package brn.gui.fwdgraph.diagram.providers;

import java.text.MessageFormat;
import java.text.ParsePosition;

import org.eclipse.core.runtime.IAdaptable;
import org.eclipse.emf.ecore.EClassifier;
import org.eclipse.emf.ecore.EDataType;
import org.eclipse.emf.ecore.EEnum;
import org.eclipse.emf.ecore.EEnumLiteral;
import org.eclipse.emf.ecore.EObject;
import org.eclipse.emf.ecore.EStructuralFeature;
import org.eclipse.gmf.runtime.common.core.command.ICommand;
import org.eclipse.gmf.runtime.common.core.command.UnexecutableCommand;
import org.eclipse.gmf.runtime.common.ui.services.parser.IParser;
import org.eclipse.gmf.runtime.common.ui.services.parser.IParserEditStatus;
import org.eclipse.gmf.runtime.common.ui.services.parser.ParserEditStatus;
import org.eclipse.gmf.runtime.emf.type.core.commands.SetValueCommand;
import org.eclipse.gmf.runtime.emf.type.core.requests.SetRequest;
import org.eclipse.jface.text.contentassist.IContentAssistProcessor;
import brn.gui.fwdgraph.diagram.part.FwdGraphDiagramEditorPlugin;

import brn.gui.fwdgraph.diagram.part.ModelDiagramEditorPlugin;

/**
 * @generated
 */
public abstract class ModelAbstractParser implements IParser {

  /**
   * @generated
   */
  private String viewPattern;

  /**
   * @generated
   */
  private MessageFormat viewProcessor;

  /**
   * @generated
   */
  private String editPattern;

  /**
   * @generated
   */
  private MessageFormat editProcessor;

  /**
   * @generated
   */
  public String getViewPattern() {
    return viewPattern;
  }

  /**
   * @generated
   */
  protected MessageFormat getViewProcessor() {
    return viewProcessor;
  }

  /**
   * @generated
   */
  public void setViewPattern(String viewPattern) {
    this.viewPattern = viewPattern;
    viewProcessor = createViewProcessor(viewPattern);
  }

  /**
   * @generated
   */
  protected MessageFormat createViewProcessor(String viewPattern) {
    return new MessageFormat(viewPattern);
  }

  /**
   * @generated
   */
  public String getEditPattern() {
    return editPattern;
  }

  /**
   * @generated
   */
  protected MessageFormat getEditProcessor() {
    return editProcessor;
  }

  /**
   * @generated
   */
  public void setEditPattern(String editPattern) {
    this.editPattern = editPattern;
    editProcessor = createEditProcessor(editPattern);
  }

  /**
   * @generated
   */
  protected MessageFormat createEditProcessor(String editPattern) {
    return new MessageFormat(editPattern);
  }

  /**
   * @generated
   */
  public String getPrintString(IAdaptable adapter, int flags) {
    return getStringByPattern(adapter, flags, getViewPattern(),
        getViewProcessor());
  }

  /**
   * @generated
   */
  public String getEditString(IAdaptable adapter, int flags) {
    return getStringByPattern(adapter, flags, getEditPattern(),
        getEditProcessor());
  }

  /**
   * @generated
   */
  protected abstract String getStringByPattern(IAdaptable adapter, int flags,
      String pattern, MessageFormat processor);

  /**
   * @generated
   */
  public IParserEditStatus isValidEditString(IAdaptable element,
      String editString) {
    ParsePosition pos = new ParsePosition(0);
    Object[] values = getEditProcessor().parse(editString, pos);
    if (values == null) {
      return new ParserEditStatus(FwdGraphDiagramEditorPlugin.ID,
          IParserEditStatus.UNEDITABLE, "Invalid input at "
              + pos.getErrorIndex());
    }
    return validateNewValues(values);
  }

  /**
   * @generated
   */
  protected IParserEditStatus validateNewValues(Object[] values) {
    return ParserEditStatus.EDITABLE_STATUS;
  }

  /**
   * @generated
   */
  public ICommand getParseCommand(IAdaptable adapter, String newString,
      int flags) {
    Object[] values = getEditProcessor().parse(newString, new ParsePosition(0));
    if (values == null
        || validateNewValues(values).getCode() != IParserEditStatus.EDITABLE) {
      return UnexecutableCommand.INSTANCE;
    }
    return getParseCommand(adapter, values);
  }

  /**
   * @generated
   */
  protected abstract ICommand getParseCommand(IAdaptable adapter,
      Object[] values);

  /**
   * @generated
   */
  public IContentAssistProcessor getCompletionProcessor(IAdaptable element) {
    return null;
  }

  /**
   * @generated
   */
  protected ICommand getModificationCommand(EObject element,
      EStructuralFeature feature, Object value) {
    value = getValidNewValue(feature, value);
    if (value instanceof InvalidValue) {
      return UnexecutableCommand.INSTANCE;
    }
    SetRequest request = new SetRequest(element, feature, value);
    return new SetValueCommand(request);
  }

  /**
   * @generated
   */
  protected Object getValidValue(EStructuralFeature feature, Object value) {
    EClassifier type = feature.getEType();
    if (type instanceof EDataType) {
      Class iClass = type.getInstanceClass();
      if (String.class.equals(iClass)) {
        if (value == null) {
          value = ""; //$NON-NLS-1$
        }
      }
    }
    return value;
  }

  /**
   * @generated
   */
  protected Object getValidNewValue(EStructuralFeature feature, Object value) {
    EClassifier type = feature.getEType();
    if (type instanceof EDataType) {
      Class iClass = type.getInstanceClass();
      if (Boolean.TYPE.equals(iClass)) {
        if (value instanceof Boolean) {
          // ok
        } else if (value instanceof String) {
          value = Boolean.valueOf((String) value);
        } else {
          value = new InvalidValue("Value of type Boolean is expected");
        }
      } else if (Character.TYPE.equals(iClass)) {
        if (value instanceof Character) {
          // ok
        } else if (value instanceof String) {
          String s = (String) value;
          if (s.length() == 0) {
            value = null;
          } else {
            value = new Character(s.charAt(0));
          }
        } else {
          value = new InvalidValue("Value of type Character is expected");
        }
      } else if (Byte.TYPE.equals(iClass)) {
        if (value instanceof Byte) {
          // ok
        } else if (value instanceof Number) {
          value = new Byte(((Number) value).byteValue());
        } else if (value instanceof String) {
          String s = (String) value;
          if (s.length() == 0) {
            value = null;
          } else {
            try {
              value = Byte.valueOf(s);
            } catch (NumberFormatException nfe) {
              value = new InvalidValue(
                  "String value does not convert to Byte value");
            }
          }
        } else {
          value = new InvalidValue("Value of type Byte is expected");
        }
      } else if (Short.TYPE.equals(iClass)) {
        if (value instanceof Short) {
          // ok
        } else if (value instanceof Number) {
          value = new Short(((Number) value).shortValue());
        } else if (value instanceof String) {
          String s = (String) value;
          if (s.length() == 0) {
            value = null;
          } else {
            try {
              value = Short.valueOf(s);
            } catch (NumberFormatException nfe) {
              value = new InvalidValue(
                  "String value does not convert to Short value");
            }
          }
        } else {
          value = new InvalidValue("Value of type Short is expected");
        }
      } else if (Integer.TYPE.equals(iClass)) {
        if (value instanceof Integer) {
          // ok
        } else if (value instanceof Number) {
          value = new Integer(((Number) value).intValue());
        } else if (value instanceof String) {
          String s = (String) value;
          if (s.length() == 0) {
            value = null;
          } else {
            try {
              value = Integer.valueOf(s);
            } catch (NumberFormatException nfe) {
              value = new InvalidValue(
                  "String value does not convert to Integer value");
            }
          }
        } else {
          value = new InvalidValue("Value of type Integer is expected");
        }
      } else if (Long.TYPE.equals(iClass)) {
        if (value instanceof Long) {
          // ok
        } else if (value instanceof Number) {
          value = new Long(((Number) value).longValue());
        } else if (value instanceof String) {
          String s = (String) value;
          if (s.length() == 0) {
            value = null;
          } else {
            try {
              value = Long.valueOf(s);
            } catch (NumberFormatException nfe) {
              value = new InvalidValue(
                  "String value does not convert to Long value");
            }
          }
        } else {
          value = new InvalidValue("Value of type Long is expected");
        }
      } else if (Float.TYPE.equals(iClass)) {
        if (value instanceof Float) {
          // ok
        } else if (value instanceof Number) {
          value = new Float(((Number) value).floatValue());
        } else if (value instanceof String) {
          String s = (String) value;
          if (s.length() == 0) {
            value = null;
          } else {
            try {
              value = Float.valueOf(s);
            } catch (NumberFormatException nfe) {
              value = new InvalidValue(
                  "String value does not convert to Float value");
            }
          }
        } else {
          value = new InvalidValue("Value of type Float is expected");
        }
      } else if (Double.TYPE.equals(iClass)) {
        if (value instanceof Double) {
          // ok
        } else if (value instanceof Number) {
          value = new Double(((Number) value).doubleValue());
        } else if (value instanceof String) {
          String s = (String) value;
          if (s.length() == 0) {
            value = null;
          } else {
            try {
              value = Double.valueOf(s);
            } catch (NumberFormatException nfe) {
              value = new InvalidValue(
                  "String value does not convert to Double value");
            }
          }
        } else {
          value = new InvalidValue("Value of type Double is expected");
        }
      } else if (type instanceof EEnum) {
        if (value instanceof String) {
          EEnumLiteral literal = ((EEnum) type)
              .getEEnumLiteralByLiteral((String) value);
          if (literal == null) {
            value = new InvalidValue("Unknown literal: " + value);
          } else {
            value = literal.getInstance();
          }
        } else {
          value = new InvalidValue("Value of type String is expected");
        }
      }
    }
    return value;
  }

  /**
   * @generated
   */
  protected class InvalidValue {

    private String description;

    public InvalidValue(String description) {
      this.description = description;
    }

    public String toString() {
      return description;
    }
  }
}
