/*
 * Copyright 2013-2017 consulo.io
 *
 * 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 consulo.csharp.ide.codeInsight.actions;

import org.jetbrains.annotations.NotNull;
import org.jetbrains.annotations.Nullable;
import consulo.csharp.ide.refactoring.CSharpGenerateUtil;
import consulo.csharp.lang.psi.CSharpBodyWithBraces;
import consulo.csharp.lang.psi.CSharpContextUtil;
import consulo.csharp.lang.psi.CSharpReferenceExpression;
import com.intellij.codeInsight.intention.impl.BaseIntentionAction;
import com.intellij.codeInsight.template.Template;
import com.intellij.codeInsight.template.TemplateManager;
import com.intellij.ide.IdeBundle;
import com.intellij.openapi.application.ApplicationNamesInfo;
import com.intellij.openapi.command.WriteCommandAction;
import com.intellij.openapi.editor.Editor;
import com.intellij.openapi.editor.ScrollType;
import com.intellij.openapi.fileEditor.FileEditorManager;
import com.intellij.openapi.fileEditor.OpenFileDescriptor;
import com.intellij.openapi.fileEditor.ex.FileEditorProviderManager;
import com.intellij.openapi.project.Project;
import com.intellij.openapi.ui.Messages;
import com.intellij.openapi.vfs.VirtualFile;
import com.intellij.psi.PsiDocumentManager;
import com.intellij.psi.PsiElement;
import com.intellij.psi.PsiFile;
import com.intellij.psi.SmartPointerManager;
import com.intellij.psi.SmartPsiElementPointer;
import com.intellij.util.ArrayUtil;
import com.intellij.util.IncorrectOperationException;
import consulo.annotations.RequiredReadAction;
import consulo.annotations.RequiredWriteAction;
import consulo.dotnet.psi.DotNetMemberOwner;
import consulo.dotnet.psi.DotNetNamedElement;

/**
 * @author VISTALL
 * @since 06.01.15
 */
public abstract class CreateUnresolvedElementFix extends BaseIntentionAction
{
	protected final SmartPsiElementPointer<CSharpReferenceExpression> myPointer;
	protected final String myReferenceName;

	public CreateUnresolvedElementFix(CSharpReferenceExpression expression)
	{
		myPointer = SmartPointerManager.getInstance(expression.getProject()).createSmartPsiElementPointer(expression);
		myReferenceName = expression.getReferenceName();
	}

	protected abstract CreateUnresolvedElementFixContext createGenerateContext();

	@Override
	public boolean isAvailable(@NotNull Project project, Editor editor, PsiFile file)
	{
		return createGenerateContext() != null;
	}

	@NotNull
	@Override
	public abstract String getText();

	@RequiredReadAction
	public abstract void buildTemplate(@NotNull CreateUnresolvedElementFixContext context,
			CSharpContextUtil.ContextType contextType,
			@NotNull PsiFile file,
			@NotNull Template template);

	@NotNull
	public PsiElement getElementForAfterAdd(@NotNull DotNetNamedElement[] elements, @NotNull CSharpBodyWithBraces targetForGenerate)
	{
		return ArrayUtil.getLastElement(elements);
	}

	@Override
	@RequiredWriteAction
	public void invoke(@NotNull Project project, final Editor editor, PsiFile file) throws IncorrectOperationException
	{
		PsiDocumentManager.getInstance(project).commitAllDocuments();
		final CreateUnresolvedElementFixContext generateContext = createGenerateContext();
		if(generateContext == null)
		{
			return;
		}

		CSharpContextUtil.ContextType contextType = CSharpContextUtil.getParentContextTypeForReference(generateContext.getExpression());

		final TemplateManager templateManager = TemplateManager.getInstance(project);
		final Template template = templateManager.createTemplate("", "");
		template.setToReformat(true);

		template.addTextSegment("\n\n");
		buildTemplate(generateContext, contextType, file, template);

		new WriteCommandAction.Simple<Object>(project, file)
		{
			@Override
			protected void run() throws Throwable
			{
				DotNetMemberOwner targetForGenerate = generateContext.getTargetForGenerate();

				assert targetForGenerate instanceof CSharpBodyWithBraces;

				Editor editorForAdd;
				DotNetNamedElement[] members = targetForGenerate.getMembers();
				if(members.length == 0)
				{
					CSharpGenerateUtil.normalizeBraces((CSharpBodyWithBraces) targetForGenerate);

					PsiElement leftBrace = ((CSharpBodyWithBraces) targetForGenerate).getLeftBrace();

					editorForAdd = openEditor(leftBrace, leftBrace.getTextOffset() + 1);
				}
				else
				{
					PsiElement lastElement = getElementForAfterAdd(members, (CSharpBodyWithBraces) targetForGenerate);

					editorForAdd = openEditor(lastElement, lastElement.getTextRange().getEndOffset());
				}

				if(editorForAdd == null)
				{
					return;
				}

				templateManager.startTemplate(editorForAdd, template);
			}
		}.execute();
	}

	@Nullable
	protected static Editor openEditor(@NotNull PsiElement anchor, int offset)
	{
		PsiFile containingFile = anchor.getContainingFile();
		if(containingFile == null)
		{
			return null;
		}
		VirtualFile virtualFile = containingFile.getVirtualFile();
		if(virtualFile == null)
		{
			return null;
		}

		Project project = containingFile.getProject();
		FileEditorProviderManager editorProviderManager = FileEditorProviderManager.getInstance();
		if(editorProviderManager.getProviders(project, virtualFile).length == 0)
		{
			Messages.showMessageDialog(project, IdeBundle.message("error.files.of.this.type.cannot.be.opened", ApplicationNamesInfo.getInstance()
					.getProductName()), IdeBundle.message("title.cannot.open.file"), Messages.getErrorIcon());
			return null;
		}

		OpenFileDescriptor descriptor = new OpenFileDescriptor(project, virtualFile);
		Editor editor = FileEditorManager.getInstance(project).openTextEditor(descriptor, true);
		if(editor != null)
		{
			editor.getCaretModel().moveToOffset(offset);
			editor.getScrollingModel().scrollToCaret(ScrollType.RELATIVE);
			return editor;
		}
		return null;
	}

	@NotNull
	@Override
	public String getFamilyName()
	{
		return "C#";
	}
}