'use strict';

var destCopy = require('../broccoli-dest-copy');
var Funnel = require('broccoli-funnel');
var flatten = require('broccoli-flatten');
var htmlReplace = require('../html-replace');
var mergeTrees = require('broccoli-merge-trees');
var path = require('path');
var replace = require('broccoli-replace');
var stew = require('broccoli-stew');
var ts2dart = require('../broccoli-ts2dart');
var traceurCompiler = require('../traceur');


var projectRootDir = path.normalize(path.join(__dirname, '..', '..', '..', '..'));


module.exports = function makeBrowserTree(options, destinationPath) {
  var modulesTree = new Funnel(
      'modules',
      {include: ['**/**'], exclude: ['**/*.cjs', 'benchmarks/e2e_test/**'], destDir: '/'});

  // Use Traceur to transpile original sources to ES6
  var es6Tree = traceurCompiler(modulesTree, '.es6', '.map', {
    sourceMaps: true,
    annotations: true,      // parse annotations
    types: true,            // parse types
    script: false,          // parse as a module
    memberVariables: true,  // parse class fields
    modules: 'instantiate',
    typeAssertionModule: 'rtts_assert/rtts_assert',
    typeAssertions: options.typeAssertions,
    outputLanguage: 'es6'
  });


  // Call Traceur again to lower the ES6 build tree to ES5
  var es5Tree =
      traceurCompiler(es6Tree, '.js', '.js.map', {modules: 'instantiate', sourceMaps: true});

  // Now we add a few more files to the es6 tree that Traceur should not see
  ['angular2', 'rtts_assert'].forEach(function(destDir) {
    var extras = new Funnel('tools/build', {files: ['es5build.js'], destDir: destDir});
    es6Tree = mergeTrees([es6Tree, extras]);
  });


  var vendorScriptsTree = flatten(new Funnel('.', {
    files: [
      'node_modules/es6-module-loader/dist/es6-module-loader-sans-promises.src.js',
      'node_modules/zone.js/zone.js',
      'node_modules/zone.js/long-stack-trace-zone.js',
      'node_modules/systemjs/dist/system.src.js',
      'node_modules/systemjs/lib/extension-register.js',
      'node_modules/systemjs/lib/extension-cjs.js',
      'node_modules/rx/dist/rx.all.js',
      'tools/build/snippets/runtime_paths.js',
      path.relative(projectRootDir, traceurCompiler.RUNTIME_PATH)
    ]
  }));
  var vendorScripts_benchmark =
      new Funnel('tools/build/snippets', {files: ['url_params_to_form.js'], destDir: '/'});
  var vendorScripts_benchmarks_external =
      new Funnel('node_modules/angular', {files: ['angular.js'], destDir: '/'});

  var servingTrees = [];

  function copyVendorScriptsTo(destDir) {
    servingTrees.push(new Funnel(vendorScriptsTree, {srcDir: '/', destDir: destDir}));
    if (destDir.indexOf('benchmarks') > -1) {
      servingTrees.push(new Funnel(vendorScripts_benchmark, {srcDir: '/', destDir: destDir}));
    }
    if (destDir.indexOf('benchmarks_external') > -1) {
      servingTrees.push(
          new Funnel(vendorScripts_benchmarks_external, {srcDir: '/', destDir: destDir}));
    }
  }

  function writeScriptsForPath(relativePath, result) {
    copyVendorScriptsTo(path.dirname(relativePath));
    return result.replace('@@FILENAME_NO_EXT', relativePath.replace(/\.\w+$/, ''));
  }

  var htmlTree = new Funnel(modulesTree, {include: ['*/src/**/*.html'], destDir: '/'});
  htmlTree = replace(htmlTree, {
    files: ['examples*/**'],
    patterns: [{match: /\$SCRIPTS\$/, replacement: htmlReplace('SCRIPTS')}],
    replaceWithPath: writeScriptsForPath
  });
  htmlTree = replace(htmlTree, {
    files: ['benchmarks/**'],
    patterns: [{match: /\$SCRIPTS\$/, replacement: htmlReplace('SCRIPTS_benchmarks')}],
    replaceWithPath: writeScriptsForPath
  });
  htmlTree = replace(htmlTree, {
    files: ['benchmarks_external/**'],
    patterns: [{match: /\$SCRIPTS\$/, replacement: htmlReplace('SCRIPTS_benchmarks_external')}],
    replaceWithPath: writeScriptsForPath
  });

  // Copy all vendor scripts into all examples and benchmarks
  ['benchmarks/src', 'benchmarks_external/src', 'examples/src/benchpress'].forEach(
      copyVendorScriptsTo);

  var scripts = mergeTrees(servingTrees, {overwrite: true});
  var css = new Funnel(modulesTree, {include: ["**/*.css"]});
  var polymerFiles = new Funnel('.', {
    files: [
      'bower_components/polymer/lib/polymer.html',
      'tools/build/snippets/url_params_to_form.js'
    ]
  });
  var polymer = stew.mv(flatten(polymerFiles), 'benchmarks_external/src/tree/polymer');
  htmlTree = mergeTrees([htmlTree, scripts, polymer, css]);

  es5Tree = mergeTrees([es5Tree, htmlTree]);

  var mergedTree = mergeTrees([stew.mv(es6Tree, '/es6'), stew.mv(es5Tree, '/es5')]);

  // TODO(iminar): tree differ seems to have issues with trees created by mergeTrees, investigate!
  //   ENOENT error is thrown while doing fs.readdirSync on inputRoot
  //   in the meantime, we just do noop mv to create a new tree
  mergedTree = stew.mv(mergedTree, '');

  return destCopy(mergedTree, destinationPath);
};