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using System.Diagnostics;
using System.Text.Json;
using Microsoft.Extensions.Options;
namespace CrupestApi.Commons.Crud;
// TODO: Register this.
/// <summary>
/// Contains all you need to do with json.
/// </summary>
public class EntityJsonHelper<TEntity> where TEntity : class
{
private readonly TableInfo _table;
private readonly JsonSerializerOptions _jsonSerializerOptions;
public EntityJsonHelper(TableInfoFactory tableInfoFactory)
{
_table = tableInfoFactory.Get(typeof(TEntity));
_jsonSerializerOptions = new JsonSerializerOptions();
_jsonSerializerOptions.AllowTrailingCommas = true;
_jsonSerializerOptions.PropertyNameCaseInsensitive = true;
_jsonSerializerOptions.PropertyNamingPolicy = JsonNamingPolicy.CamelCase;
foreach (var type in _table.Columns.Select(c => c.ColumnType))
{
if (type.JsonConverter is not null)
{
_jsonSerializerOptions.Converters.Add(type.JsonConverter);
}
}
}
public virtual JsonDocument ConvertEntityToJson(object? entity)
{
Debug.Assert(entity is null || entity is TEntity);
return JsonSerializer.SerializeToDocument<TEntity?>((TEntity?)entity, _jsonSerializerOptions);
}
public virtual TEntity? ConvertJsonToEntity(JsonDocument json)
{
var entity = json.Deserialize<TEntity>();
if (entity is null) return null;
foreach (var column in _table.Columns)
{
var propertyValue = column.PropertyInfo?.GetValue(entity);
if ((column.IsAutoIncrement || column.IsGenerated) && propertyValue is not null)
{
throw new Exception("You can't specify this property because it is auto generated.");
}
}
return entity;
}
}
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