#!/usr/bin/env node

var commander = require("commander");
var readdir   = require("fs-readdir-recursive");
var mkdirp    = require("mkdirp");
var path      = require("path");
var util      = require("../lib/6to5/util");
var to5       = require("../lib/6to5/node");
var fs        = require("fs");
var _         = require("lodash");

commander.option("-m, --source-maps", "Generate source maps alongside the compiled JavaScript files. Adds sourceMappingURL directives to the JavaScript as well.");
//commander.option("-w, --watch", "Watch, only works with --out-dir");

var list = function (val) {
  return val ? val.split(",") : [];
};

commander.option("-w, --whitelist [whitelist]", "Whitelist", list);
commander.option("-b, --blacklist [blacklist]", "Blacklist", list);
commander.option("-o, --out-file [out]", "Compile all input files into a single file");
commander.option("-d, --out-dir [out]", "Compile an input directory of modules into an output directory");

var pkg = require("../package.json");
commander.version(pkg.version);
commander.usage("[options] <files ...>");
commander.parse(process.argv);

//

var errors = [];

var filenames = commander.args;
if (!filenames.length) commander.help();

_.each(filenames, function (filename) {
  if (!fs.existsSync(filename)) {
    errors.push(filename + " doesn't exist");
  }
});

if (commander.outFile && commander.outDir) {
  errors.push("cannot have --out-file and --out-dir");
}

if (errors.length) {
  console.error(errors.join(". "));
  process.exit(2);
}

//

var readdirFilter = function (filename) {
  return readdir(filename).filter(util.canCompile);
};

var mainOpts = {
  blacklist: commander.blacklist,
  whitelist: commander.whitelist,
  sourceMap: commander.sourceMaps,
  tolerant:  commander.tolerant
};

var data = [];

var compile = function (filename) {
  var opts = _.clone(mainOpts);
  opts.filename = filename;

  var file = fs.readFileSync(filename);
  return to5.transform(file, opts);
};

if (commander.outDir) {
  var write = function (src, relative) {
    var data = compile(src);

    var dest = path.join(commander.outDir, relative);

    var up = path.normalize(dest + "/..");
    mkdirp.sync(up);

    fs.writeFileSync(dest, data);

    console.log(src + " -> " + dest);
  };

  var handle = function (filename) {
    var stat = fs.statSync(filename);

    if (stat.isDirectory(filename)) {
      var dirname = filename;

      _.each(readdirFilter(dirname), function (filename) {
        write(path.join(dirname, filename), filename);
      });
    } else {
      write(filename, filename);
    }
  };

  _.each(filenames, handle);
} else {
  var data = [];

  var _filenames = filenames;
  filenames = [];

  _.each(_filenames, function (filename) {
    var stat = fs.statSync(filename);
    if (stat.isDirectory()) {
      var dirname = filename;

      _.each(readdirFilter(filename), function (filename) {
        filenames.push(path.join(dirname, filename));
      });
    } else {
      filenames.push(filename);
    }
  });

  _.each(filenames, function (filename) {
    data.push(compile(filename) + "\n");
  });

  data = data.join("");

  if (commander.outFile) {
    fs.writeFileSync(commander.out, data);
  } else {
    console.log(data);
  }
}