using Domain.Entities.Store.ValueObject;
using SharedKernel.Extensions;
using Application.Abstractions.Messaging;
using Microsoft.AspNetCore.Identity;
using Microsoft.AspNetCore.Mvc;
using Microsoft.AspNetCore.Mvc.RazorPages;
using Infrastructure.Persistence.Identity;
using System.ComponentModel;
using System.ComponentModel.DataAnnotations;
using Application.Features.Admin.Store.Order.RequestCouponsRefund;

namespace Admin.Pages.Store.Order;

public class DetailModel(IMediator mediator, UserManager<ApplicationUser> userManager) : PageModel
{
    public GetOrder.Response? Data { get; private set; }

    [BindProperty]
    public RefundRequest Refund { get; set; } = new();

    public sealed class RefundRequest
    {
        [DisplayName("환불 유형")]
        public RefundType Type { get; set; } = RefundType.Cancel;

        [DisplayName("환불 금액(P)")]
        [Range(1, int.MaxValue, ErrorMessage = "환불 금액은 1P 이상이어야 합니다.")]
        public int Amount { get; set; }

        [DisplayName("사유")]
        [Required(ErrorMessage = "{0}는 필수입니다.")]
        [StringLength(500)]
        public string Reason { get; set; } = "";
    }

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

    public async Task<IActionResult> OnPostRequestCouponsRefundAsync(int id, int orderItemID, List<int> couponCodeIds, CouponPostRefundAction action, string reason, CancellationToken ct)
    {
        if (couponCodeIds is null || couponCodeIds.Count == 0)
        {
            TempData["ErrorMessages"] = "환불할 쿠폰을 1개 이상 선택해 주세요.";
            return RedirectToPage("/Store/Order/Detail", new { id });
        }

        if (string.IsNullOrWhiteSpace(reason))
        {
            TempData["ErrorMessages"] = "환불 사유는 필수입니다.";
            return RedirectToPage("/Store/Order/Detail", new { id });
        }

        var lines = couponCodeIds.Distinct().Select(c => new CouponRefundLine(orderItemID, c, action)).ToList();
        var result = await mediator.Send(new Application.Features.Admin.Store.Order.RequestCouponsRefund.Command(id, lines, reason), ct);

        if (result.IsFailure)
        {
            TempData["ErrorMessages"] = result.Error.Description;
        }
        else
        {
            TempData["SuccessMessage"] = $"쿠폰 {lines.Count}건 환불 요청이 등록되었습니다. (RefundID={result.Value}) — '환불 이력' 표에서 '실행' 버튼으로 처리하세요.";
        }

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

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

        var result = await mediator.Send(new RequestOrderRefund.Command(id, Refund.Type, Refund.Amount, Refund.Reason), ct);

        if (result.IsFailure)
        {
            TempData["ErrorMessages"] = result.Error.Description;
        }
        else
        {
            TempData["SuccessMessage"] = $"환불 요청이 접수되었습니다. (RefundID={result.Value})";
        }

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

    public async Task<IActionResult> OnPostProcessRefundAsync(int id, int refundID, string? adminMemo, CancellationToken ct)
    {
        var admin = await userManager.GetUserAsync(User);

        if (admin is null)
        {
            TempData["ErrorMessages"] = "관리자 정보를 확인할 수 없습니다.";
            return RedirectToPage("/Store/Order/Detail", new { id });
        }

        var result = await mediator.Send(new ProcessOrderRefund.Command(refundID, admin.Id, admin.Email, adminMemo), ct);

        if (result.IsFailure)
        {
            TempData["ErrorMessages"] = result.Error.Description;
        }
        else
        {
            TempData["SuccessMessage"] = "환불 처리가 완료되었습니다.";
        }

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

    public async Task<IActionResult> OnPostRejectRefundAsync(int id, int refundID, string adminMemo, CancellationToken ct)
    {
        var admin = await userManager.GetUserAsync(User);

        if (admin is null)
        {
            TempData["ErrorMessages"] = "관리자 정보를 확인할 수 없습니다.";
            return RedirectToPage("/Store/Order/Detail", new { id });
        }

        if (string.IsNullOrWhiteSpace(adminMemo))
        {
            TempData["ErrorMessages"] = "거부 사유(메모)는 필수입니다.";
            return RedirectToPage("/Store/Order/Detail", new { id });
        }

        var result = await mediator.Send(new RejectOrderRefund.Command(refundID, admin.Id, admin.Email, adminMemo), ct);

        if (result.IsFailure)
        {
            TempData["ErrorMessages"] = result.Error.Description;
        }
        else
        {
            TempData["SuccessMessage"] = "환불 요청이 거부되었습니다.";
        }

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

    private async Task LoadOrderAsync(int id, CancellationToken ct)
    {
        var result = await mediator.Send(new GetOrder.Query(id), ct);

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

        Data = result.Value;
        Refund.Amount = Data.TotalAmount;
    }
}