//
//  MockNotificationService.swift
//  PlantGuideTests
//
//  Mock implementation of NotificationServiceProtocol for unit testing.
//  Provides configurable behavior and call tracking for verification.
//

import Foundation
import UserNotifications
@testable import PlantGuide

// MARK: - MockNotificationService

/// Mock implementation of NotificationServiceProtocol for testing
final actor MockNotificationService: NotificationServiceProtocol {

    // MARK: - Storage

    private var scheduledReminders: [UUID: (task: CareTask, plantName: String, plantID: UUID)] = [:]
    private var pendingNotifications: [UNNotificationRequest] = []

    // MARK: - Call Tracking

    private(set) var requestAuthorizationCallCount = 0
    private(set) var scheduleReminderCallCount = 0
    private(set) var cancelReminderCallCount = 0
    private(set) var cancelAllRemindersCallCount = 0
    private(set) var cancelRemindersForTypeCallCount = 0
    private(set) var updateBadgeCountCallCount = 0
    private(set) var getPendingNotificationsCallCount = 0
    private(set) var removeAllDeliveredNotificationsCallCount = 0

    // MARK: - Error Configuration

    var shouldThrowOnRequestAuthorization = false
    var shouldThrowOnScheduleReminder = false

    var errorToThrow: Error = NotificationError.schedulingFailed(
        NSError(domain: "MockError", code: -1, userInfo: [NSLocalizedDescriptionKey: "Mock notification error"])
    )

    // MARK: - Return Value Configuration

    var authorizationGranted = true

    // MARK: - Captured Values

    private(set) var lastScheduledTask: CareTask?
    private(set) var lastScheduledPlantName: String?
    private(set) var lastScheduledPlantID: UUID?
    private(set) var lastCancelledTaskID: UUID?
    private(set) var lastCancelledAllPlantID: UUID?
    private(set) var lastCancelledTaskType: CareTaskType?
    private(set) var lastCancelledTaskTypePlantID: UUID?
    private(set) var lastBadgeCount: Int?

    // MARK: - NotificationServiceProtocol

    func requestAuthorization() async throws -> Bool {
        requestAuthorizationCallCount += 1
        if shouldThrowOnRequestAuthorization {
            throw errorToThrow
        }
        if !authorizationGranted {
            throw NotificationError.permissionDenied
        }
        return authorizationGranted
    }

    func scheduleReminder(for task: CareTask, plantName: String, plantID: UUID) async throws {
        scheduleReminderCallCount += 1
        lastScheduledTask = task
        lastScheduledPlantName = plantName
        lastScheduledPlantID = plantID

        if shouldThrowOnScheduleReminder {
            throw errorToThrow
        }

        // Validate that the scheduled date is in the future
        guard task.scheduledDate > Date() else {
            throw NotificationError.invalidTriggerDate
        }

        scheduledReminders[task.id] = (task, plantName, plantID)
    }

    func cancelReminder(for taskID: UUID) async {
        cancelReminderCallCount += 1
        lastCancelledTaskID = taskID
        scheduledReminders.removeValue(forKey: taskID)
    }

    func cancelAllReminders(for plantID: UUID) async {
        cancelAllRemindersCallCount += 1
        lastCancelledAllPlantID = plantID

        // Remove all reminders for this plant
        let keysToRemove = scheduledReminders.filter { $0.value.plantID == plantID }.map { $0.key }
        for key in keysToRemove {
            scheduledReminders.removeValue(forKey: key)
        }
    }

    func cancelReminders(for taskType: CareTaskType, plantID: UUID) async {
        cancelRemindersForTypeCallCount += 1
        lastCancelledTaskType = taskType
        lastCancelledTaskTypePlantID = plantID

        // Remove all reminders matching this task type and plant
        let keysToRemove = scheduledReminders.filter {
            $0.value.plantID == plantID && $0.value.task.type == taskType
        }.map { $0.key }
        for key in keysToRemove {
            scheduledReminders.removeValue(forKey: key)
        }
    }

    func updateBadgeCount(_ count: Int) async {
        updateBadgeCountCallCount += 1
        lastBadgeCount = count
    }

    func getPendingNotifications() async -> [UNNotificationRequest] {
        getPendingNotificationsCallCount += 1
        return pendingNotifications
    }

    func removeAllDeliveredNotifications() async {
        removeAllDeliveredNotificationsCallCount += 1
    }

    // MARK: - Helper Methods

    /// Resets all state for clean test setup
    func reset() {
        scheduledReminders = [:]
        pendingNotifications = []

        requestAuthorizationCallCount = 0
        scheduleReminderCallCount = 0
        cancelReminderCallCount = 0
        cancelAllRemindersCallCount = 0
        cancelRemindersForTypeCallCount = 0
        updateBadgeCountCallCount = 0
        getPendingNotificationsCallCount = 0
        removeAllDeliveredNotificationsCallCount = 0

        shouldThrowOnRequestAuthorization = false
        shouldThrowOnScheduleReminder = false

        authorizationGranted = true

        lastScheduledTask = nil
        lastScheduledPlantName = nil
        lastScheduledPlantID = nil
        lastCancelledTaskID = nil
        lastCancelledAllPlantID = nil
        lastCancelledTaskType = nil
        lastCancelledTaskTypePlantID = nil
        lastBadgeCount = nil
    }

    /// Gets the count of scheduled reminders
    var scheduledReminderCount: Int {
        scheduledReminders.count
    }

    /// Gets scheduled reminders for a specific plant
    func reminders(for plantID: UUID) -> [CareTask] {
        scheduledReminders.values
            .filter { $0.plantID == plantID }
            .map { $0.task }
    }

    /// Checks if a reminder is scheduled for a task
    func hasReminder(for taskID: UUID) -> Bool {
        scheduledReminders[taskID] != nil
    }

    /// Gets all scheduled task IDs
    var scheduledTaskIDs: [UUID] {
        Array(scheduledReminders.keys)
    }

    /// Adds a pending notification for testing getPendingNotifications
    func addPendingNotification(_ request: UNNotificationRequest) {
        pendingNotifications.append(request)
    }
}