content: /*
   *  This file is part of AndroidIDE.
   *
   *  AndroidIDE is free software: you can redistribute it and/or modify
   *  it under the terms of the GNU General Public License as published by
   *  the Free Software Foundation, either version 3 of the License, or
   *  (at your option) any later version.
   *
   *  AndroidIDE is distributed in the hope that it will be useful,
   *  but WITHOUT ANY WARRANTY; without even the implied warranty of
   *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   *  GNU General Public License for more details.
   *
   *  You should have received a copy of the GNU General Public License
   *   along with AndroidIDE.  If not, see <https://www.gnu.org/licenses/>.
   */
  
  package com.itsaky.androidide.lsp.java.rewrite;
  
  import androidx.annotation.NonNull;
  import com.itsaky.androidide.lsp.java.compiler.CompilerProvider;
  import com.itsaky.androidide.lsp.java.compiler.SynchronizedTask;
  import com.itsaky.androidide.lsp.java.utils.FindHelper;
  import com.itsaky.androidide.lsp.models.TextEdit;
  import com.itsaky.androidide.models.Position;
  import com.itsaky.androidide.models.Range;
  import java.nio.file.Path;
  import java.util.Collections;
  import java.util.Map;
  import jdkx.lang.model.element.ExecutableElement;
  import openjdk.source.util.Trees;
  
  public class AddException extends Rewrite {
  
    final String className, methodName;
    final String[] erasedParameterTypes;
    final String exceptionType;
  
    public AddException(String className, String methodName, String[] erasedParameterTypes,
        String exceptionType
    ) {
      this.className = className;
      this.methodName = methodName;
      this.erasedParameterTypes = erasedParameterTypes;
      this.exceptionType = exceptionType;
    }
  
    @NonNull
    @Override
    public Map<Path, TextEdit[]> rewrite(@NonNull CompilerProvider compiler) {
      Path file = compiler.findTypeDeclaration(className);
      if (file == CompilerProvider.NOT_FOUND) {
        return CANCELLED;
      }
  
      SynchronizedTask synchronizedTask = compiler.compile(file);
      return synchronizedTask.get(task -> {
        Trees trees = Trees.instance(task.task);
        final var type = task.task.getElements().getTypeElement(className);
        if (type == null) {
          return CANCELLED;
        }
  
        ExecutableElement methodElement = FindHelper.findMethod(task, className, methodName,
            erasedParameterTypes);
        if (methodElement == null) {
          return CANCELLED;
        }
  
        final var methodTree = trees.getTree(methodElement);
        if (methodTree == null || methodTree.getBody() == null) {
          return CANCELLED;
        }
  
        final var pos = trees.getSourcePositions();
        final var lines = task.root().getLineMap();
  
        final var index = pos.getStartPosition(task.root(), methodTree.getBody());
        int line = (int) lines.getLineNumber(index);
        int column = (int) lines.getColumnNumber(index);
        Position insertPos = new Position(line - 1, column - 1);
        String simpleName = exceptionType;
        int lastDot = simpleName.lastIndexOf('.');
        if (lastDot != -1) {
          simpleName = exceptionType.substring(lastDot + 1);
        }
  
        String insertText;
        if (methodTree.getThrows().isEmpty()) {
          insertText = "throws " + simpleName + " ";
        } else {
          insertText = ", " + simpleName + " ";
        }
  
        TextEdit insertThrows = new TextEdit(new Range(insertPos, insertPos), insertText);
        // TODO add import if needed
        TextEdit[] edits = {insertThrows};
        return Collections.singletonMap(file, edits);
      });
    }
  }
  