using Domain.Entities.Store.ValueObject;
using SharedKernel.Attributes;
using SharedKernel.Extensions;
using Application.Abstractions.Messaging;
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.Product;

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

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

    public sealed class InputModel
    {
        [DisplayName("게임")]
        public int? GameID { get; set; }

        [DisplayName("상품명")]
        [Required(ErrorMessage = "{0}은(는) 필수입니다.")]
        [StringLength(200, ErrorMessage = "{0}은(는) {1}자 이하로 입력하세요.")]
        public string Name { get; set; } = null!;

        [DisplayName("썸네일")]
        [AllowedExtensions("jpg,jpeg,png,gif,webp", ErrorMessage = "이미지 형식은 jpg, jpeg, png, gif, webp 만 허용합니다.")]
        public IFormFile? ThumbnailFile { get; set; }

        [DisplayName("설명")]
        public string? Description { get; set; }

        [DisplayName("상품 유형")]
        [Required(ErrorMessage = "{0}은(는) 필수입니다.")]
        public ProductType Type { get; set; } = ProductType.Physical;

        [DisplayName("가격(P)")]
        [Required(ErrorMessage = "{0}은(는) 필수입니다.")]
        [Range(0, int.MaxValue, ErrorMessage = "{0}은(는) 0 이상이어야 합니다.")]
        public int Price { get; set; }

        [DisplayName("할인 모드")]
        public DiscountType DiscountType { get; set; } = DiscountType.None;

        [DisplayName("할인 값")]
        [Range(0, int.MaxValue)]
        public int DiscountValue { get; set; }

        [DisplayName("재고 (-1=무제한)")]
        [Range(-1, int.MaxValue, ErrorMessage = "{0}은(는) -1(무제한) 또는 0 이상이어야 합니다.")]
        public int Stock { get; set; } = -1;

        [DisplayName("최소 구매 수량")]
        [Range(1, 999, ErrorMessage = "{0}은(는) {1} 이상 {2} 이하로 입력하세요.")]
        public int MinPurchase { get; set; } = 1;

        [DisplayName("최대 구매 수량")]
        [Range(1, 999, ErrorMessage = "{0}은(는) {1} 이상 {2} 이하로 입력하세요.")]
        public int MaxPurchase { get; set; } = 999;

        [DisplayName("순서")]
        [Range(0, 9999)]
        public int Order { get; set; } = 0;

        [DisplayName("사용 여부")]
        public bool IsActive { get; set; } = true;

        [DisplayName("판매 시작")]
        [DataType(DataType.DateTime)]
        public DateTime? SaleStartAt { get; set; }

        [DisplayName("판매 종료")]
        [DataType(DataType.DateTime)]
        public DateTime? SaleEndAt { get; set; }

        [DisplayName("후원 채널 필수")]
        public bool RequireDonationChannel { get; set; }

        [DisplayName("소모품 종류")]
        public ItemKind? ItemKind { get; set; }

        [DisplayName("소모품 효과 지속일")]
        [Range(0, 3650)]
        public int DurationDays { get; set; }
    }

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

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

        // datetime-local input은 사용자 로컬 시각(Kind=Unspecified). DB는 UTC 저장 규약 → 명시 변환.
        var saleStartUtc = Input.SaleStartAt.HasValue
            ? DateTime.SpecifyKind(Input.SaleStartAt.Value, DateTimeKind.Local).ToUniversalTime()
            : (DateTime?)null;
        var saleEndUtc = Input.SaleEndAt.HasValue
            ? DateTime.SpecifyKind(Input.SaleEndAt.Value, DateTimeKind.Local).ToUniversalTime()
            : (DateTime?)null;

        var result = await mediator.Send(new CreateProduct.Command(
            Input.GameID,
            Input.Name,
            Input.ThumbnailFile,
            Input.Description,
            Input.Type,
            Input.Price,
            Input.DiscountType,
            Input.DiscountValue,
            Input.Stock,
            Input.MinPurchase,
            Input.MaxPurchase,
            Input.Order,
            Input.IsActive,
            saleStartUtc,
            saleEndUtc,
            Input.RequireDonationChannel,
            Input.ItemKind,
            Input.DurationDays
        ), ct);

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

        TempData["SuccessMessage"] = $"{Input.Name} 상품이 등록되었습니다.";
        return RedirectToPage("/Store/Product/Index");
    }

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