PlantGuide/PlantGuideTests/CoreDataCareScheduleStorageTests.swift

//
//  CoreDataCareScheduleStorageTests.swift
//  PlantGuideTests
//
//  Unit tests for CoreDataCareScheduleStorage - the Core Data implementation
//  of care schedule persistence.
//

import XCTest
import CoreData
@testable import PlantGuide

// MARK: - Mock Core Data Stack

/// Mock implementation of CoreDataStackProtocol for testing
final class MockCoreDataStack: CoreDataStackProtocol, @unchecked Sendable {

    private let persistentContainer: NSPersistentContainer

    init() {
        // Create an in-memory persistent container for testing
        let modelURL = Bundle.main.url(forResource: "PlantGuideModel", withExtension: "momd")
        let managedObjectModel: NSManagedObjectModel

        if let modelURL = modelURL {
            managedObjectModel = NSManagedObjectModel(contentsOf: modelURL)!
        } else {
            // Create a minimal model programmatically for testing if model file not found
            managedObjectModel = MockCoreDataStack.createTestModel()
        }

        persistentContainer = NSPersistentContainer(name: "PlantGuideModel", managedObjectModel: managedObjectModel)

        let description = NSPersistentStoreDescription()
        description.type = NSInMemoryStoreType
        description.shouldAddStoreAsynchronously = false
        persistentContainer.persistentStoreDescriptions = [description]

        persistentContainer.loadPersistentStores { _, error in
            if let error = error {
                fatalError("Failed to load in-memory store: \(error)")
            }
        }

        persistentContainer.viewContext.automaticallyMergesChangesFromParent = true
    }

    func viewContext() -> NSManagedObjectContext {
        return persistentContainer.viewContext
    }

    func newBackgroundContext() -> NSManagedObjectContext {
        let context = persistentContainer.newBackgroundContext()
        context.mergePolicy = NSMergeByPropertyObjectTrumpMergePolicy
        context.automaticallyMergesChangesFromParent = true
        return context
    }

    func performBackgroundTask<T: Sendable>(_ block: @escaping @Sendable (NSManagedObjectContext) throws -> T) async throws -> T {
        let context = newBackgroundContext()

        return try await withCheckedThrowingContinuation { continuation in
            context.perform {
                do {
                    let result = try block(context)

                    if context.hasChanges {
                        try context.save()
                    }

                    continuation.resume(returning: result)
                } catch {
                    continuation.resume(throwing: error)
                }
            }
        }
    }

    func save(context: NSManagedObjectContext) throws {
        guard context.hasChanges else { return }
        try context.save()
    }

    func reset() throws {
        let context = viewContext()
        let entityNames = persistentContainer.managedObjectModel.entities.compactMap { $0.name }

        for entityName in entityNames {
            let fetchRequest = NSFetchRequest<NSManagedObject>(entityName: entityName)
            let objects = try context.fetch(fetchRequest)
            for object in objects {
                context.delete(object)
            }
        }

        try save(context: context)
    }

    /// Creates a minimal test model programmatically
    private static func createTestModel() -> NSManagedObjectModel {
        let model = NSManagedObjectModel()

        // CareScheduleMO Entity
        let scheduleEntity = NSEntityDescription()
        scheduleEntity.name = "CareScheduleMO"
        scheduleEntity.managedObjectClassName = NSStringFromClass(CareScheduleMO.self)

        let scheduleIdAttr = NSAttributeDescription()
        scheduleIdAttr.name = "id"
        scheduleIdAttr.attributeType = .UUIDAttributeType

        let plantIdAttr = NSAttributeDescription()
        plantIdAttr.name = "plantID"
        plantIdAttr.attributeType = .UUIDAttributeType

        let lightReqAttr = NSAttributeDescription()
        lightReqAttr.name = "lightRequirement"
        lightReqAttr.attributeType = .stringAttributeType

        let wateringAttr = NSAttributeDescription()
        wateringAttr.name = "wateringSchedule"
        wateringAttr.attributeType = .stringAttributeType

        let tempMinAttr = NSAttributeDescription()
        tempMinAttr.name = "temperatureMin"
        tempMinAttr.attributeType = .integer32AttributeType

        let tempMaxAttr = NSAttributeDescription()
        tempMaxAttr.name = "temperatureMax"
        tempMaxAttr.attributeType = .integer32AttributeType

        let fertilizerAttr = NSAttributeDescription()
        fertilizerAttr.name = "fertilizerSchedule"
        fertilizerAttr.attributeType = .stringAttributeType

        scheduleEntity.properties = [
            scheduleIdAttr, plantIdAttr, lightReqAttr, wateringAttr,
            tempMinAttr, tempMaxAttr, fertilizerAttr
        ]

        // CareTaskMO Entity
        let taskEntity = NSEntityDescription()
        taskEntity.name = "CareTaskMO"
        taskEntity.managedObjectClassName = NSStringFromClass(CareTaskMO.self)

        let taskIdAttr = NSAttributeDescription()
        taskIdAttr.name = "id"
        taskIdAttr.attributeType = .UUIDAttributeType

        let taskPlantIdAttr = NSAttributeDescription()
        taskPlantIdAttr.name = "plantID"
        taskPlantIdAttr.attributeType = .UUIDAttributeType

        let typeAttr = NSAttributeDescription()
        typeAttr.name = "type"
        typeAttr.attributeType = .stringAttributeType

        let scheduledDateAttr = NSAttributeDescription()
        scheduledDateAttr.name = "scheduledDate"
        scheduledDateAttr.attributeType = .dateAttributeType

        let completedDateAttr = NSAttributeDescription()
        completedDateAttr.name = "completedDate"
        completedDateAttr.attributeType = .dateAttributeType
        completedDateAttr.isOptional = true

        let notesAttr = NSAttributeDescription()
        notesAttr.name = "notes"
        notesAttr.attributeType = .stringAttributeType

        taskEntity.properties = [
            taskIdAttr, taskPlantIdAttr, typeAttr, scheduledDateAttr, completedDateAttr, notesAttr
        ]

        // Relationships
        let tasksRelation = NSRelationshipDescription()
        tasksRelation.name = "tasks"
        tasksRelation.destinationEntity = taskEntity
        tasksRelation.isOptional = true
        tasksRelation.deleteRule = .cascadeDeleteRule

        let scheduleRelation = NSRelationshipDescription()
        scheduleRelation.name = "careSchedule"
        scheduleRelation.destinationEntity = scheduleEntity
        scheduleRelation.maxCount = 1
        scheduleRelation.isOptional = true

        tasksRelation.inverseRelationship = scheduleRelation
        scheduleRelation.inverseRelationship = tasksRelation

        scheduleEntity.properties.append(tasksRelation)
        taskEntity.properties.append(scheduleRelation)

        model.entities = [scheduleEntity, taskEntity]

        return model
    }
}

// MARK: - CoreDataCareScheduleStorageTests

final class CoreDataCareScheduleStorageTests: XCTestCase {

    // MARK: - Properties

    private var sut: CoreDataCareScheduleStorage!
    private var mockCoreDataStack: MockCoreDataStack!

    // MARK: - Test Lifecycle

    override func setUp() {
        super.setUp()
        mockCoreDataStack = MockCoreDataStack()
        sut = CoreDataCareScheduleStorage(coreDataStack: mockCoreDataStack)
    }

    override func tearDown() {
        try? mockCoreDataStack.reset()
        sut = nil
        mockCoreDataStack = nil
        super.tearDown()
    }

    // MARK: - Test Helpers

    private func createTestSchedule(
        id: UUID = UUID(),
        plantID: UUID = UUID(),
        lightRequirement: LightRequirement = .partialShade,
        wateringSchedule: String = "Every 3 days",
        temperatureRange: ClosedRange<Int> = 60...80,
        fertilizerSchedule: String = "Monthly during growing season",
        tasks: [CareTask] = []
    ) -> PlantCareSchedule {
        PlantCareSchedule(
            id: id,
            plantID: plantID,
            lightRequirement: lightRequirement,
            wateringSchedule: wateringSchedule,
            temperatureRange: temperatureRange,
            fertilizerSchedule: fertilizerSchedule,
            tasks: tasks
        )
    }

    private func createTestTask(
        id: UUID = UUID(),
        plantID: UUID = UUID(),
        type: CareTaskType = .watering,
        scheduledDate: Date = Date(),
        completedDate: Date? = nil,
        notes: String = ""
    ) -> CareTask {
        CareTask(
            id: id,
            plantID: plantID,
            type: type,
            scheduledDate: scheduledDate,
            completedDate: completedDate,
            notes: notes
        )
    }

    // MARK: - save() and fetch() Round-Trip Tests

    func testSaveAndFetch_WithValidSchedule_RoundTripsSuccessfully() async throws {
        // Given
        let plantID = UUID()
        let schedule = createTestSchedule(
            plantID: plantID,
            lightRequirement: .fullSun,
            wateringSchedule: "Every 2 days",
            temperatureRange: 65...75,
            fertilizerSchedule: "Weekly"
        )

        // When
        try await sut.save(schedule)
        let fetchedSchedule = try await sut.fetch(for: plantID)

        // Then
        XCTAssertNotNil(fetchedSchedule)
        XCTAssertEqual(fetchedSchedule?.plantID, plantID)
        XCTAssertEqual(fetchedSchedule?.lightRequirement, .fullSun)
        XCTAssertEqual(fetchedSchedule?.wateringSchedule, "Every 2 days")
        XCTAssertEqual(fetchedSchedule?.temperatureRange, 65...75)
        XCTAssertEqual(fetchedSchedule?.fertilizerSchedule, "Weekly")
    }

    func testSaveAndFetch_WithTasks_RoundTripsSuccessfully() async throws {
        // Given
        let plantID = UUID()
        let task1 = createTestTask(plantID: plantID, type: .watering, notes: "Water thoroughly")
        let task2 = createTestTask(plantID: plantID, type: .fertilizing, notes: "Use organic fertilizer")
        let schedule = createTestSchedule(plantID: plantID, tasks: [task1, task2])

        // When
        try await sut.save(schedule)
        let fetchedSchedule = try await sut.fetch(for: plantID)

        // Then
        XCTAssertNotNil(fetchedSchedule)
        XCTAssertEqual(fetchedSchedule?.tasks.count, 2)

        let taskTypes = fetchedSchedule?.tasks.map { $0.type } ?? []
        XCTAssertTrue(taskTypes.contains(.watering))
        XCTAssertTrue(taskTypes.contains(.fertilizing))
    }

    func testSave_WhenScheduleAlreadyExists_UpdatesExistingSchedule() async throws {
        // Given
        let plantID = UUID()
        let originalSchedule = createTestSchedule(
            plantID: plantID,
            wateringSchedule: "Weekly"
        )
        try await sut.save(originalSchedule)

        let updatedSchedule = createTestSchedule(
            plantID: plantID,
            wateringSchedule: "Every 2 days"
        )

        // When
        try await sut.save(updatedSchedule)
        let fetchedSchedule = try await sut.fetch(for: plantID)

        // Then
        XCTAssertEqual(fetchedSchedule?.wateringSchedule, "Every 2 days")

        // Verify only one schedule exists for the plant
        let allSchedules = try await sut.fetchAll()
        let schedulesForPlant = allSchedules.filter { $0.plantID == plantID }
        XCTAssertEqual(schedulesForPlant.count, 1)
    }

    func testFetch_WhenScheduleDoesNotExist_ReturnsNil() async throws {
        // Given
        let nonExistentPlantID = UUID()

        // When
        let fetchedSchedule = try await sut.fetch(for: nonExistentPlantID)

        // Then
        XCTAssertNil(fetchedSchedule)
    }

    func testSaveAndFetch_WithAllLightRequirements_RoundTripsCorrectly() async throws {
        // Test each light requirement
        for lightReq in LightRequirement.allCases {
            // Given
            let plantID = UUID()
            let schedule = createTestSchedule(plantID: plantID, lightRequirement: lightReq)

            // When
            try await sut.save(schedule)
            let fetchedSchedule = try await sut.fetch(for: plantID)

            // Then
            XCTAssertEqual(fetchedSchedule?.lightRequirement, lightReq, "Failed for light requirement: \(lightReq)")
        }
    }

    // MARK: - fetchAll() Tests

    func testFetchAll_WhenEmpty_ReturnsEmptyArray() async throws {
        // When
        let schedules = try await sut.fetchAll()

        // Then
        XCTAssertTrue(schedules.isEmpty)
    }

    func testFetchAll_WithMultipleSchedules_ReturnsAllSchedules() async throws {
        // Given
        let schedule1 = createTestSchedule(plantID: UUID())
        let schedule2 = createTestSchedule(plantID: UUID())
        let schedule3 = createTestSchedule(plantID: UUID())

        try await sut.save(schedule1)
        try await sut.save(schedule2)
        try await sut.save(schedule3)

        // When
        let schedules = try await sut.fetchAll()

        // Then
        XCTAssertEqual(schedules.count, 3)
    }

    func testFetchAll_SortsByPlantID() async throws {
        // Given
        let plantID1 = UUID()
        let plantID2 = UUID()
        let plantID3 = UUID()

        try await sut.save(createTestSchedule(plantID: plantID2))
        try await sut.save(createTestSchedule(plantID: plantID1))
        try await sut.save(createTestSchedule(plantID: plantID3))

        // When
        let schedules = try await sut.fetchAll()

        // Then
        XCTAssertEqual(schedules.count, 3)
        // Results should be sorted by plantID (UUID string comparison)
        let plantIDs = schedules.map { $0.plantID }
        XCTAssertEqual(plantIDs, plantIDs.sorted { $0.uuidString < $1.uuidString })
    }

    // MARK: - delete() Tests

    func testDelete_WhenScheduleExists_RemovesSchedule() async throws {
        // Given
        let plantID = UUID()
        let schedule = createTestSchedule(plantID: plantID)
        try await sut.save(schedule)

        // Verify schedule exists
        let fetchedBefore = try await sut.fetch(for: plantID)
        XCTAssertNotNil(fetchedBefore)

        // When
        try await sut.delete(for: plantID)

        // Then
        let fetchedAfter = try await sut.fetch(for: plantID)
        XCTAssertNil(fetchedAfter)
    }

    func testDelete_WhenScheduleDoesNotExist_ThrowsScheduleNotFound() async {
        // Given
        let nonExistentPlantID = UUID()

        // When/Then
        do {
            try await sut.delete(for: nonExistentPlantID)
            XCTFail("Expected scheduleNotFound error to be thrown")
        } catch let error as CareScheduleStorageError {
            switch error {
            case .scheduleNotFound(let id):
                XCTAssertEqual(id, nonExistentPlantID)
            default:
                XCTFail("Expected scheduleNotFound error, got \(error)")
            }
        } catch {
            XCTFail("Expected CareScheduleStorageError, got \(error)")
        }
    }

    func testDelete_AlsoDeletesAssociatedTasks() async throws {
        // Given
        let plantID = UUID()
        let task1 = createTestTask(plantID: plantID, type: .watering)
        let task2 = createTestTask(plantID: plantID, type: .fertilizing)
        let schedule = createTestSchedule(plantID: plantID, tasks: [task1, task2])
        try await sut.save(schedule)

        // Verify tasks exist
        let tasksBefore = try await sut.fetchAllTasks()
        XCTAssertEqual(tasksBefore.count, 2)

        // When
        try await sut.delete(for: plantID)

        // Then - Tasks should also be deleted
        let tasksAfter = try await sut.fetchAllTasks()
        XCTAssertTrue(tasksAfter.isEmpty)
    }

    // MARK: - updateTask() Tests

    func testUpdateTask_WhenTaskExists_UpdatesTask() async throws {
        // Given
        let plantID = UUID()
        let taskID = UUID()
        let originalTask = CareTask(
            id: taskID,
            plantID: plantID,
            type: .watering,
            scheduledDate: Date(),
            completedDate: nil,
            notes: "Original notes"
        )
        let schedule = createTestSchedule(plantID: plantID, tasks: [originalTask])
        try await sut.save(schedule)

        // When
        let updatedTask = CareTask(
            id: taskID,
            plantID: plantID,
            type: .watering,
            scheduledDate: Date().addingTimeInterval(86400), // Tomorrow
            completedDate: Date(),
            notes: "Updated notes"
        )
        try await sut.updateTask(updatedTask)

        // Then
        let allTasks = try await sut.fetchAllTasks()
        let fetchedTask = allTasks.first { $0.id == taskID }
        XCTAssertNotNil(fetchedTask)
        XCTAssertEqual(fetchedTask?.notes, "Updated notes")
        XCTAssertNotNil(fetchedTask?.completedDate)
    }

    func testUpdateTask_WhenTaskDoesNotExist_ThrowsTaskNotFound() async {
        // Given
        let nonExistentTaskID = UUID()
        let task = createTestTask(id: nonExistentTaskID)

        // When/Then
        do {
            try await sut.updateTask(task)
            XCTFail("Expected taskNotFound error to be thrown")
        } catch let error as CareScheduleStorageError {
            switch error {
            case .taskNotFound(let id):
                XCTAssertEqual(id, nonExistentTaskID)
            default:
                XCTFail("Expected taskNotFound error, got \(error)")
            }
        } catch {
            XCTFail("Expected CareScheduleStorageError, got \(error)")
        }
    }

    func testUpdateTask_UpdatesTaskType() async throws {
        // Given
        let plantID = UUID()
        let taskID = UUID()
        let task = CareTask(
            id: taskID,
            plantID: plantID,
            type: .watering,
            scheduledDate: Date(),
            notes: ""
        )
        let schedule = createTestSchedule(plantID: plantID, tasks: [task])
        try await sut.save(schedule)

        // When
        let updatedTask = CareTask(
            id: taskID,
            plantID: plantID,
            type: .fertilizing,
            scheduledDate: Date(),
            notes: ""
        )
        try await sut.updateTask(updatedTask)

        // Then
        let allTasks = try await sut.fetchAllTasks()
        let fetchedTask = allTasks.first { $0.id == taskID }
        XCTAssertEqual(fetchedTask?.type, .fertilizing)
    }

    // MARK: - fetchUpcomingTasks() Tests

    func testFetchUpcomingTasks_ReturnsTasksWithinSpecifiedDays() async throws {
        // Given
        let plantID = UUID()
        let now = Date()

        // Task scheduled tomorrow (should be included)
        let tomorrowTask = CareTask(
            id: UUID(),
            plantID: plantID,
            type: .watering,
            scheduledDate: Calendar.current.date(byAdding: .day, value: 1, to: now)!,
            notes: "Tomorrow task"
        )

        // Task scheduled in 3 days (should be included for 7 days)
        let threeDaysTask = CareTask(
            id: UUID(),
            plantID: plantID,
            type: .fertilizing,
            scheduledDate: Calendar.current.date(byAdding: .day, value: 3, to: now)!,
            notes: "Three days task"
        )

        // Task scheduled in 10 days (should NOT be included for 7 days)
        let tenDaysTask = CareTask(
            id: UUID(),
            plantID: plantID,
            type: .pruning,
            scheduledDate: Calendar.current.date(byAdding: .day, value: 10, to: now)!,
            notes: "Ten days task"
        )

        // Task in the past (should NOT be included)
        let pastTask = CareTask(
            id: UUID(),
            plantID: plantID,
            type: .repotting,
            scheduledDate: Calendar.current.date(byAdding: .day, value: -1, to: now)!,
            notes: "Past task"
        )

        // Completed task (should NOT be included)
        let completedTask = CareTask(
            id: UUID(),
            plantID: plantID,
            type: .watering,
            scheduledDate: Calendar.current.date(byAdding: .day, value: 2, to: now)!,
            completedDate: now,
            notes: "Completed task"
        )

        let schedule = createTestSchedule(
            plantID: plantID,
            tasks: [tomorrowTask, threeDaysTask, tenDaysTask, pastTask, completedTask]
        )
        try await sut.save(schedule)

        // When
        let upcomingTasks = try await sut.fetchUpcomingTasks(days: 7)

        // Then
        XCTAssertEqual(upcomingTasks.count, 2)
        let notes = upcomingTasks.map { $0.notes }
        XCTAssertTrue(notes.contains("Tomorrow task"))
        XCTAssertTrue(notes.contains("Three days task"))
        XCTAssertFalse(notes.contains("Ten days task"))
        XCTAssertFalse(notes.contains("Past task"))
        XCTAssertFalse(notes.contains("Completed task"))
    }

    func testFetchUpcomingTasks_ReturnsTasksSortedByScheduledDate() async throws {
        // Given
        let plantID = UUID()
        let now = Date()

        let task3Days = createTestTask(
            plantID: plantID,
            scheduledDate: Calendar.current.date(byAdding: .day, value: 3, to: now)!,
            notes: "3 days"
        )
        let task1Day = createTestTask(
            plantID: plantID,
            scheduledDate: Calendar.current.date(byAdding: .day, value: 1, to: now)!,
            notes: "1 day"
        )
        let task2Days = createTestTask(
            plantID: plantID,
            scheduledDate: Calendar.current.date(byAdding: .day, value: 2, to: now)!,
            notes: "2 days"
        )

        let schedule = createTestSchedule(plantID: plantID, tasks: [task3Days, task1Day, task2Days])
        try await sut.save(schedule)

        // When
        let upcomingTasks = try await sut.fetchUpcomingTasks(days: 7)

        // Then
        XCTAssertEqual(upcomingTasks.count, 3)
        XCTAssertEqual(upcomingTasks[0].notes, "1 day")
        XCTAssertEqual(upcomingTasks[1].notes, "2 days")
        XCTAssertEqual(upcomingTasks[2].notes, "3 days")
    }

    func testFetchUpcomingTasks_WhenNoTasks_ReturnsEmptyArray() async throws {
        // When
        let upcomingTasks = try await sut.fetchUpcomingTasks(days: 7)

        // Then
        XCTAssertTrue(upcomingTasks.isEmpty)
    }

    func testFetchUpcomingTasks_WithZeroDays_ReturnsNoTasks() async throws {
        // Given
        let plantID = UUID()
        let task = createTestTask(
            plantID: plantID,
            scheduledDate: Date().addingTimeInterval(3600) // 1 hour from now
        )
        let schedule = createTestSchedule(plantID: plantID, tasks: [task])
        try await sut.save(schedule)

        // When
        let upcomingTasks = try await sut.fetchUpcomingTasks(days: 0)

        // Then
        XCTAssertTrue(upcomingTasks.isEmpty)
    }

    // MARK: - fetchAllTasks() Tests

    func testFetchAllTasks_ReturnsAllTasks() async throws {
        // Given
        let plantID1 = UUID()
        let plantID2 = UUID()

        let schedule1 = createTestSchedule(
            plantID: plantID1,
            tasks: [createTestTask(plantID: plantID1), createTestTask(plantID: plantID1)]
        )
        let schedule2 = createTestSchedule(
            plantID: plantID2,
            tasks: [createTestTask(plantID: plantID2)]
        )

        try await sut.save(schedule1)
        try await sut.save(schedule2)

        // When
        let allTasks = try await sut.fetchAllTasks()

        // Then
        XCTAssertEqual(allTasks.count, 3)
    }

    // MARK: - exists() Tests

    func testExists_WhenScheduleExists_ReturnsTrue() async throws {
        // Given
        let plantID = UUID()
        let schedule = createTestSchedule(plantID: plantID)
        try await sut.save(schedule)

        // When
        let exists = try await sut.exists(for: plantID)

        // Then
        XCTAssertTrue(exists)
    }

    func testExists_WhenScheduleDoesNotExist_ReturnsFalse() async throws {
        // Given
        let nonExistentPlantID = UUID()

        // When
        let exists = try await sut.exists(for: nonExistentPlantID)

        // Then
        XCTAssertFalse(exists)
    }

    // MARK: - markTaskCompleted() Tests

    func testMarkTaskCompleted_SetsCompletedDate() async throws {
        // Given
        let plantID = UUID()
        let taskID = UUID()
        let task = CareTask(
            id: taskID,
            plantID: plantID,
            type: .watering,
            scheduledDate: Date(),
            completedDate: nil,
            notes: ""
        )
        let schedule = createTestSchedule(plantID: plantID, tasks: [task])
        try await sut.save(schedule)

        // When
        try await sut.markTaskCompleted(taskID: taskID)

        // Then
        let allTasks = try await sut.fetchAllTasks()
        let completedTask = allTasks.first { $0.id == taskID }
        XCTAssertNotNil(completedTask?.completedDate)
    }

    func testMarkTaskCompleted_WhenTaskDoesNotExist_ThrowsTaskNotFound() async {
        // Given
        let nonExistentTaskID = UUID()

        // When/Then
        do {
            try await sut.markTaskCompleted(taskID: nonExistentTaskID)
            XCTFail("Expected taskNotFound error to be thrown")
        } catch let error as CareScheduleStorageError {
            switch error {
            case .taskNotFound(let id):
                XCTAssertEqual(id, nonExistentTaskID)
            default:
                XCTFail("Expected taskNotFound error, got \(error)")
            }
        } catch {
            XCTFail("Expected CareScheduleStorageError, got \(error)")
        }
    }

    // MARK: - fetchOverdueTasks() Tests

    func testFetchOverdueTasks_ReturnsOverdueIncompleteTasks() async throws {
        // Given
        let plantID = UUID()
        let now = Date()

        // Overdue task (past date, not completed)
        let overdueTask = createTestTask(
            plantID: plantID,
            type: .watering,
            scheduledDate: Calendar.current.date(byAdding: .day, value: -2, to: now)!,
            completedDate: nil,
            notes: "Overdue"
        )

        // Past but completed (should NOT be included)
        let completedPastTask = createTestTask(
            plantID: plantID,
            type: .fertilizing,
            scheduledDate: Calendar.current.date(byAdding: .day, value: -1, to: now)!,
            completedDate: now,
            notes: "Completed past"
        )

        // Future task (should NOT be included)
        let futureTask = createTestTask(
            plantID: plantID,
            type: .pruning,
            scheduledDate: Calendar.current.date(byAdding: .day, value: 1, to: now)!,
            notes: "Future"
        )

        let schedule = createTestSchedule(
            plantID: plantID,
            tasks: [overdueTask, completedPastTask, futureTask]
        )
        try await sut.save(schedule)

        // When
        let overdueTasks = try await sut.fetchOverdueTasks()

        // Then
        XCTAssertEqual(overdueTasks.count, 1)
        XCTAssertEqual(overdueTasks.first?.notes, "Overdue")
    }

    // MARK: - fetchTasks(for:) Tests

    func testFetchTasksForPlant_ReturnsOnlyTasksForSpecifiedPlant() async throws {
        // Given
        let plantID1 = UUID()
        let plantID2 = UUID()

        let schedule1 = createTestSchedule(
            plantID: plantID1,
            tasks: [
                createTestTask(plantID: plantID1, notes: "Plant 1 Task 1"),
                createTestTask(plantID: plantID1, notes: "Plant 1 Task 2")
            ]
        )
        let schedule2 = createTestSchedule(
            plantID: plantID2,
            tasks: [createTestTask(plantID: plantID2, notes: "Plant 2 Task")]
        )

        try await sut.save(schedule1)
        try await sut.save(schedule2)

        // When
        let tasksForPlant1 = try await sut.fetchTasks(for: plantID1)

        // Then
        XCTAssertEqual(tasksForPlant1.count, 2)
        XCTAssertTrue(tasksForPlant1.allSatisfy { $0.plantID == plantID1 })
    }

    // MARK: - getTaskStatistics() Tests

    func testGetTaskStatistics_ReturnsCorrectCounts() async throws {
        // Given
        let plantID = UUID()
        let now = Date()

        let tasks = [
            // Upcoming (within 7 days)
            createTestTask(
                plantID: plantID,
                scheduledDate: Calendar.current.date(byAdding: .day, value: 2, to: now)!
            ),
            createTestTask(
                plantID: plantID,
                scheduledDate: Calendar.current.date(byAdding: .day, value: 5, to: now)!
            ),
            // Overdue
            createTestTask(
                plantID: plantID,
                scheduledDate: Calendar.current.date(byAdding: .day, value: -1, to: now)!
            ),
            createTestTask(
                plantID: plantID,
                scheduledDate: Calendar.current.date(byAdding: .day, value: -3, to: now)!
            ),
            createTestTask(
                plantID: plantID,
                scheduledDate: Calendar.current.date(byAdding: .day, value: -5, to: now)!
            )
        ]

        let schedule = createTestSchedule(plantID: plantID, tasks: tasks)
        try await sut.save(schedule)

        // When
        let stats = try await sut.getTaskStatistics()

        // Then
        XCTAssertEqual(stats.upcoming, 2)
        XCTAssertEqual(stats.overdue, 3)
    }

    // MARK: - Error Description Tests

    func testCareScheduleStorageError_HasCorrectDescriptions() {
        // Test scheduleNotFound
        let scheduleNotFoundError = CareScheduleStorageError.scheduleNotFound(UUID())
        XCTAssertNotNil(scheduleNotFoundError.errorDescription)
        XCTAssertTrue(scheduleNotFoundError.errorDescription?.contains("not found") ?? false)

        // Test taskNotFound
        let taskNotFoundError = CareScheduleStorageError.taskNotFound(UUID())
        XCTAssertNotNil(taskNotFoundError.errorDescription)
        XCTAssertTrue(taskNotFoundError.errorDescription?.contains("not found") ?? false)

        // Test saveFailed
        let saveFailed = CareScheduleStorageError.saveFailed(NSError(domain: "test", code: 1))
        XCTAssertNotNil(saveFailed.errorDescription)

        // Test fetchFailed
        let fetchFailed = CareScheduleStorageError.fetchFailed(NSError(domain: "test", code: 1))
        XCTAssertNotNil(fetchFailed.errorDescription)

        // Test deleteFailed
        let deleteFailed = CareScheduleStorageError.deleteFailed(NSError(domain: "test", code: 1))
        XCTAssertNotNil(deleteFailed.errorDescription)

        // Test updateFailed
        let updateFailed = CareScheduleStorageError.updateFailed(NSError(domain: "test", code: 1))
        XCTAssertNotNil(updateFailed.errorDescription)

        // Test invalidData
        let invalidData = CareScheduleStorageError.invalidData("Test message")
        XCTAssertNotNil(invalidData.errorDescription)
        XCTAssertTrue(invalidData.errorDescription?.contains("Test message") ?? false)

        // Test entityNotFound
        let entityNotFound = CareScheduleStorageError.entityNotFound("TestEntity")
        XCTAssertNotNil(entityNotFound.errorDescription)
        XCTAssertTrue(entityNotFound.errorDescription?.contains("TestEntity") ?? false)
    }

    // MARK: - Protocol Conformance Tests

    func testCoreDataCareScheduleStorage_ConformsToProtocol() {
        // Then
        XCTAssertTrue(sut is CareScheduleRepositoryProtocol)
    }

    // MARK: - Edge Cases

    func testSaveAndFetch_WithEmptyTasks_WorksCorrectly() async throws {
        // Given
        let plantID = UUID()
        let schedule = createTestSchedule(plantID: plantID, tasks: [])

        // When
        try await sut.save(schedule)
        let fetchedSchedule = try await sut.fetch(for: plantID)

        // Then
        XCTAssertNotNil(fetchedSchedule)
        XCTAssertTrue(fetchedSchedule?.tasks.isEmpty ?? false)
    }

    func testSaveAndFetch_WithAllTaskTypes_WorksCorrectly() async throws {
        // Given
        let plantID = UUID()
        let tasks = CareTaskType.allCases.map { type in
            createTestTask(plantID: plantID, type: type)
        }
        let schedule = createTestSchedule(plantID: plantID, tasks: tasks)

        // When
        try await sut.save(schedule)
        let fetchedSchedule = try await sut.fetch(for: plantID)

        // Then
        XCTAssertEqual(fetchedSchedule?.tasks.count, CareTaskType.allCases.count)
        for type in CareTaskType.allCases {
            XCTAssertTrue(fetchedSchedule?.tasks.contains { $0.type == type } ?? false)
        }
    }

    func testConcurrentSaves_DoNotCorruptData() async throws {
        // Given
        let iterations = 10

        // When
        await withTaskGroup(of: Void.self) { group in
            for i in 0..<iterations {
                group.addTask { [sut] in
                    let schedule = self.createTestSchedule(
                        plantID: UUID(),
                        wateringSchedule: "Schedule \(i)"
                    )
                    try? await sut!.save(schedule)
                }
            }
        }

        // Then
        let allSchedules = try await sut.fetchAll()
        XCTAssertEqual(allSchedules.count, iterations)
    }
}