@extends('layouts.app')

@section('title', 'Upload Material')
@section('page-title', 'Upload New Material')

@section('header-buttons')
    <a href="{{ route('materials.index') }}" class="btn btn-outline-secondary">
        <i class="fas fa-arrow-left me-1"></i> Back
    </a>
@endsection

@section('content')
<div class="row">
    <div class="col-lg-8">
        <div class="card shadow-sm border-0">
            <div class="card-header bg-transparent py-3">
                <h5 class="card-title mb-0 text-dark">
                    <i class="fas fa-cloud-upload-alt text-primary me-2"></i>Upload Study Material
                </h5>
            </div>
            <div class="card-body">
                <form action="{{ route('materials.store') }}" method="POST" enctype="multipart/form-data" id="uploadForm" class="needs-validation" novalidate>
                    @csrf
                    
                    <!-- Class Selection - Auto-selected if only one class -->
                    <div class="mb-4">
                        <label for="class_id" class="form-label fw-semibold text-dark">Class Assignment <span class="text-danger">*</span></label>
                        
                        @if($classes->count() === 1)
                            <!-- Auto-select single class -->
                            @php $singleClass = $classes->first(); @endphp
                            <div class="alert alert-info">
                                <div class="d-flex align-items-center">
                                    <i class="fas fa-info-circle me-3 fs-5"></i>
                                    <div class="flex-grow-1">
                                        <strong>Auto-selected Class:</strong>
                                        <div class="mt-1">
                                            {{ $singleClass->batch->name }} - {{ $singleClass->subject->title }}
                                            <span class="text-muted">({{ $singleClass->teacher->user->username }})</span>
                                        </div>
                                    </div>
                                </div>
                            </div>
                            <input type="hidden" name="class_id" value="{{ $singleClass->id }}">
                            <div class="p-3 border rounded bg-light">
                                <div class="d-flex justify-content-between align-items-center">
                                    <div>
                                        <strong>{{ $singleClass->batch->name }}</strong> - {{ $singleClass->subject->title }}
                                        <div class="text-muted small">Teacher: {{ $singleClass->teacher->user->username }}</div>
                                    </div>
                                    <span class="badge bg-success">
                                        <i class="fas fa-check me-1"></i>Selected
                                    </span>
                                </div>
                            </div>
                        @elseif($classes->count() > 1)
                            <!-- Multiple classes - show dropdown -->
                            <select name="class_id" id="class_id" class="form-select form-select-lg @error('class_id') is-invalid @enderror" required>
                                <option value="">Choose a Class...</option>
                                @foreach($classes as $class)
                                    <option value="{{ $class->id }}" {{ old('class_id') == $class->id ? 'selected' : '' }}>
                                        {{ $class->batch->name }} - {{ $class->subject->title }} 
                                        ({{ $class->teacher->user->username }})
                                    </option>
                                @endforeach
                            </select>
                            <div class="form-text text-muted">
                                <i class="fas fa-info-circle me-1"></i>Select the class for which you're uploading this material
                            </div>
                        @else
                            <!-- No classes assigned -->
                            <div class="alert alert-warning">
                                <div class="d-flex align-items-center">
                                    <i class="fas fa-exclamation-triangle me-3 fs-5"></i>
                                    <div>
                                        <strong>No Classes Assigned</strong>
                                        <div class="mt-1">You don't have any active classes assigned. Please contact administrator to get assigned to classes.</div>
                                    </div>
                                </div>
                            </div>
                        @endif
                        
                        @error('class_id')
                            <div class="invalid-feedback d-flex align-items-center">
                                <i class="fas fa-exclamation-circle me-2"></i>{{ $message }}
                            </div>
                        @enderror
                    </div>

                    <!-- Material Title -->
                    <div class="mb-4">
                        <label for="title" class="form-label fw-semibold text-dark">Material Title <span class="text-danger">*</span></label>
                        <div class="input-group input-group-lg">
                            <span class="input-group-text bg-light border-end-0">
                                <i class="fas fa-heading text-muted"></i>
                            </span>
                            <input type="text" name="title" id="title" class="form-control border-start-0 @error('title') is-invalid @enderror" 
                                   value="{{ old('title') }}" placeholder="Enter a descriptive title for this study material" required
                                   maxlength="180">
                        </div>
                        <div class="d-flex justify-content-between align-items-center mt-1">
                            <div class="form-text text-muted">
                                <i class="fas fa-info-circle me-1"></i>Clear, descriptive titles help students find materials easily
                            </div>
                            <small class="text-muted">
                                <span id="titleLength">0</span>/180 characters
                            </small>
                        </div>
                        @error('title')
                            <div class="invalid-feedback d-flex align-items-center">
                                <i class="fas fa-exclamation-circle me-2"></i>{{ $message }}
                            </div>
                        @enderror
                    </div>

                    <!-- File Upload -->
                    <div class="mb-4">
                        <label for="file" class="form-label fw-semibold text-dark">Study Material File <span class="text-danger">*</span></label>
                        <div class="file-upload-area">
                            <input type="file" name="file" id="file" class="form-control form-control-lg @error('file') is-invalid @enderror" 
                                   accept=".pdf,.doc,.docx,.ppt,.pptx,.xls,.xlsx,.jpg,.jpeg,.png,.mp4,.avi,.txt,.zip,.rar" required>
                            
                            <!-- File Preview Area -->
                            <div id="filePreview" class="mt-3 d-none">
                                <div class="card border-dashed">
                                    <div class="card-body text-center">
                                        <div id="filePreviewContent"></div>
                                    </div>
                                </div>
                            </div>
                            
                            <div class="form-text text-muted mt-2">
                                <i class="fas fa-info-circle me-1"></i>
                                Maximum file size: 50MB. Supported formats: Documents, Presentations, Spreadsheets, Images, Videos, Archives
                            </div>
                        </div>
                        @error('file')
                            <div class="invalid-feedback d-flex align-items-center">
                                <i class="fas fa-exclamation-circle me-2"></i>{{ $message }}
                            </div>
                        @enderror
                    </div>

                    <!-- Publication Settings -->
                    <div class="mb-4">
                        <div class="card border-0 bg-light">
                            <div class="card-body">
                                <div class="form-check form-switch form-switch-lg mb-2">
                                    <input class="form-check-input" type="checkbox" name="published" id="published" value="1" 
                                           {{ old('published', true) ? 'checked' : '' }}>
                                    <label class="form-check-label fw-semibold text-dark" for="published">
                                        <i class="fas fa-globe me-2"></i>Publish Material Immediately
                                    </label>
                                </div>
                                <div class="form-text text-muted ms-4">
                                    Published materials are immediately visible to students. Uncheck to save as draft.
                                </div>
                                @error('published')
                                    <div class="invalid-feedback d-flex align-items-center mt-2">
                                        <i class="fas fa-exclamation-circle me-2"></i>{{ $message }}
                                    </div>
                                @enderror
                            </div>
                        </div>
                    </div>

                    <!-- Form Actions -->
                    <div class="d-flex justify-content-between align-items-center pt-3 border-top">
                        <a href="{{ route('materials.index') }}" class="btn btn-outline-secondary btn-lg">
                            <i class="fas fa-times me-2"></i>Cancel
                        </a>
                        <button type="submit" class="btn btn-primary btn-lg px-4" id="submitBtn" 
                                {{ $classes->isEmpty() ? 'disabled' : '' }}>
                            <i class="fas fa-cloud-upload-alt me-2"></i>Upload Material
                        </button>
                    </div>
                </form>
            </div>
        </div>
    </div>

    <!-- Sidebar Guidelines -->
    <div class="col-lg-4">
        <!-- Upload Guidelines -->
        <div class="card shadow-sm border-0 mb-4">
            <div class="card-header bg-transparent py-3">
                <h6 class="card-title mb-0 text-dark">
                    <i class="fas fa-lightbulb text-warning me-2"></i>Upload Guidelines
                </h6>
            </div>
            <div class="card-body">
                <div class="guideline-list">
                    <div class="guideline-item d-flex align-items-start mb-3">
                        <div class="guideline-icon bg-primary bg-opacity-10 rounded-circle p-2 me-3">
                            <i class="fas fa-check text-primary"></i>
                        </div>
                        <div>
                            <strong>File Size Limit</strong>
                            <div class="text-muted small">Maximum 50MB per file</div>
                        </div>
                    </div>
                    
                    <div class="guideline-item d-flex align-items-start mb-3">
                        <div class="guideline-icon bg-success bg-opacity-10 rounded-circle p-2 me-3">
                            <i class="fas fa-check text-success"></i>
                        </div>
                        <div>
                            <strong>Supported Formats</strong>
                            <div class="text-muted small">PDF, Word, Excel, PowerPoint, Images, Videos</div>
                        </div>
                    </div>
                    
                    <div class="guideline-item d-flex align-items-start mb-3">
                        <div class="guideline-icon bg-info bg-opacity-10 rounded-circle p-2 me-3">
                            <i class="fas fa-check text-info"></i>
                        </div>
                        <div>
                            <strong>Naming Convention</strong>
                            <div class="text-muted small">Use clear, descriptive titles</div>
                        </div>
                    </div>
                    
                    <div class="guideline-item d-flex align-items-start">
                        <div class="guideline-icon bg-warning bg-opacity-10 rounded-circle p-2 me-3">
                            <i class="fas fa-exclamation text-warning"></i>
                        </div>
                        <div>
                            <strong>Copyright Notice</strong>
                            <div class="text-muted small">Only upload materials you have rights to distribute</div>
                        </div>
                    </div>
                </div>
            </div>
        </div>

        <!-- File Type Icons -->
        <div class="card shadow-sm border-0">
            <div class="card-header bg-transparent py-3">
                <h6 class="card-title mb-0 text-dark">
                    <i class="fas fa-file-alt text-info me-2"></i>Supported File Types
                </h6>
            </div>
            <div class="card-body">
                <div class="row g-3 text-center">
                    <div class="col-4">
                        <div class="file-type-icon">
                            <i class="fas fa-file-pdf text-danger fa-2x mb-2"></i>
                            <div class="small fw-semibold">PDF</div>
                        </div>
                    </div>
                    <div class="col-4">
                        <div class="file-type-icon">
                            <i class="fas fa-file-word text-primary fa-2x mb-2"></i>
                            <div class="small fw-semibold">Word</div>
                        </div>
                    </div>
                    <div class="col-4">
                        <div class="file-type-icon">
                            <i class="fas fa-file-powerpoint text-warning fa-2x mb-2"></i>
                            <div class="small fw-semibold">PPT</div>
                        </div>
                    </div>
                    <div class="col-4">
                        <div class="file-type-icon">
                            <i class="fas fa-file-excel text-success fa-2x mb-2"></i>
                            <div class="small fw-semibold">Excel</div>
                        </div>
                    </div>
                    <div class="col-4">
                        <div class="file-type-icon">
                            <i class="fas fa-file-image text-info fa-2x mb-2"></i>
                            <div class="small fw-semibold">Images</div>
                        </div>
                    </div>
                    <div class="col-4">
                        <div class="file-type-icon">
                            <i class="fas fa-file-video text-purple fa-2x mb-2"></i>
                            <div class="small fw-semibold">Videos</div>
                        </div>
                    </div>
                </div>
            </div>
        </div>
    </div>
</div>
@endsection

@section('styles')
<style>
    .border-dashed {
        border: 2px dashed #dee2e6 !important;
    }
    
    .file-upload-area {
        transition: all 0.3s ease;
    }
    
    .file-type-icon {
        transition: transform 0.3s ease;
        padding: 10px;
        border-radius: 8px;
    }
    
    .file-type-icon:hover {
        transform: translateY(-2px);
        background: rgba(0, 0, 0, 0.02);
    }
    
    .guideline-item {
        transition: transform 0.2s ease;
    }
    
    .guideline-item:hover {
        transform: translateX(5px);
    }
    
    .form-switch-lg .form-check-input {
        height: 1.5rem;
        width: 3rem;
    }
    
    .text-purple {
        color: #6f42c1 !important;
    }
    
    .card {
        transition: box-shadow 0.3s ease;
    }
    
    .card:hover {
        box-shadow: 0 0.5rem 1rem rgba(0, 0, 0, 0.15) !important;
    }
    
    #filePreview .card {
        background: linear-gradient(135deg, #f8f9fa 0%, #e9ecef 100%);
    }
</style>
@endsection

@section('scripts')
<script>
$(document).ready(function() {
    // Character counter for title
    $('#title').on('input', function() {
        const length = $(this).val().length;
        $('#titleLength').text(length);
        
        if (length > 180) {
            $(this).addClass('is-invalid');
        } else {
            $(this).removeClass('is-invalid');
        }
    });

    // File validation and preview
    $('#file').change(function() {
        const file = this.files[0];
        const preview = $('#filePreview');
        const previewContent = $('#filePreviewContent');
        
        if (file) {
            const fileSizeMB = (file.size / 1024 / 1024).toFixed(2);
            const fileName = file.name;
            const fileExtension = fileName.split('.').pop().toLowerCase();
            
            // File size validation
            if (fileSizeMB > 50) {
                showAlert('File Size Exceeded', `File size (${fileSizeMB}MB) exceeds the 50MB limit. Please choose a smaller file.`, 'error');
                this.value = '';
                preview.addClass('d-none');
                return;
            }
            
            // Show file preview
            preview.removeClass('d-none');
            let iconClass = 'fas fa-file text-primary';
            let fileType = 'Document';
            
            // Determine file type and icon
            if (fileExtension === 'pdf') {
                iconClass = 'fas fa-file-pdf text-danger';
                fileType = 'PDF Document';
            } else if (['doc', 'docx'].includes(fileExtension)) {
                iconClass = 'fas fa-file-word text-primary';
                fileType = 'Word Document';
            } else if (['ppt', 'pptx'].includes(fileExtension)) {
                iconClass = 'fas fa-file-powerpoint text-warning';
                fileType = 'PowerPoint';
            } else if (['xls', 'xlsx'].includes(fileExtension)) {
                iconClass = 'fas fa-file-excel text-success';
                fileType = 'Excel Spreadsheet';
            } else if (['jpg', 'jpeg', 'png', 'gif', 'bmp'].includes(fileExtension)) {
                iconClass = 'fas fa-file-image text-success';
                fileType = 'Image File';
            } else if (['mp4', 'avi', 'mov', 'wmv'].includes(fileExtension)) {
                iconClass = 'fas fa-file-video text-warning';
                fileType = 'Video File';
            } else if (['zip', 'rar'].includes(fileExtension)) {
                iconClass = 'fas fa-file-archive text-secondary';
                fileType = 'Archive File';
            }
            
            previewContent.html(`
                <div class="d-flex align-items-center justify-content-center mb-3">
                    <i class="${iconClass} fa-4x"></i>
                </div>
                <h6 class="text-dark mb-1">${fileName}</h6>
                <div class="text-muted small mb-2">${fileType}</div>
                <div class="badge bg-light text-dark">
                    <i class="fas fa-weight me-1"></i>${fileSizeMB} MB
                </div>
            `);
            
            showAlert('File Selected', `Ready to upload: ${fileName} (${fileType}, ${fileSizeMB}MB)`, 'success', 3000);
        } else {
            preview.addClass('d-none');
        }
    });

    // Form submission handling
    $('#uploadForm').on('submit', function(e) {
        if (this.checkValidity() === false) {
            e.preventDefault();
            e.stopPropagation();
        } else {
            $('#submitBtn').prop('disabled', true).html('<i class="fas fa-spinner fa-spin me-2"></i>Uploading...');
        }
        this.classList.add('was-validated');
    });

    // Helper function for alerts
    function showAlert(title, message, type, duration = 5000) {
        const alertClass = type === 'error' ? 'danger' : type;
        const alertHtml = `
            <div class="alert alert-${alertClass} alert-dismissible fade show" role="alert">
                <strong>${title}</strong> ${message}
                <button type="button" class="btn-close" data-bs-dismiss="alert"></button>
            </div>
        `;
        
        // Remove existing alerts
        $('.alert').alert('close');
        
        // Add new alert
        $('#uploadForm').prepend(alertHtml);
        
        // Auto remove after duration
        setTimeout(() => {
            $('.alert').alert('close');
        }, duration);
    }

    // Initialize title length counter
    $('#title').trigger('input');
});
</script>
@endsection