/*
Copyright 2019-2024 New Vector Ltd.
Copyright (c) 2021 BWI GmbH

SPDX-License-Identifier: AGPL-3.0-only
Please see LICENSE in the repository root for full details.
 */

import Foundation

import MatrixSDK

@objc enum WidgetPermission: Int {
    case undefined
    case granted
    case declined
}

/// Shared user settings across all Riot clients.
/// It implements https://github.com/vector-im/riot-meta/blob/master/spec/settings.md
@objcMembers
class RiotSharedSettings: NSObject {

    // MARK: - Constants
    private enum Settings {
        static let breadcrumbs = "im.vector.setting.breadcrumbs"
        static let integrationProvisioning = "im.vector.setting.integration_provisioning"
        static let allowedWidgets = "im.vector.setting.allowed_widgets"
    }


    // MARK: - Properties
    // MARK: Private
    private let session: MXSession
    private lazy var serializationService: SerializationServiceType = SerializationService()


    // MARK: - Setup

    init(session: MXSession) {
        self.session = session
    }


    // MARK: - Public

    // MARK: Integration provisioning

    var hasIntegrationProvisioningEnabled: Bool {
        return getIntegrationProvisioning()?.enabled ?? true
    }

    func getIntegrationProvisioning() -> RiotSettingIntegrationProvisioning? {
        guard let integrationProvisioningDict = getAccountData(forEventType: Settings.integrationProvisioning) else {
            return nil
        }

        return try? serializationService.deserialize(integrationProvisioningDict)
    }

    @discardableResult
    func setIntegrationProvisioning(enabled: Bool,
                                    success: @escaping () -> Void,
                                    failure: @escaping (Error?) -> Void)
        -> MXHTTPOperation? {

        // Update only the "widgets" field in the account data
        var integrationProvisioningDict = getAccountData(forEventType: Settings.integrationProvisioning) ?? [:]
        integrationProvisioningDict[RiotSettingIntegrationProvisioning.CodingKeys.enabled.rawValue] = enabled

        return session.setAccountData(integrationProvisioningDict, forType: Settings.integrationProvisioning, success: success, failure: failure)
    }


    // MARK: Allowed widgets
    func permission(for widget: Widget) -> WidgetPermission {
        guard let allowedWidgets = getAllowedWidgets() else {
            return .undefined
        }

        if let value = allowedWidgets.widgets[widget.widgetEvent.eventId] {
            return value == true ? .granted : .declined
        } else {
            return .undefined
        }
    }

    func getAllowedWidgets() -> RiotSettingAllowedWidgets? {
        guard let allowedWidgetsDict = getAccountData(forEventType: Settings.allowedWidgets) else {
            return nil
        }

        return try? serializationService.deserialize(allowedWidgetsDict)
    }

    @discardableResult
    func setPermission(_ permission: WidgetPermission,
                                          for widget: Widget,
                                          success: @escaping () -> Void,
                                          failure: @escaping (Error?) -> Void)
        -> MXHTTPOperation? {

        guard let widgetEventId = widget.widgetEvent.eventId else {
            return nil
        }

        var widgets = getAllowedWidgets()?.widgets ?? [:]

        switch permission {
        case .undefined:
            widgets.removeValue(forKey: widgetEventId)
        case .granted:
            widgets[widgetEventId] = true
        case .declined:
            widgets[widgetEventId] = false
        }

        // Update only the "widgets" field in the account data
        var allowedWidgetsDict = getAccountData(forEventType: Settings.allowedWidgets) ?? [:]
        allowedWidgetsDict[RiotSettingAllowedWidgets.CodingKeys.widgets.rawValue] = widgets

        return session.setAccountData(allowedWidgetsDict, forType: Settings.allowedWidgets, success: success, failure: failure)
    }


    // MARK: Allowed native widgets

    /// Get the permission for widget that will be displayed natively instead within
    /// a webview.
    ///
    /// - Parameters:
    ///   - widget: the widget
    ///   - url: the url the native implementation will open. Nil will use the url declared in the widget
    /// - Returns: the permission
    func permission(forNative widget: Widget, fromUrl url: URL? = nil) -> WidgetPermission {
        guard let allowedWidgets = getAllowedWidgets() else {
            return .undefined
        }

        guard let type = widget.type, let domain = domainForNativeWidget(widget, fromUrl: url) else {
            return .undefined
        }

        if let value = allowedWidgets.nativeWidgets[type]?[domain] {
            return value == true ? .granted : .declined
        } else {
            return .undefined
        }
    }

    /// Set the permission for widget that is displayed natively.
    ///
    /// - Parameters:
    ///   - permission: the permission to set
    ///   - widget: the widget
    ///   - url: the url the native implementation opens. Nil will use the url declared in the widget
    ///   - success: the success block
    ///   - failure: the failure block
    /// - Returns: a `MXHTTPOperation` instance.
    @discardableResult
    func setPermission(_ permission: WidgetPermission,
                       forNative widget: Widget,
                       fromUrl url: URL?,
                       success: @escaping () -> Void,
                       failure: @escaping (Error?) -> Void)
        -> MXHTTPOperation? {

        guard let type = widget.type, let domain = domainForNativeWidget(widget, fromUrl: url) else {
            return nil
        }

        var nativeWidgets = getAllowedWidgets()?.nativeWidgets ?? [String: [String: Bool]]()
        var nativeWidgetsType = nativeWidgets[type] ?? [String: Bool]()

        switch permission {
        case .undefined:
            nativeWidgetsType.removeValue(forKey: domain)
        case .granted:
            nativeWidgetsType[domain] = true
        case .declined:
            nativeWidgetsType[domain] = false
        }

        nativeWidgets[type] = nativeWidgetsType

        // Update only the "native_widgets" field in the account data
        var allowedWidgetsDict = getAccountData(forEventType: Settings.allowedWidgets) ?? [:]
        allowedWidgetsDict[RiotSettingAllowedWidgets.CodingKeys.nativeWidgets.rawValue] = nativeWidgets

        return session.setAccountData(allowedWidgetsDict, forType: Settings.allowedWidgets, success: success, failure: failure)
    }

    // MARK: Notification Times
    
    func fetchNotificationTimes() {
        guard let dict = getAccountData(forEventType: "de.bwi.notification_times") else {
            return
        }
        
        NotificationTimes.shared.isEnabled = (dict["is_enabled"] as? Bool) ?? false
        
        if let entries = dict["entries"] as? [[String: Any]], entries.count == 7 {
            for i in 0...6 {
                let weekday = NotificationTimes.shared.weekday(index: i)
                weekday.isEnabled = (entries[i]["is_enabled"] as? Bool) ?? false
                if let fromHour = entries[i]["from_hour"] as? Int, let fromMinute = entries[i]["from_minute"] as? Int {
                    weekday.startTime = Date.from(hour: fromHour, minute: fromMinute)
                }
                if let toHour = entries[i]["to_hour"] as? Int, let toMinute = entries[i]["to_minute"] as? Int {
                    weekday.endTime = Date.from(hour: toHour, minute: toMinute)
                }
            }
        }
        if let rooms = dict["rooms"] as? [[String: Any]] {
            NotificationTimes.shared.rooms = [:]
            
            for room in rooms {
                if let roomID = room["room_id"] as? String, let isEnabled = room["is_enabled"] as? Bool {
                    NotificationTimes.shared.rooms[roomID] = isEnabled
                }
            }
        }
    }

    func storeNotificationTimes(success: @escaping () -> Void, failure: @escaping (Error?) -> Void) -> MXHTTPOperation? {
        let eventType = "de.bwi.notification_times"
        var entries: [[String: Any]] = []
        for i in 0...6 {
            let weekday = NotificationTimes.shared.weekday(index: i)
            let calender = Calendar.current
            let fromHour = calender.component(.hour, from: weekday.startTime)
            let fromMinute = calender.component(.minute, from: weekday.startTime)
            let toHour = calender.component(.hour, from: weekday.endTime)
            let toMinute = calender.component(.minute, from: weekday.endTime)
            
            let entry: [String: Any] = ["is_enabled": weekday.isEnabled, "from_hour": fromHour, "from_minute": fromMinute, "to_hour": toHour, "to_minute": toMinute]
            entries.append(entry)
        }
        
        var rooms: [[String: Any]] = []
        for room in NotificationTimes.shared.rooms {
            rooms.append(["room_id": room.key, "is_enabled": room.value])
        }

        let dict: [String: Any] = ["is_enabled": NotificationTimes.shared.isEnabled, "entries": entries, "rooms": rooms]
        return session.setAccountData(dict, forType: eventType, success: success, failure: failure)
    }

    // MARK: Top Banner Features

    func topBanner(for feature: String) -> Bool {
        guard let featuresDict = getAccountData(forEventType: "de.bwi.top_banner_features") else {
            return true
        }
        return (featuresDict[feature] as? Bool) ?? true
    }

    @discardableResult
    func setTopBannerFeature(_ feature: String,
                                 enabled: Bool,
                                 success: @escaping () -> Void,
                                 failure: @escaping (Error?) -> Void) -> MXHTTPOperation? {
            
        let eventType = "de.bwi.top_banner_features"
        var featuresDict = getAccountData(forEventType: eventType) ?? [:]
        featuresDict[feature] = enabled

        return session.setAccountData(featuresDict, forType: eventType, success: success, failure: failure)
    }

    // MARK: Top Banner Features
    
    func happyBirthdayCampaign(for campaign: String) -> Bool {
        guard let notificationsDict = getAccountData(forEventType: "de.bwi.notifications") else {
            return true
        }
        guard let birthdayCampaignDict = notificationsDict["should_show_ios_birthday_campaign"] as? [String : Any] else {
            return true
        }
        return (birthdayCampaignDict["2022"] as? Bool) ?? true
    }

    @discardableResult
    func setHappyBirthdayCampaign(_ campaign: String,
                                  enabled: Bool,
                                  success: @escaping () -> Void,
                                  failure: @escaping (Error?) -> Void) -> MXHTTPOperation? {
        
        var notificationsDict = getAccountData(forEventType: "de.bwi.notifications") ?? [:]
        var birthdayCampaignDict = notificationsDict["should_show_ios_birthday_campaign"] as? [String : Any] ?? [String: Any]()
        birthdayCampaignDict[campaign] = enabled
        notificationsDict["should_show_ios_birthday_campaign"] = birthdayCampaignDict

        return session.setAccountData(notificationsDict, forType: "de.bwi.notifications", success: success, failure: failure)
    }
    
    // MARK: - Private
    private func getAccountData(forEventType eventType: String) -> [String: Any]? {
        return session.accountData.accountData(forEventType: eventType) as? [String: Any]
    }

    private func domainForNativeWidget(_ widget: Widget, fromUrl url: URL? = nil) -> String? {
        var widgetUrl: URL?
        if let widgetUrlString = widget.url {
            widgetUrl = URL(string: widgetUrlString)
        }

        guard let url = url ?? widgetUrl, let domain = url.host else {
            return nil
        }

        return domain
    }
}