@extends('layouts.app')

@section('title', 'Attendance - ' . ($class->subject->title ?? 'Class'))

@section('content')
<div class="container-fluid">
    <div class="card shadow-sm border-0 rounded-3">
        <div class="card-header bg-success text-white d-flex justify-content-between align-items-center">
            <h4 class="mb-0">
                <i class="fas fa-calendar-check me-2"></i>
                Attendance — {{ $class->subject->title ?? '—' }} ({{ $class->batch->name ?? '—' }})
            </h4>
            <div>
                <a href="{{ route('teachers.classes', $teacher->id) }}" class="btn btn-light btn-sm me-2">
                    <i class="fas fa-arrow-left"></i> Back to Classes
                </a>
                <a href="{{ route('batch-subjects.show', $class->id) }}" class="btn btn-info btn-sm">
                    <i class="fas fa-info-circle"></i> Class Details
                </a>
            </div>
        </div>

        <div class="card-body">
            <!-- Class Information -->
            <div class="row mb-4">
                <div class="col-md-6">
                    <table class="table table-sm table-borderless">
                        <tr>
                            <th width="30%">Teacher:</th>
                            <td>{{ $teacher->user->name }}</td>
                        </tr>
                        <tr>
                            <th>Batch:</th>
                            <td>{{ $class->batch->name }} ({{ $class->batch->code ?? 'No Code' }})</td>
                        </tr>
                        <tr>
                            <th>Room:</th>
                            <td>{{ $class->room->name ?? 'Not assigned' }} {{ $class->room->number ? '(' . $class->room->number . ')' : '' }}</td>
                        </tr>
                    </table>
                </div>
                <div class="col-md-6">
                    <table class="table table-sm table-borderless">
                        <tr>
                            <th width="30%">Subject:</th>
                            <td>{{ $class->subject->title }} ({{ $class->subject->code ?? 'No Code' }})</td>
                        </tr>
                        <tr>
                            <th>Semester:</th>
                            <td>{{ $class->semester }}</td>
                        </tr>
                        <tr>
                            <th>Weekly Hours:</th>
                            <td>{{ $class->weekly_hours }} hours</td>
                        </tr>
                    </table>
                </div>
            </div>

            {{-- ⚙️ Attendance Form --}}
            <form action="{{ route('attendance.take', ['class' => $class->id]) }}" method="POST">
                @csrf

                {{-- 📅 Session Date --}}
                <div class="row mb-4">
                    <div class="col-md-4">
                        <label for="session_date" class="form-label fw-bold">Session Date *</label>
                        <input type="date" name="session_date" id="session_date"
                               class="form-control @error('session_date') is-invalid @enderror"
                               value="{{ old('session_date', now()->toDateString()) }}" required>
                        @error('session_date')
                            <div class="invalid-feedback">{{ $message }}</div>
                        @enderror
                    </div>
                    <div class="col-md-8 d-flex align-items-end">
                        <div class="form-text">
                            <i class="fas fa-info-circle text-primary me-1"></i>
                            Select the date for this attendance session
                        </div>
                    </div>
                </div>

                {{-- 👥 Student List --}}
                <div class="table-responsive">
                    <table class="table table-bordered align-middle text-center">
                        <thead class="table-dark">
                            <tr>
                                <th width="5%">#</th>
                                <th width="35%">Student Name</th>
                                <th width="20%">Student ID</th>
                                <th width="40%">Attendance Status</th>
                            </tr>
                        </thead>
                        <tbody>
                            @forelse($students as $student)
                                <tr>
                                    <td>{{ $loop->iteration }}</td>
                                    <td class="text-start">
                                        <strong>{{ $student->name }}</strong>
                                        @if($student->email)
                                            <br><small class="text-muted">{{ $student->email }}</small>
                                        @endif
                                    </td>
                                    <td>
                                        {{ $student->institute_id ?? '—' }}
                                        @if($student->roll_number)
                                            <br><small class="text-muted">Roll: {{ $student->roll_number }}</small>
                                        @endif
                                    </td>
                                    <td>
                                        <div class="d-flex justify-content-center gap-3">
                                            <div class="form-check form-check-inline">
                                                <input class="form-check-input" type="radio"
                                                       name="attendance[{{ $loop->index }}][status]"
                                                       id="present_{{ $student->id }}"
                                                       value="present" checked>
                                                <label class="form-check-label text-success fw-bold" for="present_{{ $student->id }}">
                                                    <i class="fas fa-check me-1"></i>Present
                                                </label>
                                            </div>
                                            <div class="form-check form-check-inline">
                                                <input class="form-check-input" type="radio"
                                                       name="attendance[{{ $loop->index }}][status]"
                                                       id="absent_{{ $student->id }}"
                                                       value="absent">
                                                <label class="form-check-label text-danger fw-bold" for="absent_{{ $student->id }}">
                                                    <i class="fas fa-times me-1"></i>Absent
                                                </label>
                                            </div>
                                        </div>
                                        <input type="hidden" name="attendance[{{ $loop->index }}][student_id]"
                                               value="{{ $student->id }}">
                                    </td>
                                </tr>
                            @empty
                                <tr>
                                    <td colspan="4" class="text-center py-4">
                                        <i class="fas fa-users fa-2x text-muted mb-3"></i>
                                        <h5 class="text-muted">No students found</h5>
                                        <p class="text-muted">No students are enrolled in this batch.</p>
                                        <a href="{{ route('batch-students.create') }}" class="btn btn-primary">
                                            <i class="fas fa-user-plus me-1"></i> Enroll Students
                                        </a>
                                    </td>
                                </tr>
                            @endforelse
                        </tbody>
                    </table>
                </div>

                @if($students->count())
                    <div class="mt-4 text-end">
                        <button type="reset" class="btn btn-secondary me-2">
                            <i class="fas fa-redo me-1"></i> Reset
                        </button>
                        <button type="submit" class="btn btn-primary">
                            <i class="fas fa-save me-1"></i> Save Attendance
                        </button>
                    </div>
                @endif
            </form>

            {{-- 📊 Previous Attendance Sessions --}}
            @if($attendanceSessions->count())
                <hr class="my-5">
                <h5 class="fw-bold mb-3">
                    <i class="fas fa-history me-2 text-primary"></i>Previous Attendance Sessions
                </h5>
                <div class="table-responsive">
                    <table class="table table-striped text-center align-middle">
                        <thead class="table-light">
                            <tr>
                                <th>Date</th>
                                <th>Total Students</th>
                                <th>Present</th>
                                <th>Absent</th>
                                <th>Actions</th>
                            </tr>
                        </thead>
                        <tbody>
                            @foreach($attendanceSessions as $session)
                                @php
                                    $counts = $session->attendanceEntries
                                        ->groupBy('status')
                                        ->map(fn($s) => $s->count());
                                    $presentCount = $counts['present'] ?? 0;
                                    $absentCount = $counts['absent'] ?? 0;
                                    $totalCount = $presentCount + $absentCount;
                                @endphp
                                <tr>
                                    <td>
                                        <strong>{{ \Carbon\Carbon::parse($session->session_date)->format('M d, Y') }}</strong>
                                        <br>
                                        <small class="text-muted">{{ \Carbon\Carbon::parse($session->session_date)->format('l') }}</small>
                                    </td>
                                    <td>
                                        <span class="badge bg-primary">{{ $totalCount }}</span>
                                    </td>
                                    <td>
                                        <span class="badge bg-success">{{ $presentCount }}</span>
                                        @if($totalCount > 0)
                                            <br><small class="text-muted">{{ number_format(($presentCount/$totalCount)*100, 1) }}%</small>
                                        @endif
                                    </td>
                                    <td>
                                        <span class="badge bg-danger">{{ $absentCount }}</span>
                                        @if($totalCount > 0)
                                            <br><small class="text-muted">{{ number_format(($absentCount/$totalCount)*100, 1) }}%</small>
                                        @endif
                                    </td>
                                    <td>
                                        <button class="btn btn-sm btn-outline-primary" 
                                                onclick="alert('View details for {{ $session->session_date }}')">
                                            <i class="fas fa-eye"></i> View
                                        </button>
                                    </td>
                                </tr>
                            @endforeach
                        </tbody>
                    </table>
                    {{ $attendanceSessions->links() }}
                </div>
            @else
                <div class="text-center py-4">
                    <i class="fas fa-clipboard-list fa-2x text-muted mb-3"></i>
                    <h5 class="text-muted">No attendance records yet</h5>
                    <p class="text-muted">Take attendance to see the history here.</p>
                </div>
            @endif
        </div>
    </div>
</div>
@endsection

@push('styles')
<style>
.table td, .table th { 
    vertical-align: middle; 
}
.form-check-inline { 
    margin-right: 1rem; 
}
.card-header {
    border-bottom: none;
}
</style>
@endpush

@push('scripts')
<script>
$(document).ready(function() {
    // Auto-select today's date if not set
    if (!$('#session_date').val()) {
        $('#session_date').val(new Date().toISOString().split('T')[0]);
    }

    // Prevent future dates
    $('#session_date').attr('max', new Date().toISOString().split('T')[0]);

    // Quick select all present
    $('#selectAllPresent').on('click', function() {
        $('input[value="present"]').prop('checked', true);
    });

    // Quick select all absent
    $('#selectAllAbsent').on('click', function() {
        $('input[value="absent"]').prop('checked', true);
    });
});
</script>
@endpush