//
// Copyright 2022 Google LLC
//
// 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.

import XCTest

@testable import FirebaseSessions

class SessionStartEventTests: XCTestCase {
  var identifiers: MockIdentifierProvider!
  var time: MockTimeProvider!
  var appInfo: MockApplicationInfo!

  override func setUp() {
    super.setUp()

    identifiers = MockIdentifierProvider()
    time = MockTimeProvider()
    appInfo = MockApplicationInfo()
  }

  /// This function runs the `testCase` twice, once for the proto object stored in
  /// the event, and once after encoding and decoding the proto. This is useful for
  /// testing cases where the proto hasn't been encoded correctly.
  func testProtoAndDecodedProto(sessionEvent: SessionStartEvent,
                                testCase: (firebase_appquality_sessions_SessionEvent) -> Void) {
    let proto = sessionEvent.proto
    testCase(proto)

    /// If you are getting failures in this test case, and not the one above, the
    /// problem likely lies in encoding the proto
    let decodedProto = sessionEvent.encodeDecodeEvent()
    testCase(decodedProto)
  }

  func test_init_setsSessionIDs() {
    identifiers.mockAllValidIDs()

    let event = SessionStartEvent(identifiers: identifiers, appInfo: appInfo, time: time)

    testProtoAndDecodedProto(sessionEvent: event) { proto in
      assertEqualProtoString(
        proto.session_data.session_id,
        expected: MockIdentifierProvider.testSessionID,
        fieldName: "session_id"
      )
      assertEqualProtoString(
        proto.session_data.previous_session_id,
        expected: MockIdentifierProvider.testPreviousSessionID,
        fieldName: "previous_session_id"
      )

      XCTAssertEqual(proto.session_data.event_timestamp_us, 123)
    }
  }

  func test_init_setsApplicationInfo() {
    appInfo.mockAllInfo()

    let event = SessionStartEvent(identifiers: identifiers, appInfo: appInfo, time: time)

    testProtoAndDecodedProto(sessionEvent: event) { proto in
      assertEqualProtoString(
        proto.application_info.app_id,
        expected: MockApplicationInfo.testAppID,
        fieldName: "app_id"
      )
      assertEqualProtoString(
        proto.application_info.session_sdk_version,
        expected: MockApplicationInfo.testSDKVersion,
        fieldName: "session_sdk_version"
      )
      assertEqualProtoString(
        proto.application_info.apple_app_info.bundle_short_version,
        expected: MockApplicationInfo.testBundleID,
        fieldName: "bundle_short_version"
      )
      assertEqualProtoString(
        proto.application_info.apple_app_info.mcc_mnc,
        expected: MockApplicationInfo.testMCCMNC,
        fieldName: "mcc_mnc"
      )

      // Ensure we convert the test OS name into the enum.
      XCTAssertEqual(
        proto.application_info.apple_app_info.os_name,
        firebase_appquality_sessions_OsName_IOS
      )
    }
  }

  func test_setInstallationID_setsInstallationID() {
    identifiers.mockAllValidIDs()

    let event = SessionStartEvent(identifiers: identifiers, appInfo: appInfo, time: time)
    event.setInstallationID(identifiers: identifiers)

    testProtoAndDecodedProto(sessionEvent: event) { proto in
      assertEqualProtoString(
        proto.session_data.firebase_installation_id,
        expected: MockIdentifierProvider.testInstallationID,
        fieldName: "firebase_installation_id"
      )
    }
  }

  func test_convertOSName_convertsCorrectly() {
    let expectations: [(given: String, expected: firebase_appquality_sessions_OsName)] = [
      ("macos", firebase_appquality_sessions_OsName_MACOS),
      ("maccatalyst", firebase_appquality_sessions_OsName_MACCATALYST),
      ("ios_on_mac", firebase_appquality_sessions_OsName_IOS_ON_MAC),
      ("ios", firebase_appquality_sessions_OsName_IOS),
      ("tvos", firebase_appquality_sessions_OsName_TVOS),
      ("watchos", firebase_appquality_sessions_OsName_WATCHOS),
      ("ipados", firebase_appquality_sessions_OsName_IPADOS),
      ("something unknown", firebase_appquality_sessions_OsName_UNKNOWN_OSNAME),
    ]

    expectations.forEach { (given: String, expected: firebase_appquality_sessions_OsName) in
      appInfo.osName = given

      let event = SessionStartEvent(identifiers: identifiers, appInfo: appInfo, time: time)

      testProtoAndDecodedProto(sessionEvent: event) { proto in
        XCTAssertEqual(event.proto.application_info.apple_app_info.os_name, expected)
      }
    }
  }

  func test_convertLogEnvironment_convertsCorrectly() {
    let expectations: [(given: DevEnvironment, expected: firebase_appquality_sessions_LogEnvironment)] = [
      (.prod, firebase_appquality_sessions_LogEnvironment_LOG_ENVIRONMENT_PROD),
      (.staging, firebase_appquality_sessions_LogEnvironment_LOG_ENVIRONMENT_STAGING),
      (.autopush, firebase_appquality_sessions_LogEnvironment_LOG_ENVIRONMENT_AUTOPUSH),
    ]

    expectations.forEach { (given: DevEnvironment, expected: firebase_appquality_sessions_LogEnvironment) in
      appInfo.environment = given

      let event = SessionStartEvent(identifiers: identifiers, appInfo: appInfo, time: time)

      XCTAssertEqual(event.proto.application_info.log_environment, expected)
    }
  }
}