/*
 * 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
 *
 *      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.camel.quarkus.component.joor.deployment;

import java.util.ArrayList;
import java.util.List;
import java.util.Objects;
import java.util.function.BooleanSupplier;
import java.util.stream.Collectors;

import io.quarkus.bootstrap.model.ApplicationModel;
import io.quarkus.deployment.annotations.BuildProducer;
import io.quarkus.deployment.annotations.BuildStep;
import io.quarkus.deployment.annotations.Consume;
import io.quarkus.deployment.annotations.ExecutionTime;
import io.quarkus.deployment.annotations.Record;
import io.quarkus.deployment.builditem.FeatureBuildItem;
import io.quarkus.deployment.builditem.GeneratedClassBuildItem;
import io.quarkus.deployment.pkg.NativeConfig;
import io.quarkus.deployment.pkg.builditem.CurateOutcomeBuildItem;
import io.quarkus.maven.dependency.ResolvedDependency;
import io.quarkus.paths.PathCollection;
import io.quarkus.runtime.RuntimeValue;
import org.apache.camel.CamelContext;
import org.apache.camel.language.joor.CompilationUnit;
import org.apache.camel.language.joor.JavaLanguage;
import org.apache.camel.language.joor.JoorCompiler;
import org.apache.camel.language.joor.JoorExpression;
import org.apache.camel.language.joor.JoorScriptingCompiler;
import org.apache.camel.language.joor.MultiCompile;
import org.apache.camel.quarkus.component.joor.runtime.JoorExpressionCompiler;
import org.apache.camel.quarkus.component.joor.runtime.JoorExpressionConfig;
import org.apache.camel.quarkus.component.joor.runtime.JoorExpressionRecorder;
import org.apache.camel.quarkus.component.joor.runtime.JoorExpressionScriptingCompiler;
import org.apache.camel.quarkus.core.deployment.spi.CamelBeanBuildItem;
import org.apache.camel.quarkus.core.deployment.spi.CamelContextBuildItem;
import org.apache.camel.quarkus.core.deployment.util.CamelSupport;
import org.apache.camel.quarkus.support.language.deployment.ExpressionBuildItem;
import org.apache.camel.quarkus.support.language.deployment.ExpressionExtractionResultBuildItem;
import org.apache.camel.quarkus.support.language.deployment.ScriptBuildItem;
import org.apache.camel.quarkus.support.language.runtime.ExpressionUID;
import org.apache.camel.quarkus.support.language.runtime.ScriptUID;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

class JoorProcessor {

    private static final Logger LOG = LoggerFactory.getLogger(JoorProcessor.class);
    private static final String PACKAGE_NAME = "org.apache.camel.quarkus.component.joor.generated";
    private static final String FEATURE = "camel-joor";

    @BuildStep
    FeatureBuildItem feature() {
        return new FeatureBuildItem(FEATURE);
    }

    @BuildStep(onlyIf = CompileAtBuildTime.class)
    void collectExpressions(JoorExpressionConfig config,
            ExpressionExtractionResultBuildItem result,
            List<ExpressionBuildItem> expressions,
            List<ScriptBuildItem> scripts,
            BuildProducer<JoorExpressionSourceBuildItem> producer) throws Exception {
        if (result.isSuccess()) {
            List<ExpressionBuildItem> joorExpressions = expressions.stream()
                    .filter(exp -> "java".equals(exp.getLanguage()))
                    .collect(Collectors.toList());
            List<ScriptBuildItem> joorScripts = scripts.stream()
                    .filter(exp -> "java".equals(exp.getLanguage()))
                    .collect(Collectors.toList());
            if (joorExpressions.isEmpty() && joorScripts.isEmpty()) {
                return;
            }
            // Don't close it as it won't be started and some log entries are added on close/stop
            CamelContext ctx = CamelSupport.newBuildTimeCamelContext(true);
            try (JavaLanguage language = new JavaLanguage()) {
                language.setCamelContext(ctx);
                language.setSingleQuotes(config.singleQuotes());
                config.configResource().ifPresent(language::setConfigResource);
                language.setPreCompile(false);
                language.init();
                JoorCompiler compiler = language.getCompiler();
                for (ExpressionBuildItem expression : joorExpressions) {
                    JoorExpression exp = (JoorExpression) language.createExpression(expression.getExpression(),
                            expression.getProperties());
                    ExpressionUID id = new ExpressionUID(expression.getExpression(), exp.isSingleQuotes());
                    String name = String.format("%s.%s", PACKAGE_NAME, id);
                    String content = compiler.evalCode(ctx, name, expression.getExpression(), exp.isSingleQuotes());
                    if (LOG.isDebugEnabled()) {
                        LOG.debug("Compiling expression:\n\n{}\n", content);
                    }
                    producer.produce(new JoorExpressionSourceBuildItem(id, name, content));
                }
                JoorScriptingCompiler scriptingCompiler = language.getScriptingCompiler();
                for (ScriptBuildItem script : joorScripts) {
                    ScriptUID id = new ScriptUID(script.getContent(), script.getBindings(), language.isSingleQuotes());
                    String name = String.format("%s.%s", PACKAGE_NAME, id);
                    String content = scriptingCompiler.evalCode(ctx, name, script.getContent(), script.getBindings(),
                            language.isSingleQuotes());
                    if (LOG.isDebugEnabled()) {
                        LOG.debug("Compiling script:\n\n{}\n", content);
                    }
                    producer.produce(new JoorExpressionSourceBuildItem(id, name, content));
                }
            }
        }
    }

    @BuildStep(onlyIf = CompileAtBuildTime.class)
    void compileExpressions(
            CurateOutcomeBuildItem curateOutcomeBuildItem,
            List<JoorExpressionSourceBuildItem> sources,
            BuildProducer<GeneratedClassBuildItem> generatedClass) {
        if (sources.isEmpty()) {
            return;
        }
        CompilationUnit unit = CompilationUnit.input();
        for (JoorExpressionSourceBuildItem source : sources) {
            unit.addClass(source.getClassName(), source.getSourceCode());
        }
        ApplicationModel model = curateOutcomeBuildItem.getApplicationModel();
        List<ResolvedDependency> dependencies = new ArrayList<>(model.getDependencies());
        dependencies.add(model.getAppArtifact());
        LOG.debug("Compiling unit: {}", unit);
        CompilationUnit.Result compilationResult = MultiCompile.compileUnit(
                unit,
                List.of(
                        "-classpath",
                        dependencies.stream()
                                .map(ResolvedDependency::getResolvedPaths)
                                .flatMap(PathCollection::stream)
                                .map(Objects::toString)
                                .collect(Collectors.joining(System.getProperty("path.separator")))));
        for (String className : compilationResult.getCompiledClassNames()) {
            generatedClass
                    .produce(
                            new GeneratedClassBuildItem(true, className, compilationResult.getByteCode(className)));
        }
    }

    @Record(ExecutionTime.STATIC_INIT)
    @BuildStep(onlyIf = CompileAtBuildTime.class)
    @Consume(CamelContextBuildItem.class)
    CamelBeanBuildItem configureLanguage(
            JoorExpressionConfig config,
            JoorExpressionRecorder recorder,
            CamelContextBuildItem context,
            ExpressionExtractionResultBuildItem result,
            List<JoorExpressionSourceBuildItem> sources) {

        if (result.isSuccess() && !sources.isEmpty()) {
            final RuntimeValue<JoorExpressionCompiler.Builder> expressionCompilerBuilder = recorder
                    .expressionCompilerBuilder();
            final RuntimeValue<JoorExpressionScriptingCompiler.Builder> expressionScriptingCompilerBuilder = recorder
                    .expressionScriptingCompilerBuilder();

            RuntimeValue<CamelContext> camelContext = context.getCamelContext();
            for (JoorExpressionSourceBuildItem source : sources) {
                if (source.isScript()) {
                    recorder.addScript(
                            expressionScriptingCompilerBuilder,
                            camelContext,
                            source.getId(),
                            source.getClassName());
                } else {
                    recorder.addExpression(
                            expressionCompilerBuilder,
                            camelContext,
                            source.getId(),
                            source.getClassName());
                }
            }
            final RuntimeValue<JavaLanguage> language = recorder.languageNewInstance(config, expressionCompilerBuilder,
                    expressionScriptingCompilerBuilder);

            return new CamelBeanBuildItem("java", JavaLanguage.class.getName(), language);
        }
        return null;
    }

    /**
     * Indicates whether the jOOR expressions should be compiled at build time.
     */
    public static final class CompileAtBuildTime implements BooleanSupplier {
        JoorExpressionConfig config;
        NativeConfig nativeConfig;

        @Override
        public boolean getAsBoolean() {
            return config.compileAtBuildTime() || nativeConfig.enabled();
        }
    }
}
