dramaling-vocab-learning/backend/DramaLing.Api/Migrations/20250930155857_AddEnglishLevelNumeric.cs

using Microsoft.EntityFrameworkCore.Migrations;

#nullable disable

namespace DramaLing.Api.Migrations
{
    /// <inheritdoc />
    public partial class AddEnglishLevelNumeric : Migration
    {
        /// <inheritdoc />
        protected override void Up(MigrationBuilder migrationBuilder)
        {
            migrationBuilder.AddColumn<int>(
                name: "english_level_numeric",
                table: "user_profiles",
                type: "INTEGER",
                nullable: false,
                defaultValue: 2);

            // 轉換現有資料：將字串格式的 english_level 轉換為數字格式
            migrationBuilder.Sql(@"
                UPDATE user_profiles
                SET english_level_numeric =
                    CASE english_level
                        WHEN 'A1' THEN 1
                        WHEN 'A2' THEN 2
                        WHEN 'B1' THEN 3
                        WHEN 'B2' THEN 4
                        WHEN 'C1' THEN 5
                        WHEN 'C2' THEN 6
                        ELSE 2 -- 預設 A2
                    END
            ");
        }

        /// <inheritdoc />
        protected override void Down(MigrationBuilder migrationBuilder)
        {
            migrationBuilder.DropColumn(
                name: "english_level_numeric",
                table: "user_profiles");
        }
    }
}