/*
 * Copyright 2000-2016 JetBrains s.r.o.
 *
 * 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.intellij.codeInspection.streamMigration;

import com.intellij.codeInspection.streamMigration.StreamApiMigrationInspection.MapOp;
import com.intellij.openapi.project.Project;
import com.intellij.psi.*;
import org.jetbrains.annotations.NotNull;

/**
 * @author Tagir Valeev
 */
class ReplaceWithSumFix extends MigrateToStreamFix {

  @NotNull
  @Override
  public String getFamilyName() {
    return "Replace with sum()";
  }

  @Override
  PsiElement migrate(@NotNull Project project,
                     @NotNull PsiLoopStatement loopStatement,
                     @NotNull PsiStatement body,
                     @NotNull StreamApiMigrationInspection.TerminalBlock tb) {
    PsiAssignmentExpression assignment = tb.getSingleExpression(PsiAssignmentExpression.class);
    if (assignment == null) return null;
    PsiVariable var = StreamApiMigrationInspection.extractAccumulator(assignment);
    if (var == null) return null;

    PsiExpression addend = StreamApiMigrationInspection.extractAddend(assignment);
    if (addend == null) return null;
    PsiType type = var.getType();
    if (!(type instanceof PsiPrimitiveType) || type.equals(PsiType.FLOAT)) return null;
    if (!type.equals(PsiType.DOUBLE) && !type.equals(PsiType.LONG)) {
      type = PsiType.INT;
    }
    StringBuilder builder = generateStream(new MapOp(tb.getLastOperation(), addend, tb.getVariable(), type));
    builder.append(".sum()");
    return replaceWithNumericAddition(project, loopStatement, var, builder, type);
  }
}
