// Copyright 2016 The Bazel Authors. All rights reserved.
//
// 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.devtools.build.lib.rules.apple;

import com.google.common.annotations.VisibleForTesting;
import com.google.common.base.Optional;
import com.google.common.base.Strings;
import com.google.devtools.build.lib.concurrent.ThreadSafety.Immutable;
import com.google.devtools.build.lib.packages.NativeInfo;
import com.google.devtools.build.lib.packages.NativeProvider;
import com.google.devtools.build.lib.skylarkbuildapi.apple.XcodePropertiesApi;
import java.util.Objects;
import javax.annotation.Nullable;

/** A tuple containing information about a version of xcode and its properties. */
@Immutable
public class XcodeVersionProperties extends NativeInfo implements XcodePropertiesApi {

  /** Starlark name for the XcodeVersionProperties provider. */
  public static final String SKYLARK_NAME = "XcodeProperties";

  /** Starlark constructor and identifier for XcodeVersionProperties provider. */
  public static final NativeProvider<XcodeVersionProperties> SKYLARK_CONSTRUCTOR =
      new NativeProvider<XcodeVersionProperties>(XcodeVersionProperties.class, SKYLARK_NAME) {};

  @VisibleForTesting public static final String DEFAULT_IOS_SDK_VERSION = "8.4";
  @VisibleForTesting public static final String DEFAULT_WATCHOS_SDK_VERSION = "2.0";
  @VisibleForTesting public static final String DEFAULT_MACOS_SDK_VERSION = "10.10";
  @VisibleForTesting public static final String DEFAULT_TVOS_SDK_VERSION = "9.0";

  private final Optional<DottedVersion> xcodeVersion;
  private final DottedVersion defaultIosSdkVersion;
  private final DottedVersion defaultWatchosSdkVersion;
  private final DottedVersion defaultTvosSdkVersion;
  private final DottedVersion defaultMacosSdkVersion;

  /**
   * Creates and returns a tuple representing no known xcode property information (defaults are used
   * where applicable).
   */
  // TODO(bazel-team): The xcode version should be a well-defined value, either specified by the
  // user, evaluated on the local system, or set to a sensible default.
  // Unfortunately, until the local system evaluation hook is created, this constraint would break
  // some users.
  public static XcodeVersionProperties unknownXcodeVersionProperties() {
    return new XcodeVersionProperties(null);
  }

  /**
   * Constructor for when only the xcode version is specified, but no property information is
   * specified.
   */
  XcodeVersionProperties(DottedVersion xcodeVersion) {
    this(xcodeVersion, null, null, null, null);
  }

  /**
   * General constructor. Some (nullable) properties may be left unspecified. In these cases, a
   * semi-sensible default will be assigned to the property value.
   */
  XcodeVersionProperties(
      DottedVersion xcodeVersion,
      @Nullable String defaultIosSdkVersion,
      @Nullable String defaultWatchosSdkVersion,
      @Nullable String defaultTvosSdkVersion,
      @Nullable String defaultMacosSdkVersion) {
    super(SKYLARK_CONSTRUCTOR);
    this.xcodeVersion = Optional.fromNullable(xcodeVersion);
    this.defaultIosSdkVersion =
        Strings.isNullOrEmpty(defaultIosSdkVersion)
            ? DottedVersion.fromStringUnchecked(DEFAULT_IOS_SDK_VERSION)
            : DottedVersion.fromStringUnchecked(defaultIosSdkVersion);
    this.defaultWatchosSdkVersion =
        Strings.isNullOrEmpty(defaultWatchosSdkVersion)
            ? DottedVersion.fromStringUnchecked(DEFAULT_WATCHOS_SDK_VERSION)
            : DottedVersion.fromStringUnchecked(defaultWatchosSdkVersion);
    this.defaultTvosSdkVersion =
        Strings.isNullOrEmpty(defaultTvosSdkVersion)
            ? DottedVersion.fromStringUnchecked(DEFAULT_TVOS_SDK_VERSION)
            : DottedVersion.fromStringUnchecked(defaultTvosSdkVersion);
    this.defaultMacosSdkVersion =
        Strings.isNullOrEmpty(defaultMacosSdkVersion)
            ? DottedVersion.fromStringUnchecked(DEFAULT_MACOS_SDK_VERSION)
            : DottedVersion.fromStringUnchecked(defaultMacosSdkVersion);
  }

  /** Returns the xcode version, or null if the xcode version is unknown. */
  @Override
  public String getXcodeVersionString() {
    if (xcodeVersion.isPresent()) {
      return xcodeVersion.get().toString();
    }
    return null;
  }

  /** Returns the default ios sdk version to use if this xcode version is in use. */
  @Override
  public String getDefaultIosSdkVersionString() {
    return defaultIosSdkVersion != null ? defaultIosSdkVersion.toString() : null;
  }

  /** Returns the default watchos sdk version to use if this xcode version is in use. */
  @Override
  public String getDefaultWatchosSdkVersionString() {
    return defaultWatchosSdkVersion != null ? defaultWatchosSdkVersion.toString() : null;
  }

  /** Returns the default tvos sdk version to use if this xcode version is in use. */
  @Override
  public String getDefaultTvosSdkVersionString() {
    return defaultTvosSdkVersion != null ? defaultTvosSdkVersion.toString() : null;
  }

  /** Returns the default macosx sdk version to use if this xcode version is in use. */
  @Override
  public String getDefaultMacosSdkVersionString() {
    return defaultMacosSdkVersion != null ? defaultMacosSdkVersion.toString() : null;
  }

  /** Returns the xcode version, or {@link Optional#absent} if the xcode version is unknown. */
  public Optional<DottedVersion> getXcodeVersion() {
    return xcodeVersion;
  }

  @Nullable
  public DottedVersion getDefaultIosSdkVersion() {
    return defaultIosSdkVersion;
  }

  @Nullable
  public DottedVersion getDefaultWatchosSdkVersion() {
    return defaultWatchosSdkVersion;
  }

  @Nullable
  public DottedVersion getDefaultTvosSdkVersion() {
    return defaultTvosSdkVersion;
  }

  @Nullable
  public DottedVersion getDefaultMacosSdkVersion() {
    return defaultMacosSdkVersion;
  }

  @Override
  public boolean equals(Object other) {
    if (other == null) {
      return false;
    }
    if (!(other instanceof XcodeVersionProperties)) {
      return false;
    }
    XcodeVersionProperties otherData = (XcodeVersionProperties) other;
    return xcodeVersion.equals(otherData.getXcodeVersion())
        && defaultIosSdkVersion.equals(otherData.getDefaultIosSdkVersion())
        && defaultWatchosSdkVersion.equals(otherData.getDefaultWatchosSdkVersion())
        && defaultTvosSdkVersion.equals(otherData.getDefaultTvosSdkVersion())
        && defaultMacosSdkVersion.equals(otherData.getDefaultMacosSdkVersion());
  }

  @Override
  public int hashCode() {
    return Objects.hash(
        xcodeVersion,
        defaultIosSdkVersion,
        defaultWatchosSdkVersion,
        defaultTvosSdkVersion,
        defaultMacosSdkVersion);
  }
}