//
//  EmployeesViewModel.swift
//  EmployeeDirectory
//
//  Created by Matt Bruce on 1/20/25.
//

import Foundation

/// ViewModel that will be bound to an Employees model and used
/// specifically with the EmployeesViewController.
@MainActor
public class EmployeesViewModel: ObservableObject {
    private var employeeService: EmployeeServiceProtocol = EmployeeService()

    @Published public private(set) var employees: [Employee] = []
    @Published public private(set) var errorMessage: String? = nil
    @Published public private(set) var isLoading: Bool = false
    
    public init() {}
    
    public func fetchEmployees() {
        // resetting values out the values before fetching new data
        errorMessage = nil
        isLoading = true

        Task {
            do {
                // Fetch employees using the async method
                let wrapper = try await employeeService.getEmployees()
                
                // Update published properties
                employees = wrapper.employees
                isLoading = false

            } catch {
                // Handle errors
                employees = []
                isLoading = false
                errorMessage = "An unexpected error occurred, please try to refresh"
            }
        }

    }
    
    public func changeService(to employeeService: EmployeeServiceProtocol) {
        self.employeeService = employeeService
        fetchEmployees()
    }
}