using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace ConsoleAdvancedTopics
{
    public class ProcessingOrderAfterApproval // Thread Task
    {
        // Stuff here that runs with ProcessingOrderAferApproval
        // vars / methods / etc...

        /* === New Thread with 3 Tasks ========  */

        // Thread <ProcessOrder Task> and 2 Tasks

        // Task ProcessShippingDetails private to Parent Task
        private async Task ProcessShippingDetails(int orderId)
        {
            // Run()
            await Task.Run(() =>
            {
                Console.WriteLine($"Starting shipping process for: {orderId}");
                Thread.Sleep(4000); // ms
                Console.WriteLine($"Finished shipping process for: {orderId}");
            }); // Run()

        } // Task ProcessShippingDetails

        // Task ProcessWarehouseDetails private to Parent Task

        private async Task ProcessWarehouseDetails(int orderId)
        {
            // Run()
            await Task.Run(() =>
            {
                Console.WriteLine($"Starting warehouse process for: {orderId}");
                Thread.Sleep(7000); // ms

                int stock = 0; // inventory 1 ok 0 outOfStock

                if (stock == 0)
                {
                    // Out of Stock
                    Console.WriteLine("Items out of stock, do something");
                    // capture the response from the api for the issue
                }

                Console.WriteLine($"Finished warehouse process for: {orderId}");
                
            }); // Run()

        } // Task ProcessWarehouseDetails


        // Task ProcessOrder Parent Task public to the class

        public async Task ProcessOrder(int orderId)
        {
            Console.WriteLine($"Starting Parent Process for {orderId}");
            // stuff here to do
            Thread.Sleep(3000);

            // Run the 2 Tasks
            Task shippingTask = ProcessShippingDetails(orderId);
            Task warehouseTask = ProcessWarehouseDetails(orderId);

            // continue with other stuff here... x amount of time

            Console.WriteLine("More stuff happening here...");

            // Parent Task has to wait until all child tasks complete
            await Task.WhenAll(shippingTask, warehouseTask);

            Console.WriteLine($"Finished Parent Process for {orderId}");


        } // Task ProcessOrder


    } // class

} // namespace