ShoppingApp/Weifer.ShoppingApp.API/RestApi/ShoppingItemApiController.cs

using Microsoft.AspNetCore.Mvc;
using Microsoft.EntityFrameworkCore;
using Weifer.Database.EF;
using Weifer.Database.EF.Entitys;
using Weifer.ShoppingApp.API.Models;

namespace Weifer.ShoppingApp.API.RestApi
{
    [ApiController]
    [Route("api/[controller]")]
    public class ShoppingItemApiController : ControllerBase
    {

        public readonly DatabaseContext dbContext;

        public ShoppingItemApiController(DatabaseContext dbContext)
        {
            this.dbContext = dbContext;
        }

        [HttpGet("getItems")]
        public async Task<IActionResult> GetMainItems([FromQuery] string customerId)
        {
            if (!Guid.TryParse(customerId, out var guidCustomerId))
            {
                return BadRequest("Invalid Customer ID");
            }

            var shoppingItems = await dbContext.ShoppingLists
                .Where(x => x.CustomerId == guidCustomerId && x.ShoppingListName == "MainList")
                .Include(x => x.ShoppingItems)
                .SelectMany(x => x.ShoppingItems) // W<>hlt nur die ShoppingItems aus
                .ToListAsync();

            return Ok(shoppingItems);
        }

        [HttpPost("addMainItem")]
        public async Task<IActionResult> AddMainItem([FromBody] AddItemRequest request)
        {
            if (!Guid.TryParse(request.CustomerId, out var guidCustomerId))
            {
                return BadRequest("Invalid Customer ID");
            }

            var itemToAdd = new ShoppingItem
            {
                ShoppingItemId = Guid.NewGuid(),
                ShoppingListId = await dbContext.ShoppingLists
                    .Where(x => x.CustomerId == guidCustomerId && x.ShoppingListName == "MainList")
                    .Select(x => x.ShoppingListId)
                    .FirstOrDefaultAsync(),
                Description = request.ItemName,
                Number = 1,
                Purchased = false,
            };

            dbContext.ShoppingItems.Add(itemToAdd);
            await dbContext.SaveChangesAsync();
            return Ok();
        }
    }
    public class AddItemRequest
    {
        public string CustomerId { get; set; }
        public string ItemName { get; set; }
    }
}