/**
 * Copyright 2005-2014 The Kuali Foundation
 *
 * Licensed under the Educational Community 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.opensource.org/licenses/ecl2.php
 *
 * 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 org.kuali.rice.krad.service;

import java.beans.PropertyDescriptor;

import org.kuali.rice.krad.datadictionary.DataDictionaryEntry;
import org.kuali.rice.krad.datadictionary.ReferenceDefinition;
import org.kuali.rice.krad.datadictionary.state.StateMapping;
import org.kuali.rice.krad.datadictionary.validation.AttributeValueReader;
import org.kuali.rice.krad.datadictionary.validation.result.DictionaryValidationResult;
import org.kuali.rice.krad.document.Document;
import org.kuali.rice.krad.document.TransactionalDocument;

/**
 * Defines the API for the validating against the data dictionary.
 *
 * @author Kuali Rice Team (rice.collab@kuali.org)
 */
public interface DictionaryValidationService {

    /**
     * Validates the contents of a document (i.e. attributes within a document) against the data dictionary.
     *
     * @param document - document to validate
     */
    public void validateDocument(Document document);

    /**
     * Validates the contents of a document and recursively validates any of its updatable references
     *
     * @param document the document
     * @param maxDepth the maximum numbers of levels to recurse
     * @param validateRequired whether to validate whether a field is required and is currently blank
     */
    public void validateDocumentAndUpdatableReferencesRecursively(Document document, int maxDepth,
            boolean validateRequired);

    /**
     * Validates the contents of a document and recursively validates any of its updatable references
     *
     * @param document the document
     * @param maxDepth the maximum numbers of levels to recurse
     * @param validateRequired whether to validate whether a field is required and is currently blank
     * @param chompLastLetterSFromCollectionName if true, the error path for any collections encountered will have the
     * last "s" removed from the collection name if it ends
     * with the letter "s".  If false, this method acts like {@link #validateDocumentAndUpdatableReferencesRecursively(Document,
     * int, boolean)}
     */
    public void validateDocumentAndUpdatableReferencesRecursively(Document document, int maxDepth,
            boolean validateRequired, boolean chompLastLetterSFromCollectionName);

    /**
     * Validates the specified attribute of the given document against the data dictionary.
     *
     * @param document
     * @param attributeName
     * @param errorPrefix
     */
    public void validateDocumentAttribute(Document document, String attributeName, String errorPrefix);

    /**
     * Validates an object using its class name as the entry name to look up its metadata in the dictionary.
     *
     * @param object - an object to validate
     * @return the dictionary validation result object associated with this validation
     */
    public DictionaryValidationResult validate(Object object);

    /**
     * Validate an object with the passed in dictionary entryName and the specific attribute to be evaluated
     *
     * @param object - an object to validate
     * @param entryName - the dictionary entry name to look up the metadata associated with this object
     * @param attributeName - the name of the attribute (field) on the object that should be validated
     * @param doOptionalProcessing true if the validation should do optional validation (e.g. to check if empty values
     * are required or not), false otherwise
     * @return the dictionary validation result object associated with this validation
     * @since 1.1
     */
    public DictionaryValidationResult validate(Object object, String entryName, String attributeName,
            boolean doOptionalProcessing);

    /**
     * Same as {@link DictionaryValidationService#validate(Object, String, String, boolean)} except
     * that it provides an explicit data dictionary entry to use for the purpose of validation.
     * 
     * @param object - an object to validate
     * @param entryName - the dictionary entry name to use in association with error look ups
     * @param entry - the dictionary entry to use for validation
     * @param doOptionalProcessing true if the validation should do optional validation (e.g. to
     *        check if empty values are required or not), false otherwise
     * @return the dictionary validation result object associated with this validation
     * @since 1.1
     */
    public DictionaryValidationResult validate(Object object, String entryName, DataDictionaryEntry entry,
            boolean doOptionalProcessing);

    /**
     * Validates the object agains the next state (or current state if there is no next state).
     *
     * <p>When no stateMapping exists on the DataDictionaryEntry that applies for this object, validation is considered
     * stateless and all constraints are processed regardless of their states attribute.</p>
     *
     * @param object
     * @return the dictionary validation result object associated with this validation
     * @since 2.2
     */
    public DictionaryValidationResult validateAgainstNextState(Object object);

    /**
     * Validates the object against the state specified.
     *
     * <p>Important note: Alternatively the state can be changed on the
     * object itself and another validation method can be used instead of this one (in practice, you'd revert the
     * state on the object if validation returns errors).</p>
     *
     * @param object
     * @param validationState
     * @return the dictionary validation result object associated with this validation
     * @since 2.2
     */
    public DictionaryValidationResult validateAgainstState(Object object, String validationState);

    /**
     * Same as other validate methods, except allows you to provide the attributeValueReader directly for evaluation
     *
     * @param valueReader - an object to validate
     * @param doOptionalProcessing true if the validation should do optional validation (e.g. to check if empty values
     * are required or not), false otherwise
     * @return the dictionary validation result object associated with this validation
     * @since 1.1
     */
    public DictionaryValidationResult validate(AttributeValueReader valueReader, boolean doOptionalProcessing,
            String validationState, StateMapping stateMapping);

    /**
     * Encapsulates {@link #validateBusinessObject(BusinessObject)} and returns boolean so one
     * doesn't need to check the ErrorMap.Validates the business object primitive attributes against
     * the data dictionary. Adds errors to the map as they are encountered.<br/>
     * <br/>
     * Makes no error path adjustments
     * 
     * @param businessObject - business object to validate
     * @return boolean validOrNot
     */
    public boolean isBusinessObjectValid(Object businessObject);

    /**
     * Encapsulates {@link #validateBusinessObject(BusinessObject)} and returns boolean so one
     * doesn't need to check the ErrorMap.Validates the business object primitive attributes against
     * the data dictionary. Adds errors to the map as they are encountered.<br/>
     * <br/>
     * Makes no error path adjustments
     * 
     * @param businessObject - business object to validate
     * @param prefix - error prefix
     * @return boolean valid or not
     */
    public boolean isBusinessObjectValid(Object businessObject, String prefix);

    /**
     * Validates the business object primitive attributes against the data dictionary. Adds errors to the map as they
     * are
     * encountered.
     *
     * @param businessObject - business object to validate
     * @deprecated since 1.1 - use validate(Object.class) instead
     */
    @Deprecated
    public void validateBusinessObject(Object businessObject);

    /**
     * Validates the business object primitive attributes against the data dictionary. Adds errors to the map as they
     * are
     * encountered.
     *
     * @param businessObject - business object to validate
     * @param validateRequired - whether to execute required field checks
     * @deprecated since 1.1 - use validate(Object.class) instead
     */
    @Deprecated
    public void validateBusinessObject(Object businessObject, boolean validateRequired);

    /**
     * This method examines the populated BusinessObject bo instance passed in for a member named by the referenceName.
     * If this
     * member exists, and if this member is a descendent of BusinessObject, then an existence check proceeds.
     *
     * First the foreign keys for this reference are gathered, and then examined to see if they have values. If they do
     * not have
     * values, the method ends with a true return value. If they all have values, then an object with those primary
     * keys
     * is retrieve
     * from the database. If one is retrieve, then the reference exists, and True is returned. Otherwise, false is
     * returned.
     *
     * This method assumes that you already have the errorPath set exactly as desired, and adds new errors to the
     * errorMap with no
     * prefix, other than what has already been pushed onto the errorMap.
     *
     * @param dataObject - the data object whose reference is being tested.
     * @param reference - The ReferenceDefinition to be existence tested.
     * @return True if no exceptions occur and the object exists in the db, false otherwise.
     */
    public boolean validateReferenceExists(Object dataObject, ReferenceDefinition reference);

    /**
     * This method examines the populated BusinessObject bo instance passed in for a member named by the referenceName.
     * If this
     * member exists, and if this member is a descendent of BusinessObject, then an existence check proceeds.
     *
     * First the foreign keys for this reference are gathered, and then examined to see if they have values. If they do
     * not have
     * values, the method ends with a true return value. If they all have values, then an object with those primary
     * keys
     * is retrieve
     * from the database. If one is retrieve, then the reference exists, and True is returned. Otherwise, false is
     * returned.
     *
     * This method assumes that you already have the errorPath set exactly as desired, and adds new errors to the
     * errorMap with no
     * prefix, other than what has already been pushed onto the errorMap.
     *
     * @param dataObject - the data object whose reference is being tested.
     * @param referenceName - The name of the member to be existence tested.
     * @return True if no exceptions occur and the object exists in the db, false otherwise.
     */
    public boolean validateReferenceExists(Object dataObject, String referenceName);

    /**
     * This method retrieves the reference from the DB, and then tests whether the object is active.
     *
     * It will return false if there is no activeIndicator field on this object, if the object doesnt exist in the DB,
     * if the field
     * doesnt exist or cannot be cast as a boolean, if the field value is null, or if the field value is false.
     *
     * It will only return true if the reference bo is present, the field is present, it is a boolean and non-null, and
     * the value is
     * true.
     *
     * This method assumes that you already have the errorPath set exactly as desired, and adds new errors to the
     * errorMap with no
     * prefix, other than what has already been pushed onto the errorMap.
     *
     * @param dataObject
     * @param reference
     * @return true if the reference is active
     */
    public boolean validateReferenceIsActive(Object dataObject, ReferenceDefinition reference);

    /**
     * This method retrieves the reference from the DB, and then tests whether the object is active.
     *
     * It will return false if there is no activeIndicator field on this object, if the object doesnt exist in the DB,
     * if the field
     * doesnt exist or cannot be cast as a boolean, if the field value is null, or if the field value is false.
     *
     * It will only return true if the reference bo is present, the field is present, it is a boolean and non-null, and
     * the value is
     * true.
     *
     * This method assumes that you already have the errorPath set exactly as desired, and adds new errors to the
     * errorMap with no
     * prefix, other than what has already been pushed onto the errorMap.
     *
     * @param dataObject
     * @param referenceName
     * @return true if the reference is active
     */
    public boolean validateReferenceIsActive(Object dataObject, String referenceName);

    /**
     * validateReferenceExistsAndIsActive intelligently tests the designated reference on the data object for both existence and
     * active status, where
     * appropriate
     *
     * <p>It will not test anything if the foreign-key fields for the given reference aren't filled out with values,
     * and
     * it
     * will not test active status if the reference doesn't exist.</p>
     *
     * <p>Further, it will only test active status where the correct flag is set.</p>
     *
     * <p>On failures of either sort, it will put the relevant errors into the GlobalVariables errorMap, and return a
     * false. If there
     * are no failures, or nothing can be tested because the foreign-key fields arent fully filled out, it will return
     * true and add
     * no errors.</p>
     *
     * <p>This method assumes that you already have the errorPath set exactly as desired, and adds new errors to the
     * errorMap with no
     * prefix, other than what has already been pushed onto the errorMap.</p>
     *
     * @param dataObject - the data object instance to be tested.
     * @param reference - the ReferenceDefinition to control the nature of the testing.
     * @return true or false as per the criteria above
     */
    public boolean validateReferenceExistsAndIsActive(Object dataObject, ReferenceDefinition reference);

    /**
     * This method intelligently tests the designated reference on the data object for both existence and active status, where
     * appropriate.
     *
     * It will not test anything if the foreign-key fields for the given reference arent filled out with values, and it
     * will not
     * test active status if the reference doesnt exist.
     *
     * Note that it will not fail or raise any error if all of the foreign-keys are filled with a value. If this needs
     * to be tested
     * (ie, the 'if any field is filled, then all must be filled' rule), you'll have to do that separately.
     *
     * Further, it will only test active status where the correct flag is set.
     *
     * On failures of either sort, it will put the relevant errors into the GlobalVariables errorMap, and return a
     * false. If there
     * are no failures, or nothing can be tested because the foreign-key fields arent fully filled out, it will return
     * true and add
     * no errors.
     *
     * This method assumes that you already have the errorPath set exactly as desired, and adds new errors to the
     * errorMap with no
     * prefix, other than what has already been pushed onto the errorMap.
     *
     * @param dataObject - the BusinessObject instance to be tested.
     * @param referenceName - the member name on the data object to be tested for existence and active-state
     * @param attributeToHighlightOnFail - the fieldName to highlight with the error message on a failure
     * @param displayFieldName - the human-readable display name of the failed field, to go in the error message
     * @return true or false as per the criteria above
     */
    public boolean validateReferenceExistsAndIsActive(Object dataObject, String referenceName,
            String attributeToHighlightOnFail, String displayFieldName);

    /**
     * This method does an existence check against all references of a BusinessObject as defined in the
     * MaintenanceDocument.xml file
     * for that business object.
     *
     * Appropriate errors will also be placed in the GlobalVariables.ErrorMap.
     *
     * This method assumes that you already have the errorPath set exactly as desired, and adds new errors to the
     * errorMap with no
     * prefix, other than what has already been pushed onto the errorMap.
     *
     * @param dataObject - BusinessObject instance that should be tested
     * @return true if all passed existence tests, false if any failed
     */
    public boolean validateDefaultExistenceChecks(Object dataObject);

    /**
     * Does an existence check against all references configured as a default existence check in the maintenance
     * document data dictionary file for the given business object
     *
     * Appropriate errors will also be placed in the GlobalVariables.ErrorMap.
     *
     * This method assumes that you already have the errorPath set exactly as desired, and adds new errors to the
     * errorMap
     * with no
     * prefix, other than what has already been pushed onto the errorMap.
     *
     * @param dataObject parent business object instance to retrieve default checks for
     * @param newCollectionItem new collection line to validate
     * @param collectionName name of the collection in the parent
     * @return true if all passed existence tests, false if any failed
     */
    public boolean validateDefaultExistenceChecksForNewCollectionItem(Object dataObject, Object newCollectionItem,
            String collectionName);

    /**
     * This method does an existence check against all references of a transactionalDocument
     *
     * Appropriate errors will also be placed in the GlobalVariables.ErrorMap.
     *
     * This method assumes that you already have the errorPath set exactly as desired, and adds new errors to the
     * errorMap
     * with no
     * prefix, other than what has already been pushed onto the errorMap.
     *
     * @param document document instance that should be tested
     * @return true if all passed existence tests, false if any failed
     */
    public boolean validateDefaultExistenceChecksForTransDoc(TransactionalDocument document);

    /**
     * This method does an existence check against all references of a transactionalDocument
     *
     * Appropriate errors will also be placed in the GlobalVariables.ErrorMap.
     *
     * This method assumes that you already have the errorPath set exactly as desired, and adds new errors to the
     * errorMap
     * with no
     * prefix, other than what has already been pushed onto the errorMap.
     *
     * @param document document instance that should be tested
     * @param accountingLine that should be tested
     * @param collectionName that should be tested
     * @return true if all passed existence tests, false if any failed
     */
    public boolean validateDefaultExistenceChecksForNewCollectionItem(TransactionalDocument document,
            Object newCollectionItem, String collectionName);

    /**
     * @deprecated since 1.1
     */
    @Deprecated
    public void validatePrimitiveFromDescriptor(String entryName, Object object, PropertyDescriptor propertyDescriptor,
            String errorPrefix, boolean validateRequired);
}