//
//  MockSupport.swift
//  MockKitUI
//
//  Created by Rick Pasetto on 10/13/21.
//  Copyright © 2021 LoopKit Authors. All rights reserved.
//

import Foundation
import LoopKit
import LoopKitUI
import SwiftUI

public class MockSupport: SupportUI {
    public static let supportIdentifier = "MockSupport"
    
    var versionUpdate: VersionUpdate?
    var alertIssuer: AlertIssuer? {
        return self.delegate
    }
    var lastVersionCheckAlertDate: Date?

    public init() { }

    public required init?(rawState: RawStateValue) {
        lastVersionCheckAlertDate = rawState["lastVersionCheckAlertDate"] as? Date
    }
    
    public var rawState: RawStateValue {
        var rawValue: RawStateValue = [:]
        rawValue["lastVersionCheckAlertDate"] = lastVersionCheckAlertDate
        return rawValue
    }
   
    public func checkVersion(bundleIdentifier: String, currentVersion: String, completion: @escaping (Result<VersionUpdate?, Error>) -> Void) {
        maybeIssueAlert(versionUpdate ?? .none)
        completion(.success(versionUpdate))
    }
    
    public weak var delegate: SupportUIDelegate?
    
    public func supportMenuItem(supportInfoProvider: SupportInfoProvider, urlHandler: @escaping (URL) -> Void) -> AnyView? {
        return AnyView(SupportMenuItem(mockSupport: self))
    }
    
    public func softwareUpdateView(bundleIdentifier: String, currentVersion: String, guidanceColors: GuidanceColors, openAppStore: (() -> Void)?) -> AnyView? {
        return AnyView(
            Button("versionUpdate: \(versionUpdate!.localizedDescription)\n\nbundleIdentifier: \(bundleIdentifier)\n\ncurrentVersion: \(currentVersion)") {
                openAppStore?()
            }
        )
    }
}

extension MockSupport {
    
    var alertCadence: TimeInterval {
        return TimeInterval.minutes(1)
    }
    
    private var appName: String {
        return Bundle.main.object(forInfoDictionaryKey: "CFBundleDisplayName") as! String
    }

    private func maybeIssueAlert(_ versionUpdate: VersionUpdate) {
        guard versionUpdate >= .recommended else {
            noAlertNecessary()
            return
        }
        
        let alertIdentifier = Alert.Identifier(managerIdentifier: MockSupport.supportIdentifier, alertIdentifier: versionUpdate.rawValue)
        let alertContent: LoopKit.Alert.Content
        if firstAlert {
            alertContent = Alert.Content(title: versionUpdate.localizedDescription,
                                         body: NSLocalizedString("""
                                                    Your \(appName) app is out of date. It will continue to work, but we recommend updating to the latest version.
                                                    
                                                    Go to \(appName) Settings > Software Update to complete.
                                                    """, comment: "Alert content body for first software update alert"),
                                         acknowledgeActionButtonLabel: NSLocalizedString("OK", comment: "Default acknowledgement"))
        } else if let lastVersionCheckAlertDate = lastVersionCheckAlertDate,
                  abs(lastVersionCheckAlertDate.timeIntervalSinceNow) > alertCadence {
            alertContent = Alert.Content(title: NSLocalizedString("Update Reminder", comment: "Recurring software update alert title"),
                                         body: NSLocalizedString("""
                                                    A software update is recommended to continue using the \(appName) app.
                                                    
                                                    Go to \(appName) Settings > Software Update to install the latest version.
                                                    """, comment: "Alert content body for recurring software update alert"),
                                         acknowledgeActionButtonLabel: NSLocalizedString("OK", comment: "Default acknowledgement"))
        } else {
            return
        }
        let interruptionLevel: LoopKit.Alert.InterruptionLevel = versionUpdate == .required ? .critical : .active
        alertIssuer?.issueAlert(Alert(identifier: alertIdentifier, foregroundContent: alertContent, backgroundContent: alertContent, trigger: .immediate, interruptionLevel: interruptionLevel))
        recordLastAlertDate()
    }
    
    private func noAlertNecessary() {
        lastVersionCheckAlertDate = nil
    }
    
    private var firstAlert: Bool {
        return lastVersionCheckAlertDate == nil
    }
    
    private func recordLastAlertDate() {
        lastVersionCheckAlertDate = Date()
    }
    
}

struct SupportMenuItem : View {
    
    let mockSupport: MockSupport
    
    @State var showActionSheet: Bool = false
    
    private var buttons: [ActionSheet.Button] {
        VersionUpdate.allCases.map { versionUpdate in
            let setter = { mockSupport.versionUpdate = versionUpdate }
            switch versionUpdate {
            case .required:
                return ActionSheet.Button.destructive(Text(versionUpdate.localizedDescription), action: setter)
            default:
                return ActionSheet.Button.default(Text(versionUpdate.localizedDescription), action: setter)
            }
        } +
        [.cancel(Text("Cancel"))]
    }

    private var actionSheet: ActionSheet {
        ActionSheet(title: Text("Version Check Response"), message: Text("How should the simulator respond to a version check?"), buttons: buttons)
    }

    var body: some View {
        Button(action: {
            self.showActionSheet.toggle()
        }) {
            Text("Mock Version Check \(currentVersionUpdate)")
        }
        .actionSheet(isPresented: $showActionSheet, content: {
            self.actionSheet
        })
        
        Button(action: { mockSupport.lastVersionCheckAlertDate = nil } ) {
            Text("Clear Last Version Check Alert Date")
        }
    }
    
    var currentVersionUpdate: String {
        return mockSupport.versionUpdate.map { "(\($0.rawValue))" } ?? ""
    }
}