'use strict';

var Funnel = require('broccoli-funnel');
var path = require('path');
var replace = require('broccoli-replace');
var stew = require('broccoli-stew');
var ts2dart = require('../broccoli-ts2dart');

module.exports = function makeDartTree() {
  // Transpile everything in 'modules'...
  var modulesTree = new Funnel('modules', {
    include: ['**/*.js', '**/*.ts', '**/*.dart'],  // .dart file available means don't translate.
    exclude: ['rtts_assert/**/*'],  // ... except for the rtts_asserts (don't apply to Dart).
    destDir: '/'                    // Remove the 'modules' prefix.
  });

  // Transpile to dart.
  var dartTree = ts2dart.transpile(modulesTree);

  // Move around files to match Dart's layout expectations.
  dartTree = stew.rename(dartTree, function(relativePath) {
    // If a file matches the `pattern`, insert the given `insertion` as the second path part.
    var replacements = [
      {pattern: /^benchmarks\/test\//, insertion: ''},
      {pattern: /^benchmarks\//, insertion: 'web'},
      {pattern: /^benchmarks_external\/test\//, insertion: ''},
      {pattern: /^benchmarks_external\//, insertion: 'web'},
      {pattern: /^example.?\//, insertion: 'web/'},
      {pattern: /^example.?\/test\//, insertion: ''},
      {pattern: /^[^\/]*\/test\//, insertion: ''},
      {pattern: /^./, insertion: 'lib'},  // catch all.
    ];

    for (var i = 0; i < replacements.length; i++) {
      var repl = replacements[i];
      if (relativePath.match(repl.pattern)) {
        var parts = relativePath.split('/');
        parts.splice(1, 0, repl.insertion);
        return path.join.apply(path, parts);
      }
    }
    throw new Error('Failed to match any path: ' + relativePath);
  });

  // Move the tree under the 'dart' folder.
  return stew.mv(dartTree, 'dart');
};