//
//  MessageBookShelfService.swift
//  Malinka
//
//  Created by Juraldinio on 1/19/23.
//  Copyright © 2023 NUT.Tech. All rights reserved.
//

import Foundation
import WalletKit
import Combine

protocol MessageBookShelf {
    
}

final class MessageBookShelfService {
    
    private let bank: Bank
    private var cancellables = Set<AnyCancellable>()
    
    private var shelves = [String: Account.Service.AccountHistory]()
    private var wallet: WalletKit.Wallet?
    
    var activeBook: Account.Service.AccountHistory? {
        guard let wallet = self.wallet else { return nil }
        return self.book(for: wallet)
    }
    
    init(with bank: Bank) {
        self.bank = bank
        
        bank.activePublisher
            .sink { [weak self] wallet in
                self?.wallet = wallet
                // try? self.load(username: Accounts().current?.name)
            }
            .store(in: &self.cancellables)
    }
    
    func book(for wallet: WalletKit.Wallet) -> Account.Service.AccountHistory? {
        let name = wallet.name
        guard !name.isEmpty else { return nil }
        if let book = self.shelves[name] { return book }
        
        guard let book = try? Account.Service.AccountHistory(username: name) else { return nil }
        self.shelves[name] = book
        return self.shelves[name]
    }
    
    func fetchAll() { self.shelves.values.forEach { $0.fetch() } }
}