/*
 * Copyright 2013-2015 Sergey Ignatov, Alexander Zolotov, Florin Patan
 *
 * 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.goide.dlv.breakpoint;

import com.goide.GoFileType;
import com.goide.GoParserDefinition;
import com.goide.dlv.DlvDebugProcess;
import com.intellij.openapi.editor.Document;
import com.intellij.openapi.fileEditor.FileDocumentManager;
import com.intellij.openapi.project.Project;
import com.intellij.openapi.vfs.VirtualFile;
import com.intellij.psi.PsiElement;
import com.intellij.psi.tree.IElementType;
import com.intellij.util.Processor;
import com.intellij.xdebugger.XDebuggerUtil;
import com.intellij.xdebugger.breakpoints.XLineBreakpointType;
import org.jetbrains.annotations.NotNull;
import org.jetbrains.annotations.Nullable;

public class DlvBreakpointType extends XLineBreakpointType<DlvBreakpointProperties> {
  public static final String ID = "DlvLineBreakpoint";
  public static final String NAME = "Dlv breakpoint";

  protected DlvBreakpointType() {
    super(ID, NAME);
  }

  @Nullable
  @Override
  public DlvBreakpointProperties createBreakpointProperties(@NotNull VirtualFile file, int line) {
    return new DlvBreakpointProperties();
  }

  @Override
  public boolean canPutAt(@NotNull VirtualFile file, int line, @NotNull Project project) {
    if (line < 0 || DlvDebugProcess.IS_DLV_DISABLED || file.getFileType() != GoFileType.INSTANCE) return false;
    return isLineBreakpointAvailable(file, line, project);
  }

  private static boolean isLineBreakpointAvailable(@NotNull VirtualFile file, int line, @NotNull Project project) {
    Document document = FileDocumentManager.getInstance().getDocument(file);
    if (document == null || document.getLineEndOffset(line) == document.getLineStartOffset(line)) return false;
    Checker canPutAtChecker = new Checker();
    XDebuggerUtil.getInstance().iterateLine(project, document, line, canPutAtChecker);
    return canPutAtChecker.isLineBreakpointAvailable();
  }

  private static final class Checker implements Processor<PsiElement> {
    private boolean myIsLineBreakpointAvailable;

    @Override
    public boolean process(@NotNull PsiElement o) {
      IElementType type = o.getNode().getElementType();
      if (GoParserDefinition.COMMENTS.contains(type) || GoParserDefinition.WHITESPACES.contains(type)) {
        return true;
      }
      myIsLineBreakpointAvailable = true;
      return false;
    }

    public boolean isLineBreakpointAvailable() {
      return myIsLineBreakpointAvailable;
    }
  }
}