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/*
 * Copyright 2011 Google Inc.
 * 
 * Licensed under the Apache License, Version 2.0 (the "License"); you may not
 * use this file except in compliance with the License. You may obtain a copy of
 * the License at
 * 
 * http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
 * License for the specific language governing permissions and limitations under
 * the License.
 */
package com.google.gwt.editor.client.impl;

import com.google.gwt.editor.client.Editor;
import com.google.gwt.editor.client.EditorDriver;
import com.google.gwt.editor.client.impl.DelegateMap.KeyMethod;

import java.util.Iterator;
import java.util.List;

import javax.validation.ConstraintViolation;

/**
 * Abstraction of a ConstraintViolation or a RequestFactory Violation object.
 * Also contains a factory method to create SimpleViolation instances from
 * {@link ConstraintViolation} objects.
 */
public abstract class SimpleViolation {
  /**
   * Provides a source of SimpleViolation objects based on ConstraintViolations.
   * This is re-used by the RequestFactoryEditorDriver implementation, which
   * does not share a type hierarchy with the SimpleBeanEditorDriver.
   */
  static class ConstraintViolationIterable implements Iterable {

    private final Iterable> violations;

    public ConstraintViolationIterable(
        Iterable> violations) {
      this.violations = violations;
    }

    public Iterator iterator() {
      // Use a fresh source iterator each time
      final Iterator> source = violations.iterator();
      return new Iterator() {
        public boolean hasNext() {
          return source.hasNext();
        }

        public SimpleViolation next() {
          return new SimpleViolationAdapter(source.next());
        }

        public void remove() {
          source.remove();
        }
      };
    }
  }

  /**
   * Adapts the ConstraintViolation interface to the SimpleViolation interface.
   */
  static class SimpleViolationAdapter extends SimpleViolation {
    private final ConstraintViolation v;

    public SimpleViolationAdapter(ConstraintViolation v) {
      this.v = v;
    }

    @Override
    public Object getKey() {
      return v.getLeafBean();
    }

    @Override
    public String getMessage() {
      return v.getMessage();
    }

    @Override
    public String getPath() {
      /*
       * TODO(bobv,nchalko): Determine the correct way to extract this
       * information from the ConstraintViolation.
       */
      return v.getPropertyPath().toString();
    }

    @Override
    public Object getUserDataObject() {
      return v;
    }
  }

  public static Iterable iterableFromConstrantViolations(
      Iterable> violations) {
    return new ConstraintViolationIterable(violations);
  }

  /**
   * Maps an abstract representation of a violation into the appropriate
   * EditorDelegate.
   */
  public static void pushViolations(Iterable violations,
      EditorDriver driver, KeyMethod keyMethod) {
    DelegateMap delegateMap = DelegateMap.of(driver, keyMethod);

    // For each violation
    for (SimpleViolation error : violations) {
      Object key = error.getKey();
      List> delegateList = delegateMap.get(key);
      if (delegateList != null) {

        // For each delegate editing some record...
        for (AbstractEditorDelegate baseDelegate : delegateList) {

          // compute its base path in the hierarchy...
          String basePath = baseDelegate.getPath();

          // and the absolute path of the leaf editor receiving the error.
          String absolutePath = (basePath.length() > 0 ? basePath + "." : "")
              + error.getPath();

          // Find the leaf editor's delegate.
          List> leafDelegates = delegateMap.getDelegatesByPath(absolutePath);
          List> editors = delegateMap.getEditorByPath(absolutePath);
          if (leafDelegates != null) {
            for (AbstractEditorDelegate delegate : leafDelegates) {
              delegate.recordError(error.getMessage(), null,
                  error.getUserDataObject());
            }
          } else if (editors != null) {
            // No EditorDelegate to attach it to, so fake the source
            for (Editor editor : editors) {
              baseDelegate.recordError(error.getMessage(), null,
                  error.getUserDataObject(), error.getPath(), editor);
            }
          }
        }
      }
    }
  }

  /**
   * Typically constructed via factory methods.
   */
  protected SimpleViolation() {
  }

  /**
   * Return the object that the violation is about.
   */
  public abstract Object getKey();

  /**
   * Return a user-facing message describing the violation.
   */
  public abstract String getMessage();

  /**
   * Return a dotted path describing the property.
   */
  public abstract String getPath();

  /**
   * An object that should be available from
   * {@link com.google.gwt.editor.client.EditorError#getUserData()}.
   */
  public abstract Object getUserDataObject();
}