using SharedKernel.Extensions;
using Application.Abstractions.Messaging;
using Microsoft.AspNetCore.Mvc;
using Microsoft.AspNetCore.Mvc.RazorPages;
using System.ComponentModel;
using System.ComponentModel.DataAnnotations;

namespace Admin.Pages.Store.Coupon;

public class EditModel(IMediator mediator) : PageModel
{
    [BindProperty]
    public string? QueryString { get; set; }

    public string GameName { get; private set; } = "";
    public string ProductName { get; private set; } = "";
    public string UsagePolicyText { get; private set; } = "";
    public int GeneratedCount { get; private set; }
    public int UsedCount { get; private set; }
    public int AvailableCount { get; private set; }

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

    public sealed class InputModel
    {
        [Required]
        public int ID { get; set; }

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

        [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; }
    }

    public async Task OnGetAsync(int id, CancellationToken ct)
    {
        var result = await mediator.Send(new GetCoupon.Query(id), ct);

        if (result.IsFailure)
        {
            TempData["ErrorMessages"] = result.Error.Description;
            QueryString = Request.QueryString.ToString();
            return;
        }

        var data = result.Value;
        GameName = data.GameName;
        ProductName = data.ProductName;
        UsagePolicyText = data.UsagePolicy == Domain.Entities.Store.ValueObject.CouponUsagePolicy.SingleUse ? "1회 사용 후 소진" : "재사용 가능";
        GeneratedCount = data.GeneratedCount;
        UsedCount = data.UsedCount;
        AvailableCount = data.AvailableCount;

        Input = new InputModel
        {
            ID = data.ID,
            Name = data.Name,
            ExpiresAt = data.ExpiresAt,
            LowStockThreshold = data.LowStockThreshold
        };

        QueryString = Request.QueryString.ToString();
    }

    public async Task<IActionResult> OnPostAsync(CancellationToken ct)
    {
        if (!ModelState.IsValid)
        {
            TempData["ErrorMessages"] = ModelState.GetErrorMessages();
            return Redirect($"/Store/Coupon/Edit/{Input.ID}{Request.QueryString}");
        }

        var result = await mediator.Send(new UpdateCoupon.Command(
            Input.ID,
            Input.Name,
            Input.ExpiresAt,
            Input.LowStockThreshold
        ), ct);

        if (result.IsFailure)
        {
            TempData["ErrorMessages"] = result.Error.Description;
        }
        else
        {
            TempData["SuccessMessage"] = $"{Input.Name} 쿠폰이 수정되었습니다.";
        }

        return Redirect($"/Store/Coupon/Edit/{Input.ID}{Request.QueryString}");
    }
}