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.Faq.List;

public class EditModel(IMediator mediator) : PageModel
{
    [BindProperty]
    public string? QueryString { get; set; }
    public List<SelectListItem> Categories { get; private set; } = [];

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

    public sealed class InputModel
    {
        [DisplayName("ID")]
        [Required(ErrorMessage = "{0}는 필수입니다.")]
        public int ID { get; set; }

        [DisplayName("FAQ 분류")]
        [Required(ErrorMessage = "{0}는 필수입니다.")]
        public int CategoryID { get; set; }

        [DisplayName("질문")]
        [DataType(DataType.Text)]
        [Required(ErrorMessage = "{0}는 필수입니다.")]
        [StringLength(255, ErrorMessage = "{0}은 {1}자 이하로 입력하세요.")]
        public string Question { get; set; } = default!;

        [DisplayName("답변")]
        [DataType(DataType.Html)]
        public string? Answer { get; set; }

        [DisplayName("순서")]
        [Required(ErrorMessage = "{0}는 필수입니다.")]
        [Range(-9999, 9999, ErrorMessage = "{0}은 {1}에서 {2} 사이의 값이어야 합니다.")]
        public short Order { get; set; } = 0;

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

        public string? UpdatedAt { get; set; }
        public string CreatedAt { get; set; } = default!;
    }

    private async Task<List<SelectListItem>> GetCategories(CancellationToken ct)
    {
        return [..(await mediator.Send(new GetFaqCategories.Query(), ct)).List
               .Select(c => new SelectListItem
               {
                   Value = c.ID.ToString(),
                   Text = $"[{c.Code}] {c.Subject}"
               })];
    }

    public async Task<IActionResult> OnGetAsync(int id, CancellationToken ct)
    {
        QueryString = HttpContext.Request.QueryString.HasValue ? HttpContext.Request.QueryString.Value!.TrimStart('?') : "";

        Categories = await GetCategories(ct);

        var item = await mediator.Send(new GetFaqItem.Query(id), ct);
        if (item is null)
        {
            TempData["ErrorMessages"] = "해당 FAQ를 찾을 수 없습니다.";
            return RedirectToPage("/Faq/List/Index");
        }

        Input.ID = item.ID;
        Input.CategoryID = item.CategoryID;
        Input.Question = item.Question;
        Input.Answer = item.Answer;
        Input.Order = item.Order;
        Input.IsActive = item.IsActive;
        Input.UpdatedAt = item.UpdatedAt.GetDateAt();
        Input.CreatedAt = item.CreatedAt.GetDateAt();

        return Page();
    }

    public async Task<IActionResult> OnPostAsync(CancellationToken ct)
    {
        try
        {
            if (!ModelState.IsValid)
            {
                throw new Exception(ModelState.GetErrorMessages());
            }

            var command = new UpdateFaqItem.Command(
                Input.CategoryID,
                Input.ID,
                Input.Question,
                Input.Answer,
                Input.Order,
                Input.IsActive
            );

            await mediator.Send(command, ct);

            TempData["SuccessMessage"] = $"{Input.Question} FAQ가 수정되었습니다.";
        }
        catch (Exception e)
        {
            TempData["ErrorMessages"] = e.Message;
        }

        return Redirect($"/Faq/List/Edit/{Input.ID}?{QueryString}");
    }
}