var gulp = require('gulp'),
  exec = require('child_process').exec,
  async = require('async'),
  release = require('github-release'),
  rename = require('gulp-rename'),
  keepup = require('keepup');

// Delete crap we don't need, which ends up saving several megabytes.
function cleanup(cb){
  var tasks = [],
    blobs = '{test*,doc*,example*,bench*,image*,tool*,lcov-report*}',
    paths = [
      './node_modules/**/' + blobs,
      './node_modules/**/node_modules/**/' + blobs,
      './node_modules/**/node_modules/**/node_modules/**/' + blobs,
      './node_modules/**/node_modules/.bin',
      './node_modules/**/node_modules/**/node_modules/.bin'
    ];

  tasks = paths.map(function(p){
    return function(done){
      exec('rm -rf ' + p, done);
    };
  });
  tasks.push(function(done){exec('npm dedupe', done);});
  async.parallel(tasks, cb);
}

gulp.task('dist', function(cb){
  cleanup(function(){
    console.log('  → creating binaries for distribution');
    keepup('./node_modules/.bin/lone ')
      .on('data', function(buf){process.stdout.write(buf);})
      .on('stderr', function(buf){process.stderr.write(buf);})
      .on('complete', function(){
        var finalName = pkg.name + '_' + platform;
        if(platform === 'windows') finalName += '.exe';

        console.log('  ✔︎ Binary created: ' + path.resolve(
          __dirname + '/../dist/' + finalName));

        console.log('  → uploading release to github');

        gulp.src('./.lone/dist/' + pkg.name)
          .pipe(rename(finalName))
          .pipe(release(pkg))
          .on('end', function(){
            console.log('  ✔︎ Dist complete and uploaded to github');
            cb();
          });
      })
      .on('crash', function(data){
        console.log('  ✘ Binary build failed.  Check logs.  (exit code '+data.code+')');
        cb(new Error('Binary build failed.  Check logs.  (exit code '+data.code+')'));
      });
  });
});