//
//  Copyright (c) 2021 Open Whisper Systems. All rights reserved.
//

import XCTest
import SignalServiceKit
@testable import Signal

struct VerificationFailedError: Error { }
struct FailedToGetRPRegistrationTokenError: Error { }

enum PushNotificationRequestResult: String {
    case failTSOnly = "FailTSOnly"
    case failRPOnly = "FailRPOnly"
    case failBoth = "FailBoth"
    case succeed = "Succeed"
}

class FailingTSAccountManager: TSAccountManager {
    override public init() {
        AssertIsOnMainThread()

        super.init()

        self.phoneNumberAwaitingVerification = "+13235555555"
    }

    override func verifyRegistration(request: TSRequest,
                                     success successBlock: @escaping (Any?) -> Void,
                                     failure failureBlock: @escaping (Error) -> Void) {
        failureBlock(VerificationFailedError())
    }

    override func registerForPushNotifications(pushToken: String,
                                               voipToken: String?,
                                               success successHandler: @escaping () -> Void,
                                               failure failureHandler: @escaping (Error) -> Void) {
        if pushToken == PushNotificationRequestResult.failTSOnly.rawValue || pushToken == PushNotificationRequestResult.failBoth.rawValue {
            failureHandler(OWSGenericError("Missing or invalid push token."))
        } else {
            successHandler()
        }
    }
}

class VerifyingTSAccountManager: FailingTSAccountManager {
    override func verifyRegistration(request: TSRequest,
                                     success successBlock: @escaping (Any?) -> Void,
                                     failure failureBlock: @escaping (Error) -> Void) {
        successBlock(["uuid": UUID().uuidString])
    }
}

class TokenObtainingTSAccountManager: VerifyingTSAccountManager {
}

class VerifyingPushRegistrationManager: PushRegistrationManager {
    public override func requestPushTokens() -> Promise<(pushToken: String, voipToken: String?)> {
        return Promise.value(("a", "b"))
    }
}

class AccountManagerTest: SignalBaseTest {

    override func setUp() {
        super.setUp()

        let tsAccountManager = FailingTSAccountManager()
        let sskEnvironment = SSKEnvironment.shared as! MockSSKEnvironment
        sskEnvironment.tsAccountManagerRef = tsAccountManager
    }

    override func tearDown() {
        super.tearDown()
    }

    func testRegisterWhenEmptyCode() {
        let accountManager = AccountManager()

        let expectation = self.expectation(description: "should fail")

        firstly {
            accountManager.register(verificationCode: "", pin: "", checkForAvailableTransfer: false)
        }.done {
            XCTFail("Should fail")
        }.catch { error in
            let nserror = error as NSError
            if OWSErrorCode(rawValue: nserror.code) == OWSErrorCode.userError {
                expectation.fulfill()
            } else {
                XCTFail("Unexpected error: \(error)")
            }
        }

        self.waitForExpectations(timeout: 1.0, handler: nil)
    }

    func testRegisterWhenVerificationFails() {
        let accountManager = AccountManager()

        let expectation = self.expectation(description: "should fail")

        firstly {
            accountManager.register(verificationCode: "123456", pin: "", checkForAvailableTransfer: false)
        }.done {
            XCTFail("Should fail")
        }.catch { error in
            if error is VerificationFailedError {
                expectation.fulfill()
            } else {
                XCTFail("Unexpected error: \(error)")
            }
        }

        self.waitForExpectations(timeout: 1.0, handler: nil)
    }

    func testSuccessfulRegistration() {
        let tsAccountManager = TokenObtainingTSAccountManager()
        let sskEnvironment = SSKEnvironment.shared as! MockSSKEnvironment
        sskEnvironment.tsAccountManagerRef = tsAccountManager

        AppEnvironment.shared.pushRegistrationManagerRef = VerifyingPushRegistrationManager()

        let accountManager = AccountManager()

        let expectation = self.expectation(description: "should succeed")

        firstly {
            accountManager.register(verificationCode: "123456", pin: "", checkForAvailableTransfer: false)
        }.done {
            expectation.fulfill()
        }.catch { error in
            XCTFail("Unexpected error: \(error)")
        }

        self.waitForExpectations(timeout: 5.0, handler: nil)
    }

    func testUpdatePushTokens() {
        let accountManager = AccountManager()

        let expectation = self.expectation(description: "should fail")

        firstly {
            accountManager.updatePushTokens(pushToken: PushNotificationRequestResult.failTSOnly.rawValue, voipToken: "whatever")
        }.done {
            XCTFail("Expected to fail.")
        }.catch { _ in
            expectation.fulfill()
        }

        self.waitForExpectations(timeout: 1.0, handler: nil)
    }
}