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using System.Diagnostics;
using System.Text.Json;
using System.Text.Json.Serialization;
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 Dictionary<string, object?> ConvertEntityToDictionary(object? entity)
{
Debug.Assert(entity is null || entity is TEntity);
var result = new Dictionary<string, object?>();
foreach (var column in _table.PropertyColumns)
{
var propertyInfo = column.PropertyInfo;
var value = propertyInfo!.GetValue(entity);
result[column.ColumnName] = value;
}
return result;
}
public virtual string ConvertEntityToJson(object? entity)
{
Debug.Assert(entity is null || entity is TEntity);
var dictionary = ConvertEntityToDictionary(entity);
return JsonSerializer.Serialize(dictionary, _jsonSerializerOptions);
}
public virtual TEntity ConvertDictionaryToEntityForInsert(IReadOnlyDictionary<string, object?> dictionary)
{
var result = Activator.CreateInstance<TEntity>()!;
foreach (var column in _table.PropertyColumns)
{
var propertyInfo = column.PropertyInfo!;
var value = dictionary.GetValueOrDefault(column.ColumnName);
if (column.IsGenerated)
{
if (value is not null)
{
throw new UserException($"{propertyInfo.Name} is auto generated. Don't specify it.");
}
}
if (value is null)
{
if (column.IsNotNull && !column.CanBeGenerated)
{
throw new UserException($"{propertyInfo.Name} can't be null.");
}
propertyInfo.SetValue(result, null);
}
else
{
// Check type
var columnType = column.ColumnType;
if (columnType.ClrType.IsAssignableFrom(value.GetType()))
propertyInfo.SetValue(result, value);
else
throw new UserException($"{propertyInfo.Name} is of wrong type.");
}
}
return result;
}
public TEntity ConvertJsonToEntityForInsert(string json)
{
var dictionary = JsonSerializer.Deserialize<Dictionary<string, object?>>(json, _jsonSerializerOptions)!;
return ConvertDictionaryToEntityForInsert(dictionary);
}
}
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