//
//  LocalData.swift
//  Reader
//
//  Created by Shadowfacts on 11/25/21.
//

import Foundation

struct LocalData {
    
    private init() {}
    
    private static let encoder = JSONEncoder()
    private static let decoder = JSONDecoder()
    
    static var accounts: [Account] {
        get {
            guard let data = UserDefaults.standard.data(forKey: "accounts"),
                  let accounts = try? decoder.decode([Account].self, from: data) else {
                return []
            }
            return accounts
        }
        set {
            let data = try! encoder.encode(newValue)
            UserDefaults.standard.set(data, forKey: "accounts")
        }
    }
    
    static var mostRecentAccountID: UUID? {
        get {
            guard let str = UserDefaults.standard.string(forKey: "mostRecentAccountID") else {
                return nil
            }
            return UUID(uuidString: str)
        }
        set {
            UserDefaults.standard.set(newValue?.uuidString, forKey: "mostRecentAccountID")
        }
    }
    
    static func mostRecentAccount() -> Account? {
        guard let id = mostRecentAccountID else {
            return nil
        }
        return accounts.first(where: { $0.id == id })
    }
    
    struct Account: Codable {
        let id: UUID
        let instanceURL: URL
        let clientID: String
        let clientSecret: String
        let accessToken: String
        // todo: refresh tokens
        
        init(instanceURL: URL, clientID: String, clientSecret: String, accessToken: String) {
            self.id = UUID()
            self.instanceURL = instanceURL
            self.clientID = clientID
            self.clientSecret = clientSecret
            self.accessToken = accessToken
        }
    }
    
}