@using Template.Shared.Core.Dto
@using Template.Shared.Core.Interface
@inject IManageDataService manageData

<div class="calendar-activity">
    <div class="calendar">
        @foreach (var nomeGiorno in _giorniSettimana)
        {
            <div class="calendar-header">@nomeGiorno</div>
        }

        @for (var i = 0; i < StartDays; i++)
        {
            <div class="calendar-day disabled @(i == 0 ? "radiusTopLeft" : "")"></div>
        }

        @for (var day = 1; day <= DaysInMonth; day++)
        {
            var currentDate = new DateTime(Date.Year, Date.Month, day);
            var events = GetEventsForDay(currentDate);
            var daySelected = SelectedDate == currentDate;
            var isToday = currentDate == DateTime.Today;

            var topRight = StartDays == 0 ? 7 : 7 - StartDays;
            var bottomLeft = DaysInMonth - (6 - EndDays);

            var categoryActivityCount = events.Select(x => x.Category).Distinct().ToList();

            <div @onclick="() => SelectDay(currentDate)" class="calendar-day @(isToday ? "today" : daySelected ? "selectedDay" : "")
                                 @(StartDays == 0 && day == 1 ? "radiusTopLeft" : "") 
                                 @(EndDays == 0 && day == DaysInMonth ? "radiusBottomRight" : "")
                                 @(bottomLeft == day ? "radiusBottomLeft" : "")
                                 @(topRight == day ? "radiusTopRight" : "")">

                <div class="calendar-day-wrapper">
                    <span class="titleDay">@day</span>
                    @if (events.Any())
                    {
                        <div class="event-dot-container">
                            @foreach (var activityCategory in categoryActivityCount)
                            {
                                <div class="event-dot @activityCategory.ConvertToHumanReadable()"></div>
                            }
                        </div>
                    }
                </div>
            </div>
        }

        @for (var i = 0; i < EndDays; i++)
        {
            <div class="calendar-day disabled @(i + 1 == EndDays ? "radiusBottomRight" : "")"></div>
        }
    </div>

    <div class="activityContainer">
        @if (!FilteredActivityList.IsNullOrEmpty())
        {
            @foreach (var activity in FilteredActivityList!)
            {
                <ActivityCard Activity="activity"/>
            }
        }
    </div>
</div>

@code
{
    [Parameter] public required DateTime Date { get; set; }
    [Parameter] public EventCallback<DateTime> DateChanged { get; set; }

    private List<ActivityDTO> ActivityList { get; set; } = [];
    private List<ActivityDTO> FilteredActivityList { get; set; } = [];
    private DateTime SelectedDate { get; set; } = DateTime.Today;

    private int DaysInMonth { get; set; }
    private int StartDays { get; set; }
    private int EndDays { get; set; }

    readonly string[] _giorniSettimana = ["Lu", "Ma", "Me", "Gi", "Ve", "Sa", "Do"];

    protected override async Task OnInitializedAsync()
    {
        await ChangeMonth();
    }

    protected override async Task OnParametersSetAsync()
    {
        await ChangeMonth();
    }

    private async Task ChangeMonth()
    {
        var firstDay = Date;
        DaysInMonth = DateTime.DaysInMonth(firstDay.Year, firstDay.Month);

        var dayOfWeek = (int)firstDay.DayOfWeek;
        StartDays = dayOfWeek == 0 ? 6 : dayOfWeek - 1;

        var tempTotalCell = (int)Math.Ceiling((double)(DaysInMonth + StartDays) / 7);
        var totalCell = tempTotalCell * 7;
        EndDays = totalCell - (DaysInMonth + StartDays);

        await LoadData();
    }

    private async Task LoadData()
    {
        // Load = true;
        // StateHasChanged();

        await Task.Delay(500);
        var refreshActivity = await RefreshActivity();
        ActivityList = refreshActivity;
        // Load = false;
        StateHasChanged();
    }

    private async Task<List<ActivityDTO>> RefreshActivity()
    {
        var startDate = Date;
        var endDate = Date.AddDays(DateTime.DaysInMonth(startDate.Year, startDate.Month) - 1);

        var dateRange = new DateRange(Date, endDate);

        var activityDto = await Task.Run(async () =>
        {
            return (await manageData.GetActivity(x =>
                    (x.EffectiveDate == null && x.EstimatedDate >= dateRange.Start && x.EstimatedDate <= dateRange.End) ||
                    (x.EffectiveDate >= dateRange.Start && x.EffectiveDate <= dateRange.End)
                ))
                .OrderBy(x => x.EffectiveDate ?? x.EstimatedDate)
                .ToList();
        });

        return activityDto;
    }

    private List<ActivityDTO> GetEventsForDay(DateTime day)
    {
        return ActivityList.IsNullOrEmpty() ? [] : ActivityList.Where(x => (x.EffectiveDate ?? x.EstimatedDate) == day.Date).ToList();
    }

    private void SelectDay(DateTime currentDate)
    {
        SelectedDate = currentDate;
        StateHasChanged();
        FilteredActivityList = GetEventsForDay(currentDate);
    }
}