/*******************************************************************************
 * Copyright (c) 2010 György Orosz.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors:
 *     György Orosz - initial API and implementation
 ******************************************************************************/
package org.erlide.wrangler.refactoring.core.internal;

import org.eclipse.core.runtime.CoreException;
import org.eclipse.core.runtime.IProgressMonitor;
import org.eclipse.core.runtime.OperationCanceledException;
import org.eclipse.ltk.core.refactoring.RefactoringStatus;
import org.eclipse.swt.widgets.Shell;
import org.erlide.runtime.rpc.RpcResult;
import org.erlide.wrangler.refactoring.backend.IRefactoringRpcMessage;
import org.erlide.wrangler.refactoring.backend.RefactoringState;
import org.erlide.wrangler.refactoring.backend.internal.WranglerBackendManager;
import org.erlide.wrangler.refactoring.core.CostumWorkflowRefactoring;
import org.erlide.wrangler.refactoring.core.RefactoringWorkflowController;
import org.erlide.wrangler.refactoring.selection.IErlMemberSelection;
import org.erlide.wrangler.refactoring.selection.IErlSelection;
import org.erlide.wrangler.refactoring.util.GlobalParameters;
import org.erlide.wrangler.refactoring.util.IErlRange;

import com.ericsson.otp.erlang.OtpErlangString;

/**
 * Rename function refactoring integration
 *
 * @author Gyorgy Orosz
 * @version %I%, %G%
 */
public class RenameFunctionRefactoring extends CostumWorkflowRefactoring {

    @Override
    public RefactoringStatus checkInitialConditions(final IProgressMonitor pm)
            throws CoreException, OperationCanceledException {
        /*
         * IErlSelection sel = GlobalParameters.getWranglerSelection(); if (sel
         * instanceof IErlMemberSelection) { SelectionKind kind = sel.getKind();
         * if (kind == SelectionKind.FUNCTION_CLAUSE || kind ==
         * SelectionKind.FUNCTION) return new RefactoringStatus(); } return
         * RefactoringStatus
         * .createFatalErrorStatus("Please select a function!");
         */
        return new RefactoringStatus();
    }

    @Override
    public String getName() {
        return "Rename function";
    }

    @Override
    public IRefactoringRpcMessage run(final IErlSelection selection) {
        final IErlMemberSelection sel = (IErlMemberSelection) selection;
        final IErlRange memberRange = sel.getSelectionRange();

        return WranglerBackendManager.getRefactoringBackend().call("rename_fun_eclipse",
                "siisxi", sel.getFilePath(), memberRange.getStartLine(),
                memberRange.getStartCol(), userInput, sel.getSearchPath(),
                GlobalParameters.getTabWidth());
    }

    @Override
    public IRefactoringRpcMessage runAlternative(final IErlSelection selection) {
        final IErlMemberSelection sel = (IErlMemberSelection) selection;
        final IErlRange memberRange = sel.getMemberRange();

        return WranglerBackendManager.getRefactoringBackend().call("rename_fun_1_eclipse",
                "siisxi", sel.getFilePath(), memberRange.getStartLine(),
                memberRange.getStartCol(), userInput, sel.getSearchPath(),
                GlobalParameters.getTabWidth());
    }

    @Override
    public RefactoringWorkflowController getWorkflowController(final Shell shell) {
        return new RefactoringWorkflowController(shell) {

            @Override
            public void doRefactoring() {
                final IErlSelection sel = GlobalParameters.getWranglerSelection();
                IRefactoringRpcMessage message = run(sel);
                if (message.isSuccessful()) {
                    changedFiles = message.getRefactoringChangeset();
                    status = new RefactoringStatus();
                } else if (message.getRefactoringState() == RefactoringState.WARNING) {
                    if (ask("Warning", message.getMessageString())) {
                        message = runAlternative(sel);
                        if (message.getRefactoringState() == RefactoringState.OK) {
                            status = new RefactoringStatus();
                        } else {
                            status = RefactoringStatus
                                    .createFatalErrorStatus(message.getMessageString());
                        }
                    } else {
                        stop();
                    }
                } else {
                    status = RefactoringStatus
                            .createFatalErrorStatus(message.getMessageString());
                }
            }

        };
    }

    @Override
    public String getDefaultValue() {
        final IErlMemberSelection sel = (IErlMemberSelection) GlobalParameters
                .getWranglerSelection();
        if (sel == null) {
            return "";
        }

        final RpcResult res = WranglerBackendManager.getRefactoringBackend()
                .callWithoutParser("get_fun_name_eclipse", "siixi", sel.getFilePath(),
                        sel.getSelectionRange().getStartLine(),
                        sel.getSelectionRange().getStartCol(), sel.getSearchPath(),
                        GlobalParameters.getTabWidth());

        if (res.getValue().getClass().equals(OtpErlangString.class)) {
            return ((OtpErlangString) res.getValue()).stringValue();
        }
        return "";
    }
}