// Copyright (C) 2016 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.testutil;

import static com.google.common.base.Preconditions.checkNotNull;

import com.google.gerrit.server.notedb.NoteDbChangeState.PrimaryStorage;
import com.google.gerrit.server.notedb.NotesMigration;
import com.google.inject.Singleton;

/** {@link NotesMigration} with bits that can be flipped live for testing. */
@Singleton
public class TestNotesMigration extends NotesMigration {
  private volatile boolean readChanges;
  private volatile boolean writeChanges;
  private volatile PrimaryStorage changePrimaryStorage = PrimaryStorage.REVIEW_DB;
  private volatile boolean disableChangeReviewDb;
  private volatile boolean fuseUpdates;
  private volatile boolean failOnLoad;

  public TestNotesMigration() {
    resetFromEnv();
  }

  @Override
  public boolean readChanges() {
    return readChanges;
  }

  @Override
  public boolean readChangeSequence() {
    // Unlike ConfigNotesMigration, read change numbers from NoteDb by default
    // when reads are enabled, to improve test coverage.
    return readChanges;
  }

  @Override
  public PrimaryStorage changePrimaryStorage() {
    return changePrimaryStorage;
  }

  @Override
  public boolean disableChangeReviewDb() {
    return disableChangeReviewDb;
  }

  @Override
  public boolean fuseUpdates() {
    return fuseUpdates;
  }

  // Increase visbility from superclass, as tests may want to check whether
  // NoteDb data is written in specific migration scenarios.
  @Override
  public boolean rawWriteChangesSetting() {
    return writeChanges;
  }

  @Override
  public boolean failOnLoad() {
    return failOnLoad;
  }

  public TestNotesMigration setReadChanges(boolean readChanges) {
    this.readChanges = readChanges;
    return this;
  }

  public TestNotesMigration setWriteChanges(boolean writeChanges) {
    this.writeChanges = writeChanges;
    return this;
  }

  public TestNotesMigration setChangePrimaryStorage(PrimaryStorage changePrimaryStorage) {
    this.changePrimaryStorage = checkNotNull(changePrimaryStorage);
    return this;
  }

  public TestNotesMigration setDisableChangeReviewDb(boolean disableChangeReviewDb) {
    this.disableChangeReviewDb = disableChangeReviewDb;
    return this;
  }

  public TestNotesMigration setFuseUpdates(boolean fuseUpdates) {
    this.fuseUpdates = fuseUpdates;
    return this;
  }

  public TestNotesMigration setFailOnLoad(boolean failOnLoad) {
    this.failOnLoad = failOnLoad;
    return this;
  }

  public TestNotesMigration setAllEnabled(boolean enabled) {
    return setReadChanges(enabled).setWriteChanges(enabled);
  }

  public TestNotesMigration resetFromEnv() {
    switch (NoteDbMode.get()) {
      case READ_WRITE:
        setWriteChanges(true);
        setReadChanges(true);
        setChangePrimaryStorage(PrimaryStorage.REVIEW_DB);
        setDisableChangeReviewDb(false);
        setFuseUpdates(false);
        break;
      case WRITE:
        setWriteChanges(true);
        setReadChanges(false);
        setChangePrimaryStorage(PrimaryStorage.REVIEW_DB);
        setDisableChangeReviewDb(false);
        setFuseUpdates(false);
        break;
      case PRIMARY:
        setWriteChanges(true);
        setReadChanges(true);
        setChangePrimaryStorage(PrimaryStorage.NOTE_DB);
        setDisableChangeReviewDb(false);
        setFuseUpdates(false);
        break;
      case DISABLE_CHANGE_REVIEW_DB:
        setWriteChanges(true);
        setReadChanges(true);
        setChangePrimaryStorage(PrimaryStorage.NOTE_DB);
        setDisableChangeReviewDb(true);
        setFuseUpdates(false);
        break;
      case FUSED:
        setWriteChanges(true);
        setReadChanges(true);
        setChangePrimaryStorage(PrimaryStorage.NOTE_DB);
        setDisableChangeReviewDb(true);
        setFuseUpdates(true);
        break;
      case CHECK:
      case OFF:
      default:
        setWriteChanges(false);
        setReadChanges(false);
        setChangePrimaryStorage(PrimaryStorage.REVIEW_DB);
        setDisableChangeReviewDb(false);
        setFuseUpdates(false);
        break;
    }
    return this;
  }

  public TestNotesMigration setFrom(NotesMigration other) {
    setWriteChanges(other.rawWriteChangesSetting());
    setReadChanges(other.readChanges());
    setChangePrimaryStorage(other.changePrimaryStorage());
    setDisableChangeReviewDb(other.disableChangeReviewDb());
    setFuseUpdates(other.fuseUpdates());
    return this;
  }
}