using System.Globalization;
using Microsoft.Maui.Controls.Shapes;

namespace CORP_MAUI.Controls;

public partial class DesktopCalendarPanel : ContentView
{
    private DateTime _currentMonth;
    private static readonly CultureInfo RuCulture = new("ru-RU");
    
    public DesktopCalendarPanel()
    {
        InitializeComponent();
        _currentMonth = DateTime.Today;
        UpdateCalendar();
    }
    
    private void UpdateCalendar()
    {
        MonthYearLabel.Text = _currentMonth.ToString("MMMM yyyy", RuCulture);
        MonthYearLabel.Text = char.ToUpper(MonthYearLabel.Text[0]) + MonthYearLabel.Text[1..];
        CalendarGrid.Children.Clear();
        
        var firstDay = new DateTime(_currentMonth.Year, _currentMonth.Month, 1);
        int startColumn = ((int)firstDay.DayOfWeek + 6) % 7;
        int daysInMonth = DateTime.DaysInMonth(_currentMonth.Year, _currentMonth.Month);
        
        int row = 0;
        int col = startColumn;
        
        for (int day = 1; day <= daysInMonth; day++)
        {
            var dayDate = new DateTime(_currentMonth.Year, _currentMonth.Month, day);
            bool isToday = dayDate.Date == DateTime.Today;
            bool isWeekend = col >= 5;
            
            var dayLabel = new Label
            {
                Text = day.ToString(),
                FontSize = 14,
                HorizontalOptions = LayoutOptions.Center,
                VerticalOptions = LayoutOptions.Center,
                TextColor = isToday ? Colors.White : (isWeekend ? Color.FromArgb("#0D6EFD") : Color.FromArgb("#333333"))
            };
            
            View dayView;
            if (isToday)
            {
                var border = new Border
                {
                    StrokeShape = new RoundRectangle { CornerRadius = 17 },
                    BackgroundColor = Color.FromArgb("#0D6EFD"),
                    HeightRequest = 34,
                    WidthRequest = 34,
                    Content = dayLabel
                };
                dayView = border;
            }
            else
            {
                dayView = dayLabel;
            }
            
            Grid.SetRow(dayView, row);
            Grid.SetColumn(dayView, col);
            CalendarGrid.Children.Add(dayView);
            
            col++;
            if (col > 6) { col = 0; row++; }
        }
        
        UpdateWeekRange();
    }
    
    private void UpdateWeekRange()
    {
        var today = DateTime.Today;
        int diff = ((int)today.DayOfWeek + 6) % 7;
        var weekStart = today.AddDays(-diff);
        var weekEnd = weekStart.AddDays(6);
        WeekRangeLabel.Text = $"{weekStart:d MMMM} – {weekEnd:d MMMM}";
    }
    
    private void OnPreviousMonthClicked(object? sender, EventArgs e)
    {
        _currentMonth = _currentMonth.AddMonths(-1);
        UpdateCalendar();
    }
    
    private void OnNextMonthClicked(object? sender, EventArgs e)
    {
        _currentMonth = _currentMonth.AddMonths(1);
        UpdateCalendar();
    }
    
    private void OnTodayClicked(object? sender, EventArgs e)
    {
        _currentMonth = DateTime.Today;
        UpdateCalendar();
    }
}