/*
 * Copyright 2005, Sixth and Red River Software
 *
 *  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.sixrr.metrics.utils;

import com.intellij.openapi.editor.Editor;
import com.intellij.openapi.fileEditor.FileEditor;
import com.intellij.openapi.fileEditor.FileEditorManager;
import com.intellij.openapi.fileEditor.TextEditor;
import com.intellij.openapi.project.Project;
import com.intellij.openapi.vfs.VirtualFile;
import com.intellij.psi.PsiElement;
import com.intellij.psi.PsiFile;
import org.jetbrains.annotations.Nullable;

class PluginPsiUtil {
    private PluginPsiUtil() {
        super();
    }

    @Nullable
    private static VirtualFile getVirtualFile(PsiElement psiElement) {
        if (psiElement == null) {
            return null;
        }
        final PsiFile containingFile = psiElement.getContainingFile();
        if (containingFile == null) {
            return null;
        }
        return containingFile.getVirtualFile();
    }

    public static boolean isElementInSelectedFile(Project project,
                                                  PsiElement psiElement) {
        final VirtualFile elementFile = getVirtualFile(psiElement);
        if (elementFile == null) {
            return false;
        }
        final FileEditorManager fileEditorManager = FileEditorManager.getInstance(project);
        final VirtualFile[] currentEditedFiles = fileEditorManager.getSelectedFiles();

        for (final VirtualFile file : currentEditedFiles) {
            if (elementFile.equals(file)) {
                return true;
            }
        }
        return false;
    }

    @Nullable
    public static Editor getEditorIfSelected(Project project,
                                             PsiElement psiElement) {
        final VirtualFile elementFile = getVirtualFile(psiElement);
        if (elementFile == null) {
            return null;
        }

        final FileEditorManager fileEditorManager = FileEditorManager.getInstance(project);
        final FileEditor fileEditor = fileEditorManager.getSelectedEditor(elementFile);

        Editor editor = null;

        if (fileEditor != null && fileEditor instanceof TextEditor) {
            editor = ((TextEditor) fileEditor).getEditor();
        }

        return editor;
    }
}