var gulp = require('gulp');
var gutil = require('gulp-util');
var watch = require('gulp-watch');
var plumber = require('gulp-plumber');
var filelog = require('gulp-filelog');
var cleanDest = require('gulp-clean-dest');
var concat = require('gulp-concat');
var uglify = require('gulp-uglify');
var rename = require('gulp-rename');
var webpack = require('webpack');
var eslint = require('gulp-eslint');
var map = require('map-stream');
var bump = require('gulp-bump');
var react = require('gulp-react');
var flow = require('gulp-flowtype');
var argv = require('yargs').argv;
//var header = require('gulp-header');

var pkg = require('./package.json');

var banner = '/*! <%= pkg.name %> - v<%= pkg.version %> - '
+ '<%= new Date().toISOString() %>\n'
+ '<%= pkg.homepage ? "* " + pkg.homepage + "\n" : "" %>'
+ '* Copyright (c) <%= new Date().getFullYear() %> <%= pkg.author.name %>;'
+ ' Licensed <%= pkg.license %> */'

var sjclSrc = [
  'src/js/sjcl/core/sjcl.js',
  'src/js/sjcl/core/aes.js',
  'src/js/sjcl/core/bitArray.js',
  'src/js/sjcl/core/codecString.js',
  'src/js/sjcl/core/codecHex.js',
  'src/js/sjcl/core/codecBase64.js',
  'src/js/sjcl/core/codecBytes.js',
  'src/js/sjcl/core/sha256.js',
  'src/js/sjcl/core/sha512.js',
  'src/js/sjcl/core/sha1.js',
  'src/js/sjcl/core/ccm.js',
  // 'src/js/sjcl/core/cbc.js',
  // 'src/js/sjcl/core/ocb2.js',
  'src/js/sjcl/core/hmac.js',
  'src/js/sjcl/core/pbkdf2.js',
  'src/js/sjcl/core/random.js',
  'src/js/sjcl/core/convenience.js',
  'src/js/sjcl/core/bn.js',
  'src/js/sjcl/core/ecc.js',
  'src/js/sjcl/core/srp.js',
  'src/js/sjcl-custom/sjcl-ecc-pointextras.js',
  'src/js/sjcl-custom/sjcl-secp256k1.js',
  'src/js/sjcl-custom/sjcl-ripemd160.js',
  'src/js/sjcl-custom/sjcl-extramath.js',
  'src/js/sjcl-custom/sjcl-montgomery.js',
  'src/js/sjcl-custom/sjcl-validecc.js',
  'src/js/sjcl-custom/sjcl-ecdsa-canonical.js',
  'src/js/sjcl-custom/sjcl-ecdsa-der.js',
  'src/js/sjcl-custom/sjcl-ecdsa-recoverablepublickey.js',
  'src/js/sjcl-custom/sjcl-jacobi.js'
];

function logPluginError(error) {
  gutil.log(error.toString());
}

gulp.task('concat-sjcl', function() {
  return gulp.src(sjclSrc)
  .pipe(concat('sjcl.js'))
  .pipe(gulp.dest('./build/'));
});

gulp.task('build', [ 'concat-sjcl' ], function(callback) {
  webpack({
    cache: true,
    entry: './src/js/ripple/index.js',
    output: {
      library: 'ripple',
      path: './build/',
      filename: [ 'ripple-', '.js' ].join(pkg.version)
    },
  }, callback);
});

gulp.task('build-min', [ 'build' ], function(callback) {
  return gulp.src([ './build/ripple-', '.js' ].join(pkg.version))
  .pipe(uglify())
  .pipe(rename([ 'ripple-', '-min.js' ].join(pkg.version)))
  .pipe(gulp.dest('./build/'));
});

gulp.task('build-debug', [ 'concat-sjcl' ], function(callback) {
  webpack({
    cache: true,
    entry: './src/js/ripple/index.js',
    output: {
      library: 'ripple',
      path: './build/',
      filename: [ 'ripple-', '-debug.js' ].join(pkg.version)
    },
    debug: true,
    devtool: 'eval'
  }, callback);
});

/**
 * Generate a WebPack external for a given unavailable module which replaces
 * that module's constructor with an error-thrower
 */

function buildUseError(cons) {
  return 'var {<CONS>:function(){throw new Error("Class is unavailable in this build: <CONS>")}}'
  .replace(new RegExp('<CONS>', 'g'), cons);
};

gulp.task('build-core', [ 'concat-sjcl' ], function(callback) {
  webpack({
    entry: [
      './src/js/ripple/remote.js'
    ],
    externals: [
      {
        './transaction': buildUseError('Transaction'),
        './orderbook': buildUseError('OrderBook'),
        './account': buildUseError('Account'),
        './serializedobject': buildUseError('SerializedObject')
      }
    ],
    output: {
      library: 'ripple',
      path: './build/',
      filename: [ 'ripple-', '-core.js' ].join(pkg.version)
    },
    plugins: [
      new webpack.optimize.UglifyJsPlugin()
    ]
  }, callback);
});

gulp.task('bower-build', [ 'build' ], function(callback) {
  return gulp.src([ './build/ripple-', '.js' ].join(pkg.version))
  .pipe(rename('ripple.js'))
  .pipe(gulp.dest('./dist/'));
});

gulp.task('bower-build-min', [ 'build-min' ], function(callback) {
  return gulp.src([ './build/ripple-', '-min.js' ].join(pkg.version))
  .pipe(rename('ripple-min.js'))
  .pipe(gulp.dest('./dist/'));
});

gulp.task('bower-build-debug', [ 'build-debug' ], function(callback) {
  return gulp.src([ './build/ripple-', '-debug.js' ].join(pkg.version))
  .pipe(rename('ripple-debug.js'))
  .pipe(gulp.dest('./dist/'));
});

gulp.task('bower-version', function() {
  gulp.src('./dist/bower.json')
  .pipe(bump({ version: pkg.version }))
  .pipe(gulp.dest('./dist/'));
});

gulp.task('bower', ['bower-build', 'bower-build-min', 'bower-build-debug', 'bower-version']);

gulp.task('lint', function() {
  return gulp.src('src/js/ripple/*.js')
  .pipe(eslint({ reset: true, configFile: './eslint.json' }))
  .pipe(eslint.format());
});

gulp.task('watch', function() {
  gulp.watch('src/js/ripple/*', [ 'build-debug' ]);
});

// To use this, each javascript file must have /* @flow */ on the first line
gulp.task('typecheck', function() {
  return gulp.src('src/js/ripple/*.js')
  .pipe(flow({      // note: do not set the 'all' option, it is broken
    weak: true,   // remove this after all errors are addressed
    killFlow: true
  }));
});

gulp.task('strip', function() {
  return gulp.src('src/js/ripple/*.js')
  .pipe(watch('src/js/ripple/*.js'))
  .pipe(cleanDest('out'))   // delete outdated output file before stripping
  .pipe(plumber())        // prevent an error in one file from ending build
  .pipe(react({ stripTypes: true }).on('error', logPluginError))
  .pipe(filelog())
  .pipe(gulp.dest('out'));
});

gulp.task('version-bump', function() {
  if (!argv.type) {
    throw new Error("No type found, pass it in using the --type argument");
  }

  gulp.src('./package.json')
  .pipe(bump({ type: argv.type }))
  .pipe(gulp.dest('./'));
});

gulp.task('version-beta', function() {
  gulp.src('./package.json')
  .pipe(bump({ version: pkg.version + '-beta' }))
  .pipe(gulp.dest('./'));
});

gulp.task('default', [ 'concat-sjcl', 'build', 'build-debug', 'build-min' ]);