@page "/group/{GroupId:guid}/stats"
@using GmRelay.Web.Services
@using GmRelay.Shared.Domain
@using Microsoft.AspNetCore.Authorization
@using Microsoft.AspNetCore.Components.Authorization
@using System.Security.Claims
@attribute [Authorize]
@inject AuthorizedSessionService SessionService
@inject AuthenticationStateProvider AuthStateProvider
@inject NavigationManager Navigation

<PageTitle>Статистика — GM-Relay</PageTitle>

<div class="page-container">
    <ul class="gm-breadcrumb animate-fade-in">
        <li><a href="/">Главная</a></li>
        <li><a href="/group/@GroupId">Сессии группы</a></li>
        <li class="active">Статистика</li>
    </ul>

    <div class="page-header animate-fade-in">
        <h2>📊 Статистика посещаемости</h2>
        <p class="page-subtitle">Надёжность состава и качество расписания</p>
    </div>

    @if (!string.IsNullOrEmpty(errorMessage))
    {
        <div class="gm-alert gm-alert-danger" style="margin-bottom: 1rem;">
            ⚠️ @errorMessage
        </div>
    }

    @if (stats is null)
    {
        <div class="loading-spinner">⏳ Загружаем статистику…</div>
    }
    else if (stats.Count == 0)
    {
        <div class="empty-state">
            <div class="empty-icon">📈</div>
            <h3>Пока нет данных</h3>
            <p>После первых сессий здесь появится аналитика.</p>
        </div>
    }
    else
    {
        <div class="glass-card animate-slide-up" style="margin-bottom: 1rem;">
            <div class="stats-summary" style="display: grid; grid-template-columns: repeat(auto-fit, minmax(120px, 1fr)); gap: 1rem; margin-bottom: 1.5rem;">
                <div class="stat-card">
                    <div class="stat-value">@stats.Count</div>
                    <div class="stat-label">Игроков</div>
                </div>
                <div class="stat-card">
                    <div class="stat-value">@TotalSessions</div>
                    <div class="stat-label">Сессий</div>
                </div>
                <div class="stat-card">
                    <div class="stat-value">@AvgAttendanceRate%</div>
                    <div class="stat-label">Средняя посещаемость</div>
                </div>
                <div class="stat-card">
                    <div class="stat-value">@topPlayer?.DisplayName</div>
                    <div class="stat-label">Самый стабильный</div>
                </div>
            </div>

            <div class="table-responsive">
                <table class="gm-table" style="width: 100%;">
                    <thead>
                        <tr>
                            <th @onclick="@(() => SortBy("player"))" style="cursor:pointer;" class="sortable">Игрок  @(sortColumn == "player" ? (sortDesc ? "▼" : "▲") : "")</th>
                            <th @onclick="@(() => SortBy("total"))" style="cursor:pointer; text-align:center;" class="sortable">Всего  @(sortColumn == "total" ? (sortDesc ? "▼" : "▲") : "")</th>
                            <th @onclick="@(() => SortBy("confirmed"))" style="cursor:pointer; text-align:center;" class="sortable">✅  @(sortColumn == "confirmed" ? (sortDesc ? "▼" : "▲") : "")</th>
                            <th @onclick="@(() => SortBy("declined"))" style="cursor:pointer; text-align:center;" class="sortable">❌  @(sortColumn == "declined" ? (sortDesc ? "▼" : "▲") : "")</th>
                            <th @onclick="@(() => SortBy("noresponse"))" style="cursor:pointer; text-align:center;" class="sortable">💤  @(sortColumn == "noresponse" ? (sortDesc ? "▼" : "▲") : "")</th>
                            <th @onclick="@(() => SortBy("waitlist"))" style="cursor:pointer; text-align:center;" class="sortable">⏳  @(sortColumn == "waitlist" ? (sortDesc ? "▼" : "▲") : "")</th>
                            <th @onclick="@(() => SortBy("rate"))" style="cursor:pointer; text-align:center;" class="sortable">%  @(sortColumn == "rate" ? (sortDesc ? "▼" : "▲") : "")</th>
                            <th @onclick="@(() => SortBy("cancelled"))" style="cursor:pointer; text-align:center;" class="sortable">🚫  @(sortColumn == "cancelled" ? (sortDesc ? "▼" : "▲") : "")</th>
                        </tr>
                    </thead>
                    <tbody>
                        @foreach (var s in sortedStats)
                        {
                            <tr>
                                <td>
                                    <div class="player-info">
                                        <span class="player-name">@s.DisplayName</span>
                                        @if (!string.IsNullOrEmpty(s.ExternalUsername))
                                        {
                                            <span class="player-username">@@@s.ExternalUsername</span>
                                        }
                                    </div>
                                </td>
                                <td style="text-align:center;">@s.TotalSessions</td>
                                <td style="text-align:center;">@s.ConfirmedCount</td>
                                <td style="text-align:center;">@s.DeclinedCount</td>
                                <td style="text-align:center;">@s.NoResponseCount</td>
                                <td style="text-align:center;">@s.WaitlistedCount</td>
                                <td style="text-align:center;">
                                    <span class="rate-badge @AttendanceBadgeClass(s.AttendanceRate)">
                                        @s.AttendanceRate%
                                    </span>
                                </td>
                                <td style="text-align:center;">@s.CancellationAffectedCount</td>
                            </tr>
                        }
                    </tbody>
                </table>
            </div>
        </div>
    }
</div>

<style>
    .stat-card {
        background: var(--card-bg-secondary, rgba(255,255,255,0.05));
        border-radius: 0.75rem;
        padding: 1rem;
        text-align: center;
    }
    .stat-value {
        font-size: 1.5rem;
        font-weight: 700;
        color: var(--accent-color, #7cb97a);
    }
    .stat-label {
        font-size: 0.8rem;
        color: var(--text-muted, #94a3b8);
        margin-top: 0.25rem;
    }
    .player-info {
        display: flex;
        flex-direction: column;
    }
    .player-name {
        font-weight: 500;
    }
    .player-username {
        font-size: 0.8rem;
        color: var(--text-muted, #94a3b8);
    }
    .rate-badge {
        display: inline-block;
        padding: 0.25rem 0.5rem;
        border-radius: 0.5rem;
        font-weight: 600;
        font-size: 0.875rem;
    }
    .rate-excellent { background: rgba(34,197,94,0.15); color: #22c55e; }
    .rate-good      { background: rgba(234,179,8,0.15); color: #eab308; }
    .rate-poor      { background: rgba(239,68,68,0.15); color: #ef4444; }
</style>

@code {
    [Parameter] public Guid GroupId { get; set; }
    private List<PlayerAttendanceStats>? stats;
    private List<PlayerAttendanceStats> sortedStats = new();
    private string? errorMessage;
    private string sortColumn = "confirmed";
    private bool sortDesc = true;
    private int TotalSessions => stats?.Count > 0 ? (int)(stats.Max(s => s.TotalSessions)) : 0;
    private int AvgAttendanceRate => stats?.Count > 0 ? (int)(stats.Average(s => s.AttendanceRate)) : 0;
    private PlayerAttendanceStats? topPlayer => stats?.OrderByDescending(s => s.AttendanceRate).ThenByDescending(s => s.ConfirmedCount).FirstOrDefault();

    protected override async Task OnInitializedAsync()
    {
        var authState = await AuthStateProvider.GetAuthenticationStateAsync();
        var user = authState.User;
        if (!user.Identity?.IsAuthenticated ?? true)
        {
            Navigation.NavigateTo("/login");
            return;
        }
        if (!user.TryGetPlatformIdentity(out var platform, out var externalUserId))
        {
            Navigation.NavigateTo("/login");
            return;
        }
        try
        {
            var groupManagement = await SessionService.GetGroupManagementForCurrentUserAsync(GroupId);
            if (groupManagement is null)
            {
                Navigation.NavigateTo("/access-denied");
                return;
            }
            stats = await SessionService.GetGroupAttendanceStatsForCurrentUserAsync(GroupId) ?? new();
            UpdateSortedStats();
        }
        catch (Exception ex)
        {
            errorMessage = $"Ошибка загрузки статистики: {ex.Message}";
        }
    }

    private void SortBy(string column)
    {
        if (sortColumn == column)
            sortDesc = !sortDesc;
        else
        {
            sortColumn = column;
            sortDesc = true;
        }
        UpdateSortedStats();
    }

    private void UpdateSortedStats()
    {
        if (stats is null) { sortedStats = new(); return; }
        IOrderedEnumerable<PlayerAttendanceStats> ordered = sortColumn switch
        {
            "player" => sortDesc ? stats.OrderByDescending(s => s.DisplayName) : stats.OrderBy(s => s.DisplayName),
            "total" => sortDesc ? stats.OrderByDescending(s => s.TotalSessions) : stats.OrderBy(s => s.TotalSessions),
            "confirmed" => sortDesc ? stats.OrderByDescending(s => s.ConfirmedCount) : stats.OrderBy(s => s.ConfirmedCount),
            "declined" => sortDesc ? stats.OrderByDescending(s => s.DeclinedCount) : stats.OrderBy(s => s.DeclinedCount),
            "noresponse" => sortDesc ? stats.OrderByDescending(s => s.NoResponseCount) : stats.OrderBy(s => s.NoResponseCount),
            "waitlist" => sortDesc ? stats.OrderByDescending(s => s.WaitlistedCount) : stats.OrderBy(s => s.WaitlistedCount),
            "rate" => sortDesc ? stats.OrderByDescending(s => s.AttendanceRate) : stats.OrderBy(s => s.AttendanceRate),
            "cancelled" => sortDesc ? stats.OrderByDescending(s => s.CancellationAffectedCount) : stats.OrderBy(s => s.CancellationAffectedCount),
            _ => stats.OrderByDescending(s => s.ConfirmedCount)
        };
        sortedStats = ordered.ToList();
    }

    private string SortIndicator(string column) => sortColumn == column ? (sortDesc ? "▼" : "▲") : "";

    private string AttendanceBadgeClass(decimal rate) => rate switch
    {
        >= 75m => "rate-excellent",
        >= 50m => "rate-good",
        _ => "rate-poor"
    };
}