using Microsoft.EntityFrameworkCore.Migrations;

#nullable disable

namespace TafsirQuran.Infrastructure.Persistence.Migrations
{
    /// <inheritdoc />
    public partial class SurahExplicitIds : Migration
    {
        /// <inheritdoc />
        protected override void Up(MigrationBuilder migrationBuilder)
        {
            // SQL Server cannot ALTER IDENTITY off a column; recreate Surahs without identity.
            migrationBuilder.Sql("""
                IF OBJECT_ID(N'[FK_Ayahs_Surahs_SurahId]', N'F') IS NOT NULL
                    ALTER TABLE [Ayahs] DROP CONSTRAINT [FK_Ayahs_Surahs_SurahId];
                IF OBJECT_ID(N'[FK_Episodes_Surahs_SurahId]', N'F') IS NOT NULL
                    ALTER TABLE [Episodes] DROP CONSTRAINT [FK_Episodes_Surahs_SurahId];

                IF OBJECT_ID(N'[Surahs]', N'U') IS NOT NULL
                BEGIN
                    SELECT * INTO [#SurahsBackup] FROM [Surahs];
                    DROP TABLE [Surahs];
                END

                CREATE TABLE [Surahs] (
                    [Id] int NOT NULL,
                    [Number] int NOT NULL,
                    [NameAr] nvarchar(80) NOT NULL,
                    [NameFa] nvarchar(80) NOT NULL,
                    CONSTRAINT [PK_Surahs] PRIMARY KEY ([Id])
                );

                CREATE UNIQUE INDEX [IX_Surahs_Number] ON [Surahs] ([Number]);

                IF OBJECT_ID(N'tempdb..#SurahsBackup') IS NOT NULL
                BEGIN
                    INSERT INTO [Surahs] ([Id], [Number], [NameAr], [NameFa])
                    SELECT [Id], [Number], [NameAr], [NameFa] FROM [#SurahsBackup];
                    DROP TABLE [#SurahsBackup];
                END

                ALTER TABLE [Ayahs] WITH CHECK ADD CONSTRAINT [FK_Ayahs_Surahs_SurahId]
                    FOREIGN KEY ([SurahId]) REFERENCES [Surahs] ([Id]) ON DELETE CASCADE;
                ALTER TABLE [Episodes] WITH CHECK ADD CONSTRAINT [FK_Episodes_Surahs_SurahId]
                    FOREIGN KEY ([SurahId]) REFERENCES [Surahs] ([Id]) ON DELETE CASCADE;
                """);
        }

        /// <inheritdoc />
        protected override void Down(MigrationBuilder migrationBuilder)
        {
            migrationBuilder.Sql("""
                IF OBJECT_ID(N'[FK_Ayahs_Surahs_SurahId]', N'F') IS NOT NULL
                    ALTER TABLE [Ayahs] DROP CONSTRAINT [FK_Ayahs_Surahs_SurahId];
                IF OBJECT_ID(N'[FK_Episodes_Surahs_SurahId]', N'F') IS NOT NULL
                    ALTER TABLE [Episodes] DROP CONSTRAINT [FK_Episodes_Surahs_SurahId];

                IF OBJECT_ID(N'[Surahs]', N'U') IS NOT NULL
                BEGIN
                    SELECT * INTO [#SurahsBackup] FROM [Surahs];
                    DROP TABLE [Surahs];
                END

                CREATE TABLE [Surahs] (
                    [Id] int NOT NULL IDENTITY(1,1),
                    [Number] int NOT NULL,
                    [NameAr] nvarchar(80) NOT NULL,
                    [NameFa] nvarchar(80) NOT NULL,
                    CONSTRAINT [PK_Surahs] PRIMARY KEY ([Id])
                );

                CREATE UNIQUE INDEX [IX_Surahs_Number] ON [Surahs] ([Number]);

                IF OBJECT_ID(N'tempdb..#SurahsBackup') IS NOT NULL
                BEGIN
                    SET IDENTITY_INSERT [Surahs] ON;
                    INSERT INTO [Surahs] ([Id], [Number], [NameAr], [NameFa])
                    SELECT [Id], [Number], [NameAr], [NameFa] FROM [#SurahsBackup];
                    SET IDENTITY_INSERT [Surahs] OFF;
                    DROP TABLE [#SurahsBackup];
                END

                ALTER TABLE [Ayahs] WITH CHECK ADD CONSTRAINT [FK_Ayahs_Surahs_SurahId]
                    FOREIGN KEY ([SurahId]) REFERENCES [Surahs] ([Id]) ON DELETE CASCADE;
                ALTER TABLE [Episodes] WITH CHECK ADD CONSTRAINT [FK_Episodes_Surahs_SurahId]
                    FOREIGN KEY ([SurahId]) REFERENCES [Surahs] ([Id]) ON DELETE CASCADE;
                """);
        }
    }
}