elpha-ios/elpha-ios/AuthenticationManager.swift

//
//  AuthenticationManager.swift
//  elpha-ios
//
//  Created by Dwayne Harris on 8/25/18.
//  Copyright © 2018 Elpha. All rights reserved.
//

import CoreData
import MastodonKit
import UIKit

class AuthenticationManager {
    static let shared = AuthenticationManager()
    
    var sessions: [SessionMO] {
        get {
            do {
                let request = NSFetchRequest<SessionMO>(entityName: "Session")
                return try CoreDataManager.shared.context.fetch(request)
            } catch {
                print("Error fetching Sessions \(error)")
                return []
            }
        }
    }
    
    var session: SessionMO? {
        get {
            let request = NSFetchRequest<SessionMO>(entityName: "Session")
            request.predicate = NSPredicate(format: "selected = YES")
            
            do {
                let results = try CoreDataManager.shared.context.fetch(request)
                return results.first
            } catch {
                print("Error fetching Session \(error)")
                return nil
            }
        }
    }
    
    var token: String? {
        get {
            guard let account = session?.account else {
                return nil
            }
            
            return KeychainWrapper.standard.string(forKey: "token:\(String(describing: account.acct))")
        }
    }
    
    var mkClient: Client? {
        get {
            guard let client = session?.client else {
                return nil
            }
            
            return Client(baseURL: "https://\(client.url!)", accessToken: token)
        }
    }
    
    func saveSession(client: ClientMO, account: AccountMO, token: String) -> SessionMO? {
        if let session = self.session {
            session.selected = false
        }
        
        let session = SessionMO(context: CoreDataManager.shared.context)
        session.client = client
        session.account = account
        session.order = 0
        session.createdAt = Date()
        session.selected = true
        
        CoreDataManager.shared.saveContext()
        KeychainWrapper.standard.set(token, forKey: "token:\(String(describing: account.acct))")
        
        return session
    }
}