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using System.Diagnostics;
using System.Reflection;
using System.Text;
namespace CrupestApi.Commons.Crud;
public class ColumnHooks
{
public delegate void ColumnHookAction(ColumnInfo column, ref object? value, bool specified);
public ColumnHooks(ColumnHookAction afterSelect, ColumnHookAction beforeInsert, ColumnHookAction beforeUpdate)
{
AfterSelect = afterSelect;
BeforeInsert = beforeInsert;
BeforeUpdate = beforeUpdate;
}
/// <summary>Called after SELECT. Please use multicast if you want to customize it because there are many default behavior in it.</summary
public ColumnHookAction AfterSelect;
/// <summary>Called before INSERT. Please use multicast if you want to customize it because there are many default behavior in it.</summary>
public ColumnHookAction BeforeInsert;
/// <summary>Called before UPDATE. Please use multicast if you want to customize it because there are many default behavior in it.</summary
/// <remarks>Set value to null to delete the update item so it will not change. Set value to <see cref="DbNullValue"/> to update the column to NULL.</remarks>
public ColumnHookAction BeforeUpdate;
}
public class ColumnInfo
{
private readonly AggregateColumnMetadata _metadata = new AggregateColumnMetadata();
/// <summary>
/// Initialize a column without corresponding property.
/// </summary>
public ColumnInfo(TableInfo table, IColumnMetadata metadata, Type clrType, IColumnTypeProvider typeProvider)
{
Table = table;
_metadata.Add(metadata);
ColumnType = typeProvider.Get(clrType);
Hooks = new ColumnHooks(
new ColumnHooks.ColumnHookAction(OnAfterSelect),
new ColumnHooks.ColumnHookAction(OnBeforeInsert),
new ColumnHooks.ColumnHookAction(OnBeforeUpdate)
);
}
/// <summary>
/// Initialize a column with corresponding property.
/// </summary>
public ColumnInfo(TableInfo table, PropertyInfo propertyInfo, IColumnTypeProvider typeProvider)
{
Table = table;
PropertyInfo = propertyInfo;
ColumnType = typeProvider.Get(propertyInfo.PropertyType);
var columnAttribute = propertyInfo.GetCustomAttribute<ColumnAttribute>();
if (columnAttribute is not null)
{
_metadata.Add(columnAttribute);
}
Hooks = new ColumnHooks(
new ColumnHooks.ColumnHookAction(OnAfterSelect),
new ColumnHooks.ColumnHookAction(OnBeforeInsert),
new ColumnHooks.ColumnHookAction(OnBeforeUpdate)
);
}
public TableInfo Table { get; }
// If null, there is no corresponding property.
public PropertyInfo? PropertyInfo { get; } = null;
public IColumnMetadata Metadata => _metadata;
public IColumnTypeInfo ColumnType { get; }
public ColumnHooks Hooks { get; }
public bool IsPrimaryKey => Metadata.GetValueOrDefault(ColumnMetadataKeys.IsPrimaryKey) is true;
public bool IsAutoIncrement => Metadata.GetValueOrDefault(ColumnMetadataKeys.IsAutoIncrement) is true;
public bool IsNotNull => IsPrimaryKey || Metadata.GetValueOrDefault(ColumnMetadataKeys.NotNull) is true;
public bool IsClientGenerate => Metadata.GetValueOrDefault(ColumnMetadataKeys.ClientGenerate) is true;
public bool IsNoUpdate => Metadata.GetValueOrDefault(ColumnMetadataKeys.NoUpdate) is true;
/// <summary>
/// This only returns metadata value. It doesn't not fall back to primary column. If you want to get the real key column, go to table info.
/// </summary>
/// <seealso cref="ColumnMetadataKeys.ActAsKey"/>
/// <seealso cref="TableInfo.KeyColumn"/>
public bool IsSpecifiedAsKey => Metadata.GetValueOrDefault(ColumnMetadataKeys.ActAsKey) is true;
public ColumnIndexType Index => Metadata.GetValueOrDefault<ColumnIndexType?>(ColumnMetadataKeys.Index) ?? ColumnIndexType.None;
public UpdateBehavior UpdateBehavior => Metadata.GetValueOrDefault<UpdateBehavior?>(ColumnMetadataKeys.UpdateBehavior) ?? UpdateBehavior.NullIsNotUpdate;
/// <summary>
/// The real column name. Maybe set in metadata or just the property name.
/// </summary>
/// <value></value>
public string ColumnName
{
get
{
object? value = Metadata.GetValueOrDefault(ColumnMetadataKeys.ColumnName);
Debug.Assert(value is null || value is string);
return ((string?)value ?? PropertyInfo?.Name) ?? throw new Exception("Failed to get column name.");
}
}
public MethodInfo? DefaultValueGeneratorMethod
{
get
{
object? value = Metadata.GetValueOrDefault(ColumnMetadataKeys.DefaultValueGenerator);
Debug.Assert(value is null || value is string);
MethodInfo? result;
if (value is null)
{
string methodName = ColumnName + "DefaultValueGenerator";
result = Table.EntityType.GetMethod(methodName, BindingFlags.Static);
}
else
{
string methodName = (string)value;
result = Table.EntityType.GetMethod(methodName, BindingFlags.Static) ?? throw new Exception("The default value generator does not exist.");
}
return result;
}
}
private void TryCoerceStringFromNullToEmpty(ref object? value)
{
if (ColumnType.ClrType == typeof(string) && (Metadata.GetValueOrDefault<bool?>(ColumnMetadataKeys.DefaultEmptyForString) is true) && (value is null || value is DbNullValue))
{
value = "";
}
}
protected void OnAfterSelect(ColumnInfo column, ref object? value, bool specified)
{
TryCoerceStringFromNullToEmpty(ref value);
}
protected void OnBeforeInsert(ColumnInfo column, ref object? value, bool specified)
{
if (column.IsClientGenerate && value is not null)
{
throw new UserException($"'{column.ColumnName}' can't be set manually. It is auto generated.");
}
DefaultValueGeneratorMethod?.Invoke(null, new object[] { });
OnBeforeSet(column, ref value);
}
protected void OnBeforeUpdate(ColumnInfo column, ref object? value, bool specified)
{
if (column.IsNoUpdate)
{
throw new UserException($"'{column.ColumnName}' is not updatable.");
}
OnBeforeSet(column, ref value);
}
protected void OnBeforeSet(ColumnInfo column, ref object? value)
{
TryCoerceStringFromNullToEmpty(ref value);
if ((value is null || value is DbNullValue) && column.IsNotNull)
{
throw new UserException($"{column.ColumnName} can't be null.");
}
}
public string GenerateCreateTableColumnString(string? dbProviderId = null)
{
StringBuilder result = new StringBuilder();
result.Append(ColumnName);
result.Append(' ');
result.Append(ColumnType.GetSqlTypeString(dbProviderId));
if (IsPrimaryKey)
{
result.Append(' ');
result.Append("PRIMARY KEY");
}
else if (IsNotNull)
{
result.Append(' ');
result.Append(" NOT NULL");
}
if (IsAutoIncrement)
{
result.Append(' ');
result.Append("AUTOINCREMENT");
}
return result.ToString();
}
}
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