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package io.dico.dicore.command.registration.reflect;
import io.dico.dicore.command.*;
import io.dico.dicore.command.annotation.Cmd;
import io.dico.dicore.command.annotation.GenerateCommands;
import io.dico.dicore.command.parameter.type.IParameterTypeSelector;
import org.bukkit.command.CommandSender;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.lang.reflect.Modifier;
public final class ReflectiveCommand extends Command {
private static final int continuationMask = 1 << 3;
private final Cmd cmdAnnotation;
private final Method method;
private final Object instance;
private String[] parameterOrder;
// hasContinuation | hasContext | hasSender | hasReceiver
private final int flags;
ReflectiveCommand(IParameterTypeSelector selector, Method method, Object instance) throws CommandParseException {
if (!method.isAnnotationPresent(Cmd.class)) {
throw new CommandParseException("No @Cmd present for the method " + method.toGenericString());
}
cmdAnnotation = method.getAnnotation(Cmd.class);
java.lang.reflect.Parameter[] parameters = method.getParameters();
if (!method.isAccessible()) try {
method.setAccessible(true);
} catch (Exception ex) {
throw new CommandParseException("Failed to make method accessible");
}
if (!Modifier.isStatic(method.getModifiers())) {
if (instance == null) {
try {
instance = method.getDeclaringClass().newInstance();
} catch (Exception ex) {
throw new CommandParseException("No instance given for instance method, and failed to create new instance", ex);
}
} else if (!method.getDeclaringClass().isInstance(instance)) {
throw new CommandParseException("Given instance is not an instance of the method's declaring class");
}
}
this.method = method;
this.instance = instance;
this.flags = ReflectiveRegistration.parseCommandAttributes(selector, method, this, parameters);
}
public Method getMethod() {
return method;
}
public Object getInstance() {
return instance;
}
public String getCmdName() { return cmdAnnotation.value(); }
void setParameterOrder(String[] parameterOrder) {
this.parameterOrder = parameterOrder;
}
ICommandAddress getAddress() {
ChildCommandAddress result = new ChildCommandAddress();
result.setCommand(this);
Cmd cmd = cmdAnnotation;
result.getNames().add(cmd.value());
for (String alias : cmd.aliases()) {
result.getNames().add(alias);
}
result.finalizeNames();
GenerateCommands generateCommands = method.getAnnotation(GenerateCommands.class);
if (generateCommands != null) {
ReflectiveRegistration.generateCommands(result, generateCommands.value());
}
return result;
}
@Override
public String execute(CommandSender sender, ExecutionContext context) throws CommandException {
String[] parameterOrder = this.parameterOrder;
int extraArgumentCount = Integer.bitCount(flags);
int parameterStartIndex = Integer.bitCount(flags & ~continuationMask);
Object[] args = new Object[parameterOrder.length + extraArgumentCount];
int i = 0;
int mask = 1;
if ((flags & mask) != 0) {
// Has receiver
try {
args[i++] = ((ICommandInterceptor) instance).getReceiver(context, method, getCmdName());
} catch (Exception ex) {
handleException(ex);
return null; // unreachable
}
}
mask <<= 1;
if ((flags & mask) != 0) {
// Has sender
args[i++] = sender;
}
mask <<= 1;
if ((flags & mask) != 0) {
// Has context
args[i++] = context;
}
mask <<= 1;
if ((flags & mask) != 0) {
// Has continuation
extraArgumentCount--;
}
for (int n = args.length; i < n; i++) {
args[i] = context.get(parameterOrder[i - extraArgumentCount]);
}
if ((flags & mask) != 0) {
// Since it has continuation, call as coroutine
return callAsCoroutine(context, args);
}
return callSynchronously(args);
}
private boolean isSuspendFunction() {
try {
return KotlinReflectiveRegistrationKt.isSuspendFunction(method);
} catch (Throwable ex) {
return false;
}
}
public String callSynchronously(Object[] args) throws CommandException {
try {
return getResult(method.invoke(instance, args), null);
} catch (Exception ex) {
return getResult(null, ex);
}
}
public static String getResult(Object returned, Exception ex) throws CommandException {
if (ex != null) {
handleException(ex);
return null; // unreachable
}
if (returned instanceof String) {
return (String) returned;
}
return null;
}
public static void handleException(Exception ex) throws CommandException {
if (ex instanceof InvocationTargetException) {
if (ex.getCause() instanceof CommandException) {
throw (CommandException) ex.getCause();
}
ex.printStackTrace();
throw new CommandException("An internal error occurred while executing this command.", ex);
}
if (ex instanceof CommandException) {
throw (CommandException) ex;
}
ex.printStackTrace();
throw new CommandException("An internal error occurred while executing this command.", ex);
}
private String callAsCoroutine(ExecutionContext context, Object[] args) {
return KotlinReflectiveRegistrationKt.callAsCoroutine(this, (ICommandInterceptor) instance, context, args);
}
}
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