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/*
 * #%L
 * anwiba commons advanced
 * %%
 * Copyright (C) 2007 - 2016 Andreas Bartels
 * %%
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as
 * published by the Free Software Foundation, either version 2.1 of the
 * License, or (at your option) any later version.
 * 
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Lesser Public License for more details.
 * 
 * You should have received a copy of the GNU General Lesser Public
 * License along with this program.  If not, see
 * .
 * #L%
 */
package net.anwiba.commons.workflow;

import java.util.ArrayList;
import java.util.List;

import net.anwiba.commons.lang.functional.IApplicable;
import net.anwiba.commons.lang.functional.IFunction;
import net.anwiba.commons.workflow.state.IState;
import net.anwiba.commons.workflow.transition.ITransition;
import net.anwiba.commons.workflow.transition.Transition;

public class WorkflowBuilder implements IWorkflowBuilder {

  private final IExecuterFactory closureDelegatorFactory = new DefaultDelegatingExecuterFactory<>();
  private final List> transitions = new ArrayList<>();
  private IWorkflowController workflowController = null;

  @Override
  public void add(final IApplicable> applicable, final IExecutable executable) {
    add(new Transition<>(applicable, s -> executable));
  }

  @Override
  public void add(final ITransition transition) {
    if (this.workflowController != null) {
      throw new IllegalArgumentException();
    }
    this.transitions.add(transition);
  }

  @Override
  public void add(
      final IApplicable> applicable,
      final IFunction, IExecutable, RuntimeException> factory) {
    add(new Transition<>(applicable, factory));
  }

  public void setWorkflowController(final IWorkflowController workflowController) {
    if (!this.transitions.isEmpty()) {
      throw new IllegalArgumentException();
    }
    this.workflowController = workflowController;
  }

  @Override
  public IWorkflow build() {
    this.workflowController = new WorkflowController<>(this.transitions);
    return new Workflow<>(this.closureDelegatorFactory, this.workflowController);
  }

}