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/*
 * Copyright 2013 ArcBees Inc.
 *
 * 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 com.gwtplatform.dispatch.rpc.client;

import com.google.gwt.user.client.rpc.AsyncCallback;
import com.gwtplatform.common.client.IndirectProvider;
import com.gwtplatform.dispatch.client.DelegatingDispatchRequest;
import com.gwtplatform.dispatch.client.DispatchCall;
import com.gwtplatform.dispatch.client.ExceptionHandler;
import com.gwtplatform.dispatch.client.GwtHttpDispatchRequest;
import com.gwtplatform.dispatch.client.OldDelegatingAsyncCallback;
import com.gwtplatform.dispatch.client.actionhandler.ClientActionHandler;
import com.gwtplatform.dispatch.client.actionhandler.ClientActionHandlerRegistry;
import com.gwtplatform.dispatch.rpc.shared.Action;
import com.gwtplatform.dispatch.rpc.shared.DispatchServiceAsync;
import com.gwtplatform.dispatch.rpc.shared.Result;
import com.gwtplatform.dispatch.shared.DispatchRequest;
import com.gwtplatform.dispatch.shared.SecurityCookieAccessor;

/**
 * A class representing an undo call to be sent to the server using RPC.
 *
 * @param  the {@link Action} type.
 * @param  the {@link Result} type for this action.
 */
public class RpcDispatchUndoCall, R extends Result> extends DispatchCall {
    private static class AsyncCallbackWrapper implements AsyncCallback {
        private final AsyncCallback wrapped;

        AsyncCallbackWrapper(AsyncCallback wrapped) {
            this.wrapped = wrapped;
        }

        @Override
        public void onFailure(Throwable caught) {
            wrapped.onFailure(caught);
        }

        @Override
        public void onSuccess(R result) {
            wrapped.onSuccess(null);
        }
    }

    private final DispatchServiceAsync dispatchService;
    private final RpcDispatchHooks dispatchHooks;
    private final ClientActionHandlerRegistry clientActionHandlerRegistry;
    private final R result;

    RpcDispatchUndoCall(
            DispatchServiceAsync dispatchService,
            ExceptionHandler exceptionHandler,
            ClientActionHandlerRegistry clientActionHandlerRegistry,
            SecurityCookieAccessor securityCookieAccessor,
            RpcDispatchHooks dispatchHooks,
            A action,
            R result,
            AsyncCallback callback) {
        super(exceptionHandler, securityCookieAccessor, action, new AsyncCallbackWrapper(callback));

        this.dispatchService = dispatchService;
        this.dispatchHooks = dispatchHooks;
        this.clientActionHandlerRegistry = clientActionHandlerRegistry;
        this.result = result;
    }

    @Override
    public DispatchRequest execute() {
        dispatchHooks.onExecute(getAction(), true);

        // TODO: Add support for intercepting undo calls

        // Maintaining support for client action handlers
        DispatchRequest dispatchRequest = findClientActionHandlerRequest();
        if (dispatchRequest == null) {
            return processCall();
        } else {
            return dispatchRequest;
        }
    }

    @Override
    protected DispatchRequest processCall() {
        return new GwtHttpDispatchRequest(dispatchService.undo(getSecurityCookie(), getAction(), result,
                new AsyncCallback() {
                    @Override
                    public void onFailure(Throwable caught) {
                        RpcDispatchUndoCall.this.onExecuteFailure(caught);

                        dispatchHooks.onFailure(getAction(), caught, true);
                    }

                    @Override
                    public void onSuccess(Void nothing) {
                        RpcDispatchUndoCall.this.onExecuteSuccess(result);

                        dispatchHooks.onSuccess(getAction(), result, true);
                    }
                }
        ));
    }

    /**
     * @deprecated Since 1.4.
     */
    @Deprecated
    private DispatchRequest findClientActionHandlerRequest() {
        DispatchRequest request = null;

        A action = getAction();
        IndirectProvider> clientActionHandlerProvider =
                clientActionHandlerRegistry.find(action.getClass());

        if (clientActionHandlerProvider != null) {
            DelegatingDispatchRequest dispatchRequest = new DelegatingDispatchRequest();
            OldDelegatingAsyncCallback delegatingCallback =
                    new OldDelegatingAsyncCallback(this, action, getCallback(), dispatchRequest);

            clientActionHandlerProvider.get(delegatingCallback);

            request = dispatchRequest;
        }
        return request;
    }
}