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using System.Globalization;
using System.Text.Json;
using Microsoft.Extensions.Options;
namespace CrupestApi.Commons.Crud;
/// <summary>
/// Contains all you need to do with json.
/// </summary>
public class EntityJsonHelper<TEntity> where TEntity : class
{
private readonly TableInfo _table;
private readonly IOptionsMonitor<JsonSerializerOptions> _jsonSerializerOptions;
public EntityJsonHelper(ITableInfoFactory tableInfoFactory, IOptionsMonitor<JsonSerializerOptions> jsonSerializerOptions)
{
_table = tableInfoFactory.Get(typeof(TEntity));
_jsonSerializerOptions = jsonSerializerOptions;
}
public Dictionary<string, object?> ConvertEntityToDictionary(TEntity entity, bool includeNonColumnProperties = false)
{
var result = new Dictionary<string, object?>();
foreach (var column in _table.PropertyColumns)
{
var value = column.PropertyInfo!.GetValue(entity);
var realValue = column.ColumnType.ConvertToDatabase(value);
result[column.ColumnName] = realValue;
}
if (includeNonColumnProperties)
{
foreach (var propertyInfo in _table.NonColumnProperties)
{
var value = propertyInfo.GetValue(entity);
result[propertyInfo.Name] = value;
}
}
return result;
}
public string ConvertEntityToJson(TEntity entity, bool includeNonColumnProperties = false)
{
var dictionary = ConvertEntityToDictionary(entity, includeNonColumnProperties);
return JsonSerializer.Serialize(dictionary, _jsonSerializerOptions.CurrentValue);
}
private object? ConvertJsonValue(JsonElement? optionalJsonElement, Type type, string propertyName)
{
if (optionalJsonElement is null)
{
return null;
}
var jsonElement = optionalJsonElement.Value;
if (jsonElement.ValueKind is JsonValueKind.Null or JsonValueKind.Undefined)
{
return null;
}
if (jsonElement.ValueKind is JsonValueKind.String)
{
if (type != typeof(string))
{
throw new UserException($"Property {propertyName} must be a string.");
}
return jsonElement.GetString()!;
}
if (jsonElement.ValueKind is JsonValueKind.True or JsonValueKind.False)
{
if (type != typeof(bool))
{
throw new UserException($"Property {propertyName} must be a boolean.");
}
return jsonElement.GetBoolean();
}
if (jsonElement.ValueKind is JsonValueKind.Number)
{
try
{
return Convert.ChangeType(jsonElement.GetRawText(), type, CultureInfo.InvariantCulture);
}
catch (Exception)
{
throw new UserException($"Property {propertyName} must be a valid number.");
}
}
throw new UserException($"Property {propertyName} is of wrong type.");
}
public Dictionary<string, JsonElement> ConvertJsonObjectToDictionary(JsonElement jsonElement)
{
var result = new Dictionary<string, JsonElement>();
foreach (var property in jsonElement.EnumerateObject())
{
result[property.Name.ToLower()] = property.Value;
}
return result;
}
public TEntity ConvertJsonToEntityForInsert(JsonElement jsonElement)
{
if (jsonElement.ValueKind is not JsonValueKind.Object)
throw new ArgumentException("The jsonElement must be an object.");
var result = Activator.CreateInstance<TEntity>();
Dictionary<string, JsonElement> jsonProperties = ConvertJsonObjectToDictionary(jsonElement);
foreach (var column in _table.PropertyColumns)
{
var jsonPropertyValue = jsonProperties.GetValueOrDefault(column.ColumnName.ToLower());
var value = ConvertJsonValue(jsonPropertyValue, column.ColumnType.DatabaseClrType, column.ColumnName);
if (column.IsOnlyGenerated && value is not null)
{
throw new UserException($"Property {column.ColumnName} is auto generated, you cannot set it.");
}
if (!column.CanBeGenerated && value is null && column.IsNotNull)
{
throw new UserException($"Property {column.ColumnName} can NOT be generated, you must set it.");
}
var realValue = column.ColumnType.ConvertFromDatabase(value);
column.PropertyInfo!.SetValue(result, realValue);
}
return result;
}
public TEntity ConvertJsonToEntityForInsert(string json)
{
var jsonElement = JsonSerializer.Deserialize<JsonElement>(json, _jsonSerializerOptions.CurrentValue);
return ConvertJsonToEntityForInsert(jsonElement!);
}
public TEntity ConvertJsonToEntityForUpdate(JsonElement jsonElement, out UpdateBehavior updateBehavior)
{
if (jsonElement.ValueKind is not JsonValueKind.Object)
throw new UserException("The jsonElement must be an object.");
updateBehavior = UpdateBehavior.None;
Dictionary<string, JsonElement> jsonProperties = ConvertJsonObjectToDictionary(jsonElement);
bool saveNull = false;
if (jsonProperties.TryGetValue("$saveNull".ToLower(), out var saveNullValue))
{
if (saveNullValue.ValueKind is JsonValueKind.True)
{
updateBehavior |= UpdateBehavior.SaveNull;
saveNull = true;
}
else if (saveNullValue.ValueKind is JsonValueKind.False)
{
}
else
{
throw new UserException("The $saveNull must be a boolean.");
}
}
var result = Activator.CreateInstance<TEntity>();
foreach (var column in _table.PropertyColumns)
{
if (jsonProperties.TryGetValue(column.ColumnName.ToLower(), out var jsonPropertyValue))
{
if (jsonPropertyValue.ValueKind is JsonValueKind.Null or JsonValueKind.Undefined)
{
if ((column.IsOnlyGenerated || column.IsNoUpdate) && saveNull)
{
throw new UserException($"Property {column.ColumnName} is auto generated or not updatable, you cannot set it.");
}
column.PropertyInfo!.SetValue(result, null);
}
else
{
if (column.IsOnlyGenerated || column.IsNoUpdate)
{
throw new UserException($"Property {column.ColumnName} is auto generated or not updatable, you cannot set it.");
}
var value = ConvertJsonValue(jsonPropertyValue, column.ColumnType.DatabaseClrType, column.ColumnName);
var realValue = column.ColumnType.ConvertFromDatabase(value);
column.PropertyInfo!.SetValue(result, realValue);
}
}
}
return result;
}
public TEntity ConvertJsonToEntityForUpdate(string json, out UpdateBehavior updateBehavior)
{
var jsonElement = JsonSerializer.Deserialize<JsonElement>(json, _jsonSerializerOptions.CurrentValue);
return ConvertJsonToEntityForUpdate(jsonElement!, out updateBehavior);
}
}
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