/*
 *  Licensed to the Apache Software Foundation (ASF) under one
 *  or more contributor license agreements.  See the NOTICE file
 *  distributed with this work for additional information
 *  regarding copyright ownership.  The ASF licenses this file
 *  to you 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
 *
 *    https://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.grails.datastore.gorm.services.implementers

import java.lang.reflect.Modifier

import groovy.transform.CompileStatic
import org.codehaus.groovy.ast.ASTNode
import org.codehaus.groovy.ast.AnnotationNode
import org.codehaus.groovy.ast.ClassHelper
import org.codehaus.groovy.ast.ClassNode
import org.codehaus.groovy.ast.FieldNode
import org.codehaus.groovy.ast.InnerClassNode
import org.codehaus.groovy.ast.MethodNode
import org.codehaus.groovy.ast.ModuleNode
import org.codehaus.groovy.ast.Parameter
import org.codehaus.groovy.ast.expr.ConstantExpression
import org.codehaus.groovy.ast.expr.Expression
import org.codehaus.groovy.ast.expr.ListExpression
import org.codehaus.groovy.transform.DelegateASTTransformation

import org.grails.datastore.gorm.transform.AstPropertyResolveUtils
import org.grails.datastore.mapping.reflect.AstUtils
import org.grails.datastore.mapping.reflect.NameUtils

import static org.codehaus.groovy.ast.tools.GeneralUtils.assignS
import static org.codehaus.groovy.ast.tools.GeneralUtils.block
import static org.codehaus.groovy.ast.tools.GeneralUtils.param
import static org.codehaus.groovy.ast.tools.GeneralUtils.params
import static org.codehaus.groovy.ast.tools.GeneralUtils.varX

/**
 * Base trait for building interface projections
 *
 * @author Graeme Rocher
 * @since 6.1.1
 */
@CompileStatic
trait InterfaceProjectionBuilder {

    boolean isInterfaceProjection(ClassNode domainClass, MethodNode methodNode, ClassNode returnType) {
        if (returnType.isInterface() && !returnType.packageName?.startsWith('java.')) {
            List<String> interfacePropertyNames = AstPropertyResolveUtils.getPropertyNames(returnType)

            for (prop in interfacePropertyNames) {
                ClassNode existingType = AstPropertyResolveUtils.getPropertyType(domainClass, prop)
                ClassNode propertyType = AstPropertyResolveUtils.getPropertyType(returnType, prop)
                if (existingType == null) {
                    return false
                }
                else if (!AstUtils.isSubclassOfOrImplementsInterface(existingType, propertyType)) {
                    return false
                }
            }
            return true
        }
        return false
    }

    MethodNode buildInterfaceImpl(ClassNode interfaceNode, ClassNode declaringClass, ClassNode targetDomainClass, MethodNode abstractMethodNode) {
        List<Expression> getterNames = (List<Expression>) AstPropertyResolveUtils.getPropertyNames(interfaceNode)
                .collect() {
                    new ConstantExpression(NameUtils.getGetterName(it))
                }
        String innerClassName = "${declaringClass.name}\$${interfaceNode.nameWithoutPackage}"
        InnerClassNode innerClassNode = (InnerClassNode) declaringClass.innerClasses.find { InnerClassNode inner -> inner.name == innerClassName }

        MethodNode methodTarget
        Parameter domainClassParam = param(targetDomainClass.plainNodeReference, 'target')
        Parameter[] params = params(domainClassParam)
        if (innerClassNode == null) {
            innerClassNode = new InnerClassNode(declaringClass, innerClassName, Modifier.STATIC | Modifier.PRIVATE, ClassHelper.OBJECT_TYPE, [interfaceNode.plainNodeReference] as ClassNode[], null)
            FieldNode field = innerClassNode.addField(
                    '$target', Modifier.PUBLIC, targetDomainClass.plainNodeReference, null
            )
            methodTarget = innerClassNode.addMethod('$setTarget', Modifier.PUBLIC, ClassHelper.VOID_TYPE, params, null, block(
                    assignS(varX(field), varX(domainClassParam))
            ))
            AnnotationNode delegateAnn = new AnnotationNode(new ClassNode(Delegate))
            delegateAnn.setMember('includes', new ListExpression(getterNames))
            delegateAnn.setMember('interfaces', new ConstantExpression(false))
            ModuleNode module = abstractMethodNode.declaringClass.module
            new DelegateASTTransformation().visit(
                    [delegateAnn, field] as ASTNode[],
                    module.context
            )
            module.addClass(innerClassNode)
        } else {
            methodTarget = innerClassNode.getMethod('$setTarget', params)
        }
        return methodTarget
    }
}
