/*
 * Copyright 2016 The Bazel Authors. All rights reserved.
 *
 * 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.google.idea.blaze.base.run.filter;

import com.google.idea.blaze.base.lang.buildfile.references.BuildReferenceManager;
import com.google.idea.blaze.base.lang.buildfile.references.LabelUtils;
import com.google.idea.blaze.base.model.primitives.Label;
import com.intellij.execution.filters.Filter;
import com.intellij.execution.filters.HyperlinkInfo;
import com.intellij.openapi.project.Project;
import com.intellij.psi.NavigatablePsiElement;
import com.intellij.psi.PsiElement;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import org.jetbrains.annotations.Nullable;

/** Parse blaze targets in streamed output. */
public class BlazeTargetFilter implements Filter {

  private static final Pattern TARGET_PATTERN = Pattern.compile("//([^\\s:]*):(\\S*)");

  private final Project project;

  public BlazeTargetFilter(Project project) {
    this.project = project;
  }

  @Nullable
  @Override
  public Result applyFilter(String line, int entireLength) {
    Matcher matcher = TARGET_PATTERN.matcher(line);
    if (!matcher.find()) {
      return null;
    }
    String labelString = matcher.group();
    Label label = LabelUtils.createLabelFromString(null, labelString);
    if (label == null) {
      return null;
    }
    PsiElement psi = BuildReferenceManager.getInstance(project).resolveLabel(label);
    if (!(psi instanceof NavigatablePsiElement)) {
      return null;
    }
    HyperlinkInfo link = project -> ((NavigatablePsiElement) psi).navigate(true);
    int offset = entireLength - line.length();
    return new Result(matcher.start() + offset, matcher.end() + offset, link);
  }
}