import Combine
import SwiftUI

// 1
class Store: BindableObject {

    // 2
    public let didChange = PassthroughSubject<Store, Never>()

    private var currentState: [TodoItem]
    private var reducer: TodoReducer

    // 3
    var state: [TodoItem] { currentState }

    // 4
    init(initialState: [TodoItem])  {
        self.currentState = initialState
        self.reducer = TodoReducer()
    }

    // 5
     func dispatch(action: TodoAction) {
        let newState = reducer.reduce(oldState: currentState, action: action)
        currentState = newState

         // 6
        didChange.send(self)
    }
}