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var common = require('./common');
var fs = require('fs');

common.register('cat', _cat, {
  canReceivePipe: true,
  cmdOptions: {
    'n': 'number',
  },
});

//@
//@ ### cat([options,] file [, file ...])
//@ ### cat([options,] file_array)
//@
//@ Available options:
//@
//@ + `-n`: number all output lines
//@
//@ Examples:
//@
//@ ```javascript
//@ var str = cat('file*.txt');
//@ var str = cat('file1', 'file2');
//@ var str = cat(['file1', 'file2']); // same as above
//@ ```
//@
//@ Returns a string containing the given file, or a concatenated string
//@ containing the files if more than one file is given (a new line character is
//@ introduced between each file).
function _cat(options, files) {
  var cat = common.readFromPipe();

  if (!files && !cat) common.error('no paths given');

  files = [].slice.call(arguments, 1);

  files.forEach(function (file) {
    if (!fs.existsSync(file)) {
      common.error('no such file or directory: ' + file);
    } else if (common.statFollowLinks(file).isDirectory()) {
      common.error(file + ': Is a directory');
    }

    cat += fs.readFileSync(file, 'utf8');
  });

  if (options.number) {
    cat = addNumbers(cat);
  }

  return cat;
}
module.exports = _cat;

function addNumbers(cat) {
  var lines = cat.split('\n');
  var lastLine = lines.pop();

  lines = lines.map(function (line, i) {
    return numberedLine(i + 1, line);
  });

  if (lastLine.length) {
    lastLine = numberedLine(lines.length + 1, lastLine);
  }
  lines.push(lastLine);

  return lines.join('\n');
}

function numberedLine(n, line) {
  // GNU cat use six pad start number + tab. See http://lingrok.org/xref/coreutils/src/cat.c#57
  // https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/padStart
  var number = ('     ' + n).slice(-6) + '\t';
  return number + line;
}