@page "/meeting-schedule/history"
@attribute [Authorize]
@using Core.Entities
@using Microsoft.EntityFrameworkCore
@using WebApp.Components.Shared.Components
@using WebApp.Services
@inject ITeamMeetingHistoryService TeamMeetingHistoryService
@inject AppDbContext Context
@inject IDialogService DialogService
@inject ISnackbar Snackbar
@inject IConfiguration Configuration
@implements IAsyncDisposable

<PageHeader Title="Team Meeting Schedule History">
    <ActionButtons>
        <MudButton StartIcon="@Icons.Material.Filled.Add"
                  Variant="Variant.Outlined"
                  Color="Color.Primary"
                  Href="/meeting-schedule">
            Back to Schedule
        </MudButton>
    </ActionButtons>
</PageHeader>

<MudPaper Elevation="2" Class="pa-3 pa-md-6 mt-4">
    @if (_isLoading)
    {
        <MudProgressLinear Color="Color.Primary" Indeterminate="true" Class="my-4" />
    }
    else
    {
        <MudStack Spacing="3">
            @if (_meetingHistories.Any())
            {
                <MudPaper Elevation="1" Class="pa-3" Style="overflow-x: auto;">
                    <MudTable Items="_meetingHistories"
                             Hover="true"
                             Striped="true"
                             Dense="true"
                             Breakpoint="Breakpoint.Sm">
                        <ColGroup>
                            <col style="width: 100px;" />
                            @foreach (var team in _allTeams)
                            {
                                <col style="width: 40px;" />
                            }
                        </ColGroup>
                        <HeaderContent>
                            <MudTh Style="padding: 4px 8px; border-right: 2px solid var(--mud-palette-divider);">
                                <MudText Typo="Typo.caption" Style="writing-mode: vertical-rl; text-orientation: mixed;">
                                    Date
                                </MudText>
                            </MudTh>
                            @{
                                var teamIndex = 0;
                            }
                            @foreach (var team in _allTeams)
                            {
                                var isEven = teamIndex % 2 == 0;
                                var bgColor = isEven ? "background-color: var(--mud-palette-background-grey);" : "";
                                var headerStyle = $"padding: 4px 2px; border-right: 1px solid var(--mud-palette-divider); {bgColor}";
                                <MudTh Style="@headerStyle">
                                    <MudText Typo="Typo.caption" Style="writing-mode: vertical-rl; text-orientation: mixed; transform: rotate(180deg);">
                                        @team.ToString()
                                    </MudText>
                                </MudTh>
                                teamIndex++;
                            }
                        </HeaderContent>
                        <RowTemplate>
                            <MudTd Style="padding: 4px 8px; border-right: 2px solid var(--mud-palette-divider);">
                                <MudButton Variant="Variant.Text"
                                          Color="Color.Primary"
                                          Size="Size.Small"
                                          OnClick="@(() => ViewMeetingDetails(context))"
                                          Style="text-transform: none; padding: 2px 4px;">
                                    @context.MeetingDate.ToString("MM/dd/yy")
                                </MudButton>
                            </MudTd>
                            @{
                                var rowTeamIndex = 0;
                            }
                            @foreach (var team in _allTeams)
                            {
                                var met = TeamMetOnDate(context, team);
                                var isEven = rowTeamIndex % 2 == 0;
                                var bgColor = isEven ? "background-color: var(--mud-palette-background-grey);" : "";
                                var cellStyle = $"padding: 4px 2px; border-right: 1px solid var(--mud-palette-divider); {bgColor}";
                                <MudTd Align="Align.Center" Style="@cellStyle">
                                    @if (met)
                                    {
                                        <MudText Typo="Typo.body1" Style="font-weight: bold;">×</MudText>
                                    }
                                </MudTd>
                                rowTeamIndex++;
                            }
                        </RowTemplate>
                        <FooterContent>
                            <MudTd Style="padding: 4px 8px; border-right: 2px solid var(--mud-palette-divider); font-weight: bold;">
                                Times Met
                            </MudTd>
                            @{
                                var footerTeamIndex = 0;
                            }
                            @foreach (var team in _allTeams)
                            {
                                var timesMet = GetTimesMetForTeam(team);
                                var isEven = footerTeamIndex % 2 == 0;
                                var bgColor = isEven ? "background-color: var(--mud-palette-background-grey);" : "";
                                var footerCellStyle = $"padding: 4px 2px; border-right: 1px solid var(--mud-palette-divider); {bgColor}";
                                <MudTd Align="Align.Center" Style="@footerCellStyle">
                                    <MudText Typo="Typo.body2" Style="font-weight: bold;">@timesMet</MudText>
                                </MudTd>
                                footerTeamIndex++;
                            }
                        </FooterContent>
                    </MudTable>
                </MudPaper>
            }
            else
            {
                <MudAlert Severity="Severity.Info">No meeting history found. Save a meeting schedule to get started.</MudAlert>
            }
        </MudStack>
    }
</MudPaper>

@code {
    private List<TeamMeetingHistory> _meetingHistories = [];
    private List<Team> _allTeams = [];
    private Dictionary<int, int> _timesMetDict = new();
    private bool _isLoading = true;
    private CancellationTokenSource? _cancellationTokenSource;
    private bool _isDisposed = false;

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

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

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

        try
        {
            _isLoading = true;
            StateHasChanged();

            // Load all teams for columns
            _allTeams = await Context.Teams
                .AsNoTracking()
                .Include(t => t.Event)
                .OrderBy(t => t.Event.Name)
                .ThenBy(t => t.Identifier)
                .ToListAsync();

            // Load meeting histories
            await RefreshMeetingHistories();

            // Calculate times met
            CalculateTimesMet();
        }
        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 RefreshMeetingHistories()
    {
        _meetingHistories = (await TeamMeetingHistoryService.GetMeetingHistoriesAsync()).ToList();

        // Extract all unique teams from meeting histories and merge with all teams
        var teamsInHistory = _meetingHistories
            .SelectMany(mh => mh.Teams)
            .DistinctBy(t => t.Id)
            .ToList();

        // Merge with all teams, ensuring all teams are included
        var allTeamIds = _allTeams.Select(t => t.Id).ToHashSet();
        var newTeams = teamsInHistory.Where(t => !allTeamIds.Contains(t.Id)).ToList();
        _allTeams = _allTeams.Concat(newTeams).OrderBy(t => t.Event?.Name ?? "").ThenBy(t => t.Identifier).ToList();
    }

    private void CalculateTimesMet()
    {
        _timesMetDict.Clear();

        foreach (var team in _allTeams)
        {
            _timesMetDict[team.Id] = 0;
        }

        foreach (var history in _meetingHistories)
        {
            var teamIds = history.Teams.Select(t => t.Id).ToHashSet();
            foreach (var teamId in teamIds)
            {
                if (_timesMetDict.ContainsKey(teamId))
                {
                    _timesMetDict[teamId]++;
                }
            }
        }
    }

    private int GetTimesMetForTeam(Team team)
    {
        return _timesMetDict.GetValueOrDefault(team.Id, 0);
    }

    private bool TeamMetOnDate(TeamMeetingHistory history, Team team)
    {
        return history.Teams.Any(t => t.Id == team.Id);
    }

    private async Task ViewMeetingDetails(TeamMeetingHistory history)
    {
        var parameters = new DialogParameters
        {
            ["MeetingHistoryId"] = history.Id
        };

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

        var dialog = await DialogService.ShowAsync<MeetingHistoryDetailDialog>("Meeting Details", parameters, options);
        var result = await dialog.Result;

        if (!result.Canceled)
        {
            // Refresh data if meeting was updated or deleted
            await RefreshMeetingHistories();
            CalculateTimesMet();
            if (!_isDisposed)
            {
                StateHasChanged();
            }
        }
    }

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