using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using AyCode.Core.Consts;

namespace FruitBank.Common.Server
{
    public class FruitBankConst : AcConst
    {
        public static string ProjectIdString = "aad53443-2ee2-4650-8a99-97e907265e4e";

        public static string MeasuringRoleSystemName = "Measuring";
        public static string MeasuringRevisorRoleSystemName = "MeasuringRevisor";
        public static string IsMeasureableAttributeName = "IsMeasurable";

        /// <summary>
        /// DateTime generic attribute on Product.
        /// The start of the window during which this product is visible for preordering.
        /// </summary>
        public const string PreOrderWindowStart = "PreOrderWindowStart";

        /// <summary>
        /// DateTime generic attribute on Product.
        /// The end of the window during which this product is visible for preordering.
        /// </summary>
        public const string PreOrderWindowEnd = "PreOrderWindowEnd";

        // ── Environment flag — method-only surface on purpose: no property to bind/serialize/read accidentally ──

        private static bool? _isProd;

        /// <summary>
        /// Set once by the plugin startup after DB-catalog classification.
        /// A second call with a different value throws — the flag cannot flip at runtime.
        /// </summary>
        public static void SetIsProd(bool isProd)
        {
            if (_isProd.HasValue && _isProd.Value != isProd)
                throw new InvalidOperationException(
                    $"IsProd is already set to {_isProd.Value}; refusing to change it to {isProd}.");

            _isProd = isProd;
        }

        /// <summary>
        /// True = PROD database. Throws until SetIsProd ran — an uninitialized read must never return a default.
        /// </summary>
        public static bool IsProd()
            => _isProd ?? throw new InvalidOperationException(
                "IsProd has not been initialized — SetIsProd must run at startup before any read.");

        static FruitBankConst()
        {
            ProjectId = Guid.Parse(ProjectIdString);
            ProjectSalt = GenerateProjectSalt(ProjectId.ToString("N"));
        }
    }

}