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/**
 * Copyright (c) 2003-2017 The Apereo 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://opensource.org/licenses/ecl2
 *
 * 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.sakaiproject.tool.gradebook.facades;

import java.util.List;
import java.util.Map;

/**
 * Facade to external role and authorization service.
 */
public interface Authz {
	public boolean isUserAbleToGrade(String gradebookUid);
	public boolean isUserAbleToGrade(String gradebookUid, String userUid);
	public boolean isUserAbleToGradeAll(String gradebookUid);
	public boolean isUserAbleToGradeAll(String gradebookUid, String userUid);
	public boolean isUserAbleToEditAssessments(String gradebookUid);
	public boolean isUserAbleToViewOwnGrades(String gradebookUid);
	public boolean isUserAbleToViewStudentNumbers(String gradebookUid);
	public boolean isUserHasGraderPermissions(String gradebookUid);
	public boolean isUserHasGraderPermissions(Long gradebookId);
	public boolean isUserHasGraderPermissions(Long gradebookId, String userUid);
	public boolean isUserHasGraderPermissions(String gradebookUid, String userUid);

	/**
	 * 
	 * @param gradebookUid
	 * @param itemId
	 * @param studentUid
	 * @return is user authorized to grade this gradebook item for this student?
	 * 		first checks for special grader perms. if none, uses default perms
	 */
	public boolean isUserAbleToGradeItemForStudent(String gradebookUid, Long itemId, String studentUid)  throws IllegalArgumentException;
	
	/**
	 * 
	 * @param gradebookUid
	 * @param itemId
	 * @param studentUid
	 * @return is user authorized to view this gradebook item for this student?
	 * 		first checks for special grader perms. if none, uses default perms
	 */
	public boolean isUserAbleToViewItemForStudent(String gradebookUid, Long itemId, String studentUid)  throws IllegalArgumentException;
	
	/**
	 * @param gradebookUid
	 * @return all of the CourseSections for this site
	 */
	public List getAllSections(String gradebookUid);
	
	/**
	 * 
	 * @param gradebookUid
	 * @return all CourseSections that the current user may view or grade
	 */
	public List getViewableSections(String gradebookUid);
	
	/**
	 * @param gradebookUid
	 * @param userUid
	 * @param categoryId
	 * 			The category id that the desired item is associated with
	 * @param gbCategoryType
	 * 			The category type setting for this gradebook
	 * @param optionalSearchString
	 * 			a substring search for student name or display UID; the exact rules are
	 *  		up to the implementation - leave null to use all students
	 * @param optionalSectionUid
	 * 			null if the search should be made across all sections
	 * @return a map of EnrollmentRecords to grade/view permission that the given user is authorized to
	 * 			view or grade for the given gradebook item
	 */
	public Map findMatchingEnrollmentsForItemForUser(String userUid, String gradebookUid, Long categoryId, int gbCategoryType, String optionalSearchString, String optionalSectionUid);
	
	/**
     * 
     * @param gradebookUid
     * @param categoryId
     *          The category id that the desired item is associated with
     * @param gbCategoryType
     *          The category type setting for this gradebook
     * @param optionalSearchString
     *          a substring search for student name or display UID; the exact rules are
     *          up to the implementation - leave null to use all students
     * @param optionalSectionUid
     *          null if the search should be made across all sections
     * @return a map of EnrollmentRecords to grade/view permission that the current user is authorized to
     *          view or grade for the given gradebook item
     */
    public Map findMatchingEnrollmentsForItem(String gradebookUid, Long categoryId, int gbCategoryType, String optionalSearchString, String optionalSectionUid);
	
	/**
	 * 
	 * @param gradebookUid
	 * @param gbCategoryType
	 * 			The category type setting for this gradebook
	 * @param optionalSearchString
	 * @param optionalSectionUid
	 * @return Map of EnrollmentRecord --> function (grade/view) for all students that the current user has permission to
	 * 			view/grade every item in the gradebook. If he/she can grade everything, GRADE function is
	 * 			returned. Otherwise, function is VIEW. May only modify course grade if he/she can grade
	 * 			everything in the gradebook for that student. If he/she can grade only a subset of the items, the
	 * 			student is not returned.
	 */
	public Map findMatchingEnrollmentsForViewableCourseGrade(String gradebookUid, int gbCategoryType, String optionalSearchString, String optionalSectionUid);
	/**
	 * 
	 * @param gradebookUid
	 * @param allGbItems
	 * 			List of all Assignments associated with this gradebook
	 * @param optionalSearchString
	 * 			a substring search for student name or display UID; the exact rules are
	 *  		up to the implementation - leave null to use all students
	 * @param optionalSectionUid
	 * 			null if the search should be made across all sections
	 * @return a map of EnrollmentRecords to a map of item id and function (grade/view) that the user is
	 * 			authorized to view/grade
	 */
	public Map findMatchingEnrollmentsForViewableItems(String gradebookUid, List allGbItems, String optionalSearchString, String optionalSectionUid);
	
	/**
	 * 
	 * @param gradebookUid
	 * @param studentUid
	 * @return a list of all section memberships for the given studentUid
	 */
	public List findStudentSectionMemberships(String gradebookUid, String studentUid);
	
	/**
	 * 
	 * @param gradebookUid
	 * @param studentUid
	 * @return a list of the section membership names for the give studentUid
	 */
	public List getStudentSectionMembershipNames(String gradebookUid, String studentUid);
	
	/**
	 * Check to see if current user may grade or view the given student for the given item in the given gradebook.
	 * Returns string representation of function per GradebookService vars (view/grade) or null if no permission
	 * @param gradebookUid
	 * @param itemId
	 * @param studentUid
	 * @return GradebookService.gradePermission, GradebookService.viewPermission, or null if no permission
	 */
	public String getGradeViewFunctionForUserForStudentForItem(String gradebookUid, Long itemId, String studentUid);
}