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

import Foundation

@MainActor
public class EmployeesViewModel: ObservableObject {
    private let service: EmployeeService
    private var serviceMode: EmployeeServiceMode = .production

    @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(service: EmployeeService = EmployeeService()) {
        self.service = service
    }
    
    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 service.getEmployees(serviceMode)
                
                // Update published properties
                self.employees = wrapper.employees
                self.isLoading = false

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

    }
    
    public func changeMode(to mode: EmployeeServiceMode) {
        serviceMode = mode
        fetchEmployees()
    }
}