var gulp = require('gulp');
var execFile = require('child_process').execFile;
var glob = require('glob');

function exec(command, cb) {
  execFile('sh', ['-c', command], cb);
}

var protoc = process.env.PROTOC || '../src/protoc';

var wellKnownTypes = [
  '../src/google/protobuf/any.proto',
  '../src/google/protobuf/api.proto',
  '../src/google/protobuf/compiler/plugin.proto',
  '../src/google/protobuf/descriptor.proto',
  '../src/google/protobuf/duration.proto',
  '../src/google/protobuf/empty.proto',
  '../src/google/protobuf/field_mask.proto',
  '../src/google/protobuf/source_context.proto',
  '../src/google/protobuf/struct.proto',
  '../src/google/protobuf/timestamp.proto',
  '../src/google/protobuf/type.proto',
  '../src/google/protobuf/wrappers.proto',
];

gulp.task('genproto_closure', function (cb) {
  exec(protoc + ' --js_out=library=testproto_libs,binary:.  -I ../src -I . *.proto && ' + protoc + ' --js_out=one_output_file_per_input_file,binary:. -I ../src -I . ' + wellKnownTypes.join(' '),
       function (err, stdout, stderr) {
    console.log(stdout);
    console.log(stderr);
    cb(err);
  });
});

gulp.task('genproto_commonjs', function (cb) {
  exec('mkdir -p commonjs_out && ' + protoc + ' --js_out=import_style=commonjs,binary:commonjs_out -I ../src -I commonjs -I . *.proto commonjs/test*/*.proto ' + wellKnownTypes.join(' '),
       function (err, stdout, stderr) {
    console.log(stdout);
    console.log(stderr);
    cb(err);
  });
});

gulp.task('genproto_commonjs_wellknowntypes', function (cb) {
  exec('mkdir -p commonjs_out/node_modules/google-protobuf && ' + protoc + ' --js_out=import_style=commonjs,binary:commonjs_out/node_modules/google-protobuf -I ../src ' + wellKnownTypes.join(' '),
       function (err, stdout, stderr) {
    console.log(stdout);
    console.log(stderr);
    cb(err);
  });
});

gulp.task('genproto_wellknowntypes', function (cb) {
  exec(protoc + ' --js_out=import_style=commonjs,binary:. -I ../src ' + wellKnownTypes.join(' '),
       function (err, stdout, stderr) {
    console.log(stdout);
    console.log(stderr);
    cb(err);
  });
});

function getClosureBuilderCommand(exportsFile, outputFile) {
  return './node_modules/google-closure-library/closure/bin/build/closurebuilder.py ' +
  '--root node_modules ' +
  '-o compiled ' +
  '--compiler_jar node_modules/google-closure-compiler/compiler.jar ' +
  '-i ' + exportsFile + ' ' +
  'map.js message.js binary/arith.js binary/constants.js binary/decoder.js ' +
  'binary/encoder.js binary/reader.js binary/utils.js binary/writer.js ' +
  exportsFile  + ' > ' + outputFile;
}

gulp.task('dist', ['genproto_wellknowntypes'], function (cb) {
  // TODO(haberman): minify this more aggressively.
  // Will require proper externs/exports.
  exec(getClosureBuilderCommand('commonjs/export.js', 'google-protobuf.js'),
       function (err, stdout, stderr) {
    console.log(stdout);
    console.log(stderr);
    cb(err);
  });
});

gulp.task('commonjs_asserts', function (cb) {
  exec('mkdir -p commonjs_out/test_node_modules && ' +
       getClosureBuilderCommand(
           'commonjs/export_asserts.js',
           'commonjs_out/test_node_modules/closure_asserts_commonjs.js'),
       function (err, stdout, stderr) {
    console.log(stdout);
    console.log(stderr);
    cb(err);
  });
});

gulp.task('commonjs_testdeps', function (cb) {
  exec('mkdir -p commonjs_out/test_node_modules && ' +
       getClosureBuilderCommand(
           'commonjs/export_testdeps.js',
           'commonjs_out/test_node_modules/testdeps_commonjs.js'),
       function (err, stdout, stderr) {
    console.log(stdout);
    console.log(stderr);
    cb(err);
  });
});

gulp.task('make_commonjs_out', ['dist', 'genproto_commonjs', 'genproto_commonjs_wellknowntypes', 'commonjs_asserts', 'commonjs_testdeps'], function (cb) {
  // TODO(haberman): minify this more aggressively.
  // Will require proper externs/exports.
  var cmd = "mkdir -p commonjs_out/binary && mkdir -p commonjs_out/test_node_modules && ";
  function addTestFile(file) {
    cmd += 'node commonjs/rewrite_tests_for_commonjs.js < ' + file +
           ' > commonjs_out/' + file + '&& ';
  }

  glob.sync('*_test.js').forEach(addTestFile);
  glob.sync('binary/*_test.js').forEach(addTestFile);

  exec(cmd +
       'cp commonjs/jasmine.json commonjs_out/jasmine.json && ' +
       'cp google-protobuf.js commonjs_out/test_node_modules && ' +
       'cp commonjs/import_test.js commonjs_out/import_test.js',
       function (err, stdout, stderr) {
    console.log(stdout);
    console.log(stderr);
    cb(err);
  });
});

gulp.task('deps', ['genproto_closure'], function (cb) {
  exec('./node_modules/google-closure-library/closure/bin/build/depswriter.py *.js binary/*.js > deps.js',
       function (err, stdout, stderr) {
    console.log(stdout);
    console.log(stderr);
    cb(err);
  });
});

gulp.task('test_closure', ['genproto_closure', 'deps'], function (cb) {
  exec('JASMINE_CONFIG_PATH=jasmine.json ./node_modules/.bin/jasmine',
       function (err, stdout, stderr) {
    console.log(stdout);
    console.log(stderr);
    cb(err);
  });
});

gulp.task('test_commonjs', ['make_commonjs_out'], function (cb) {
  exec('cd commonjs_out && JASMINE_CONFIG_PATH=jasmine.json NODE_PATH=test_node_modules ../node_modules/.bin/jasmine',
       function (err, stdout, stderr) {
    console.log(stdout);
    console.log(stderr);
    cb(err);
  });
});

gulp.task('test', ['test_closure', 'test_commonjs'], function(cb) {
  cb();
});