@page "/calendar"
@attribute [Authorize]
@using WebApp.Models
@using WebApp.Services
@using Heron.MudCalendar
@using Microsoft.Extensions.Logging
@using WebApp.Authentication
@using Core.Utility
@inject IEventOccurrenceService EventOccurrenceService
@inject ILogger<Index> Logger
@inject IDialogService DialogService

<PageHeader Title="Event Calendar" Description="View competition schedules and event occurrences" Icon="@AppIcons.EventCalendar">
    <ActionButtons>
        <MudButton StartIcon="@Icons.Material.Filled.ImportExport" Href="calendar/event-occurrences/import" Variant="Variant.Filled" Color="Color.Primary">Import</MudButton>
        <AuthorizeView Roles="@AuthRoles.Administrator">
            <MudButton StartIcon="@Icons.Material.Filled.AdminPanelSettings" Href="calendar/admin" Variant="Variant.Outlined" Color="Color.Default">Admin</MudButton>
        </AuthorizeView>
        <PageNoteButton PageIdentifier="Event Calendar" />
    </ActionButtons>
</PageHeader>

<MudPaper Elevation="2" Class="pa-3 pa-md-6">
    @if (_calendarItems == null)
    {
        <MudProgressLinear Indeterminate="true" />
        <MudText>Loading calendar events...</MudText>
    }
    else
    {
        <MudStack Spacing="2">
            <MudButtonGroup Variant="Variant.Outlined" Size="Size.Small">
                <MudButton Color="@(_currentView == CalendarView.Month ? Color.Primary : Color.Default)"
                          OnClick="() => { _currentView = CalendarView.Month; StateHasChanged(); }">
                    Month
                </MudButton>
                <MudButton Color="@(_currentView == CalendarView.Day ? Color.Primary : Color.Default)"
                          OnClick="() => { _currentView = CalendarView.Day; StateHasChanged(); }">
                    Day
                </MudButton>
            </MudButtonGroup>
            
            <MudCalendar T="CalendarEventItem" 
                         Items="_calendarItems" 
                         View="_currentView"
                         CurrentDay="@_calendarDate"
                         Class="event-calendar"
                         ItemClicked="OnItemClicked">
            <MonthTemplate>
                @* <MudTooltip Text="@GetEventTooltip(context)"> *@
                    <div class="d-flex gap-1">
                        <MudIcon Icon="@Icons.Material.Filled.Circle" Color="Color.Secondary" Size="Size.Small"/>
                        <div>@context.Text</div>
                    </div>
                @* </MudTooltip> *@
            </MonthTemplate>
            <WeekTemplate>
                @* <MudTooltip Text="@GetEventTooltip(context)"> *@
                    <div style="width: 100%; height: 100%;">
                        @context.Text
                    </div>
                @* </MudTooltip> *@
            </WeekTemplate>
            <DayTemplate>
                @* <MudTooltip Text="@GetEventTooltip(context)"> *@
                    <div>@context.Text</div>
                @* </MudTooltip> *@
            </DayTemplate>
        </MudCalendar>
        </MudStack>
    }
</MudPaper>

@code {
    private List<CalendarEventItem>? _calendarItems;
    private DateTime _calendarDate = DateTime.Today;
    private CalendarView _currentView = CalendarView.Month;

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

    private async Task LoadCalendarEvents()
    {
        try
        {
            Logger.LogInformation("Loading calendar events");
            var occurrences = await EventOccurrenceService.GetEventOccurrencesAsync();

            var eventOccurrences = occurrences as EventOccurrence[] ?? occurrences.ToArray();
            Logger.LogDebug("Received {Count} occurrences from service", eventOccurrences.Count());
            
            // Get all unique event definition IDs that have occurrences
            var eventDefinitionIds = eventOccurrences
                .Where(occ => occ?.EventDefinition?.Id != null)
                .Select(occ => occ!.EventDefinition!.Id)
                .Distinct()
                .ToList();

            // Load teams for all event definitions
            var teamsByEventId = await EventOccurrenceService.GetTeamsByEventDefinitionIdsAsync(eventDefinitionIds);
            
            List<CalendarEventItem> items = [];
            foreach (var occ in eventOccurrences)
            {
                try
                {
                    if (string.IsNullOrEmpty(occ.Name))
                    {
                        Logger.LogWarning("Occurrence with Id={Id} has null or empty Name", occ.Id);
                    }
                    
                    // Get student first names for this event definition
                    var studentFirstNames = occ.EventDefinition != null && teamsByEventId.TryGetValue(occ.EventDefinition.Id, out var teams)
                        ? TeamStudentNameFormatter.FormatStudentListForEvent(
                            occ.EventDefinition,
                            teams,
                            new TeamStudentNameFormatter.FormatOptions
                            {
                                CaptainIndicator = TeamStudentNameFormatter.CaptainIndicatorStyle.Star,
                                Ordering = TeamStudentNameFormatter.OrderingStyle.Alphabetical
                            })
                        : [];

                    var calendarItem = new CalendarEventItem(occ, studentFirstNames);
                    items.Add(calendarItem);
                }
                catch (Exception ex)
                {
                    Logger.LogError(ex, "Error creating CalendarEventItem for occurrence Id={Id}, Name={Name}", 
                        occ?.Id, occ?.Name);
                    // Continue processing other items
                }
            }
            
            _calendarItems = items;
            Logger.LogInformation("Created {Count} calendar items from {OccurrenceCount} occurrences", 
                _calendarItems.Count, eventOccurrences.Count());

            // Find the next date with events
            _calendarDate = GetNextDateWithEvents();
        }
        catch (Exception ex)
        {
            Logger.LogError(ex, "Error loading calendar events");
            _calendarItems = [];
        }
        finally
        {
            StateHasChanged();
        }
    }


    private DateTime GetNextDateWithEvents()
    {
        try
        {
            if (_calendarItems == null || !_calendarItems.Any())
            {
                Logger.LogDebug("No calendar items available, returning today's date");
                return DateTime.Today;
            }

            var today = DateTime.Today;
            var nextEvent = _calendarItems
                .Where(item => 
                {
                    try
                    {
                        return item.Start.Date >= today;
                    }
                    catch (Exception ex)
                    {
                        Logger.LogWarning(ex, "Error checking item date, skipping item");
                        return false;
                    }
                })
                .OrderBy(item => item.Start)
                .FirstOrDefault();

            if (nextEvent != null)
            {
                return nextEvent.Start.Date;
            }

            // Fallback to first event if no future events
            var firstEvent = _calendarItems
                .OrderBy(item => item.Start)
                .FirstOrDefault();
            
            return firstEvent != null ? firstEvent.Start.Date : DateTime.Today;
        }
        catch (Exception ex)
        {
            Logger.LogError(ex, "Error in GetNextDateWithEvents");
            return DateTime.Today;
        }
    }

    private string GetEventTooltip(CalendarEventItem item)
    {
        List<string> parts = [];
        
        if (!string.IsNullOrEmpty(item.EventDefinition?.Name))
        {
            parts.Add($"Event: {item.EventDefinition.Name}");
        }
        
        if (!string.IsNullOrEmpty(item.EventOccurrenceData?.Name))
        {
            parts.Add($"Occurrence: {item.EventOccurrenceData.Name}");
        }
        
        if (!string.IsNullOrEmpty(item.EventOccurrenceData?.Location))
        {
            parts.Add($"Location: {item.EventOccurrenceData.Location}");
        }
        
        if (item.EventOccurrenceData?.StartTime != null)
        {
            parts.Add($"Time: {item.EventOccurrenceData.StartTime:g}");
        }
        
        if (item.StudentFirstNames.Any())
        {
            parts.Add($"Students: {string.Join(", ", item.StudentFirstNames)}");
        }
        
        return string.Join("\n", parts);
    }

    private async Task OnItemClicked(CalendarEventItem calendarEventItem)
    {
        if (_calendarItems == null)
            return;

        await ShowEventDetails(calendarEventItem);
    }

    private async Task ShowEventDetails(CalendarEventItem item)
    {
        if (item.EventOccurrenceData == null) return;

        var parameters = new DialogParameters
        {
            ["EventOccurrence"] = item.EventOccurrenceData,
            ["EventDefinition"] = item.EventDefinition,
            ["StudentFirstNames"] = item.StudentFirstNames
        };

        var options = new DialogOptions
        {
            CloseOnEscapeKey = true,
            CloseButton = true,
            MaxWidth = MaxWidth.Medium,
            FullWidth = true
        };

        await DialogService.ShowAsync<EventOccurrenceDetailsDialog>("Event Details", parameters, options);
    }
}