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

namespace Admin.Pages.Stocks.MarketHoliday;

/// <summary>
/// KRX 휴장일 관리 — 목록(연도 필터)/추가/삭제. 수집 배치(KrxBackfill/MarketCalendar)의 영업일 판정에 사용되므로
/// 거래일을 휴장일로 잘못 등록하면 해당 날짜 데이터가 영구 결손된다 (추가/삭제 모두 confirm).
/// </summary>
public class IndexModel(IMediator mediator) : PageModel
{
    public int? Year { get; private set; }

    public int Total { get; private set; }

    public List<int> Years { get; private set; } = [];

    public List<(
        DateOnly Date,
        string DayOfWeek,
        string Name
    )> Data { get; private set; } = [];

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

    public sealed class InputModel
    {
        [Required]
        public DateOnly? Date { get; set; }

        [Required]
        [StringLength(50)]
        public string? Name { get; set; }
    }

    [BindProperty]
    public DateOnly DeleteDate { get; set; }

    public async Task OnGetAsync(int? year, CancellationToken ct)
    {
        Year = year;

        var result = await mediator.Send(new GetMarketHolidays.Query(year), ct);

        Total = result.Total;
        Years = [..result.Years];
        Data = [..result.List.Select(c => (
            c.Date,
            CultureInfo.GetCultureInfo("ko-KR").DateTimeFormat.GetDayName(c.Date.DayOfWeek),
            c.Name
        ))];
    }

    public async Task<IActionResult> OnPostAddAsync(int? year, CancellationToken ct)
    {
        if (!ModelState.IsValid || Input.Date is null || Input.Name is null)
        {
            TempData["ErrorMessages"] = ModelState.GetErrorMessages();
            return RedirectToIndex(year);
        }

        var result = await mediator.Send(new AddMarketHoliday.Command(Input.Date.Value, Input.Name), ct);

        if (result.IsFailure)
        {
            TempData["ErrorMessages"] = result.Error.Description;
        }
        else
        {
            TempData["SuccessMessage"] = $"{Input.Date.Value:yyyy-MM-dd} ({Input.Name}) 휴장일이 등록되었습니다.";
        }

        return RedirectToIndex(year);
    }

    public async Task<IActionResult> OnPostDeleteAsync(int? year, CancellationToken ct)
    {
        var result = await mediator.Send(new DeleteMarketHoliday.Command(DeleteDate), ct);

        if (result.IsFailure)
        {
            TempData["ErrorMessages"] = result.Error.Description;
        }
        else
        {
            TempData["SuccessMessage"] = $"{DeleteDate:yyyy-MM-dd} 휴장일이 삭제되었습니다.";
        }

        return RedirectToIndex(year);
    }

    private RedirectToPageResult RedirectToIndex(int? year)
    {
        return year.HasValue ? RedirectToPage("/Stocks/MarketHoliday/Index", new { year }) : RedirectToPage("/Stocks/MarketHoliday/Index");
    }
}