using Microsoft.EntityFrameworkCore.Migrations;

#nullable disable

namespace Projection.ReadModel.Migrations
{
    /// <summary>
    /// S-19b-2 (ADR-0030): the notification log stops describing ZGW zaak events and starts holding
    /// the projected register row itself (register id, status, reference).
    /// </summary>
    /// <remarks>
    /// The old columns are dropped and the new ones added rather than renamed. EF scaffolded renames
    /// (<c>resource</c> → <c>register_id</c>, <c>zaak_id</c> → <c>status</c>), which would carry ZGW
    /// values into columns that mean something else entirely — "zaak"/"status" as a register id, a
    /// zaak uuid as a register status — and a rebuild would then project that garbage.
    ///
    /// Both tables are emptied instead. A pre-existing row describes a zaak event the new projector
    /// cannot reproject, and the registrations behind those rows have no RegisterRecord in Objecten
    /// (only approvals wrote one before this slice), so they are not re-derivable from the new source
    /// either. The projection is a derived artefact (§8.4) and repopulates as register writes arrive.
    /// </remarks>
    public partial class ProjectionSourcedFromObjecten : Migration
    {
        /// <inheritdoc />
        protected override void Up(MigrationBuilder migrationBuilder)
        {
            // ponytail: drops the pre-slice register rather than backfilling it. Fine while stacks are
            // ephemeral (a fresh `docker compose up` is the norm). If a long-lived environment ever
            // needs to keep them, backfill by walking Objecten's objects instead of replaying the log.
            migrationBuilder.Sql("DELETE FROM processed_notifications;");
            migrationBuilder.Sql("DELETE FROM register_projection;");

            migrationBuilder.DropColumn(name: "actie", table: "processed_notifications");
            migrationBuilder.DropColumn(name: "zaak_id", table: "processed_notifications");
            migrationBuilder.DropColumn(name: "resource", table: "processed_notifications");

            migrationBuilder.AddColumn<string>(
                name: "register_id",
                table: "processed_notifications",
                type: "text",
                nullable: false,
                defaultValue: "");

            migrationBuilder.AddColumn<string>(
                name: "status",
                table: "processed_notifications",
                type: "text",
                nullable: false,
                defaultValue: "");
        }

        /// <inheritdoc />
        protected override void Down(MigrationBuilder migrationBuilder)
        {
            migrationBuilder.Sql("DELETE FROM processed_notifications;");
            migrationBuilder.Sql("DELETE FROM register_projection;");

            migrationBuilder.DropColumn(name: "register_id", table: "processed_notifications");
            migrationBuilder.DropColumn(name: "status", table: "processed_notifications");

            migrationBuilder.AddColumn<string>(
                name: "actie", table: "processed_notifications", type: "text", nullable: false, defaultValue: "");
            migrationBuilder.AddColumn<string>(
                name: "zaak_id", table: "processed_notifications", type: "text", nullable: false, defaultValue: "");
            migrationBuilder.AddColumn<string>(
                name: "resource", table: "processed_notifications", type: "text", nullable: false, defaultValue: "");
        }
    }
}