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using System.Diagnostics;
using System.Reflection;
using System.Text;
namespace CrupestApi.Commons.Crud;
public class ColumnInfo
{
private readonly AggregateColumnMetadata _metadata = new AggregateColumnMetadata();
private ILogger<ColumnInfo> _logger;
/// <summary>
/// Initialize a column without corresponding property.
/// </summary>
public ColumnInfo(TableInfo table, IColumnMetadata metadata, Type clrType, IColumnTypeProvider typeProvider, ILoggerFactory loggerFactory)
{
_logger = loggerFactory.CreateLogger<ColumnInfo>();
_logger.LogInformation("Create column {} without corresponding property.", ColumnName);
Table = table;
_metadata.Add(metadata);
ColumnType = typeProvider.Get(clrType);
}
/// <summary>
/// Initialize a column with corresponding property.
/// </summary>
public ColumnInfo(TableInfo table, PropertyInfo propertyInfo, IColumnTypeProvider typeProvider, ILoggerFactory loggerFactory)
{
_logger = loggerFactory.CreateLogger<ColumnInfo>();
_logger.LogInformation("Create column {} with corresponding property.", ColumnName);
Table = table;
PropertyInfo = propertyInfo;
ColumnType = typeProvider.Get(propertyInfo.PropertyType);
var columnAttribute = propertyInfo.GetCustomAttribute<ColumnAttribute>();
if (columnAttribute is not null)
{
_metadata.Add(columnAttribute);
}
}
public TableInfo Table { get; }
public Type EntityType => Table.EntityType;
// If null, there is no corresponding property.
public PropertyInfo? PropertyInfo { get; } = null;
public IColumnMetadata Metadata => _metadata;
public IColumnTypeInfo ColumnType { 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 IsGenerated => Metadata.GetValueOrDefault(ColumnMetadataKeys.Generated) is true;
public bool IsNoUpdate => Metadata.GetValueOrDefault(ColumnMetadataKeys.NoUpdate) is true;
public bool CanBeGenerated => (bool?)Metadata.GetValueOrDefault(ColumnMetadataKeys.CanBeGenerated) ?? (DefaultValueGeneratorMethod is not null || IsAutoIncrement);
/// <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;
/// <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;
}
}
public MethodInfo? ValidatorMethod
{
get
{
object? value = Metadata.GetValueOrDefault(ColumnMetadataKeys.DefaultValueGenerator);
Debug.Assert(value is null || value is string);
MethodInfo? result;
if (value is null)
{
string methodName = ColumnName + "Validator";
result = Table.EntityType.GetMethod(methodName, BindingFlags.Static);
}
else
{
string methodName = (string)value;
result = Table.EntityType.GetMethod(methodName, BindingFlags.Static) ?? throw new Exception("The validator does not exist.");
}
return result;
}
}
public void InvokeValidator(object value)
{
ValidatorMethod?.Invoke(null, new object?[] { this, value });
}
public object? InvokeDefaultValueGenerator()
{
return DefaultValueGeneratorMethod?.Invoke(null, new object?[] { this });
}
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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