.readFile(file, 'utf8', function(err, str){
        if (err) throw err;
        options.filename = file;
        var style = stylus(str, options);

        usePlugins(style);
        importFiles(style);
        console.log(style.deps().join('\n'));
      });
    });
  });
}

/**
 * Compile the given file.
 */

function compileFile(file) {
  // ensure file exists
  fs.stat(file, function(err, stat){
    if (err) throw err;
    // file
    if (stat.isFile()) {
      fs.readFile(file, 'utf8', function(err, str){
        if (err) throw err;
        options.filename = file;
        options._imports = [];
        var style = stylus(str, options);
        if (includeCSS) style.set('include css', true);
        if (disableCache) style.set('cache', false);
        if (sourcemap) style.set('sourcemap', sourcemap);

        usePlugins(style);
        importFiles(style);
        style.render(function(err, css){
          watchImports(file, options._imports);
          if (err) {
            if (watchers) {
              console.error(err.stack || err.message);
            } else {
              throw err;
            }
          } else {
            writeFile(file, css);
            // write sourcemap
            if (sourcemap && !sourcemap.inline) {
              writeSourcemap(file, style.sourcemap);
            }
          }
        });
      });
    // directory
    } else if (stat.isDirectory()) {
      fs.readdir(file, function(err, files){
        if (err) throw err;
        files.filter(function(path){
          return path.match(/\.styl$/);
        }).map(function(path){
          return join(file, path);
        }).forEach(compileFile);
      });
    }
  });
}

/**
 * Write the given CSS output.
 */

function createPath(file, sourceMap) {
  var out;
  if (files.length === 1 && isCSS(dest)) {
    return [dest, sourceMap ? '.map' : ''].join('');
  }
  // --out support
  out = [basename(file, extname(file)), sourceMap ? '.css.map' : '.css'].join('');
  return dest
    ? join(dest, out)
    : join(dirname(file), out);
}

/**
 * Check if the given path is a CSS file.
 */

function isCSS(file) {
  return file && '.css' === extname(file);
}

function writeFile(file, css) {
  // --print support
  if (print) return process.stdout.write(css);
  var path = createPath(file);
  fs.writeFile(path, css, function(err){
    if (err) throw err;
    console.log('  \033[90mcompiled\033[0m %s', path);
    // --watch support
    watch(file, file);
  });
}

/**
* Write the given sourcemap.
*/

function writeSourcemap(file, sourcemap) {
  var path = createPath(file, true);
  fs.writeFile(path, JSON.stringify(sourcemap), function(err){
    if (err) throw err;
    // don't output log message if --print is present
    if (!print) console.log('  \033[90mgenerated\033[0m %s', path);
  });
}

/**
 * Watch the given `file` and recompiling `rootFile` when modified.
 */

function watch(file, rootFile) {
  // not watching
  if (!watchers) return;

  // already watched
  if (watchers[file]) {
    watchers[file][rootFile] = true;
    return;
  }

  // watch the file itself
  watchers[file] = {};
  watchers[file][rootFile] = true;
  if (print) {
    console.error('Stylus CLI Error: Watch and print cannot be used together');
    process.exit(1);
  }
  console.log('  \033[90mwatching\033[0m %s', file);
  // if is windows use fs.watch api instead
  // TODO: remove watchFile when fs.watch() works on osx etc
  if (isWindows) {
    fs.watch(file, function(event) {
      if (event === 'change') compile();
    });
  } else {
    fs.watchFile(file, { interval: 300 }, function(curr, prev) {
      if (curr.mtime > prev.mtime) compile();
    });
  }

  function compile() {
    for (var rootFile in watchers[file]) {
      compileFile(rootFile);
    }
  }
}

/**
 * Watch `imports`, re-compiling `file` when they change.
 */

function watchImports(file, imports) {
  imports.forEach(function(imported){
    if (!imported.path) return;
    watch(imported.path, file);
  });
}

/**
 * Utilize plugins.
 */

function usePlugins(style) {
  plugins.forEach(function(plugin){
    var path = plugin.path;
    var options = plugin.options;
    fn = require(/^\.+\//.test(path) ? resolve(path) : path);
    if ('function' != typeof fn) {
      throw new Error('plugin ' + path + ' does not export a function');
    }
    style.use(fn(options));
  });

  if (urlFunction) {
    style.define('url', stylus.url(urlFunction));
  } else if (resolveURL) {
    style.define('url', stylus.resolver(resolveURL));
  }
}

/**
 * Imports the indicated files.
 */

function importFiles(style) {
  imports.forEach(function(file) {
    style.import(file);
  });
}