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using System;
using System.Collections.Generic;
using System.ComponentModel.DataAnnotations;
using System.ComponentModel.DataAnnotations.Schema;
using System.Data.Entity;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using Tango.Core;
namespace Tango.BL
{
/// <summary>
/// Represents an observable database entity.
/// </summary>
public interface IObservableEntity : IParameterized
{
/// <summary>
/// Occurs after this observable has been saved.
/// </summary>
event EventHandler Saved;
/// <summary>
/// Gets or sets the entity identifier.
/// </summary>
[Column("ID")]
[DatabaseGeneratedAttribute(DatabaseGeneratedOption.Identity)]
[ParameterIgnore]
Int32 ID { get; set; }
/// <summary>
/// Gets or sets the entity unique identifier.
/// </summary>
[Key]
[Column("GUID")]
[ParameterIgnore]
String Guid { get; set; }
/// <summary>
/// Gets or sets the entity last updated data and time.
/// </summary>
[Column("LAST_UPDATED")]
[ParameterIgnore]
DateTime LastUpdated { get; set; }
/// <summary>
/// Saves the changes on this entity to database.
/// </summary>
void Save(ObservablesContext context);
/// <summary>
/// Attaches this observable to the proper DbSet.
/// </summary>
void Attach(ObservablesContext context);
/// <summary>
/// Detaches this observable from the proper DbSet.
/// </summary>
void Detach(ObservablesContext context);
/// <summary>
/// Saves the changes on this entity to database asynchronously.
/// </summary>
/// <returns></returns>
Task SaveAsync(ObservablesContext context);
/// <summary>
/// Deletes this entity from the database.
/// </summary>
void Delete(ObservablesContext context);
/// <summary>
/// Deletes this entity without saving changes to data base.
/// </summary>
void DefferedDelete(ObservablesContext context);
/// <summary>
/// Deletes this entity from the database.
/// </summary>
Task DeleteAsync(ObservablesContext context);
/// <summary>
/// Deletes this entity using an SQL statement which will cause the database delete cascade effect.
/// </summary>
Task DeleteCascadeAsync(ObservablesContext context);
/// <summary>
/// Performs entity field validation.
/// Will throw an exception with the proper message if one of the fields is invalid.
/// </summary>
/// <param name="context">The context.</param>
void Validate(ObservablesContext context);
/// <summary>
/// Gets the database set containing this entity.
/// </summary>
/// <typeparam name="T"></typeparam>
/// <param name="context">The context.</param>
/// <returns></returns>
DbSet<T> GetDbSet<T>(ObservablesContext context) where T : class, IObservableEntity;
}
}
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