/*
 * Copyright (c) 2021 BWI GmbH
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

import Foundation
import KeychainAccess

@objcMembers
final class  WorkTimeStore : NSObject {

    private enum StoreKeys {
        static let WorkTimeEnabledKey = "WorkTimeEnabled"
        static let WorkTimeKey = "WorkTime"
        static let WorkTimeInRoomsKey = "WorkTimeInRooms"
    }
    
    private struct BwiSettingsConstants {
        static let bwiSettingsKeychainService: String = BuildSettings.baseBundleIdentifier + ".bwi-WorkTime-service"
    }
    
    private let vault: KeyValueVault
    
    private let userId: String
    
    init(userId : String) {
        self.userId = userId
        vault = KeychainVault(Keychain(service: BwiSettingsConstants.bwiSettingsKeychainService,
                                                     accessGroup: BuildSettings.keychainAccessGroup))
        super.init()
    }
    
    func reset() {
        do {
            try vault.removeObject(forKey: StoreKeys.WorkTimeKey)
            try vault.removeObject(forKey: StoreKeys.WorkTimeEnabledKey)
            try vault.removeObject(forKey: StoreKeys.WorkTimeInRoomsKey)
        } catch let error {
            NSLog("[WorkTime] Error when removing objects: \(error)")
        }
        
    }
    
    // MARK: Servers
    
    var workTimeEnabled : Bool {
        get {
            do {
                return try vault.bool(forKey: StoreKeys.WorkTimeEnabledKey) ?? false
            } catch {
                return false
            }
        }
        set {
            do {
                try vault.set(newValue, forKey: StoreKeys.WorkTimeEnabledKey)
            } catch let error {
                NSLog("[WorkTime] Error when storing rest time enabled to the vault: \(error)")
            }
        }
    }
    
    var workTime : WorkTime {
        get {
            do {
                guard let data = try vault.data(forKey: StoreKeys.WorkTimeKey) else {
                    return WorkTime()
                }
                return try JSONDecoder().decode(WorkTimeUser.self, from: data).WorkTime
            } catch {
                return WorkTime()
            }
        }
        set {
            do {
                let userWorkTime = WorkTimeUser(WorkTime: newValue, userId: userId)
                let data = try JSONEncoder().encode(userWorkTime)
                try vault.set(data, forKey: StoreKeys.WorkTimeKey)
            } catch let error {
                NSLog("[WorkTime] Error when storing addional header to the vault: \(error)")
            }
        }
    }

    func activateWorkTimeInRoom(_ roomId: String) {
        let workTimeInRoom = WorkTimeInRoom(userId: userId, roomId: roomId, isWorkTimeActive: true)
        var roomSet = roomSetFromStore()
        roomSet.update(with: workTimeInRoom)
        saveRoomSetToStore(roomSet)
    }
    
    func deactivateWorkTimeInRoom(_ roomId: String) {
        let workTimeInRoom = WorkTimeInRoom(userId: userId, roomId: roomId, isWorkTimeActive: false)
        var roomSet = roomSetFromStore()
        roomSet.update(with: workTimeInRoom)
        saveRoomSetToStore(roomSet)
    }
    
    @objc func isWorkTimeRoom(_ roomId: String) -> Bool {
        let roomSet = roomSetFromStore()
        if roomSet.first(where: {$0.roomId == roomId && $0.userId == userId}) != nil {
            return true
        }
        return false
    }
    
    @objc func isWorkTimeInRoomActive(_ roomId: String) -> Bool {
        let roomSet = roomSetFromStore()
        
        if let WorkTimeInRoom = roomSet.first(where: {$0.roomId == roomId && $0.userId == userId}) {
            return WorkTimeInRoom.isWorkTimeActive
        }
        return false
    }
    
    private func roomSetFromStore() -> Set<WorkTimeInRoom> {
        do {
            guard let data = try vault.data(forKey: StoreKeys.WorkTimeInRoomsKey) else {
                return Set<WorkTimeInRoom>()
            }
            
            return try JSONDecoder().decode(Set<WorkTimeInRoom>.self, from: data)
        } catch {
            return Set<WorkTimeInRoom>()
        }
    }
    
    private func saveRoomSetToStore(_ roomSet: Set<WorkTimeInRoom>) {
        do {
            print("saveRoomSetToStore", roomSet)
            let dataOut = try JSONEncoder().encode(roomSet)
            try vault.set(dataOut, forKey: StoreKeys.WorkTimeInRoomsKey)
        } catch {
        }
    }
}