PlotDirector/PlotLine/Controllers/StoryCalendarController.cs

using System.Globalization;
using Microsoft.AspNetCore.Authorization;
using Microsoft.AspNetCore.Mvc;
using PlotLine.Services;

namespace PlotLine.Controllers;

[Authorize]
public sealed class StoryCalendarController(IStoryCalendarService calendar) : Controller
{
    public async Task<IActionResult> Index(int projectId, int? bookId, string? month, string? date)
    {
        if (projectId == 0)
        {
            return BadRequest("ProjectID is required.");
        }

        var selectedMonth = ParseMonth(month);
        var selectedDate = ParseDate(date);
        var model = await calendar.GetAsync(projectId, bookId, selectedMonth, selectedDate);
        return model is null ? NotFound() : View(model);
    }

    [HttpPost]
    [ValidateAntiForgeryToken]
    public IActionResult ApplyFilters(int projectId, int? bookId, string? month)
    {
        return RedirectToAction(nameof(Index), new
        {
            projectId,
            bookId,
            month
        });
    }

    private static DateOnly? ParseMonth(string? value)
    {
        if (string.IsNullOrWhiteSpace(value))
        {
            return null;
        }

        return DateOnly.TryParseExact(
            $"{value.Trim()}-01",
            "yyyy-MM-dd",
            CultureInfo.InvariantCulture,
            DateTimeStyles.None,
            out var parsed)
            ? new DateOnly(parsed.Year, parsed.Month, 1)
            : null;
    }

    private static DateOnly? ParseDate(string? value)
    {
        if (string.IsNullOrWhiteSpace(value))
        {
            return null;
        }

        return DateOnly.TryParseExact(
            value.Trim(),
            "yyyy-MM-dd",
            CultureInfo.InvariantCulture,
            DateTimeStyles.None,
            out var parsed)
            ? parsed
            : null;
    }
}