import {ListWrapper} from 'angular2/src/facade/collection';

import {ProtoChangeDetector, ChangeDetector, ChangeDetectorDefinition} from './interfaces';
import {ChangeDetectorJITGenerator} from './change_detection_jit_generator';

import {coalesce} from './coalesce';
import {ProtoRecordBuilder} from './proto_change_detector';

export class JitProtoChangeDetector implements ProtoChangeDetector {
  _factory: Function;

  constructor(private definition: ChangeDetectorDefinition) {
    this._factory = this._createFactory(definition);
  }

  static isSupported(): boolean { return true; }

  instantiate(dispatcher: any): ChangeDetector { return this._factory(dispatcher); }

  _createFactory(definition: ChangeDetectorDefinition) {
    var recordBuilder = new ProtoRecordBuilder();
    ListWrapper.forEach(definition.bindingRecords,
                        (b) => { recordBuilder.add(b, definition.variableNames); });
    var records = coalesce(recordBuilder.records);
    return new ChangeDetectorJITGenerator(definition.id, definition.strategy, records,
                                          this.definition.directiveRecords)
        .generate();
  }
}