/*   Copyright 2004 The Apache Software Foundation
 *
 *   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 org.apache.xmlbeans.impl.schema;

import org.apache.xmlbeans.*;

import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import java.util.stream.Collectors;

/*package*/ class SchemaContainer {
    // The namespace that this is the container for
    // TODO(radup) In the future, I think the right approach is one container
    // per file instead of per namespace, but per namespace is easier for now
    private final String _namespace;

    SchemaContainer(String namespace) {
        _namespace = namespace;
    }

    String getNamespace() {
        return _namespace;
    }

    // The SchemaTypeSystem on behalf of which this acts
    private SchemaTypeSystem _typeSystem;

    // This is the whole idea of the containers
    // By synchronizing getter/setters on this field, we allow
    // both SchemaTypeSystems and SchemaTypes to be immutable
    // at the same time providing the mechanism through which
    // we can "move" SchemaTypes from one SchemaTypeSystem to another
    // via incremental compilation
    synchronized SchemaTypeSystem getTypeSystem() {
        return _typeSystem;
    }

    synchronized void setTypeSystem(SchemaTypeSystem typeSystem) {
        _typeSystem = typeSystem;
    }

    // Immutability refers to the content of the container
    // Once the container has been initialized, one cannot add/remove
    // SchemaComponents from it. Instead, one has to blow it away
    // and build a new one.
    // Immutability does not mean that one cannot move this container
    // between typesystems.
    boolean _immutable;

    synchronized void setImmutable() {
        _immutable = true;
    }

    synchronized void unsetImmutable() {
        _immutable = false;
    }

    private void check_immutable() {
        if (_immutable) {
            throw new IllegalStateException("Cannot add components to immutable SchemaContainer");
        }
    }

    // Data
    // TODO(radup) unmodifiableList() is not really necessary, since this
    // is package-level access and code in this package should do the "right thing"
    // Global Elements
    private final List<SchemaGlobalElement.Ref> _globalElements = new ArrayList<>();

    void addGlobalElement(SchemaGlobalElement.Ref e) {
        check_immutable();
        _globalElements.add(e);
    }

    List<SchemaGlobalElement> globalElements() {
        return _globalElements.stream().map(SchemaGlobalElement.Ref::get).collect(Collectors.toList());
    }

    // Global Attributes
    private final List<SchemaGlobalAttribute.Ref> _globalAttributes = new ArrayList<>();

    void addGlobalAttribute(SchemaGlobalAttribute.Ref a) {
        check_immutable();
        _globalAttributes.add(a);
    }

    List<SchemaGlobalAttribute> globalAttributes() {
        return _globalAttributes.stream().map(SchemaGlobalAttribute.Ref::get).collect(Collectors.toList());
    }

    // Model Groups
    private final List<SchemaModelGroup.Ref> _modelGroups = new ArrayList<>();

    void addModelGroup(SchemaModelGroup.Ref g) {
        check_immutable();
        _modelGroups.add(g);
    }

    List<SchemaModelGroup> modelGroups() {
        return _modelGroups.stream().map(SchemaModelGroup.Ref::get).collect(Collectors.toList());
    }

    // Redefined Model Groups
    private final List<SchemaModelGroup.Ref> _redefinedModelGroups = new ArrayList<>();

    void addRedefinedModelGroup(SchemaModelGroup.Ref g) {
        check_immutable();
        _redefinedModelGroups.add(g);
    }

    List<SchemaModelGroup> redefinedModelGroups() {
        return _redefinedModelGroups.stream().map(SchemaModelGroup.Ref::get).collect(Collectors.toList());
    }

    // Attribute Groups
    private final List<SchemaAttributeGroup.Ref> _attributeGroups = new ArrayList<>();

    void addAttributeGroup(SchemaAttributeGroup.Ref g) {
        check_immutable();
        _attributeGroups.add(g);
    }

    List<SchemaAttributeGroup> attributeGroups() {
        return _attributeGroups.stream().map(SchemaAttributeGroup.Ref::get).collect(Collectors.toList());
    }

    // Redefined Attribute Groups
    private final List<SchemaAttributeGroup.Ref> _redefinedAttributeGroups = new ArrayList<>();

    void addRedefinedAttributeGroup(SchemaAttributeGroup.Ref g) {
        check_immutable();
        _redefinedAttributeGroups.add(g);
    }

    List<SchemaAttributeGroup> redefinedAttributeGroups() {
        return _redefinedAttributeGroups.stream().map(SchemaAttributeGroup.Ref::get).collect(Collectors.toList());
    }

    // Global Types
    private final List<SchemaType.Ref> _globalTypes = new ArrayList<>();

    void addGlobalType(SchemaType.Ref t) {
        check_immutable();
        _globalTypes.add(t);
    }

    List<SchemaType> globalTypes() {
        return _globalTypes.stream().map(SchemaType.Ref::get).collect(Collectors.toList());
    }

    // Redefined Global Types
    private final List<SchemaType.Ref> _redefinedGlobalTypes = new ArrayList<>();

    void addRedefinedType(SchemaType.Ref t) {
        check_immutable();
        _redefinedGlobalTypes.add(t);
    }

    List<SchemaType> redefinedGlobalTypes() {
        return _redefinedGlobalTypes.stream().map(SchemaType.Ref::get).collect(Collectors.toList());
    }

    // Document Types
    private final List<SchemaType.Ref> _documentTypes = new ArrayList<>();

    void addDocumentType(SchemaType.Ref t) {
        check_immutable();
        _documentTypes.add(t);
    }

    List<SchemaType> documentTypes() {
        return _documentTypes.stream().map(SchemaType.Ref::get).collect(Collectors.toList());
    }

    // Attribute Types
    private final List<SchemaType.Ref> _attributeTypes = new ArrayList<>();

    void addAttributeType(SchemaType.Ref t) {
        check_immutable();
        _attributeTypes.add(t);
    }

    List<SchemaType> attributeTypes() {
        return _attributeTypes.stream().map(SchemaType.Ref::get).collect(Collectors.toList());
    }

    // Identity Constraints
    private final List<SchemaIdentityConstraint.Ref> _identityConstraints = new ArrayList<>();

    void addIdentityConstraint(SchemaIdentityConstraint.Ref c) {
        check_immutable();
        _identityConstraints.add(c);
    }

    List<SchemaIdentityConstraint> identityConstraints() {
        return _identityConstraints.stream().map(SchemaIdentityConstraint.Ref::get).collect(Collectors.toList());
    }

    // Annotations
    private final List<SchemaAnnotation> _annotations = new ArrayList<>();

    void addAnnotation(SchemaAnnotation a) {
        check_immutable();
        _annotations.add(a);
    }

    List<SchemaAnnotation> annotations() {
        return Collections.unmodifiableList(_annotations);
    }
}