using Microsoft.EntityFrameworkCore.Migrations;
using Npgsql.EntityFrameworkCore.PostgreSQL.Metadata;

#nullable disable

namespace Tnsu.ApprovalRoute.Infrastructure.Persistence.Migrations
{
    /// <inheritdoc />
    public partial class AddMultipleStepConditions : Migration
    {
        /// <inheritdoc />
        protected override void Up(MigrationBuilder migrationBuilder)
        {
            migrationBuilder.AddColumn<string>(
                name: "conditions_logic",
                table: "template_route_steps",
                type: "character varying(16)",
                maxLength: 16,
                nullable: false,
                defaultValue: "And");

            migrationBuilder.CreateTable(
                name: "template_route_step_conditions",
                columns: table => new
                {
                    id = table.Column<int>(type: "integer", nullable: false)
                        .Annotation("Npgsql:ValueGenerationStrategy", NpgsqlValueGenerationStrategy.IdentityByDefaultColumn),
                    step_id = table.Column<int>(type: "integer", nullable: false),
                    order_no = table.Column<int>(type: "integer", nullable: false),
                    field_name = table.Column<string>(type: "character varying(128)", maxLength: 128, nullable: false),
                    operation = table.Column<string>(type: "character varying(32)", maxLength: 32, nullable: false),
                    value = table.Column<string>(type: "character varying(256)", maxLength: 256, nullable: false)
                },
                constraints: table =>
                {
                    table.PrimaryKey("pk_template_route_step_conditions", x => x.id);
                    table.ForeignKey(
                        name: "fk_template_route_step_conditions_template_route_steps_step_id",
                        column: x => x.step_id,
                        principalTable: "template_route_steps",
                        principalColumn: "id",
                        onDelete: ReferentialAction.Cascade);
                });

            migrationBuilder.CreateIndex(
                name: "ix_template_route_step_conditions_step_id_order_no",
                table: "template_route_step_conditions",
                columns: new[] { "step_id", "order_no" });

            // Существующее одиночное условие шага (field_name/operation/value) переносим
            // как первое (и единственное) условие в новую таблицу — до удаления старых
            // колонок, иначе уже настроенные в деве/проде условия шагов молча пропадут.
            migrationBuilder.Sql(
                """
                INSERT INTO template_route_step_conditions (step_id, order_no, field_name, operation, value)
                SELECT id, 0, field_name, operation, value
                FROM template_route_steps
                WHERE field_name IS NOT NULL AND operation IS NOT NULL AND value IS NOT NULL;
                """);

            migrationBuilder.DropColumn(
                name: "field_name",
                table: "template_route_steps");

            migrationBuilder.DropColumn(
                name: "operation",
                table: "template_route_steps");

            migrationBuilder.DropColumn(
                name: "value",
                table: "template_route_steps");
        }

        /// <inheritdoc />
        protected override void Down(MigrationBuilder migrationBuilder)
        {
            migrationBuilder.AddColumn<string>(
                name: "field_name",
                table: "template_route_steps",
                type: "character varying(128)",
                maxLength: 128,
                nullable: true);

            migrationBuilder.AddColumn<string>(
                name: "operation",
                table: "template_route_steps",
                type: "character varying(32)",
                maxLength: 32,
                nullable: true);

            migrationBuilder.AddColumn<string>(
                name: "value",
                table: "template_route_steps",
                type: "character varying(256)",
                maxLength: 256,
                nullable: true);

            // Откат теряет условия сверх первого (по order_no) — старая схема хранила
            // только одно условие на шаг, второе и далее девать некуда.
            migrationBuilder.Sql(
                """
                UPDATE template_route_steps s
                SET field_name = c.field_name, operation = c.operation, value = c.value
                FROM (
                    SELECT DISTINCT ON (step_id) step_id, field_name, operation, value
                    FROM template_route_step_conditions
                    ORDER BY step_id, order_no
                ) c
                WHERE c.step_id = s.id;
                """);

            migrationBuilder.DropTable(
                name: "template_route_step_conditions");

            migrationBuilder.DropColumn(
                name: "conditions_logic",
                table: "template_route_steps");
        }
    }
}