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.Shipment;

public class DetailModel(IMediator mediator) : PageModel
{
    public GetShipment.Response? Data { get; private set; }

    [BindProperty(SupportsGet = true)]
    public bool WithAddress { get; set; }

    [BindProperty]
    public TrackingInput Tracking { get; set; } = new();

    public sealed class TrackingInput
    {
        [DisplayName("택배사")]
        [Required(ErrorMessage = "{0}은(는) 필수입니다.")]
        [StringLength(50)]
        public string Carrier { get; set; } = null!;

        [DisplayName("송장번호")]
        [Required(ErrorMessage = "{0}은(는) 필수입니다.")]
        [StringLength(50)]
        public string TrackingNumber { get; set; } = null!;
    }

    [BindProperty]
    public BillingInput Billing { get; set; } = new();

    public sealed class BillingInput
    {
        [DisplayName("배송비")]
        [Range(0, int.MaxValue, ErrorMessage = "{0}은(는) 0 이상이어야 합니다.")]
        public int ShippingFee { get; set; }

        [DisplayName("관리자 메모")]
        [StringLength(500, ErrorMessage = "{0}은(는) 최대 {1}자까지 입력 가능합니다.")]
        public string? AdminMemo { get; set; }
    }

    public async Task OnGetAsync(int id, CancellationToken ct)
    {
        await LoadAsync(id, ct);
    }

    public async Task<IActionResult> OnPostRegisterTrackingAsync(int id, CancellationToken ct)
    {
        if (!ModelState.IsValid)
        {
            TempData["ErrorMessages"] = ModelState.GetErrorMessages();
            return RedirectToPage("/Store/Shipment/Detail", new { id });
        }

        var result = await mediator.Send(new UpdateShipmentStatus.Command(
            id, "RegisterTracking", Tracking.Carrier, Tracking.TrackingNumber
        ), ct);

        if (result.IsFailure)
        {
            TempData["ErrorMessages"] = result.Error.Description;
        }
        else
        {
            TempData["SuccessMessage"] = "송장이 등록되었습니다.";
        }

        return RedirectToPage("/Store/Shipment/Detail", new { id });
    }

    public async Task<IActionResult> OnPostTransitAsync(int id, CancellationToken ct)
    {
        var result = await mediator.Send(new UpdateShipmentStatus.Command(id, "InTransit"), ct);

        TempData[result.IsFailure ? "ErrorMessages" : "SuccessMessage"] =
            result.IsFailure ? result.Error.Description : "배송중으로 전환되었습니다.";

        return RedirectToPage("/Store/Shipment/Detail", new { id });
    }

    public async Task<IActionResult> OnPostDeliveredAsync(int id, CancellationToken ct)
    {
        var result = await mediator.Send(new UpdateShipmentStatus.Command(id, "Delivered"), ct);

        TempData[result.IsFailure ? "ErrorMessages" : "SuccessMessage"] =
            result.IsFailure ? result.Error.Description : "배송완료로 전환되었습니다.";

        return RedirectToPage("/Store/Shipment/Detail", new { id });
    }

    public async Task<IActionResult> OnPostFailedAsync(int id, CancellationToken ct)
    {
        var result = await mediator.Send(new UpdateShipmentStatus.Command(id, "Failed"), ct);

        TempData[result.IsFailure ? "ErrorMessages" : "SuccessMessage"] =
            result.IsFailure ? result.Error.Description : "배송실패로 표시되었습니다.";

        return RedirectToPage("/Store/Shipment/Detail", new { id });
    }

    public async Task<IActionResult> OnPostUpdateBillingAsync(int id, CancellationToken ct)
    {
        if (!ModelState.IsValid)
        {
            TempData["ErrorMessages"] = ModelState.GetErrorMessages();
            return RedirectToPage("/Store/Shipment/Detail", new { id });
        }

        var result = await mediator.Send(new UpdateShipmentStatus.Command(
            id, "UpdateBilling",
            ShippingFee: Billing.ShippingFee,
            AdminMemo: Billing.AdminMemo
        ), ct);

        TempData[result.IsFailure ? "ErrorMessages" : "SuccessMessage"] =
            result.IsFailure ? result.Error.Description : "배송비/메모가 저장되었습니다.";

        return RedirectToPage("/Store/Shipment/Detail", new { id });
    }

    private async Task LoadAsync(int id, CancellationToken ct)
    {
        // 1차에는 모든 관리자가 주소 조회 가능 (S5에서는 권한 분리 미적용)
        // 실제 운영에서는 Member.IsAdmin 또는 별도 "Store.ViewAddress" 권한 검증 필요
        var result = await mediator.Send(new GetShipment.Query(id, WithAddress: WithAddress), ct);

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

        Data = result.Value;

        // Billing 폼 기본값을 현재 값으로 채우기
        Billing.ShippingFee = Data.ShippingFee;
        Billing.AdminMemo = Data.AdminMemo;
    }
}