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/*
 * Copyright 2020 the original author or authors.
 * 
 * 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
 * 

 * 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.openrewrite.java;

import org.openrewrite.Cursor;
import org.openrewrite.internal.ListUtils;
import org.openrewrite.internal.StringUtils;
import org.openrewrite.java.tree.J;
import org.openrewrite.java.tree.JavaType;
import org.openrewrite.java.tree.Statement;
import org.openrewrite.java.tree.TypeUtils;

import static java.util.Collections.emptyList;

public class GenerateGetterAndSetterVisitor
 extends JavaIsoVisitor {
    private final String fieldName;
    private final String capitalizedFieldName;
    private final JavaTemplate getter = JavaTemplate
            .builder("" + "public #{} #{}() {return #{any()};}").contextSensitive().build();
    private final JavaTemplate setter = JavaTemplate
            .builder("" + "public void set#{}(#{} #{}) {this.#{} = #{};}").contextSensitive().build();

    public GenerateGetterAndSetterVisitor(String fieldName) {
        this.fieldName = fieldName;
        this.capitalizedFieldName = StringUtils.capitalize(fieldName);
    }

    @Override
    public J.VariableDeclarations.NamedVariable visitVariable(J.VariableDeclarations.NamedVariable variable, P p) {
        if (variable.isField(getCursor()) && variable.getSimpleName().equals(fieldName)) {
            getCursor().putMessageOnFirstEnclosing(J.ClassDeclaration.class, "varCursor", getCursor());
        }
        return super.visitVariable(variable, p);
    }

    @Override
    public J.MethodDeclaration visitMethodDeclaration(J.MethodDeclaration method, P p) {
        J.MethodDeclaration mi = super.visitMethodDeclaration(method, p);

        if (mi.getSimpleName().equals("get" + capitalizedFieldName) || mi.getSimpleName().equals("is" + capitalizedFieldName)) {
            getCursor().dropParentUntil(J.ClassDeclaration.class::isInstance).putMessage("getter-exists", true);
        }
        if (mi.getSimpleName().equals("set" + capitalizedFieldName)) {
            getCursor().dropParentUntil(J.ClassDeclaration.class::isInstance).putMessage("setter-exists", true);
        }
        return mi;
    }

    @Override
    public J.ClassDeclaration visitClassDeclaration(J.ClassDeclaration classDecl, P p) {
        J.ClassDeclaration c = super.visitClassDeclaration(classDecl, p);
        Cursor varCursor = getCursor().pollMessage("varCursor");
        if (varCursor != null) {
            J.VariableDeclarations.NamedVariable var = varCursor.getValue();
            JavaType.FullyQualified fullyQualified = TypeUtils.asFullyQualified(var.getType());
            JavaType.Primitive primitive = TypeUtils.asPrimitive(var.getType());

            String getterPrefix = "get";
            String fieldType = null;

            if (primitive != null) {
                getterPrefix = primitive == JavaType.Primitive.Boolean ? "is" : "get";
                fieldType = primitive.getKeyword();
            } else if (fullyQualified != null) {
                fieldType = fullyQualified.getClassName();
            }
            if (getCursor().pollMessage("getter-exists") == null) {
                Statement getterStatement = maybeAutoFormat(c, c.withBody(
                        getter.apply(
                                new Cursor(getCursor(), c.getBody().withStatements(emptyList())),
                                c.getBody().getCoordinates().lastStatement(),
                                fieldType, getterPrefix + capitalizedFieldName, var.getName()
                        )), p).getBody().getStatements().get(0);
                c = c.withBody(c.getBody().withStatements(ListUtils.concat(c.getBody().getStatements(), getterStatement)));
            }
            if (getCursor().pollMessage("setter-exists") == null) {
                Statement setterStatement = maybeAutoFormat(c, c.withBody(
                        setter.apply(
                                new Cursor(getCursor(), c.getBody().withStatements(emptyList())),
                                c.getBody().getCoordinates().lastStatement(),
                                capitalizedFieldName, fieldType, var.getSimpleName(), var.getSimpleName(), var.getSimpleName()
                        )), p).getBody().getStatements().get(0);
                c = c.withBody(c.getBody().withStatements(ListUtils.concat(c.getBody().getStatements(), setterStatement)));
            }
        }
        return c;
    }
}