DbFirst/DbFirst.BlazorWebApp/Services/CatalogApiClient.cs

using System.Net;
using System.Net.Http.Json;
using DbFirst.BlazorWebApp.Models;

namespace DbFirst.BlazorWebApp.Services;

public class CatalogApiClient
{
    private readonly HttpClient _httpClient;
    private const string Endpoint = "api/catalogs";

    public CatalogApiClient(HttpClient httpClient)
    {
        _httpClient = httpClient;
    }

    public async Task<List<CatalogReadDto>> GetAllAsync()
    {
        var result = await _httpClient.GetFromJsonAsync<List<CatalogReadDto>>(Endpoint);
        return result ?? new List<CatalogReadDto>();
    }

    public async Task<CatalogReadDto?> GetByIdAsync(int id)
    {
        return await _httpClient.GetFromJsonAsync<CatalogReadDto>($"{Endpoint}/{id}");
    }

    public async Task<ApiResult<CatalogReadDto?>> CreateAsync(CatalogWriteDto dto)
    {
        var response = await _httpClient.PostAsJsonAsync(Endpoint, dto);
        if (response.IsSuccessStatusCode)
        {
            var payload = await response.Content.ReadFromJsonAsync<CatalogReadDto>();
            return ApiResult<CatalogReadDto?>.Ok(payload);
        }

        var error = await ApiClientHelper.ReadErrorAsync(response);
        return ApiResult<CatalogReadDto?>.Fail(error);
    }

    public async Task<ApiResult<bool>> UpdateAsync(int id, CatalogWriteDto dto)
    {
        var response = await _httpClient.PutAsJsonAsync($"{Endpoint}/{id}", dto);
        if (response.IsSuccessStatusCode)
        {
            return ApiResult<bool>.Ok(true);
        }

        var error = await ApiClientHelper.ReadErrorAsync(response);
        return ApiResult<bool>.Fail(error);
    }

    public async Task<ApiResult<bool>> DeleteAsync(int id)
    {
        var response = await _httpClient.DeleteAsync($"{Endpoint}/{id}");
        if (response.IsSuccessStatusCode)
        {
            return ApiResult<bool>.Ok(true);
        }

        var error = await ApiClientHelper.ReadErrorAsync(response);
        return ApiResult<bool>.Fail(error);
    }
}

public record ApiResult<T>(bool Success, T? Value, string? Error)
{
    public static ApiResult<T> Ok(T? value) => new(true, value, null);
    public static ApiResult<T> Fail(string? error) => new(false, default, error);
}