// Copyright (C) 2013 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.restapi.change;

import com.google.common.base.MoreObjects;
import com.google.gerrit.common.data.SubmitTypeRecord;
import com.google.gerrit.extensions.client.SubmitType;
import com.google.gerrit.extensions.common.TestSubmitRuleInput;
import com.google.gerrit.extensions.common.TestSubmitRuleInput.Filters;
import com.google.gerrit.extensions.restapi.AuthException;
import com.google.gerrit.extensions.restapi.BadRequestException;
import com.google.gerrit.extensions.restapi.Response;
import com.google.gerrit.extensions.restapi.RestModifyView;
import com.google.gerrit.extensions.restapi.RestReadView;
import com.google.gerrit.server.change.RevisionResource;
import com.google.gerrit.server.project.SubmitRuleEvaluator;
import com.google.gerrit.server.project.SubmitRuleOptions;
import com.google.gerrit.server.query.change.ChangeData;
import com.google.gerrit.server.rules.RulesCache;
import com.google.inject.Inject;
import org.kohsuke.args4j.Option;

public class TestSubmitType implements RestModifyView<RevisionResource, TestSubmitRuleInput> {
  private final ChangeData.Factory changeDataFactory;
  private final RulesCache rules;
  private final SubmitRuleEvaluator.Factory submitRuleEvaluatorFactory;

  @Option(name = "--filters", usage = "impact of filters in parent projects")
  private Filters filters = Filters.RUN;

  @Inject
  TestSubmitType(
      ChangeData.Factory changeDataFactory,
      RulesCache rules,
      SubmitRuleEvaluator.Factory submitRuleEvaluatorFactory) {
    this.changeDataFactory = changeDataFactory;
    this.rules = rules;
    this.submitRuleEvaluatorFactory = submitRuleEvaluatorFactory;
  }

  @Override
  public Response<SubmitType> apply(RevisionResource rsrc, TestSubmitRuleInput input)
      throws AuthException, BadRequestException {
    if (input == null) {
      input = new TestSubmitRuleInput();
    }
    if (input.rule != null && !rules.isProjectRulesEnabled()) {
      throw new AuthException("project rules are disabled");
    }
    input.filters = MoreObjects.firstNonNull(input.filters, filters);

    SubmitRuleOptions opts =
        SubmitRuleOptions.builder()
            .logErrors(false)
            .skipFilters(input.filters == Filters.SKIP)
            .rule(input.rule)
            .build();

    SubmitRuleEvaluator evaluator = submitRuleEvaluatorFactory.create(opts);
    ChangeData cd = changeDataFactory.create(rsrc.getNotes());
    SubmitTypeRecord rec = evaluator.getSubmitType(cd);

    if (rec.status != SubmitTypeRecord.Status.OK) {
      throw new BadRequestException(String.format("rule produced invalid result: %s", rec));
    }

    return Response.ok(rec.type);
  }

  public static class Get implements RestReadView<RevisionResource> {
    private final TestSubmitType test;

    @Inject
    Get(TestSubmitType test) {
      this.test = test;
    }

    @Override
    public Response<SubmitType> apply(RevisionResource resource)
        throws AuthException, BadRequestException {
      return test.apply(resource, null);
    }
  }
}