@namespace WebApp.Components.Features.MeetingSchedule
@using Core.Entities
@using Core.Services
@using Core.Utility
@using WebApp.Services
@using WebApp.Components.Shared.Components
@using WebApp.Models
@inject ITeamMeetingHistoryService TeamMeetingHistoryService
@inject INotesService NotesService
@inject INoteNamingService NoteNamingService
@inject ISnackbar Snackbar
@inject IDialogService DialogService
@inject IMeetingScheduleDataService DataService
@inject IMeetingScheduleStateService StateService
@inject NavigationManager NavigationManager
@implements IAsyncDisposable

<MudDialog>
    <DialogContent>
        @if (_isLoading)
        {
            <MudProgressLinear Color="Color.Primary" Indeterminate="true" Class="my-4" />
        }
        else if (_meetingHistory == null)
        {
            <MudAlert Severity="Severity.Error">Meeting history not found.</MudAlert>
        }
        else
        {
            <MudStack Spacing="3">
                @* Navigation Header *@
                <MudStack Row="true" Justify="Justify.SpaceBetween" AlignItems="AlignItems.Center" Spacing="2">
                    <MudTooltip Text="@(_previousMeetingHistory != null ? $"Previous: {_previousMeetingHistory.MeetingDate:MM/dd/yyyy}" : "No previous meeting")">
                        <span>
                            <MudIconButton Icon="@Icons.Material.Filled.ChevronLeft"
                                          OnClick="NavigateToPrevious"
                                          Disabled="@(_previousMeetingHistory == null || IsActionDisabled)"
                                          Color="Color.Primary"
                                          Size="Size.Medium" />
                        </span>
                    </MudTooltip>
                    <MudText Typo="Typo.h6" Class="flex-grow-1" Style="text-align: center;">@_meetingHistory.MeetingDate.ToString("MM/dd/yyyy")</MudText>
                    <MudTooltip Text="@(_nextMeetingHistory != null ? $"Next: {_nextMeetingHistory.MeetingDate:MM/dd/yyyy}" : "No next meeting")">
                        <span>
                            <MudIconButton Icon="@Icons.Material.Filled.ChevronRight"
                                          OnClick="NavigateToNext"
                                          Disabled="@(_nextMeetingHistory == null || IsActionDisabled)"
                                          Color="Color.Primary"
                                          Size="Size.Medium" />
                        </span>
                    </MudTooltip>
                </MudStack>

                <MudText Typo="Typo.subtitle1">Teams That Met (@_meetingHistory.Teams.Count)</MudText>
                <MudPaper Elevation="1" Class="pa-2">
                    <MudStack Row="true" Spacing="1" Wrap="Wrap.Wrap">
                        @foreach (var team in _meetingHistory.Teams.OrderByEventFormatFirst().ThenBy(e => e.ToString()))
                        {
                            <MudChip T="string" Size="Size.Small" Color="Color.Default" Variant="@AppIcons.TeamChipVariant()" Class="mx-1 my-1">@team.ToString()</MudChip>
                        }
                    </MudStack>
                </MudPaper>

                <MudDivider />

                <MudText Typo="Typo.subtitle1">Students (@GetAllStudentsFromTeams().Count)</MudText>
                <MudPaper Elevation="1" Class="pa-2">
                    <MudStack Row="true" Spacing="1" Wrap="Wrap.Wrap">
                        @{
                            var presentStudentIds = _meetingHistory.Students.Select(s => s.Id).ToHashSet();
                            var allStudents = GetAllStudentsFromTeams().OrderBy(s => s.FirstName);
                        }
                        @foreach (var student in allStudents)
                        {
                            var isPresent = presentStudentIds.Contains(student.Id);
                            <MudChip T="string" 
                                   Size="Size.Small" 
                                   Color="Color.Default" 
                                   Variant="@AppIcons.StudentChipVariant()"
                                   Class="mx-1 my-1"
                                   Style="@(!isPresent ? "opacity: 0.5;" : "")">
                                @student.FirstNameLastName
                            </MudChip>
                        }
                    </MudStack>
                </MudPaper>

                @if (_meetingNote != null)
                {
                    <MudDivider />
                    <MudText Typo="Typo.subtitle1">Meeting Notes</MudText>
                    <MudPaper Elevation="1" Class="pa-3">
                        <MudText Typo="Typo.body2"><strong>@_meetingNote.Title</strong></MudText>
                        @if (!string.IsNullOrWhiteSpace(_meetingNote.Content))
                        {
                            <MudText Typo="Typo.body2" Class="mt-2">
                                @((MarkupString)MarkdownHelper.ToHtml(_meetingNote.Content))
                            </MudText>
                        }
                        <MudButton Variant="Variant.Text"
                                  Size="Size.Small"
                                  Color="Color.Primary"
                                  StartIcon="@Icons.Material.Filled.Edit"
                                  OnClick="ViewNote"
                                  Class="mt-2">
                            Edit Note
                        </MudButton>
                    </MudPaper>
                }
            </MudStack>
        }
    </DialogContent>
    <DialogActions>
        @if (_meetingHistory != null)
        {
            <MudButton Variant="Variant.Text"
                      Color="Color.Error"
                      OnClick="ConfirmDelete"
                      Disabled="@IsActionDisabled">
                Delete
            </MudButton>
            <MudSpacer />
            <MudButton Variant="Variant.Text"
                      Color="Color.Secondary"
                      OnClick="LoadIntoPlanner"
                      Disabled="@IsActionDisabled"
                      StartIcon="@Icons.Material.Filled.Upload">
                Load into Planner
            </MudButton>
            <MudButton Variant="Variant.Text"
                      Color="Color.Primary"
                      OnClick="OpenEditDialog"
                      Disabled="@IsActionDisabled"
                      StartIcon="@Icons.Material.Filled.Edit">
                Edit
            </MudButton>
            <MudButton OnClick="Close" Disabled="@IsActionDisabled">Close</MudButton>
        }
        else
        {
            <MudSpacer />
            <MudButton OnClick="Close">Close</MudButton>
        }
    </DialogActions>
</MudDialog>

@code {
    [CascadingParameter]
    IMudDialogInstance MudDialog { get; set; } = null!;

    [Parameter]
    public int MeetingHistoryId { get; set; }

    private TeamMeetingHistory? _meetingHistory;
    private Note? _meetingNote;
    private bool _isLoading = true;
    private bool _isDeleting = false;
    private Team[] _allTeams = [];
    private Student[] _allStudents = [];
    private CancellationTokenSource? _cancellationTokenSource;
    private bool _isDisposed = false;
    private bool IsActionDisabled => _isLoading || _isDeleting;
    private TeamMeetingHistory? _previousMeetingHistory;
    private TeamMeetingHistory? _nextMeetingHistory;

    protected override void OnInitialized()
    {
        _cancellationTokenSource = new CancellationTokenSource();
    }

    protected override async Task OnInitializedAsync()
    {
        // Load all teams and students for the edit dialog
        _allTeams = await DataService.LoadTeamsAsync();
        _allStudents = await DataService.LoadStudentsAsync();
        await LoadMeetingHistory();
    }

    private async Task LoadMeetingHistory()
    {
        if (_isDisposed) return;

        try
        {
            _meetingHistory = await TeamMeetingHistoryService.GetMeetingHistoryAsync(MeetingHistoryId);
            
            // Load note by title if meeting history exists
            if (_meetingHistory != null)
            {
                _meetingNote = await TeamMeetingHistoryService.GetMeetingNoteAsync(_meetingHistory.MeetingDate);
                
                // Load all meeting histories to find previous/next
                await LoadNavigationMeetings();
            }
        }
        catch (TaskCanceledException)
        {
            // Component was disposed, ignore
        }
        catch (JSDisconnectedException)
        {
            // JS connection lost, ignore
        }
        catch (Exception ex)
        {
            if (!_isDisposed)
            {
                Snackbar.Add($"Error loading meeting history: {ex.Message}", Severity.Error);
            }
        }
        finally
        {
            if (!_isDisposed)
            {
                _isLoading = false;
                StateHasChanged();
            }
        }
    }

    private async Task LoadNavigationMeetings()
    {
        if (_isDisposed || _meetingHistory == null) return;

        try
        {
            // Get all meeting histories ordered by date
            var allMeetings = (await TeamMeetingHistoryService.GetMeetingHistoriesAsync())
                .OrderBy(m => m.MeetingDate)
                .ThenBy(m => m.Id)
                .ToList();

            var currentIndex = allMeetings.FindIndex(m => m.Id == _meetingHistory.Id);
            
            if (currentIndex >= 0)
            {
                _previousMeetingHistory = currentIndex > 0 ? allMeetings[currentIndex - 1] : null;
                _nextMeetingHistory = currentIndex < allMeetings.Count - 1 ? allMeetings[currentIndex + 1] : null;
            }
            else
            {
                _previousMeetingHistory = null;
                _nextMeetingHistory = null;
            }
        }
        catch (TaskCanceledException)
        {
            // Component was disposed, ignore
        }
        catch (JSDisconnectedException)
        {
            // JS connection lost, ignore
        }
        catch (Exception ex)
        {
            if (!_isDisposed)
            {
                // Log error but don't show snackbar - navigation is not critical
                System.Diagnostics.Debug.WriteLine($"Error loading navigation meetings: {ex.Message}");
            }
        }
    }

    private async Task NavigateToPrevious()
    {
        if (_previousMeetingHistory == null || _isDisposed) return;

        // Close current dialog and open new one with previous meeting ID
        var parameters = new DialogParameters
        {
            ["MeetingHistoryId"] = _previousMeetingHistory.Id
        };

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

        MudDialog.Close();
        await DialogService.ShowAsync<MeetingHistoryDetailDialog>("Meeting History", parameters, options);
    }

    private async Task NavigateToNext()
    {
        if (_nextMeetingHistory == null || _isDisposed) return;

        // Close current dialog and open new one with next meeting ID
        var parameters = new DialogParameters
        {
            ["MeetingHistoryId"] = _nextMeetingHistory.Id
        };

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

        MudDialog.Close();
        await DialogService.ShowAsync<MeetingHistoryDetailDialog>("Meeting History", parameters, options);
    }

    private async Task ConfirmDelete()
    {
        if (_isDisposed || _isDeleting || _meetingHistory == null) return;

        var result = await DialogService.ShowMessageBox(
            "Confirm Delete",
            $"Are you sure you want to delete the meeting history for {_meetingHistory.MeetingDate:MM/dd/yyyy}? This action cannot be undone.",
            yesText: "Delete",
            cancelText: "Cancel");

        if (result == true)
        {
            await DeleteMeetingHistory();
        }
    }

    private async Task DeleteMeetingHistory()
    {
        if (_isDisposed || _isDeleting || _meetingHistory == null) return;

        try
        {
            _isDeleting = true;
            StateHasChanged();

            await TeamMeetingHistoryService.DeleteMeetingHistoryAsync(MeetingHistoryId);

            if (!_isDisposed)
            {
                Snackbar.Add("Meeting history deleted successfully", Severity.Success);
                MudDialog.Close(DialogResult.Ok(true));
            }
        }
        catch (TaskCanceledException)
        {
            // Component was disposed, ignore
        }
        catch (JSDisconnectedException)
        {
            // JS connection lost, ignore
        }
        catch (Exception ex)
        {
            if (!_isDisposed)
            {
                Snackbar.Add($"Error deleting meeting history: {ex.Message}", Severity.Error);
                _isDeleting = false;
                StateHasChanged();
            }
        }
    }

    private async Task ViewNote()
    {
        if (_meetingNote == null) return;

        var parameters = new DialogParameters
        {
            ["NoteId"] = _meetingNote.Id
        };

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

        var dialog = await DialogService.ShowAsync<NoteViewDialog>("Meeting Notes", parameters, options);
        await dialog.Result;

        // Refresh meeting history to get updated note
        await LoadMeetingHistory();
    }

    private async Task OpenEditDialog()
    {
        if (_meetingHistory == null || _isDisposed) return;

        var parameters = new DialogParameters
        {
            ["MeetingHistoryId"] = _meetingHistory.Id,
            ["AllTeams"] = _allTeams,
            ["AllStudents"] = _allStudents,
            ["ScheduledTeams"] = new List<Team>(), // Not used when editing
            ["AbsentStudents"] = new List<Student>() // Not used when editing
        };

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

        var dialog = await DialogService.ShowAsync<SaveMeetingHistoryDialog>("Edit Meeting History", parameters, options);
        var result = await dialog.Result;

        // Refresh meeting history if dialog was saved
        if (!result.Canceled && !_isDisposed)
        {
            await LoadMeetingHistory();
        }
    }

    private List<Student> GetAllStudentsFromTeams()
    {
        if (_meetingHistory == null)
            return [];

        var allStudents = new List<Student>();
        var studentIds = new HashSet<int>();

        foreach (var team in _meetingHistory.Teams)
        {
            foreach (var student in team.Students)
            {
                if (!studentIds.Contains(student.Id))
                {
                    studentIds.Add(student.Id);
                    allStudents.Add(student);
                }
            }
        }

        return allStudents;
    }

    private async Task LoadIntoPlanner()
    {
        if (_isDisposed || _meetingHistory == null) return;

        try
        {
            // Get all teams and students from database
            var allTeams = await DataService.LoadTeamsAsync();
            var allStudents = await DataService.LoadStudentsAsync();

            // Match teams from history to all teams by ID for reference equality
            var historyTeamIds = _meetingHistory.Teams.Select(t => t.Id).ToHashSet();
            var scheduledTeams = allTeams.Where(t => historyTeamIds.Contains(t.Id));

            // Calculate absent students (all students not in the meeting history's student list)
            var presentStudentIds = _meetingHistory.Students.Select(s => s.Id).ToHashSet();
            var absentStudents = allStudents.Where(s => !presentStudentIds.Contains(s.Id));

            // Save state to localStorage
            await StateService.SaveScheduledTeamsAsync(scheduledTeams);
            await StateService.SaveAbsentStudentsAsync(absentStudents);
            // Clear extended teams and excluded students when loading from history
            await StateService.SaveExtendedTeamsAsync([]);
            await StateService.SaveExcludedStudentsAsync(new Dictionary<(int teamId, int timeSlotIndex, int studentId), bool>());

            // Close dialog and navigate to planner
            MudDialog.Close();
            NavigationManager.NavigateTo("/meeting-schedule");

            if (!_isDisposed)
            {
                Snackbar.Add($"Loaded meeting from {_meetingHistory.MeetingDate:MM/dd/yyyy} into planner", Severity.Success);
            }
        }
        catch (TaskCanceledException)
        {
            // Component was disposed, ignore
        }
        catch (JSDisconnectedException)
        {
            // JS connection lost, ignore
        }
        catch (Exception ex)
        {
            if (!_isDisposed)
            {
                Snackbar.Add($"Error loading meeting into planner: {ex.Message}", Severity.Error);
            }
        }
    }

    private void Close()
    {
        if (_isDisposed) return;
        MudDialog.Close();
    }

    public async ValueTask DisposeAsync()
    {
        if (!_isDisposed)
        {
            _isDisposed = true;
            _cancellationTokenSource?.Cancel();
            _cancellationTokenSource?.Dispose();
            _cancellationTokenSource = null;
        }
        await ValueTask.CompletedTask;
    }
}