// Copyright (C) 2021 The Android Open Source Project
//
// 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.gerrit.server.change;

import com.google.gerrit.entities.SubmitRequirement;
import com.google.gerrit.entities.SubmitRequirementExpression;
import com.google.gerrit.entities.SubmitRequirementExpressionResult;
import com.google.gerrit.entities.SubmitRequirementResult;
import com.google.gerrit.extensions.common.SubmitRequirementExpressionInfo;
import com.google.gerrit.extensions.common.SubmitRequirementResultInfo;

/**
 * Produces submit requirements related entities like {@link SubmitRequirementResultInfo}s, which
 * are serialized to JSON afterwards.
 */
public class SubmitRequirementsJson {
  private SubmitRequirementsJson() {}

  public static SubmitRequirementResultInfo toInfo(
      SubmitRequirement req, SubmitRequirementResult result) {
    SubmitRequirementResultInfo info = new SubmitRequirementResultInfo();
    info.name = req.name();
    info.description = req.description().orElse(null);
    if (req.applicabilityExpression().isPresent()) {
      info.applicabilityExpressionResult =
          submitRequirementExpressionToInfo(
              req.applicabilityExpression().get(),
              result.applicabilityExpressionResult().get(),
              /* hide= */ true); // Always hide applicability expressions on the API
    }
    if (req.overrideExpression().isPresent() && result.overrideExpressionResult().isPresent()) {
      info.overrideExpressionResult =
          submitRequirementExpressionToInfo(
              req.overrideExpression().get(),
              result.overrideExpressionResult().get(),
              /* hide= */ false);
    }
    if (result.submittabilityExpressionResult().isPresent()) {
      info.submittabilityExpressionResult =
          submitRequirementExpressionToInfo(
              req.submittabilityExpression(),
              result.submittabilityExpressionResult().get(),
              /* hide= */ false);
    }
    info.status = SubmitRequirementResultInfo.Status.valueOf(result.status().toString());
    info.isLegacy = result.isLegacy();
    return info;
  }

  private static SubmitRequirementExpressionInfo submitRequirementExpressionToInfo(
      SubmitRequirementExpression expression,
      SubmitRequirementExpressionResult result,
      boolean hide) {
    SubmitRequirementExpressionInfo info = new SubmitRequirementExpressionInfo();
    info.expression = hide ? null : expression.expressionString();
    info.fulfilled = result.status().equals(SubmitRequirementExpressionResult.Status.PASS);
    info.passingAtoms = hide ? null : result.passingAtoms();
    info.failingAtoms = hide ? null : result.failingAtoms();
    info.errorMessage = result.errorMessage().isPresent() ? result.errorMessage().get() : null;
    return info;
  }
}