/*
 * Copyright 2021 Red Hat, Inc. and/or its affiliates.
 *
 * 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.kie.kogito.codegen.process;

import java.util.Optional;

import org.drools.core.util.StringUtils;
import org.jbpm.compiler.canonical.TriggerMetaData;
import org.kie.api.definition.process.WorkflowProcess;
import org.kie.kogito.codegen.api.context.KogitoBuildContext;
import org.kie.kogito.codegen.api.template.InvalidTemplateException;
import org.kie.kogito.codegen.api.template.TemplatedGenerator;
import org.kie.kogito.codegen.core.BodyDeclarationComparator;
import org.kie.kogito.codegen.core.CodegenUtils;

import com.github.javaparser.ast.CompilationUnit;
import com.github.javaparser.ast.body.ClassOrInterfaceDeclaration;
import com.github.javaparser.ast.body.ConstructorDeclaration;
import com.github.javaparser.ast.expr.StringLiteralExpr;
import com.github.javaparser.ast.type.ClassOrInterfaceType;

public class MessageProducerGenerator {

    protected static final String EVENT_DATA_VAR = "eventData";

    protected final TemplatedGenerator generator;

    private final String processPackageName;
    protected final String resourceClazzName;
    private final String processName;
    protected final String messageDataEventClassName;
    protected final KogitoBuildContext context;
    protected WorkflowProcess process;
    private String processId;

    protected TriggerMetaData trigger;

    private final Optional<String> eventEmitterName;

    public MessageProducerGenerator(
            KogitoBuildContext context,
            WorkflowProcess process,
            String modelfqcn,
            String processfqcn,
            String messageDataEventClassName,
            TriggerMetaData trigger,
            Optional<String> eventEmitterName) {
        this(context, process, modelfqcn, processfqcn, messageDataEventClassName, trigger, "MessageProducer", eventEmitterName);
    }

    public MessageProducerGenerator(
            KogitoBuildContext context,
            WorkflowProcess process,
            String modelfqcn,
            String processfqcn,
            String messageDataEventClassName,
            TriggerMetaData trigger,
            String templateName,
            Optional<String> eventEmitterName) {
        this.context = context;
        this.process = process;
        this.trigger = trigger;
        this.processPackageName = process.getPackageName();
        this.processId = process.getId();
        this.processName = processId.substring(processId.lastIndexOf('.') + 1);
        String classPrefix = StringUtils.ucFirst(processName);
        this.resourceClazzName = classPrefix + "MessageProducer_" + trigger.getOwnerId();
        this.messageDataEventClassName = messageDataEventClassName;
        this.eventEmitterName = eventEmitterName;

        this.generator = TemplatedGenerator.builder()
                .withTargetTypeName(resourceClazzName)
                .withPackageName(processPackageName)
                .build(context, templateName);
    }

    public String generate() {
        CompilationUnit clazz = generator.compilationUnitOrThrow("Cannot generate message producer");

        ClassOrInterfaceDeclaration template = clazz.findFirst(ClassOrInterfaceDeclaration.class)
                .orElseThrow(() -> new InvalidTemplateException(
                        generator,
                        "Cannot find class declaration"));
        template.setName(resourceClazzName);
        template.findAll(ConstructorDeclaration.class).forEach(cd -> cd.setName(resourceClazzName));

        template.findAll(ClassOrInterfaceType.class).forEach(cls -> CodegenUtils.interpolateTypes(cls, trigger.getDataType()));
        template.findAll(StringLiteralExpr.class).forEach(str -> str.setString(str.asString().replace("$Trigger$", trigger.getName())));
        template.findAll(StringLiteralExpr.class).forEach(str -> str.setString(str.asString().replace("$ClassName$", resourceClazzName)));
        if (eventEmitterName.isPresent()) {
            template.findAll(StringLiteralExpr.class).forEach(str -> str.setString(str.asString().replace("$BeanName$", eventEmitterName.get())));
        }
        template.findAll(ClassOrInterfaceType.class).forEach(t -> t.setName(t.getNameAsString().replace("$DataEventType$", messageDataEventClassName)));
        template.findAll(ClassOrInterfaceType.class).forEach(t -> t.setName(t.getNameAsString().replace("$DataType$", trigger.getDataType())));
        template.findAll(StringLiteralExpr.class).forEach(s -> s.setString(s.getValue().replace("$channel$", trigger.getName())));

        template.getMembers().sort(new BodyDeclarationComparator());
        return clazz.toString();
    }

    public String className() {
        return resourceClazzName;
    }

    public String generatedFilePath() {
        return generator.generatedFilePath();
    }
}
