@extends('layouts.applicant.applicant')

@section('title', 'D13 - Service Length')

@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">D13 - Service Length</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">Service Length (Length of service over and above the relevant minimum teaching experience required for a given cadre.)</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
        $serviceLengths = $application->serviceLengths()->orderBy('serial_no')->get();
        $totalCreditPoints = $serviceLengths->sum('credit_points');
        $evaluationPoints = min($totalCreditPoints, 10); // Max 10 for evaluation
        $totalSemesters = $serviceLengths->sum('number_of_semesters');
        $totalYears = round($totalSemesters / 2, 2);
        $totalServicePeriods = $serviceLengths->count();
    @endphp

    <!-- No Experience 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 Experience Declaration
            </h6>
        </div>
        <div class="card-body">
            <div class="form-check">
                <input class="form-check-input" type="checkbox" id="no_service_experience" 
                       {{ $application->no_service_experience ? 'checked' : '' }}
                       @if(!$application->isEditable()) disabled @endif
                       onchange="toggleNoExperience()">
                <label class="form-check-label fw-bold" for="no_service_experience">
                    I have No Experience
                </label>
                <div class="form-text">
                    Check this box if you have no teaching experience over and above the minimum required for the position.
                    This step is non-mandatory to fill.
                </div>
            </div>
        </div>
    </div>

    @if(!$application->no_service_experience)
    <!-- Credit Points Summary -->
    <div class="row mb-4">
        <div class="col-md-6">
            <div class="card border-primary">
                <div class="card-body text-center">
                    <div class="h4 text-primary">{{ number_format($totalCreditPoints, 2) }}</div>
                    <div class="small text-muted">Total Credit Points</div>
                </div>
            </div>
        </div>
        <div class="col-md-6">
            <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 10)</div>
                </div>
            </div>
        </div>
    </div>

    <!-- Service Statistics -->
    <div class="row mb-4">
        <div class="col-md-4">
            <div class="card border-info">
                <div class="card-body text-center">
                    <div class="h5 text-info">{{ $totalServicePeriods }}</div>
                    <div class="small text-muted">Service Periods</div>
                </div>
            </div>
        </div>
        <div class="col-md-4">
            <div class="card border-warning">
                <div class="card-body text-center">
                    <div class="h5 text-warning">{{ $totalSemesters }}</div>
                    <div class="small text-muted">Total Semesters</div>
                </div>
            </div>
        </div>
        <div class="col-md-4">
            <div class="card border-secondary">
                <div class="card-body text-center">
                    <div class="h5 text-secondary">{{ $totalYears }}</div>
                    <div class="small text-muted">Total Years</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 Semester:</strong> 2 Points
            </div>
            <div class="col-md-6">
                <strong>Total Service Periods:</strong> {{ $totalServicePeriods }}
            </div>
        </div>
        <hr>
        <div class="alert alert-warning mb-0">
            <strong>Important:</strong> 
            <ul class="mb-0">
                <li>Maximum 10 credit points can be used for further calculation</li>
                <li>If sum of credit points is more than 10, only 10 will be considered for evaluation</li>
                <li>Only experience over and above minimum required should be included</li>
                <li>This step is non-mandatory to fill</li>
                <li>Upload certificates or proof documents for verification</li>
            </ul>
        </div>
    </div>

    <!-- Service Length Section -->
    <div class="card shadow mb-4" id="serviceLengthSection">
        <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-clock me-2"></i>Service Length Details
                </h6>
                @if($application->isEditable())
                <button type="button" class="btn btn-primary btn-sm" data-bs-toggle="modal" data-bs-target="#addServiceLengthModal">
                    <i class="fas fa-plus me-1"></i>Add Service Period
                </button>
                @endif
            </div>
        </div>
        <div class="card-body">
            @if($serviceLengths->count() > 0)
                <div class="table-responsive">
                    <table class="table table-bordered">
                        <thead class="table-light">
                            <tr>
                                <th>Sr. No</th>
                                <th>Designation</th>
                                <th>Organization</th>
                                <th>Duration (From Date/To Date)</th>
                                <th>Number of Semesters</th>
                                <th>Credit Points</th>
                                <th>Proof Document</th>
                                @if($application->isEditable())
                                <th>Actions</th>
                                @endif
                            </tr>
                        </thead>
                        <tbody>
                            @foreach($serviceLengths as $service)
                            <tr>
                                <td>{{ $service->serial_no }}</td>
                                <td class="fw-bold">{{ $service->designation }}</td>
                                <td>{{ $service->organization }}</td>
                                <td>{{ $service->duration }}</td>
                                <td>
                                    <span class="badge badge-info">
                                        {{ $service->number_of_semesters }} Semester{{ $service->number_of_semesters > 1 ? 's' : '' }}
                                    </span>
                                </td>
                                <td class="fw-bold text-primary">{{ number_format($service->credit_points, 2) }}</td>
                                <td>
                                    @if($service->hasDocument())
                                        <a href="{{ route('applicant.service-lengths.download-document', [$application, $service]) }}" 
                                           class="btn btn-sm btn-outline-primary" title="Download Certificate">
                                            <i class="fas fa-download"></i>
                                        </a>
                                    @else
                                        <span class="text-danger">No Document</span>
                                    @endif
                                </td>
                                @if($application->isEditable())
                                <td>
                                    <div class="btn-group" role="group">
                                        <button type="button" class="btn btn-sm btn-outline-primary" 
                                                onclick="editServiceLength({{ $service->id }})" title="Edit">
                                            <i class="fas fa-edit"></i>
                                        </button>
                                        <button type="button" class="btn btn-sm btn-outline-danger" 
                                                onclick="deleteServiceLength({{ $service->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">Service Summary</h6>
                                    <p class="mb-1"><strong>Total Service Periods:</strong> {{ $totalServicePeriods }}</p>
                                    <p class="mb-1"><strong>Total Semesters:</strong> {{ $totalSemesters }}</p>
                                    <p class="mb-1"><strong>Total Years:</strong> {{ $totalYears }}</p>
                                    <p class="mb-0"><strong>Total Credit Points:</strong> {{ number_format($totalCreditPoints, 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>Evaluation Points:</strong> {{ number_format($evaluationPoints, 2) }} / 10</p>
                                    @if($totalCreditPoints > 10)
                                        <p class="mb-0 text-warning"><strong>Note:</strong> Total exceeds 10, capped at 10 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-clock fa-4x text-muted mb-3"></i>
                    <h5 class="text-muted">No Service Length Added</h5>
                    <p class="text-muted">Add your teaching experience over and above the minimum required to earn credit points.</p>
                    @if($application->isEditable())
                        <button type="button" class="btn btn-primary" data-bs-toggle="modal" data-bs-target="#addServiceLengthModal">
                            <i class="fas fa-plus me-2"></i>Add First Service Period
                        </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 Service Length Modal -->
@if($application->isEditable())
<div class="modal fade" id="addServiceLengthModal" tabindex="-1" aria-labelledby="addServiceLengthModalLabel" aria-hidden="true">
    <div class="modal-dialog modal-xl">
        <div class="modal-content">
            <div class="modal-header">
                <h5 class="modal-title" id="addServiceLengthModalLabel">Add Service Length</h5>
                <button type="button" class="btn-close" data-bs-dismiss="modal" aria-label="Close"></button>
            </div>
            <form id="serviceLengthForm" method="POST" enctype="multipart/form-data">
                @csrf
                <div class="modal-body">
                    <input type="hidden" id="service_length_id" name="service_length_id">
                    
                    <div class="row">
                        <div class="col-md-6">
                            <div class="mb-3">
                                <label for="designation" class="form-label">Designation <span class="text-danger">*</span></label>
                                <select class="form-select" id="designation" name="designation" required>
                                    <option value="">Select Designation</option>
                                    <option value="Assistant Professor">Assistant Professor</option>
                                    <option value="Associate Professor">Associate Professor</option>
                                    <option value="Professor">Professor</option>
                                    <option value="Lecturer">Lecturer</option>
                                    <option value="Senior Lecturer">Senior Lecturer</option>
                                    <option value="Principal">Principal</option>
                                    <option value="Vice Principal">Vice Principal</option>
                                    <option value="Head of Department">Head of Department</option>
                                    <option value="Dean">Dean</option>
                                    <option value="Director">Director</option>
                                    <option value="Research Associate">Research Associate</option>
                                    <option value="Research Fellow">Research Fellow</option>
                                    <option value="Post Doctoral Fellow">Post Doctoral Fellow</option>
                                    <option value="Visiting Faculty">Visiting Faculty</option>
                                    <option value="Guest Faculty">Guest Faculty</option>
                                    <option value="Other">Other</option>
                                </select>
                                <small class="text-muted">Your designation during this service period</small>
                            </div>
                        </div>
                        <div class="col-md-6">
                            <div class="mb-3">
                                <label for="organization" class="form-label">Organization <span class="text-danger">*</span></label>
                                <input type="text" class="form-control" id="organization" name="organization" required>
                                <small class="text-muted">Name of the institution/organization</small>
                            </div>
                        </div>
                    </div>
                    
                    <div class="row">
                        <div class="col-md-4">
                            <div class="mb-3">
                                <label for="from_date" class="form-label">From Date <span class="text-danger">*</span></label>
                                <input type="date" class="form-control" id="from_date" name="from_date" required onchange="calculateSemesters()">
                            </div>
                        </div>
                        <div class="col-md-4">
                            <div class="mb-3">
                                <label for="to_date" class="form-label">To Date <span class="text-danger">*</span></label>
                                <input type="date" class="form-control" id="to_date" name="to_date" required onchange="calculateSemesters()">
                            </div>
                        </div>
                        <div class="col-md-4">
                            <div class="mb-3">
                                <label for="number_of_semesters" class="form-label">Number of Semesters <span class="text-danger">*</span></label>
                                <input type="number" class="form-control" id="number_of_semesters" name="number_of_semesters" 
                                       min="1" required onchange="calculateCreditPoints()">
                                <small class="text-muted" id="semesters_info">Total semesters served</small>
                            </div>
                        </div>
                    </div>
                    
                    <div class="row">
                        <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-calculator"></i>
                                    </span>
                                </div>
                                <small class="text-muted" id="credit_points_info">
                                    2 credit points per semester
                                </small>
                            </div>
                        </div>
                        <div class="col-md-6">
                            <div class="mb-3">
                                <label for="proof_document" class="form-label">Upload Proof (Certificate, etc.) <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 certificate or proof document (PDF only, max 5MB)</small>
                            </div>
                        </div>
                    </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 Service Period</button>
                </div>
            </form>
        </div>
    </div>
</div>
@endif

<script>
function toggleNoExperience() {
    const checkbox = document.getElementById('no_service_experience');
    const serviceLengthSection = document.getElementById('serviceLengthSection');
    
    if (checkbox.checked) {
        serviceLengthSection.style.display = 'none';
        // Update application
        updateNoExperienceStatus(true);
    } else {
        serviceLengthSection.style.display = 'block';
        updateNoExperienceStatus(false);
    }
}

function updateNoExperienceStatus(noExperience) {
    fetch(`{{ route("applicant.applications.update-no-service-experience", $application) }}`, {
        method: 'POST',
        headers: {
            'X-CSRF-TOKEN': '{{ csrf_token() }}',
            'Content-Type': 'application/json',
        },
        body: JSON.stringify({
            no_service_experience: noExperience
        })
    })
    .then(response => response.json())
    .then(data => {
        if (!data.success) {
            console.error('Error updating no experience status');
        }
    })
    .catch(error => {
        console.error('Error:', error);
    });
}

function calculateSemesters() {
    const fromDate = document.getElementById('from_date').value;
    const toDate = document.getElementById('to_date').value;
    
    if (fromDate && toDate) {
        const from = new Date(fromDate);
        const to = new Date(toDate);
        const months = (to.getFullYear() - from.getFullYear()) * 12 + (to.getMonth() - from.getMonth()) + 1;
        const semesters = Math.ceil(months / 6); // 6 months per semester
        
        if (semesters > 0) {
            document.getElementById('number_of_semesters').value = semesters;
            calculateCreditPoints();
        }
    }
}

function calculateCreditPoints() {
    const semesters = parseInt(document.getElementById('number_of_semesters').value) || 0;
    const creditPoints = semesters * 2; // 2 points per semester
    
    document.getElementById('credit_points_display').value = creditPoints;
    
    const infoElement = document.getElementById('credit_points_info');
    const semestersInfoElement = document.getElementById('semesters_info');
    
    if (semesters > 0) {
        infoElement.innerHTML = `${semesters} semester${semesters > 1 ? 's' : ''} × 2 = ${creditPoints} credit point${creditPoints > 1 ? 's' : ''}`;
        infoElement.className = 'text-success';
        semestersInfoElement.innerHTML = `${semesters} semester${semesters > 1 ? 's' : ''} (${Math.round(semesters / 2 * 10) / 10} year${semesters > 2 ? 's' : ''})`;
        semestersInfoElement.className = 'text-info';
    } else {
        infoElement.innerHTML = '2 credit points per semester';
        infoElement.className = 'text-muted';
        semestersInfoElement.innerHTML = 'Total semesters served';
        semestersInfoElement.className = 'text-muted';
    }
}

function editServiceLength(serviceId) {
    // Fetch service data and populate modal
    fetch(`{{ route("applicant.service-lengths.show", [$application, "SERVICE_ID"]) }}`.replace('SERVICE_ID', serviceId))
        .then(response => response.json())
        .then(data => {
            document.getElementById('service_length_id').value = data.id;
            document.getElementById('designation').value = data.designation;
            document.getElementById('organization').value = data.organization;
            document.getElementById('from_date').value = data.from_date;
            document.getElementById('to_date').value = data.to_date;
            document.getElementById('number_of_semesters').value = data.number_of_semesters;
            
            calculateCreditPoints();
            
            document.getElementById('addServiceLengthModalLabel').textContent = 'Edit Service Length';
            document.getElementById('serviceLengthForm').action = 
                `{{ route("applicant.service-lengths.update", [$application, "SERVICE_ID"]) }}`.replace('SERVICE_ID', serviceId);
            
            // Show modal
            new bootstrap.Modal(document.getElementById('addServiceLengthModal')).show();
        })
        .catch(error => {
            console.error('Error:', error);
            alert('Error loading service data');
        });
}

function deleteServiceLength(serviceId) {
    if (confirm('Are you sure you want to delete this service period?')) {
        fetch(`{{ route("applicant.service-lengths.destroy", [$application, "SERVICE_ID"]) }}`.replace('SERVICE_ID', serviceId), {
            method: 'DELETE',
            headers: {
                'X-CSRF-TOKEN': '{{ csrf_token() }}',
                'Content-Type': 'application/json',
            },
        })
        .then(response => response.json())
        .then(data => {
            if (data.success) {
                location.reload();
            } else {
                alert('Error deleting service period');
            }
        })
        .catch(error => {
            console.error('Error:', error);
            alert('Error deleting service period');
        });
    }
}

// Reset modal when opening for new service
document.getElementById('addServiceLengthModal').addEventListener('show.bs.modal', function (event) {
    if (!event.relatedTarget || !event.relatedTarget.onclick) {
        // Reset form for new service
        document.getElementById('serviceLengthForm').reset();
        document.getElementById('service_length_id').value = '';
        document.getElementById('addServiceLengthModalLabel').textContent = 'Add Service Length';
        document.getElementById('serviceLengthForm').action = '{{ route("applicant.service-lengths.store", $application) }}';
        document.getElementById('credit_points_display').value = '';
        document.getElementById('credit_points_info').innerHTML = '2 credit points per semester';
        document.getElementById('credit_points_info').className = 'text-muted';
        document.getElementById('semesters_info').innerHTML = 'Total semesters served';
        document.getElementById('semesters_info').className = 'text-muted';
    }
});

// Handle form submission
document.getElementById('serviceLengthForm').addEventListener('submit', function(e) {
    e.preventDefault();
    
    const formData = new FormData(this);
    const isEdit = document.getElementById('service_length_id').value !== '';
    
    if (isEdit) {
        formData.append('_method', 'PUT');
    }
    
    fetch(this.action, {
        method: 'POST',
        body: formData,
        headers: {
            'X-CSRF-TOKEN': '{{ csrf_token() }}',
        },
    })
    .then(response => response.json())
    .then(data => {
        if (data.success) {
            location.reload();
        } else {
            alert('Error saving service period: ' + (data.message || 'Unknown error'));
        }
    })
    .catch(error => {
        console.error('Error:', error);
        alert('Error saving service period');
    });
});

// Initialize page state
document.addEventListener('DOMContentLoaded', function() {
    toggleNoExperience();
});
</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-info {
    background-color: #17a2b8;
    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