EmployeeDirectory-SwiftUI/EmployeeDirectory/Views/EmployeeListView.swift

//
//  ContentView.swift
//  EmployeeDirectory
//
//  Created by Matt Bruce on 3/3/25.
//

import SwiftUI

@MainActor
struct EmployeeListView: View {
    @StateObject public var viewModel: EmployeesViewModel
    @State private var path = NavigationPath()
    
    // Dependency injection via the initializer.
    init(viewModel: EmployeesViewModel? = nil) {
        _viewModel = StateObject(wrappedValue: viewModel ?? .init(service: EmployeeService()))
    }
    
    var body: some View {
        NavigationStack(path: $path) {
            List {
                //build out dynamic rows first
                ForEach(viewModel.employees, id: \.id) { employee in
                    EmployeeRowView(viewModel: .init(employee: employee))
                        .onTapGesture {
                            path.append(employee)
                        }
                        .listRowInsets(.none)
                        .listRowSeparator(.hidden)
                }
                
                //add static row if there is a next page
                if viewModel.hasNextPage {
                    ProgressView()
                        .frame(maxWidth: .infinity, alignment: .center)
                        .task {
                            await viewModel.loadEmployees()
                        }
                }
            }
            .navigationTitle("Employees")
            .navigationDestination(for: Employee.self, destination: { employee in
                EmployeeDetailsView(viewModel: .init(employee: employee))
            })
            .listStyle(.insetGrouped)
        }
        .task {
            if viewModel.employees.isEmpty {
                await viewModel.loadEmployees()
            }
        }
    }
}

#Preview {
    EmployeeListView(viewModel: .init(service: MockEmployeeService()))
}