@extends('layouts.applicant.applicant')

@section('head')
<meta name="csrf-token" content="{{ csrf_token() }}">
@endsection

@section('title', 'D15 - Theory Teaching')

@section('breadcrumbs')
    <li class="breadcrumb-item"><a href="{{ route('applicant.applications.index') }}">My Applications</a></li>
    <li class="breadcrumb-item"><a href="{{ route('applicant.applications.show', $application) }}">{{ $application->application_number }}</a></li>
    <li class="breadcrumb-item active">D15 - Theory Teaching</li>
@endsection

@section('content')
<div class="container-fluid">
    <!-- Page Header -->
    <div class="d-flex justify-content-between align-items-center mb-4">
        <div>
            <h1 class="h3 mb-0 text-gray-800">Theory Teaching (Over and above 6 credit hours)</h1>
            <p class="text-muted">Application: {{ $application->application_number }}</p>
        </div>
        <div>
            @php
                $previousStep = $currentStep->getPreviousStep();
            @endphp
            @if($previousStep)
                <a href="{{ route('applicant.applications.step', [$application, $previousStep->slug]) }}" class="btn btn-outline-secondary">
                    <i class="fas fa-arrow-left me-2"></i>Previous Step
                </a>
            @endif
        </div>
    </div>

    <!-- Dynamic Progress Indicator -->
    @include('applicant.applications.partials.progress-indicator')

    @php
        $theoryTeachings = $application->theoryTeachings()->orderBy('serial_no')->get();
        $totalCreditPoints = $theoryTeachings->sum('credit_points');
        $evaluationPoints = min($totalCreditPoints, 6); // Max 6 for evaluation
        $totalTeachingPeriods = $theoryTeachings->count();
        $totalTeachingHours = $theoryTeachings->sum('teaching_load_hours');
        $totalExtraHours = $theoryTeachings->sum('total_extra_teaching');
        $eligiblePeriods = $theoryTeachings->where('total_extra_teaching', '>', 6)->count();
    @endphp

    <!-- No Theory Teaching Option -->
    <div class="card shadow mb-4">
        <div class="card-header py-3">
            <h6 class="m-0 font-weight-bold text-warning">
                <i class="fas fa-exclamation-triangle me-2"></i>No Theory Teaching Declaration
            </h6>
        </div>
        <div class="card-body">
            <div class="form-check">
                <input class="form-check-input" type="checkbox" id="no_theory_teaching" 
                       {{ $application->no_theory_teaching ? 'checked' : '' }}
                       @if(!$application->isEditable()) disabled @endif
                       onchange="toggleNoTheoryTeaching()">
                <label class="form-check-label fw-bold" for="no_theory_teaching">
                    I have No Theory Teaching Over and Above 6 Credit Hours
                </label>
                <div class="form-text">
                    Check this box if you have no theory teaching over and above 6 credit hours to add.
                    This step is non-mandatory to fill.
                </div>
            </div>
        </div>
    </div>

    @if(!$application->no_theory_teaching)
    <!-- Credit Points Summary -->
    <div class="row mb-4">
        <div class="col-md-3">
            <div class="card border-primary">
                <div class="card-body text-center">
                    <div class="h4 text-primary">{{ number_format($totalCreditPoints, 2) }}</div>
                    <div class="small text-muted">Total Credit Points</div>
                </div>
            </div>
        </div>
        <div class="col-md-3">
            <div class="card border-success">
                <div class="card-body text-center">
                    <div class="h4 text-success">{{ number_format($evaluationPoints, 2) }}</div>
                    <div class="small text-muted">Maximum Credit Points (Max 6)</div>
                </div>
            </div>
        </div>
        <div class="col-md-3">
            <div class="card border-info">
                <div class="card-body text-center">
                    <div class="h4 text-info">{{ $totalTeachingPeriods }}</div>
                    <div class="small text-muted">Total Teaching Periods</div>
                </div>
            </div>
        </div>
        <div class="col-md-3">
            <div class="card border-secondary">
                <div class="card-body text-center">
                    <div class="h4 text-secondary">{{ number_format($totalExtraHours, 2) }}</div>
                    <div class="small text-muted">Total Extra Hours</div>
                </div>
            </div>
        </div>
    </div>

    <!-- Credit Points Calculation Info -->
    <div class="alert alert-info mb-4">
        <h6 class="alert-heading"><i class="fas fa-info-circle me-2"></i>Credit Points Calculation</h6>
        <div class="row">
            <div class="col-md-6">
                <strong>Credit Points per Hour:</strong> 1 Point (over and above 6 credit hours)
            </div>
            <div class="col-md-6">
                <strong>Eligible Teaching Periods:</strong> {{ $eligiblePeriods }} / {{ $totalTeachingPeriods }}
            </div>
        </div>
        <hr>
        <div class="alert alert-warning mb-0">
            <strong>Important:</strong> 
            <ul class="mb-0">
                <li>Maximum 6 credit points can be used for further calculation</li>
                <li>Only teaching hours over and above 6 credit hours are eligible</li>
                <li>1 credit point per hour over the minimum 6 hours</li>
                <li>This step is non-mandatory to fill</li>
                <li>Upload proof documents for verification</li>
            </ul>
        </div>
    </div>

    <!-- Theory Teaching Section -->
    <div class="card shadow mb-4" id="theoryTeachingSection">
        <div class="card-header py-3">
            <div class="d-flex justify-content-between align-items-center">
                <h6 class="m-0 font-weight-bold text-primary">
                    <i class="fas fa-chalkboard me-2"></i>Theory Teaching Details
                </h6>
                @if($application->isEditable())
                <button type="button" class="btn btn-primary btn-sm" data-bs-toggle="modal" data-bs-target="#addTheoryTeachingModal">
                    <i class="fas fa-plus me-1"></i>Add Teaching Period
                </button>
                @endif
            </div>
        </div>
        <div class="card-body">
            @if($theoryTeachings->count() > 0)
                <div class="table-responsive">
                    <table class="table table-bordered">
                        <thead class="table-light">
                            <tr>
                                <th>Sr. No</th>
                                <th>Academic Year</th>
                                <th>Semester</th>
                                <th>Teaching Load (Hours)</th>
                                <th>Extra Teaching (Hours)</th>
                                <th>Eligible Hours</th>
                                <th>Credit Points</th>
                                <th>Proof Document</th>
                                @if($application->isEditable())
                                <th>Actions</th>
                                @endif
                            </tr>
                        </thead>
                        <tbody>
                            @foreach($theoryTeachings as $teaching)
                            <tr>
                                <td>{{ $teaching->serial_no }}</td>
                                <td class="fw-bold">{{ $teaching->academic_year }}</td>
                                <td>
                                    <span class="badge badge-{{ $teaching->semester === 'odd' ? 'primary' : 'secondary' }}">
                                        {{ $teaching->semester_display }}
                                    </span>
                                </td>
                                <td>{{ number_format($teaching->teaching_load_hours, 2) }}</td>
                                <td>{{ number_format($teaching->total_extra_teaching, 2) }}</td>
                                <td>
                                    @if($teaching->isEligibleForCreditPoints())
                                        <span class="text-success fw-bold">{{ number_format($teaching->extra_hours_above_minimum, 2) }}</span>
                                    @else
                                        <span class="text-danger">0 (≤6 hours)</span>
                                    @endif
                                </td>
                                <td class="fw-bold text-primary">{{ number_format($teaching->credit_points, 2) }}</td>
                                <td>
                                    @if($teaching->hasDocument())
                                        <a href="{{ route('applicant.theory-teachings.download-document', [$application, $teaching]) }}" 
                                           class="btn btn-sm btn-outline-primary" title="Download Document">
                                            <i class="fas fa-download"></i>
                                        </a>
                                    @else
                                        <span class="text-danger">No Document</span>
                                    @endif
                                </td>
                                @if($application->isEditable())
                                <td>
                                    <div class="btn-group" role="group">
                                        <button type="button" class="btn btn-sm btn-outline-primary" 
                                                onclick="editTheoryTeaching({{ $teaching->id }})" title="Edit">
                                            <i class="fas fa-edit"></i>
                                        </button>
                                        <button type="button" class="btn btn-sm btn-outline-danger" 
                                                onclick="deleteTheoryTeaching({{ $teaching->id }})" title="Delete">
                                            <i class="fas fa-trash"></i>
                                        </button>
                                    </div>
                                </td>
                                @endif
                            </tr>
                            @endforeach
                        </tbody>
                    </table>
                </div>
                
                <!-- Summary -->
                <div class="mt-4">
                    <div class="row">
                        <div class="col-md-6">
                            <div class="card border-info">
                                <div class="card-body">
                                    <h6 class="card-title text-info">Teaching Summary</h6>
                                    <p class="mb-1"><strong>Total Periods:</strong> {{ $totalTeachingPeriods }}</p>
                                    <p class="mb-1"><strong>Total Hours:</strong> {{ number_format($totalTeachingHours, 2) }}</p>
                                    <p class="mb-0"><strong>Extra Hours:</strong> {{ number_format($totalExtraHours, 2) }}</p>
                                </div>
                            </div>
                        </div>
                        <div class="col-md-6">
                            <div class="card border-secondary">
                                <div class="card-body">
                                    <h6 class="card-title text-secondary">Evaluation</h6>
                                    <p class="mb-1"><strong>Total Credit Points:</strong> {{ number_format($totalCreditPoints, 2) }}</p>
                                    <p class="mb-1"><strong>Evaluation Points:</strong> {{ number_format($evaluationPoints, 2) }} / 6</p>
                                    @if($totalCreditPoints > 6)
                                        <p class="mb-0 text-warning"><strong>Note:</strong> Total exceeds 6, capped at 6 for evaluation</p>
                                    @else
                                        <p class="mb-0 text-success"><strong>Status:</strong> Within evaluation limit</p>
                                    @endif
                                </div>
                            </div>
                        </div>
                    </div>
                </div>
            @else
                <div class="text-center py-5">
                    <i class="fas fa-chalkboard fa-4x text-muted mb-3"></i>
                    <h5 class="text-muted">No Theory Teaching Records Added</h5>
                    <p class="text-muted">Add your theory teaching records over and above 6 credit hours to earn credit points.</p>
                    @if($application->isEditable())
                        <button type="button" class="btn btn-primary" data-bs-toggle="modal" data-bs-target="#addTheoryTeachingModal">
                            <i class="fas fa-plus me-2"></i>Add First Teaching Record
                        </button>
                    @endif
                </div>
            @endif
        </div>
    </div>
    @endif

    <!-- Navigation -->
    <div class="d-flex justify-content-between mt-4">
        <div>
            @if($previousStep)
                <a href="{{ route('applicant.applications.step', [$application, $previousStep->slug]) }}" class="btn btn-secondary">
                    <i class="fas fa-arrow-left me-1"></i>Previous: {{ $previousStep->name }}
                </a>
            @endif
        </div>
        
        <div>
            @php
                $nextStep = $currentStep->getNextStep();
            @endphp
            @if($nextStep)
                <a href="{{ route('applicant.applications.step', [$application, $nextStep->slug]) }}" class="btn btn-primary">
                    Next: {{ $nextStep->name }} <i class="fas fa-arrow-right ms-1"></i>
                </a>
            @endif
        </div>
    </div>
</div>

<!-- Add/Edit Theory Teaching Modal -->
@if($application->isEditable())
<div class="modal fade" id="addTheoryTeachingModal" tabindex="-1" aria-labelledby="addTheoryTeachingModalLabel" aria-hidden="true">
    <div class="modal-dialog modal-xl">
        <div class="modal-content">
            <div class="modal-header">
                <h5 class="modal-title" id="addTheoryTeachingModalLabel">Add Theory Teaching</h5>
                <button type="button" class="btn-close" data-bs-dismiss="modal" aria-label="Close"></button>
            </div>
            <form id="theoryTeachingForm" method="POST" enctype="multipart/form-data">
                @csrf
                <div class="modal-body">
                    <input type="hidden" id="theory_teaching_id" name="theory_teaching_id">
                    
                    <div class="row">
                        <div class="col-md-6">
                            <div class="mb-3">
                                <label for="academic_year" class="form-label">Academic Year <span class="text-danger">*</span></label>
                                <input type="text" class="form-control" id="academic_year" name="academic_year" 
                                       placeholder="e.g., 2023-24" required>
                                <small class="text-muted">Format: YYYY-YY (e.g., 2023-24)</small>
                            </div>
                        </div>
                        <div class="col-md-6">
                            <div class="mb-3">
                                <label for="semester" class="form-label">Semester <span class="text-danger">*</span></label>
                                <select class="form-select" id="semester" name="semester" required>
                                    <option value="">Select Semester</option>
                                    <option value="odd">Odd Semester</option>
                                    <option value="even">Even Semester</option>
                                </select>
                                <small class="text-muted">Select the semester type</small>
                            </div>
                        </div>
                    </div>
                    
                    <div class="row">
                        <div class="col-md-6">
                            <div class="mb-3">
                                <label for="teaching_load_hours" class="form-label">Teaching Load (Hours) <span class="text-danger">*</span></label>
                                <input type="number" class="form-control" id="teaching_load_hours" name="teaching_load_hours" 
                                       step="0.01" min="0" required onchange="calculateCreditPoints()">
                                <small class="text-muted">Total teaching load in hours</small>
                            </div>
                        </div>
                        <div class="col-md-6">
                            <div class="mb-3">
                                <label for="total_extra_teaching" class="form-label">Total Extra Teaching (Hours) <span class="text-danger">*</span></label>
                                <input type="number" class="form-control" id="total_extra_teaching" name="total_extra_teaching" 
                                       step="0.01" min="0" required onchange="calculateCreditPoints()">
                                <small class="text-muted">Total extra teaching hours (including the 6 base hours)</small>
                            </div>
                        </div>
                    </div>
                    
                    <div class="row">
                        <div class="col-md-6">
                            <div class="mb-3">
                                <label class="form-label">Eligible Hours (Auto-calculated)</label>
                                <div class="input-group">
                                    <input type="number" class="form-control" id="eligible_hours_display" readonly>
                                    <span class="input-group-text">
                                        <i class="fas fa-calculator"></i>
                                    </span>
                                </div>
                                <small class="text-muted" id="eligible_hours_info">
                                    Hours over and above 6 credit hours
                                </small>
                            </div>
                        </div>
                        <div class="col-md-6">
                            <div class="mb-3">
                                <label class="form-label">Credit Points (Auto-calculated)</label>
                                <div class="input-group">
                                    <input type="number" class="form-control" id="credit_points_display" readonly>
                                    <span class="input-group-text">
                                        <i class="fas fa-star"></i>
                                    </span>
                                </div>
                                <small class="text-muted" id="credit_points_info">
                                    1 credit point per eligible hour
                                </small>
                            </div>
                        </div>
                    </div>
                    
                    <div class="mb-3">
                        <label for="proof_document" class="form-label">Upload Proof Document (PDF) <span class="text-danger">*</span></label>
                        <input type="file" class="form-control" id="proof_document" name="proof_document" accept=".pdf">
                        <small class="text-muted">Upload teaching load certificate or relevant document (PDF only, max 5MB)</small>
                    </div>
                </div>
                <div class="modal-footer">
                    <button type="button" class="btn btn-secondary" data-bs-dismiss="modal">Cancel</button>
                    <button type="submit" class="btn btn-primary">Save Teaching Record</button>
                </div>
            </form>
        </div>
    </div>
</div>
@endif

<script>
function toggleNoTheoryTeaching() {
    const checkbox = document.getElementById('no_theory_teaching');
    const theoryTeachingSection = document.getElementById('theoryTeachingSection');
    
    if (checkbox.checked) {
        theoryTeachingSection.style.display = 'none';
        updateNoTheoryTeachingStatus(true);
    } else {
        theoryTeachingSection.style.display = 'block';
        updateNoTheoryTeachingStatus(false);
    }
}

function updateNoTheoryTeachingStatus(noTheoryTeaching) {
    fetch(`{{ route("applicant.applications.update-no-theory-teaching", $application) }}`, {
        method: 'POST',
        headers: {
            'X-CSRF-TOKEN': document.querySelector('meta[name="csrf-token"]').getAttribute('content'),
            'Content-Type': 'application/json',
        },
        body: JSON.stringify({
            no_theory_teaching: noTheoryTeaching
        })
    })
    .then(response => response.json())
    .then(data => {
        if (!data.success) {
            console.error('Error updating no theory teaching status');
        }
    })
    .catch(error => {
        console.error('Error:', error);
    });
}

function calculateCreditPoints() {
    const totalExtraHours = parseFloat(document.getElementById('total_extra_teaching').value) || 0;
    const eligibleHours = Math.max(0, totalExtraHours - 6); // Over and above 6 hours
    const creditPoints = eligibleHours; // 1 point per hour
    
    document.getElementById('eligible_hours_display').value = eligibleHours.toFixed(2);
    document.getElementById('credit_points_display').value = creditPoints.toFixed(2);
    
    const eligibleInfo = document.getElementById('eligible_hours_info');
    const creditInfo = document.getElementById('credit_points_info');
    
    if (eligibleHours > 0) {
        eligibleInfo.innerHTML = `${eligibleHours.toFixed(2)} hours over the minimum 6 hours`;
        eligibleInfo.className = 'text-success';
        creditInfo.innerHTML = `${creditPoints.toFixed(2)} credit points (1 per hour)`;
        creditInfo.className = 'text-success';
    } else {
        eligibleInfo.innerHTML = 'No eligible hours (must be > 6 hours)';
        eligibleInfo.className = 'text-danger';
        creditInfo.innerHTML = 'No credit points earned';
        creditInfo.className = 'text-danger';
    }
}

function editTheoryTeaching(teachingId) {
    // Fetch teaching data and populate modal
    fetch(`{{ route("applicant.theory-teachings.show", [$application, "TEACHING_ID"]) }}`.replace('TEACHING_ID', teachingId), {
        headers: {
            'Accept': 'application/json',
            'X-CSRF-TOKEN': document.querySelector('meta[name="csrf-token"]').getAttribute('content')
        }
    })
    .then(response => response.json())
    .then(data => {
        document.getElementById('theory_teaching_id').value = data.id;
        document.getElementById('academic_year').value = data.academic_year;
        document.getElementById('semester').value = data.semester;
        document.getElementById('teaching_load_hours').value = data.teaching_load_hours;
        document.getElementById('total_extra_teaching').value = data.total_extra_teaching;
        
        calculateCreditPoints();
        
        document.getElementById('addTheoryTeachingModalLabel').textContent = 'Edit Theory Teaching';
        document.getElementById('proof_document').required = false; // Not required for edit
        
        // Show modal
        new bootstrap.Modal(document.getElementById('addTheoryTeachingModal')).show();
    })
    .catch(error => {
        console.error('Error:', error);
        alert('Error loading teaching data');
    });
}

function deleteTheoryTeaching(teachingId) {
    if (confirm('Are you sure you want to delete this theory teaching record?')) {
        fetch(`{{ route("applicant.theory-teachings.destroy", [$application, "TEACHING_ID"]) }}`.replace('TEACHING_ID', teachingId), {
            method: 'DELETE',
            headers: {
                'X-CSRF-TOKEN': document.querySelector('meta[name="csrf-token"]').getAttribute('content'),
            },
        })
        .then(response => response.json())
        .then(data => {
            if (data.success) {
                location.reload();
            } else {
                alert('Error deleting theory teaching record');
            }
        })
        .catch(error => {
            console.error('Error:', error);
            alert('Error deleting theory teaching record');
        });
    }
}

// Reset modal when opening for new teaching record
document.querySelector('[data-bs-target="#addTheoryTeachingModal"]').addEventListener('click', function() {
    document.getElementById('theoryTeachingForm').reset();
    document.getElementById('theory_teaching_id').value = '';
    document.getElementById('addTheoryTeachingModalLabel').textContent = 'Add Theory Teaching';
    document.getElementById('proof_document').required = true;
    document.getElementById('eligible_hours_display').value = '';
    document.getElementById('credit_points_display').value = '';
    document.getElementById('eligible_hours_info').innerHTML = 'Hours over and above 6 credit hours';
    document.getElementById('eligible_hours_info').className = 'text-muted';
    document.getElementById('credit_points_info').innerHTML = '1 credit point per eligible hour';
    document.getElementById('credit_points_info').className = 'text-muted';
});

// Handle form submission
document.getElementById('theoryTeachingForm').addEventListener('submit', function(e) {
    e.preventDefault();
    
    const formData = new FormData(this);
    const teachingId = document.getElementById('theory_teaching_id').value;
    
    // Determine if this is an update or create
    const url = teachingId ? 
        `{{ route('applicant.theory-teachings.update', [$application, '__TEACHING_ID__']) }}`.replace('__TEACHING_ID__', teachingId) :
        `{{ route('applicant.theory-teachings.store', $application) }}`;
    
    if (teachingId) {
        formData.append('_method', 'PUT');
    }
    
    fetch(url, {
        method: 'POST',
        body: formData,
        headers: {
            'X-CSRF-TOKEN': document.querySelector('meta[name="csrf-token"]').getAttribute('content')
        }
    })
    .then(response => {
        if (response.ok) {
            location.reload();
        } else {
            return response.json().then(data => {
                throw new Error(data.message || 'An error occurred');
            });
        }
    })
    .catch(error => {
        alert('Error: ' + error.message);
        console.error('Error:', error);
    });
});

// Initialize page state
document.addEventListener('DOMContentLoaded', function() {
    const checkbox = document.getElementById('no_theory_teaching');
    const theoryTeachingSection = document.getElementById('theoryTeachingSection');
    
    if (checkbox.checked) {
        theoryTeachingSection.style.display = 'none';
    } else {
        theoryTeachingSection.style.display = 'block';
    }
});
</script>

<style>
.card {
    border: none;
    box-shadow: 0 0.15rem 1.75rem 0 rgba(58, 59, 69, 0.15);
}

.card-header {
    background-color: #f8f9fc;
    border-bottom: 1px solid #e3e6f0;
}

.table th {
    background-color: #f8f9fc;
    border-color: #e3e6f0;
    font-weight: 600;
    color: #5a5c69;
    font-size: 0.875rem;
}

.table td {
    vertical-align: middle;
    font-size: 0.875rem;
}

.btn-group .btn {
    margin-right: 2px;
}

.badge {
    font-size: 0.75rem;
    padding: 0.375rem 0.75rem;
}

.badge-primary {
    background-color: #667eea;
    color: white;
}

.badge-secondary {
    background-color: #6c757d;
    color: white;
}

.modal-content {
    border: none;
    box-shadow: 0 0.5rem 1rem rgba(0, 0, 0, 0.15);
}

.alert {
    border: none;
    border-radius: 0.5rem;
}

.form-check-input:checked {
    background-color: #ffc107;
    border-color: #ffc107;
}
</style>
@endsection