//
//  SettingsViewController.swift
//  LoopFollow
//
//  Created by Jon Fawcett on 6/3/20.
//  Copyright © 2020 Jon Fawcett. All rights reserved.
//

import UIKit
import Eureka
import EventKit
import EventKitUI

class SettingsViewController: FormViewController {
    var tokenRow: TextRow?
    var appStateController: AppStateController?
    var statusLabelRow: LabelRow!

    func showHideNSDetails() {
        var isHidden = false
        var isEnabled = true
        var isLoopHidden = false;
        if UserDefaultsRepository.url.value == "" || !UserDefaultsRepository.loopUser.value {
            isHidden = true
            isEnabled = false
        }
        
        if let row1 = form.rowBy(tag: "informationDisplaySettings") as? ButtonRow {
            row1.hidden = .function(["hide"],  {form in
                return isHidden
            })
            row1.evaluateHidden()
        }
        
        if UserDefaultsRepository.url.value != "" {
            isEnabled = true
        }
        
        guard let nightscoutTab = self.tabBarController?.tabBar.items![3] else { return }
        nightscoutTab.isEnabled = isEnabled
    }
    
   override func viewDidLoad() {
        super.viewDidLoad()
        if UserDefaultsRepository.forceDarkMode.value {
            overrideUserInterfaceStyle = .dark
        }
       UserDefaultsRepository.showNS.value = false
       UserDefaultsRepository.showDex.value = false
    
       let buildDetails = BuildDetails.default
       let formattedBuildDate = dateTimeUtils.formattedDate(from: buildDetails.buildDate())
       let branchAndSha = buildDetails.branchAndSha
       let expiration = dateTimeUtils.formattedDate(from: buildDetails.calculateExpirationDate())
       let expirationHeaderString = buildDetails.expirationHeaderString
       let versionManager = AppVersionManager()
       let version = versionManager.version()

        form
        +++ Section(header: "Data Settings", footer: "")
       <<< SegmentedRow<String>("units") { row in
           row.title = "Units"
           row.options = ["mg/dL", "mmol/L"]
           row.value = UserDefaultsRepository.units.value
       }.onChange { row in
           guard let value = row.value else { return }
           UserDefaultsRepository.units.value = value
       }
       <<< SwitchRow("showNS"){ row in
       row.title = "Show Nightscout Settings"
       row.value = UserDefaultsRepository.showNS.value
       }.onChange { [weak self] row in
               guard let value = row.value else { return }
               UserDefaultsRepository.showNS.value = value
       }
       <<< TextRow() { row in
           row.title = "URL"
           row.placeholder = "https://mycgm.herokuapp.com"
           row.value = UserDefaultsRepository.url.value
           row.hidden = "$showNS == false"
       }.cellSetup { (cell, row) in
           cell.textField.autocorrectionType = .no
           cell.textField.autocapitalizationType = .none
       }.onChange { row in
           guard let value = row.value else {
               UserDefaultsRepository.url.value = ""
               self.showHideNSDetails()
               return
           }
           
           var useTokenUrl = false
           
           // Attempt to handle special case: pasted URL including token
           if let urlComponents = URLComponents(string: value), let queryItems = urlComponents.queryItems {
               if let tokenItem = queryItems.first(where: { $0.name.lowercased() == "token" }) {
                   let tokenPattern = "^[^-\\s]+-[0-9a-fA-F]{16}$"
                   if let token = tokenItem.value, let _ = token.range(of: tokenPattern, options: .regularExpression) {
                       var baseComponents = urlComponents
                       baseComponents.queryItems = nil
                       if let baseURL = baseComponents.string {
                           UserDefaultsRepository.token.value = token
                           self.tokenRow?.value = token
                           self.tokenRow?.updateCell()

                           UserDefaultsRepository.url.value = baseURL
                           row.value = baseURL
                           row.updateCell()
                           useTokenUrl = true
                       }
                   }
               }
           }
           
           if !useTokenUrl {
               // Normalize input: remove unwanted characters and lowercase
               let filtered = value.replacingOccurrences(of: "[^A-Za-z0-9:/._-]", with: "", options: .regularExpression).lowercased()
               
               // Further clean-up: Remove trailing slashes
               var cleanURL = filtered
               while cleanURL.last == "/" {
                   cleanURL = String(cleanURL.dropLast())
               }
               
               UserDefaultsRepository.url.value = cleanURL
               row.value = cleanURL
               row.updateCell()
           }
           
           self.showHideNSDetails()
           globalVariables.nsVerifiedAlert = 0
           
           // Verify Nightscout URL and token
           self.checkNightscoutStatus()
       }

       <<< TextRow() { row in
           row.title = "NS Token"
           row.placeholder = "Leave blank if not using tokens"
           row.value = UserDefaultsRepository.token.value
           row.hidden = "$showNS == false"
           self.tokenRow = row
       }.cellSetup { (cell, row) in
           cell.textField.autocorrectionType = .no
           cell.textField.autocapitalizationType = .none
           cell.textField.textContentType = .password
       }.onChange { row in
           if row.value == nil {
               UserDefaultsRepository.token.value = ""
           }
           guard let value = row.value else { return }
           UserDefaultsRepository.token.value = value
           globalVariables.nsVerifiedAlert = 0
           
           // Verify Nightscout URL and token
           self.checkNightscoutStatus()
       }
       <<< LabelRow() { row in
           row.title = "NS Status"
           row.value = "Checking..."
           statusLabelRow = row
           row.hidden = "$showNS == false"
       }
       <<< SwitchRow("loopUser"){ row in
           row.title = "Download Loop/iAPS Data"
           row.tag = "loopUser"
           row.value = UserDefaultsRepository.loopUser.value
           row.hidden = "$showNS == false"
       }.onChange { row in
                   guard let value = row.value else { return }
                   UserDefaultsRepository.loopUser.value = value
           }
        
       <<< SwitchRow("showDex"){ row in
       row.title = "Show Dexcom Settings"
       row.value = UserDefaultsRepository.showDex.value
       }.onChange { row in
               guard let value = row.value else { return }
               UserDefaultsRepository.showDex.value = value
       }
        <<< TextRow(){ row in
            row.title = "User Name"
            row.value = UserDefaultsRepository.shareUserName.value
            row.hidden = "$showDex == false"
        }.cellSetup { (cell, row) in
            cell.textField.autocorrectionType = .no
            cell.textField.autocapitalizationType = .none
        }.onChange { row in
            if row.value == nil {
                UserDefaultsRepository.shareUserName.value = ""
            }
            guard let value = row.value else { return }
            UserDefaultsRepository.shareUserName.value = value
            globalVariables.dexVerifiedAlert = 0
        }
        <<< TextRow(){ row in
            row.title = "Password"
            row.value = UserDefaultsRepository.sharePassword.value
            row.hidden = "$showDex == false"
        }.cellSetup { (cell, row) in
            cell.textField.autocorrectionType = .no
            cell.textField.isSecureTextEntry = true
            cell.textField.autocapitalizationType = .none
        }.onChange { row in
            if row.value == nil {
                UserDefaultsRepository.sharePassword.value = ""
            }
            guard let value = row.value else { return }
            UserDefaultsRepository.sharePassword.value = value
            globalVariables.dexVerifiedAlert = 0
        }
        <<< SegmentedRow<String>("shareServer") { row in
            row.title = "Server"
            row.options = ["US", "NON-US"]
            row.value = UserDefaultsRepository.shareServer.value
            row.hidden = "$showDex == false"
        }.onChange { row in
            guard let value = row.value else { return }
            UserDefaultsRepository.shareServer.value = value
        }
        
        +++ Section("App Settings")
       
        <<< ButtonRow() {
           $0.title = "General Settings"
           $0.presentationMode = .show(
               controllerProvider: .callback(builder: {
                  let controller = GeneralSettingsViewController()
                  controller.appStateController = self.appStateController
                  return controller
               }
           ), onDismiss: nil)
        }
        <<< ButtonRow("graphSettings") {
           $0.title = "Graph Settings"
           $0.presentationMode = .show(
               controllerProvider: .callback(builder: {
                  let controller = GraphSettingsViewController()
                  controller.appStateController = self.appStateController
                  return controller
               }
           ), onDismiss: nil)
        }
        <<< ButtonRow("informationDisplaySettings") {
           $0.title = "Information Display Settings"
           $0.presentationMode = .show(
               controllerProvider: .callback(builder: {
                  let controller = InfoDisplaySettingsViewController()
                  controller.appStateController = self.appStateController
                  return controller
               }
           ), onDismiss: nil)
            
        }
        
        +++ Section("Integrations")
        <<< ButtonRow() {
           $0.title = "Apple Watch and Carplay"
           $0.presentationMode = .show(
               controllerProvider: .callback(builder: {
                  let controller = WatchSettingsViewController()
                  controller.appStateController = self.appStateController
                  return controller
               }
           ), onDismiss: nil)
            
        }
        
       +++ Section("Advanced Settings")
        <<< ButtonRow() {
           $0.title = "Advanced Settings"
           $0.presentationMode = .show(
               controllerProvider: .callback(builder: {
                  let controller = AdvancedSettingsViewController()
                  controller.appStateController = self.appStateController
                  return controller
               }
           ), onDismiss: nil)
            
        }

       +++ Section("Build Information")
       <<< LabelRow() {
           $0.title = "Version"
           $0.value = version
           $0.tag = "currentVersionRow"
       }
       <<< LabelRow() {
           $0.title = "Latest version"
           $0.value = "Fetching..."
           $0.tag = "latestVersionRow"
       }
       <<< LabelRow() {
           $0.title = expirationHeaderString
           $0.value = expiration
           $0.hidden = Condition(booleanLiteral: isMacApp())
       }
       <<< LabelRow() {
           $0.title = "Built"
           $0.value = formattedBuildDate
       }
       <<< LabelRow() {
           $0.title = "Branch"
           $0.value = branchAndSha
       }
       
       showHideNSDetails()
       checkNightscoutStatus()
    }
    
    override func viewWillAppear(_ animated: Bool) {
        super.viewWillAppear(animated)
        
        refreshVersionInfo()
        checkNightscoutStatus()
    }
    
    func refreshVersionInfo() {
        let versionManager = AppVersionManager()
        versionManager.checkForNewVersion { latestVersion, isNewer, isBlacklisted in
            DispatchQueue.main.async {
                if let currentVersionRow = self.form.rowBy(tag: "currentVersionRow") as? LabelRow {
                    currentVersionRow.cell.detailTextLabel?.textColor = self.getColor(isBlacklisted: isBlacklisted, isNewer: isNewer, isCurrent: latestVersion == versionManager.version())
                    currentVersionRow.updateCell()
                }
                
                if let latestVersionRow = self.form.rowBy(tag: "latestVersionRow") as? LabelRow {
                    latestVersionRow.value = latestVersion ?? "Unknown"
                    latestVersionRow.updateCell()
                }
            }
        }
    }
    
    private func getColor(isBlacklisted: Bool, isNewer: Bool, isCurrent: Bool) -> UIColor {
        if isBlacklisted {
            return .red
        } else if isNewer {
            return .orange
        } else if isCurrent {
            return .green
        } else {
            return .secondaryLabel
        }
    }
    
    func isMacApp() -> Bool {
#if targetEnvironment(macCatalyst)
        return true
#else
        return false
#endif
    }
    
    func updateStatusLabel(error: NightscoutUtils.NightscoutError?) {
        if let error = error {
            switch error {
            case .invalidURL:
                statusLabelRow.value = "Invalid URL"
            case .networkError:
                statusLabelRow.value = "Network Error"
            case .invalidToken:
                statusLabelRow.value = "Invalid Token"
            case .tokenRequired:
                statusLabelRow.value = "Token Required"
            case .siteNotFound:
                statusLabelRow.value = "Site Not Found"
            case .unknown:
                statusLabelRow.value = "Unknown Error"
            case .emptyAddress:
                statusLabelRow.value = "Address Empty"
            }
        } else {
            statusLabelRow.value = "OK"
            NotificationCenter.default.post(name: NSNotification.Name("refresh"), object: nil)
        }
        statusLabelRow.updateCell()
    }
    
    func checkNightscoutStatus() {
        NightscoutUtils.verifyURLAndToken(urlUser: UserDefaultsRepository.url.value, token: UserDefaultsRepository.token.value) { error in
            DispatchQueue.main.async {
                self.updateStatusLabel(error: error)
            }
        }
    }
}