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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(TableInfoFactory 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 static Type MapJsonValueKindToType(JsonElement jsonElement, out object? value)
{
switch (jsonElement.ValueKind)
{
case JsonValueKind.String:
{
value = jsonElement.GetString()!;
return typeof(string);
}
case JsonValueKind.Number:
{
value = jsonElement.GetDouble();
return typeof(double);
}
case JsonValueKind.True:
case JsonValueKind.False:
{
value = jsonElement.GetBoolean();
return typeof(bool);
}
case JsonValueKind.Null:
{
value = null;
return typeof(object);
}
default:
throw new UserException("Unsupported json value type.");
}
}
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>();
foreach (var column in _table.PropertyColumns)
{
if (jsonElement.TryGetProperty(column.ColumnName, out var jsonValue))
{
if (column.IsGenerated)
{
throw new UserException($"Property {column.ColumnName} is auto generated, you cannot set it.");
}
var valueType = MapJsonValueKindToType(jsonValue, out var value);
if (!valueType.IsAssignableTo(column.ColumnType.DatabaseClrType))
{
throw new UserException($"Property {column.ColumnName} is of wrong type.");
}
var realValue = column.ColumnType.ConvertFromDatabase(value);
column.PropertyInfo!.SetValue(result, realValue);
}
else
{
if (!column.CanBeGenerated)
{
throw new UserException($"Property {column.ColumnName} is not auto generated, you must set it.");
}
}
}
return result;
}
public TEntity ConvertJsonToEntityForInsert(string json)
{
var jsonElement = JsonSerializer.Deserialize<JsonElement>(json, _jsonSerializerOptions.CurrentValue);
return ConvertJsonToEntityForInsert(jsonElement!);
}
public TEntity ConvertJsonToEntityForUpdate(JsonElement jsonElement, out UpdateBehavior updateBehavior)
{
if (jsonElement.ValueKind is not JsonValueKind.Object)
throw new UserException("The jsonElement must be an object.");
updateBehavior = UpdateBehavior.None;
if (jsonElement.TryGetProperty("$saveNull", out var saveNullValue))
{
if (saveNullValue.ValueKind is JsonValueKind.True)
{
updateBehavior |= UpdateBehavior.SaveNull;
}
else if (saveNullValue.ValueKind is JsonValueKind.False)
{
}
else
{
throw new UserException("The $saveNull must be a boolean.");
}
}
var result = Activator.CreateInstance<TEntity>();
foreach (var column in _table.PropertyColumns)
{
if (jsonElement.TryGetProperty(column.ColumnName, out var jsonValue))
{
if (column.IsGenerated)
{
throw new UserException($"Property {column.ColumnName} is auto generated, you cannot set it.");
}
if (column.IsNoUpdate)
{
throw new UserException($"Property {column.ColumnName} is not updatable, you cannot set it.");
}
var valueType = MapJsonValueKindToType(jsonValue, out var value);
if (!valueType.IsAssignableTo(column.ColumnType.DatabaseClrType))
{
throw new UserException($"Property {column.ColumnName} is of wrong type.");
}
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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