//
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 */

import ResearchKit
import ResearchKitUI
import XCTest

enum ORKIdentifier: String {
    case instructionStep1,
        questionStep1,
        questionStep2,
        questionStep3,
        questionStep4,
        completionStep1,
        orderedTask1
}

class FauxTaskViewController: NSObject, ORKTaskViewControllerDelegate {

    var expectation: XCTestExpectation?

    func taskViewController(_ taskViewController: ORKTaskViewController, didFinishWith reason: ORKTaskFinishReason, error: Error?) {
        if reason == .completed {
            expectation?.fulfill()
        }
    }

    func taskViewControllerSupportsSaveAndRestore(_ taskViewController: ORKTaskViewController) -> Bool {
        return true
    }
}

final class ORKTaskViewControllerTests: XCTestCase {

    var taskCompletionExpectation: XCTestExpectation?

    var options = [
        ORKTextChoice(
            text: "Banana",
            value: 1 as NSCopying & NSSecureCoding & NSObjectProtocol
        ),
        ORKTextChoice(
            text: "Lychee",
            value: 2 as NSCopying & NSSecureCoding & NSObjectProtocol
        ),
        ORKTextChoice(
            text: "Kiwi",
            value: 3 as NSCopying & NSSecureCoding & NSObjectProtocol
        ),
        ORKTextChoice(
            text: "Orange",
            value: 4 as NSCopying & NSSecureCoding & NSObjectProtocol
        ),
    ]

    override func setUpWithError() throws {
        try super.setUpWithError()

        taskCompletionExpectation = nil

        taskCompletionExpectation = XCTestExpectation(description: "TaskCompletion")

    }

    func createTask() -> ORKOrderedTask {
        // Step 1
        let instructionStep1 = ORKInstructionStep(identifier: ORKIdentifier.instructionStep1.rawValue)

        // Step 2
        let q1AnswerFormat = ORKNumericAnswerFormat(style: .integer)

        let questionStep1 = ORKQuestionStep(
            identifier: ORKIdentifier.questionStep1.rawValue,
            title: "First Question Title",
            question: "What is your age?",
            answer: q1AnswerFormat
        )

        // Step 3
        let q2AnswerFormat = ORKTextAnswerFormat()

        let questionStep2 = ORKQuestionStep(
            identifier: ORKIdentifier.questionStep2.rawValue,
            title: "Title for Second Question",
            question: "What is your name?",
            answer: q2AnswerFormat
        )

        // Step 4
        let q3AnswerFormat = ORKTextChoiceAnswerFormat(
            style: .singleChoice,
            textChoices: options
        )

        let questionStep3 = ORKQuestionStep(
            identifier: ORKIdentifier.questionStep3.rawValue,
            title: "Question 3",
            question: "What is your favorite fruit?",
            answer: q3AnswerFormat
        )

        // Step 5
        let q4AnswerFormat = ORKScaleAnswerFormat(
            maximumValue: 10,
            minimumValue: 1,
            defaultValue: 5,
            step: 1
        )

        let questionStep4 = ORKQuestionStep(
            identifier: ORKIdentifier.questionStep4.rawValue,
            title: "Question 4",
            question: "How many fingers do you have?",
            answer: q4AnswerFormat
        )

        // Step 6
        let completionStep1 = ORKCompletionStep(
            identifier: ORKIdentifier.completionStep1.rawValue
        )

        let task = ORKOrderedTask(
            identifier: ORKIdentifier.orderedTask1.rawValue,
            steps: [
                instructionStep1,
                questionStep1,
                questionStep2,
                questionStep3,
                questionStep4,
                completionStep1,
            ]
        )
        return task
    }

    func testTaskSerialization() {

        let task = createTask()
        let taskRunUUID = UUID()
        let initialTaskViewController = ORKTaskViewController(
            task: task,
            taskRun: taskRunUUID
        )
        let delegate = FauxTaskViewController()
        delegate.expectation = taskCompletionExpectation
        initialTaskViewController.delegate = delegate

        mockPresentTaskViewController(taskViewController: initialTaskViewController)

        wait(for: [taskCompletionExpectation!], timeout: 2.0)

        guard let restoredData = initialTaskViewController.restorationData else {
            XCTFail("Unable to get restoration data for task")
            return
        }

        let restoredTaskViewController = ORKTaskViewController(
            task: task,
            restorationData: restoredData,
            delegate: FauxTaskViewController(),
            error: nil
        )

        let initialResult = initialTaskViewController.result
        let restoredResult = restoredTaskViewController.result

        XCTAssertEqual(initialTaskViewController.task?.identifier, restoredTaskViewController.task?.identifier)
        XCTAssertEqual(initialResult.results?.count, restoredResult.results?.count)

        initialResult.results?.enumerated().forEach({ index, stepResult in
            guard
                let resCount = restoredResult.results?.count,
                index < resCount,
                let stepResult = stepResult as? ORKStepResult,
                let restoredStepResult = restoredResult.results?[index] as? ORKStepResult
            else {
                XCTFail("Unable to get same result after restoring with data")
                return
            }

            XCTAssertEqual(stepResult.identifier, restoredStepResult.identifier)

            switch stepResult.identifier {

            case ORKIdentifier.instructionStep1.rawValue, ORKIdentifier.completionStep1.rawValue:
                break
            case ORKIdentifier.questionStep1.rawValue:
                guard
                    let numericResult = stepResult.results?.first as? ORKNumericQuestionResult,
                    let restoredNumericResult = restoredStepResult.results?.first as? ORKNumericQuestionResult
                else {
                    XCTFail("Incorrect step result format")
                    return
                }
                XCTAssertEqual(numericResult.numericAnswer, restoredNumericResult.numericAnswer)

            case ORKIdentifier.questionStep2.rawValue:
                guard
                    let textResult = stepResult.results?.first as? ORKTextQuestionResult,
                    let restoredTextResult = restoredStepResult.results?.first as? ORKTextQuestionResult
                else {
                    XCTFail("Incorrect step result format")
                    return
                }
                XCTAssertEqual(textResult.textAnswer, restoredTextResult.textAnswer)

            case ORKIdentifier.questionStep3.rawValue:
                guard
                    let choiceResult = stepResult.results?.first as? ORKChoiceQuestionResult,
                    let restoredChoiceResult = restoredStepResult.results?.first as? ORKChoiceQuestionResult
                else {
                    XCTFail("Incorrect step result format")
                    return
                }
                XCTAssertEqual(choiceResult.answer as? Int, restoredChoiceResult.answer as? Int)

            case ORKIdentifier.questionStep4.rawValue:
                guard
                    let scaleResult = stepResult.results?.first as? ORKScaleQuestionResult,
                    let restoredScaleResult = restoredStepResult.results?.first as? ORKScaleQuestionResult
                else {
                    XCTFail("Incorrect step result format")
                    return
                }
                XCTAssertEqual(scaleResult.scaleAnswer, restoredScaleResult.scaleAnswer)
            default:
                XCTFail("Unidentifiable step identifier")
            }
        })
    }

    func mockPresentTaskViewController(taskViewController: ORKTaskViewController) {
        guard
            let orderedTask = taskViewController.task as? ORKOrderedTask,
            orderedTask.steps.isEmpty == false
        else {
            XCTFail("Incorrect number of steps in task")
            return
        }

        for step in orderedTask.steps {
            taskViewController.flipToPage(withIdentifier: step.identifier, forward: true, animated: false)

            guard
                let currentStepViewController = taskViewController.currentStepViewController
            else {
                XCTFail("Unable to find next StepViewController")
                return
            }

            switch step.identifier {
            case ORKIdentifier.instructionStep1.rawValue, ORKIdentifier.completionStep1.rawValue:
                break
            case ORKIdentifier.questionStep1.rawValue:
                let result = ORKNumericQuestionResult(identifier: step.identifier)
                result.questionType = .integer
                let answer = 31 as NSNumber
                result.numericAnswer = answer
                currentStepViewController.addResult(result)

            case ORKIdentifier.questionStep2.rawValue:
                let result = ORKTextQuestionResult(identifier: step.identifier)
                result.questionType = .text
                let answer = "SAMPLETEXT"
                result.textAnswer = answer
                currentStepViewController.addResult(result)

            case ORKIdentifier.questionStep3.rawValue:

                let result = ORKChoiceQuestionResult(identifier: step.identifier)
                result.questionType = .singleChoice
                guard
                    let answer = options.last?.value
                else {
                    return
                }
                result.choiceAnswers = [answer]
                currentStepViewController.addResult(result)

            case ORKIdentifier.questionStep4.rawValue:
                let result = ORKScaleQuestionResult(identifier: step.identifier)
                result.questionType = .scale
                let answer = 6 as NSNumber
                result.scaleAnswer = answer
                currentStepViewController.addResult(result)

            default:
                XCTFail("Unidentifiable step identifier")
            }

            taskViewController.stepViewController(currentStepViewController, didFinishWith: .forward)
        }
    }
}