@extends('layouts.app')

@section('title', 'Начисления')

{{--
    Ports app/Views/payment/charges.php (legacy, 247 lines) — see the Phase
    15 plan. Read-only, no forms need CSRF (both tabs are GET filter forms).
    The predict tab's simulation never writes to the DB, matching the
    legacy explanatory text below.
--}}

@section('content')
<style>
    [data-bs-toggle="collapse"][aria-expanded="true"] .bi-chevron-down { transform: rotate(180deg); }
    .bi-chevron-down { transition: transform .15s ease; display: inline-block; }
</style>
<div class="container mt-4 pb-5">

    <h2 class="mb-3">Начисления</h2>

    <ul class="nav nav-tabs mb-4">
        <li class="nav-item">
            <a class="nav-link {{ $tab === 'actual' ? 'active' : '' }}" href="?tab=actual">Фактические начисления</a>
        </li>
        <li class="nav-item">
            <a class="nav-link {{ $tab === 'predict' ? 'active' : '' }}" href="?tab=predict">Прогноз начислений</a>
        </li>
    </ul>

    @if ($tab === 'actual')

        <form method="GET" class="row g-2 align-items-end mb-4">
            <input type="hidden" name="tab" value="actual">
            <div class="col-auto">
                <label class="form-label small text-muted mb-1">От</label>
                <input type="date" name="date_from" class="form-control form-control-sm" value="{{ $actualDateFrom }}">
            </div>
            <div class="col-auto">
                <label class="form-label small text-muted mb-1">До</label>
                <input type="date" name="date_to" class="form-control form-control-sm" value="{{ $actualDateTo }}">
            </div>
            <div class="col-auto">
                <label class="form-label small text-muted mb-1">Группа</label>
                <select name="group_id" class="form-select form-select-sm">
                    <option value="">Все</option>
                    @foreach ($groups as $g)
                        <option value="{{ $g->id }}" {{ (string) $groupId === (string) $g->id ? 'selected' : '' }}>
                            {{ $g->group_name }}
                        </option>
                    @endforeach
                </select>
            </div>
            <div class="col-auto">
                <label class="form-label small text-muted mb-1">Ученик</label>
                <input type="text" name="search" class="form-control form-control-sm" placeholder="Имя или фамилия" value="{{ $search }}">
            </div>
            <div class="col-auto">
                <button type="submit" class="btn btn-primary btn-sm">Применить</button>
            </div>
        </form>

        <div class="card border-success shadow-sm mb-4" style="max-width:320px;">
            <div class="card-body">
                <div class="small text-muted">Всего начислено за период</div>
                <div class="fw-bold fs-4 text-success">{{ number_format($actualTotal, 0, ',', ' ') }} &#8376;</div>
                <div class="small text-muted">{{ $actualChargesCount }} начислений, {{ count($actualCharges) }} учеников</div>
            </div>
        </div>

        @if ($actualCharges->isNotEmpty())
            <div class="table-responsive">
                <table class="table table-bordered table-hover align-middle">
                    <thead class="table-light">
                    <tr>
                        <th style="width:2rem;"></th>
                        <th>Ученик</th>
                        <th>Группа</th>
                        <th>Тариф</th>
                        <th class="text-center">Начислений</th>
                        <th class="text-end">Сумма</th>
                    </tr>
                    </thead>
                    <tbody>
                    @foreach ($actualCharges as $c)
                        <tr role="button" data-bs-toggle="collapse" data-bs-target="#charge-details-{{ (int) $c->student_id }}" aria-expanded="false">
                            <td class="text-center text-muted"><i class="bi bi-chevron-down small"></i></td>
                            <td>
                                <a href="/student_admin_info.php?student_id={{ (int) $c->student_id }}" class="text-decoration-none" onclick="event.stopPropagation()">
                                    {{ $c->student_name }}
                                </a>
                            </td>
                            <td>{{ $c->group_names }}</td>
                            <td>{{ $c->tariff_names }}</td>
                            <td class="text-center">{{ $c->charges_count }}</td>
                            <td class="text-end text-success fw-semibold">{{ number_format($c->amount, 0, ',', ' ') }} &#8376;</td>
                        </tr>
                        <tr class="collapse" id="charge-details-{{ (int) $c->student_id }}">
                            <td></td>
                            <td colspan="5" class="p-0">
                                <table class="table table-sm mb-0 bg-light">
                                    <thead>
                                    <tr class="small text-muted">
                                        <th>Дата</th>
                                        <th>Группа</th>
                                        <th>Тариф</th>
                                        <th class="text-end">Сумма</th>
                                    </tr>
                                    </thead>
                                    <tbody>
                                    @foreach ($c->charges as $charge)
                                        <tr>
                                            <td>{{ date('d.m.Y', strtotime($charge->charged_date)) }}</td>
                                            <td>{{ $charge->group_name ?? '—' }}</td>
                                            <td>{{ preg_replace('/^\[manual\]\s*/', '', $charge->tariff_name ?? '—') }}</td>
                                            <td class="text-end">{{ number_format((float) $charge->amount, 2, ',', ' ') }} &#8376;</td>
                                        </tr>
                                    @endforeach
                                    </tbody>
                                </table>
                            </td>
                        </tr>
                    @endforeach
                    </tbody>
                    <tfoot class="table-secondary fw-bold">
                    <tr>
                        <td colspan="5">Итого</td>
                        <td class="text-end text-success">{{ number_format($actualTotal, 0, ',', ' ') }} &#8376;</td>
                    </tr>
                    </tfoot>
                </table>
            </div>
        @else
            <div class="alert alert-light text-muted">Начислений за выбранный период не найдено.</div>
        @endif

    @else

        <form method="GET" class="row g-2 align-items-end mb-4">
            <input type="hidden" name="tab" value="predict">
            <div class="col-auto">
                <label class="form-label small text-muted mb-1">От</label>
                <input type="date" name="predict_from" class="form-control form-control-sm" value="{{ $predictDateFrom }}">
            </div>
            <div class="col-auto">
                <label class="form-label small text-muted mb-1">До</label>
                <input type="date" name="predict_to" class="form-control form-control-sm" value="{{ $predictDateTo }}">
            </div>
            <div class="col-auto">
                <button type="submit" class="btn btn-primary btn-sm">Рассчитать</button>
            </div>
        </form>

        <p class="text-muted small">
            Прогноз симулирует расписание и тарифы (индивидуальный &gt; общий &gt; групповой) за выбранный период,
            учитывая заморозки и окончание индивидуальных пакетов уроков. В базу данных ничего не записывается.
        </p>

        @if ($predictError)
            <div class="alert alert-danger">{{ $predictError }}</div>
        @elseif ($prediction !== null)

            <div class="row g-3 mb-4">
                <div class="col-md-4">
                    <div class="card border-success shadow-sm h-100">
                        <div class="card-body">
                            <div class="small text-muted">Прогноз начислений за период</div>
                            <div class="fw-bold fs-4 text-success">{{ number_format($prediction['total'], 0, ',', ' ') }} &#8376;</div>
                            <div class="small text-muted">{{ $prediction['lessons_count'] }} уроков</div>
                        </div>
                    </div>
                </div>
            </div>

            @if (!empty($prediction['exhausted_warnings']))
                <div class="alert alert-warning">
                    <strong>Индивидуальные тарифы закончатся в этом периоде:</strong>
                    <ul class="mb-0">
                        @foreach ($prediction['exhausted_warnings'] as $w)
                            <li>{{ $w }}</li>
                        @endforeach
                    </ul>
                </div>
            @endif

            @if (!empty($prediction['missing_tariff_warnings']))
                <div class="alert alert-danger">
                    <strong>Нет тарифа (уроки не будут начислены):</strong>
                    <ul class="mb-0">
                        @foreach ($prediction['missing_tariff_warnings'] as $w)
                            <li>
                                {{ $w['student_name'] }} ({{ $w['group_name'] }})
                                — {{ (int) $w['count'] }} урок(ов) без тарифа
                            </li>
                        @endforeach
                    </ul>
                </div>
            @endif

            <div class="row">
                <div class="col-md-6">
                    <div class="card shadow-sm mb-4">
                        <div class="card-header"><strong>По группам</strong></div>
                        <div class="table-responsive">
                            <table class="table table-hover align-middle mb-0">
                                <thead class="table-light">
                                <tr>
                                    <th>Группа</th>
                                    <th class="text-center">Уроков</th>
                                    <th class="text-end">Сумма</th>
                                </tr>
                                </thead>
                                <tbody>
                                @if (empty($prediction['by_group']))
                                    <tr><td colspan="3" class="text-center text-muted py-3">Нет данных</td></tr>
                                @else
                                    @foreach ($prediction['by_group'] as $g)
                                        <tr>
                                            <td>{{ $g['group_name'] }}</td>
                                            <td class="text-center">{{ $g['lessons'] }}</td>
                                            <td class="text-end text-success">{{ number_format($g['amount'], 0, ',', ' ') }} &#8376;</td>
                                        </tr>
                                    @endforeach
                                @endif
                                </tbody>
                            </table>
                        </div>
                    </div>
                </div>
                <div class="col-md-6">
                    <div class="card shadow-sm mb-4">
                        <div class="card-header"><strong>По дням</strong></div>
                        <div class="table-responsive" style="max-height:400px; overflow-y:auto;">
                            <table class="table table-hover align-middle mb-0">
                                <thead class="table-light">
                                <tr>
                                    <th>Дата</th>
                                    <th class="text-end">Сумма</th>
                                </tr>
                                </thead>
                                <tbody>
                                @if (empty($prediction['by_day']))
                                    <tr><td colspan="2" class="text-center text-muted py-3">Нет данных</td></tr>
                                @else
                                    @foreach ($prediction['by_day'] as $row)
                                        <tr>
                                            <td>{{ date('d.m.Y', strtotime($row['date'])) }}</td>
                                            <td class="text-end text-success">{{ number_format($row['amount'], 0, ',', ' ') }} &#8376;</td>
                                        </tr>
                                    @endforeach
                                @endif
                                </tbody>
                            </table>
                        </div>
                    </div>
                </div>
            </div>

        @endif

    @endif

</div>
@endsection