USE [RobotInstaller];
GO

SET ANSI_NULLS ON;
SET QUOTED_IDENTIFIER ON;
GO

-- Additive/idempotent migration. Safe to run more than once.
IF OBJECT_ID(N'dbo.Notifications', N'U') IS NULL
BEGIN
    CREATE TABLE dbo.Notifications
    (
        Id UNIQUEIDENTIFIER NOT NULL
            CONSTRAINT PK_Notifications PRIMARY KEY CLUSTERED
            CONSTRAINT DF_Notifications_Id DEFAULT NEWSEQUENTIALID(),
        RecipientUserId UNIQUEIDENTIFIER NOT NULL,
        ActorUserId UNIQUEIDENTIFIER NULL,
        ActorName NVARCHAR(200) NULL,
        BroadcastId UNIQUEIDENTIFIER NULL,
        EventType NVARCHAR(100) NOT NULL,
        Severity NVARCHAR(20) NOT NULL
            CONSTRAINT DF_Notifications_Severity DEFAULT N'info',
        Title NVARCHAR(200) NOT NULL,
        Message NVARCHAR(1000) NOT NULL,
        EntityType NVARCHAR(50) NULL,
        EntityId NVARCHAR(100) NULL,
        ActionUrl NVARCHAR(1000) NULL,
        ReadAt DATETIME2(3) NULL,
        CreatedAt DATETIME2(3) NOT NULL
            CONSTRAINT DF_Notifications_CreatedAt DEFAULT SYSUTCDATETIME(),
        ExpiresAt DATETIME2(3) NULL,
        CONSTRAINT FK_Notifications_RecipientUser
            FOREIGN KEY (RecipientUserId) REFERENCES dbo.Users(Id) ON DELETE CASCADE,
        CONSTRAINT CK_Notifications_Severity
            CHECK (Severity IN (N'info', N'success', N'warning', N'error')),
        CONSTRAINT CK_Notifications_EventType_NotBlank
            CHECK (LEN(LTRIM(RTRIM(EventType))) > 0),
        CONSTRAINT CK_Notifications_Title_NotBlank
            CHECK (LEN(LTRIM(RTRIM(Title))) > 0),
        CONSTRAINT CK_Notifications_Message_NotBlank
            CHECK (LEN(LTRIM(RTRIM(Message))) > 0)
    );
END;
GO

IF NOT EXISTS (
    SELECT 1
    FROM sys.indexes
    WHERE object_id = OBJECT_ID(N'dbo.Notifications')
      AND name = N'IX_Notifications_Recipient_Read_Created'
)
BEGIN
    CREATE INDEX IX_Notifications_Recipient_Read_Created
    ON dbo.Notifications(RecipientUserId, ReadAt, CreatedAt DESC)
    INCLUDE (Severity, Title, ActionUrl, ExpiresAt);
END;
GO

IF NOT EXISTS (
    SELECT 1
    FROM sys.indexes
    WHERE object_id = OBJECT_ID(N'dbo.Notifications')
      AND name = N'IX_Notifications_BroadcastId'
)
BEGIN
    CREATE INDEX IX_Notifications_BroadcastId
    ON dbo.Notifications(BroadcastId)
    WHERE BroadcastId IS NOT NULL;
END;
GO

PRINT N'RobotInstaller notification schema is ready.';
GO