-- V010_ROLLBACK.sql
-- Reversa de V010__audit_infrastructure.sql.
--
-- ⚠️  ADVERTENCIA: ejecutar este script ELIMINA toda la historia auditada.
--     - dbo.AuditEvent y dbo.SecurityEvent se dropean (junto con datos).
--     - History tables (Usuario_History, Rol_History, Permiso_History, RolPermiso_History) se dropean.
--     - Particionamiento, filegroups y archivos físicos se desmontan.
--
-- Uso intended: ROLLBACK de emergencia en entornos NO-productivos.
-- En prod futuro, este script NO se ejecuta: si hace falta revertir, se hace
-- restore de backup previo a V010.

SET QUOTED_IDENTIFIER ON;
SET ANSI_NULLS ON;
SET NOCOUNT ON;
GO

-- ═══════════════════════════════════════════════════════════════════════
-- 1. Apagar SYSTEM_VERSIONING + remover columnas PERIOD en las 4 tablas
-- ═══════════════════════════════════════════════════════════════════════

-- Usuario
IF EXISTS (SELECT 1 FROM sys.tables WHERE object_id = OBJECT_ID('dbo.Usuario') AND temporal_type = 2)
BEGIN
    ALTER TABLE dbo.Usuario SET (SYSTEM_VERSIONING = OFF);
    PRINT 'Usuario: SYSTEM_VERSIONING OFF.';
END
GO

IF EXISTS (SELECT 1 FROM sys.periods WHERE object_id = OBJECT_ID('dbo.Usuario'))
BEGIN
    ALTER TABLE dbo.Usuario DROP PERIOD FOR SYSTEM_TIME;
    PRINT 'Usuario: PERIOD FOR SYSTEM_TIME dropped.';
END
GO

IF COL_LENGTH('dbo.Usuario', 'ValidFrom') IS NOT NULL
BEGIN
    ALTER TABLE dbo.Usuario DROP CONSTRAINT IF EXISTS DF_Usuario_ValidFrom;
    ALTER TABLE dbo.Usuario DROP CONSTRAINT IF EXISTS DF_Usuario_ValidTo;
    ALTER TABLE dbo.Usuario DROP COLUMN ValidFrom, ValidTo;
    PRINT 'Usuario: ValidFrom/ValidTo dropped.';
END
GO

IF OBJECT_ID(N'dbo.Usuario_History', N'U') IS NOT NULL
BEGIN
    DROP TABLE dbo.Usuario_History;
    PRINT 'Usuario_History dropped.';
END
GO

-- Rol
IF EXISTS (SELECT 1 FROM sys.tables WHERE object_id = OBJECT_ID('dbo.Rol') AND temporal_type = 2)
    ALTER TABLE dbo.Rol SET (SYSTEM_VERSIONING = OFF);
GO

IF EXISTS (SELECT 1 FROM sys.periods WHERE object_id = OBJECT_ID('dbo.Rol'))
    ALTER TABLE dbo.Rol DROP PERIOD FOR SYSTEM_TIME;
GO

IF COL_LENGTH('dbo.Rol', 'ValidFrom') IS NOT NULL
BEGIN
    ALTER TABLE dbo.Rol DROP CONSTRAINT IF EXISTS DF_Rol_ValidFrom;
    ALTER TABLE dbo.Rol DROP CONSTRAINT IF EXISTS DF_Rol_ValidTo;
    ALTER TABLE dbo.Rol DROP COLUMN ValidFrom, ValidTo;
END
GO

IF OBJECT_ID(N'dbo.Rol_History', N'U') IS NOT NULL DROP TABLE dbo.Rol_History;
GO

-- Permiso
IF EXISTS (SELECT 1 FROM sys.tables WHERE object_id = OBJECT_ID('dbo.Permiso') AND temporal_type = 2)
    ALTER TABLE dbo.Permiso SET (SYSTEM_VERSIONING = OFF);
GO

IF EXISTS (SELECT 1 FROM sys.periods WHERE object_id = OBJECT_ID('dbo.Permiso'))
    ALTER TABLE dbo.Permiso DROP PERIOD FOR SYSTEM_TIME;
GO

IF COL_LENGTH('dbo.Permiso', 'ValidFrom') IS NOT NULL
BEGIN
    ALTER TABLE dbo.Permiso DROP CONSTRAINT IF EXISTS DF_Permiso_ValidFrom;
    ALTER TABLE dbo.Permiso DROP CONSTRAINT IF EXISTS DF_Permiso_ValidTo;
    ALTER TABLE dbo.Permiso DROP COLUMN ValidFrom, ValidTo;
END
GO

IF OBJECT_ID(N'dbo.Permiso_History', N'U') IS NOT NULL DROP TABLE dbo.Permiso_History;
GO

-- RolPermiso
IF EXISTS (SELECT 1 FROM sys.tables WHERE object_id = OBJECT_ID('dbo.RolPermiso') AND temporal_type = 2)
    ALTER TABLE dbo.RolPermiso SET (SYSTEM_VERSIONING = OFF);
GO

IF EXISTS (SELECT 1 FROM sys.periods WHERE object_id = OBJECT_ID('dbo.RolPermiso'))
    ALTER TABLE dbo.RolPermiso DROP PERIOD FOR SYSTEM_TIME;
GO

IF COL_LENGTH('dbo.RolPermiso', 'ValidFrom') IS NOT NULL
BEGIN
    ALTER TABLE dbo.RolPermiso DROP CONSTRAINT IF EXISTS DF_RolPermiso_ValidFrom;
    ALTER TABLE dbo.RolPermiso DROP CONSTRAINT IF EXISTS DF_RolPermiso_ValidTo;
    ALTER TABLE dbo.RolPermiso DROP COLUMN ValidFrom, ValidTo;
END
GO

IF OBJECT_ID(N'dbo.RolPermiso_History', N'U') IS NOT NULL DROP TABLE dbo.RolPermiso_History;
GO

-- ═══════════════════════════════════════════════════════════════════════
-- 2. Drop AuditEvent + SecurityEvent
-- ═══════════════════════════════════════════════════════════════════════

IF OBJECT_ID(N'dbo.AuditEvent', N'U') IS NOT NULL
BEGIN
    DROP TABLE dbo.AuditEvent;
    PRINT 'Table dbo.AuditEvent dropped.';
END
GO

IF OBJECT_ID(N'dbo.SecurityEvent', N'U') IS NOT NULL
BEGIN
    DROP TABLE dbo.SecurityEvent;
    PRINT 'Table dbo.SecurityEvent dropped.';
END
GO

-- ═══════════════════════════════════════════════════════════════════════
-- 3. Drop partition schemes + functions
-- ═══════════════════════════════════════════════════════════════════════

IF EXISTS (SELECT 1 FROM sys.partition_schemes WHERE name = 'ps_AuditEvent_Monthly')
    DROP PARTITION SCHEME ps_AuditEvent_Monthly;
GO

IF EXISTS (SELECT 1 FROM sys.partition_functions WHERE name = 'pf_AuditEvent_Monthly')
    DROP PARTITION FUNCTION pf_AuditEvent_Monthly;
GO

IF EXISTS (SELECT 1 FROM sys.partition_schemes WHERE name = 'ps_SecurityEvent_Monthly')
    DROP PARTITION SCHEME ps_SecurityEvent_Monthly;
GO

IF EXISTS (SELECT 1 FROM sys.partition_functions WHERE name = 'pf_SecurityEvent_Monthly')
    DROP PARTITION FUNCTION pf_SecurityEvent_Monthly;
GO

-- ═══════════════════════════════════════════════════════════════════════
-- 4. Remover archivos físicos y filegroups
-- ═══════════════════════════════════════════════════════════════════════

DECLARE @dbName       NVARCHAR(128) = DB_NAME();
DECLARE @hotLogical   NVARCHAR(128) = @dbName + N'_AUDIT_HOT';
DECLARE @coldLogical  NVARCHAR(128) = @dbName + N'_AUDIT_COLD';
DECLARE @sql          NVARCHAR(MAX);

IF EXISTS (SELECT 1 FROM sys.database_files WHERE name = @hotLogical)
BEGIN
    SET @sql = N'ALTER DATABASE CURRENT REMOVE FILE [' + @hotLogical + N'];';
    EXEC sp_executesql @sql;
    PRINT 'File ' + @hotLogical + ' removed.';
END

IF EXISTS (SELECT 1 FROM sys.database_files WHERE name = @coldLogical)
BEGIN
    SET @sql = N'ALTER DATABASE CURRENT REMOVE FILE [' + @coldLogical + N'];';
    EXEC sp_executesql @sql;
    PRINT 'File ' + @coldLogical + ' removed.';
END

IF EXISTS (SELECT 1 FROM sys.filegroups WHERE name = 'AUDIT_HOT')
    EXEC sp_executesql N'ALTER DATABASE CURRENT REMOVE FILEGROUP AUDIT_HOT;';

IF EXISTS (SELECT 1 FROM sys.filegroups WHERE name = 'AUDIT_COLD')
    EXEC sp_executesql N'ALTER DATABASE CURRENT REMOVE FILEGROUP AUDIT_COLD;';
GO

PRINT '';
PRINT 'V010 rolled back. Audit infrastructure removed. All audit history is permanently LOST.';
GO