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This module implements a command-line tool for running basic commands against a Hotmoka node.
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/*
Copyright 2021 Fausto Spoto

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 io.hotmoka.moka.internal;

import java.lang.annotation.Annotation;
import java.lang.reflect.Constructor;
import java.lang.reflect.Executable;
import java.lang.reflect.Method;
import java.util.Comparator;
import java.util.List;
import java.util.concurrent.TimeoutException;
import java.util.stream.Collectors;
import java.util.stream.Stream;

import io.hotmoka.helpers.ClassLoaderHelpers;
import io.hotmoka.node.api.CodeExecutionException;
import io.hotmoka.node.api.Node;
import io.hotmoka.node.api.NodeException;
import io.hotmoka.node.api.TransactionException;
import io.hotmoka.node.api.TransactionRejectedException;
import io.hotmoka.node.api.UnknownReferenceException;
import io.hotmoka.node.api.updates.ClassTag;
import io.hotmoka.verification.api.TakamakaClassLoader;
import io.hotmoka.whitelisting.api.WhiteListingWizard;
import io.takamaka.code.constants.Constants;

class PrintAPI {
	private final Class clazz;
	private final WhiteListingWizard whiteListingWizard;

	PrintAPI(Node node, ClassTag tag) throws ClassNotFoundException, TransactionRejectedException, TransactionException, CodeExecutionException, NodeException, TimeoutException, InterruptedException, UnknownReferenceException {
		TakamakaClassLoader classloader = ClassLoaderHelpers.of(node).classloaderFor(tag.getJar());
		this.clazz = classloader.loadClass(tag.getClazz().getName());
		this.whiteListingWizard = classloader.getWhiteListingWizard();
		printConstructors();
		printMethods();
	}

	private void printMethods() throws ClassNotFoundException {
		Comparator comparator = Comparator.comparing(Method::getName)
			.thenComparing(Method::toString);

		Method[] methods = clazz.getMethods();
		List defined = Stream.of(methods)
			.sorted(comparator)
			.filter(method -> method.getDeclaringClass() == clazz)
			.collect(Collectors.toList());

		for (Method method: defined)
			printMethod(method);

		List inherited = Stream.of(methods)
			.sorted(comparator)
			.filter(method -> method.getDeclaringClass() != clazz)
			.collect(Collectors.toList());

		for (Method method: inherited)
			printInheritedMethod(method);

		if (methods.length > 0)
			System.out.println();
	}

	private void printConstructors() throws ClassNotFoundException {
		Constructor[] constructors = clazz.getConstructors();
		for (Constructor constructor: constructors)
			printConstructor(constructor);

		if (constructors.length > 0)
			System.out.println();
	}

	private void printConstructor(Constructor constructor) {
		Class clazz = constructor.getDeclaringClass();
		System.out.println(AbstractCommand.ANSI_RESET + "  "
			+ annotationsAsString(constructor)
			+ constructor.toString().replace(clazz.getName() + "(", clazz.getSimpleName() + "(")
			+ (whiteListingWizard.whiteListingModelOf(constructor).isEmpty() ? (AbstractCommand.ANSI_RED + " \u274c") : ""));
	}

	private String annotationsAsString(Executable executable) {
		String prefix = Constants.IO_TAKAMAKA_CODE_LANG_PACKAGE_NAME;
		String result = Stream.of(executable.getAnnotations())
			.filter(annotation -> annotation.annotationType().getName().startsWith(prefix))
			.map(Annotation::toString)
			.collect(Collectors.joining(" "))
			.replace(prefix, "")
			.replace("()", "")
			.replace("(Contract.class)", "");

		if (result.isEmpty())
			return "";
		else
			return AbstractCommand.ANSI_RED + result + AbstractCommand.ANSI_RESET + ' ';
	}

	private void printMethod(Method method) {
		System.out.println(AbstractCommand.ANSI_RESET + "  "
			+ annotationsAsString(method)
			+ method.toString().replace(method.getDeclaringClass().getName() + "." + method.getName(), method.getName())
			+ (whiteListingWizard.whiteListingModelOf(method).isEmpty() ? (AbstractCommand.ANSI_RED + " \u274c") : ""));
	}

	private void printInheritedMethod(Method method) {
		Class definingClass = method.getDeclaringClass();
		System.out.println(AbstractCommand.ANSI_CYAN + "\u25b2 "
			+ annotationsAsString(method) + AbstractCommand.ANSI_CYAN
			+ method.toString().replace(method.getDeclaringClass().getName() + "." + method.getName(), method.getName())
			+ AbstractCommand.ANSI_GREEN + " (inherited from " + definingClass.getName() + ")"
			+ (whiteListingWizard.whiteListingModelOf(method).isEmpty() ? (AbstractCommand.ANSI_RED + " \u274c") : ""));
	}
}