ANTOOZA-BACKEND/Admin/Pages/Store/Coupon/Write.cshtml.cs

using Domain.Entities.Store.ValueObject;
using SharedKernel.Extensions;
using MediatR;
using Microsoft.AspNetCore.Mvc;
using Microsoft.AspNetCore.Mvc.RazorPages;
using Microsoft.AspNetCore.Mvc.Rendering;
using System.ComponentModel;
using System.ComponentModel.DataAnnotations;

namespace Admin.Pages.Store.Coupon;

public class WriteModel(IMediator mediator) : PageModel
{
    public List<SelectListItem> Games { get; set; } = [];

    public List<(int ID, int GameID, string Name)> Products { get; set; } = [];

    [BindProperty]
    public InputModel Input { get; set; } = new();

    public sealed class InputModel
    {
        [DisplayName("게임")]
        [Required(ErrorMessage = "{0}을(를) 선택하세요.")]
        [Range(1, int.MaxValue, ErrorMessage = "게임을 선택해 주세요.")]
        public int GameID { get; set; }

        [DisplayName("무형 상품")]
        [Required(ErrorMessage = "{0}을(를) 선택하세요.")]
        [Range(1, int.MaxValue, ErrorMessage = "상품을 선택해 주세요.")]
        public int ProductID { get; set; }

        [DisplayName("쿠폰명")]
        [Required(ErrorMessage = "{0}은(는) 필수입니다.")]
        [StringLength(200)]
        public string Name { get; set; } = null!;

        [DisplayName("사용 정책")]
        public CouponUsagePolicy UsagePolicy { get; set; } = CouponUsagePolicy.SingleUse;

        [DisplayName("만료 일시")]
        [DataType(DataType.DateTime)]
        public DateTime? ExpiresAt { get; set; }

        [DisplayName("재고 부족 알림 임계치")]
        [Range(0, int.MaxValue)]
        public int LowStockThreshold { get; set; } = 10;
    }

    public async Task OnGetAsync(CancellationToken ct)
    {
        await LoadDataAsync(ct);
    }

    public async Task<IActionResult> OnPostAsync(CancellationToken ct)
    {
        if (!ModelState.IsValid)
        {
            TempData["ErrorMessages"] = ModelState.GetErrorMessages();
            await LoadDataAsync(ct);
            return Page();
        }

        var result = await mediator.Send(new CreateCoupon.Command(
            Input.ProductID,
            Input.GameID,
            Input.Name,
            Input.UsagePolicy,
            Input.ExpiresAt,
            Input.LowStockThreshold
        ), ct);

        if (result.IsFailure)
        {
            TempData["ErrorMessages"] = result.Error.Description;
            await LoadDataAsync(ct);
            return Page();
        }

        TempData["SuccessMessage"] = $"{Input.Name} 쿠폰이 등록되었습니다. 코드 풀에서 CSV 업로드 진행하세요.";
        return RedirectToPage("/Store/Coupon/Codes", new { id = result.Value });
    }

    private async Task LoadDataAsync(CancellationToken ct)
    {
        var gamesResult = await mediator.Send(new GetGames.Query(true), ct);
        Games = [.. gamesResult.List.Select(g => new SelectListItem
        {
            Value = g.ID.ToString(),
            Text = $"{g.KorName} ({g.Publisher})"
        })];

        // 무형 상품만 (Coupon 은 무형 상품에 발급)
        var productsResult = await mediator.Send(new SearchProducts.Query(null, null, null, null, null, ProductType.Digital, true, 1, 1000), ct);
        Products = [.. productsResult.List.Select(p => (p.ID, p.GameID, p.Name))];
    }
}