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;

namespace Admin.Pages.Forum.Posts.List;

public class AnswerModel(IMediator mediator, UserManager<ApplicationUser> userManager) : PageModel
{
    public int ID { get; set; }
    public int BoardID { get; set; }
    public string BoardName { get; set; } = default!;
    public string? BoardPrefixName { get; set; }
    public string? BoardPrefixColor { get; set; }
    public string Subject { get; set; } = default!;
    public new string Content { get; set; } = default!;
    public string? Name { get; set; }
    public string? SID { get; set; }
    public bool IsSecret { get; set; }
    public bool IsAnswered => Answers.Count > 0;
    public string CreatedAt { get; set; } = default!;

    public List<FileItemView> Files { get; set; } = [];

    public List<AnswerItemView> Answers { get; set; } = [];

    public string? ReturnUrl { get; set; }
    public string? QueryString { get; set; }

    public sealed record FileItemView(int ID, string FileName, string Url, long? Size);
    public sealed record AnswerItemView(int ID, string? Name, string Content, string CreatedAt);

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

    public sealed class InputModel
    {
        [DisplayName("답변 내용")]
        [Required(ErrorMessage = "{0}을 입력해주세요.")]
        public string Content { get; set; } = null!;

        [DisplayName("첨부파일")]
        public List<IFormFile>? Files { get; set; }
    }

    public async Task<IActionResult> OnGetAsync(int id, CancellationToken ct)
    {
        var loaded = await LoadAsync(id, ct);
        if (!loaded)
        {
            return RedirectToPage("/Forum/Posts/List/Index");
        }

        return Page();
    }

    public async Task<IActionResult> OnPostAsync(int id, CancellationToken ct)
    {
        if (!ModelState.IsValid)
        {
            TempData["ErrorMessages"] = ModelState.GetErrorMessages();
            return RedirectToPage("/Forum/Posts/List/Answer", new { id });
        }

        var admin = await userManager.GetUserAsync(User);

        var result = await mediator.Send(new CreateAnswerComment.Command(
            id,
            Input.Content,
            Input.Files,
            admin?.Email
        ), ct);

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

        return RedirectToPage("/Forum/Posts/List/Answer", new { id });
    }

    private async Task<bool> LoadAsync(int id, CancellationToken ct)
    {
        var postResult = await mediator.Send(new GetPost.Query(id), ct);
        if (postResult.IsFailure)
        {
            TempData["ErrorMessages"] = postResult.Error.Description;
            return false;
        }

        var post = postResult.Value;
        if (!post.IsQnA)
        {
            TempData["ErrorMessages"] = "1:1 문의 게시판의 게시글이 아닙니다.";
            return false;
        }

        ID = post.ID;
        BoardID = post.BoardID;
        BoardName = post.BoardName;
        BoardPrefixName = post.BoardPrefixName;
        BoardPrefixColor = post.BoardPrefixColor;
        Subject = post.Subject;
        Content = post.Content;
        Name = post.Name;
        SID = post.SID;
        IsSecret = post.IsSecret;
        CreatedAt = post.CreatedAt.GetDateAt();

        Files = [..post.Files.Where(c => !c.IsDisabled).Select(c => new FileItemView(c.ID, c.FileName, c.Url, c.Size))];

        // 기존 답변 (게시글의 댓글, 오래된 순)
        var comments = await mediator.Send(new SearchComments.Query(null, id, null, null, null, null, null, 1, 100), ct);

        Answers = [..comments.List
            .Where(c => !c.IsDeleted)
            .OrderBy(c => c.ID)
            .Select(c => new AnswerItemView(c.ID, c.Name ?? c.SID, c.Content, c.CreatedAt.GetDateAt()))];

        ReturnUrl = Request.Headers.Referer.ToString();
        QueryString = Request.QueryString.ToString();

        return true;
    }
}