@extends('layouts.app')

@section('content')
    <div id="page-container" class="fade page-sidebar-fixed page-header-fixed page-with-wide-sidebar">
        <!-- begin #header -->
        @include('partials.header')
        <!-- end #header -->

        <!-- begin #sidebar -->
        @include('partials.sidebar')
        <!-- end #sidebar -->

        <!-- begin #content -->
        <div id="content" class="content">
            <!-- begin breadcrumb -->
            <ol class="breadcrumb float-xl-right">
                <li class="breadcrumb-item"><a href="javascript:;">Home</a></li>
                <li class="breadcrumb-item"><a href="javascript:;">Page Options</a></li>
                <li class="breadcrumb-item active">Background Image</li>
            </ol>
            <!-- end breadcrumb -->
            <!-- begin page-header -->
            <h1 class="page-header">Edit Background Image</h1>
            <!-- end page-header -->
            <!-- begin panel -->
            <div class="panel panel-inverse">
                <div class="panel-heading">
                    <h4 class="panel-title">Edit Background Image</h4>
                </div>
                <div class="panel-body">
                    @if ($errors->any())
                        <div class="alert alert-danger alert-dismissible fade show" role="alert">
                            <strong>Error!</strong>
                            <ul class="mb-0">
                                @foreach ($errors->all() as $error)
                                    <li>{{ $error }}</li>
                                @endforeach
                            </ul>
                            <button type="button" class="close" data-dismiss="alert" aria-label="Close">
                                <span aria-hidden="true">&times;</span>
                            </button>
                        </div>
                    @endif

                    <form action="{{ route('background_imgs.update', $backgroundImg->id) }}" method="POST"
                        enctype="multipart/form-data">
                        @csrf
                        @method('PUT')

                        <div class="form-group">
                            <label for="name">Name <span class="text-danger">*</span></label>
                            <input type="text" name="name" id="name" class="form-control"
                                value="{{ old('name', $backgroundImg->name) }}" required>
                        </div>

                        <div class="form-group">
                            <label for="is_slide">Slide</label>
                            <input type="hidden" name="is_slide" value="0">
                            <div class="switcher">
                                <input type="checkbox" name="is_slide" id="is_slide" value="1"
                                    {{ old('is_slide', $backgroundImg->is_slide) ? 'checked' : '' }}
                                    onchange="toggleImageUpload(this.checked)">
                                <label for="is_slide"></label>
                            </div>
                            <small class="form-text text-muted">
                                If slide is <strong>OFF</strong>: Upload exactly 1 image<br>
                                If slide is <strong>ON</strong>: Upload 2-3 images (maximum 3 images) and upload 2 at once
                            </small>
                        </div>

                        <div class="form-group">
                            <label>Current Images</label>
                            <div id="currentImages" class="row">
                                @php
                                    $existingImages = $backgroundImg->path ? explode(',', $backgroundImg->path) : [];
                                @endphp

                                @foreach ($existingImages as $index => $image)
                                    <div class="col-md-3 mb-3 image-item" data-image="{{ $image }}"
                                        data-index="{{ $index }}">
                                        <div class="card">
                                            <img src="{{ asset('storage/background_imgs/' . $image) }}" class="card-img-top"
                                                alt="Background Image" style="height: 150px; object-fit: cover;">
                                            <div class="card-body p-2">
                                                <small class="d-block text-center mb-2">Image {{ $index + 1 }}</small>
                                                <button type="button" class="btn btn-danger btn-sm btn-block delete-image"
                                                    data-image="{{ $image }}">
                                                    <i class="fa fa-trash"></i> Delete
                                                </button>
                                            </div>
                                        </div>
                                    </div>
                                @endforeach
                            </div>
                            <input type="hidden" name="deleted_images" id="deleted_images" value="">
                            <small class="form-text text-muted" id="slideOffMessage" style="display: none;">
                                <strong>Slide is OFF:</strong> Only 1 image will be displayed.
                            </small>
                        </div>

                        <div class="form-group">
                            <label for="path">Add New Images</label>
                            <input type="file" name="path[]" id="path" class="form-control"
                                accept="image/jpeg,image/png,image/jpg,image/gif" multiple>
                            <small class="form-text text-muted">
                                <strong>Maximum 3 images allowed in total (including existing images).</strong><br>
                                Accepted formats: JPEG, PNG, JPG, GIF<br>
                                Maximum size: 5MB per image<br>
                                Maximum dimensions: 1920x1080 pixels
                            </small>
                            <div id="newImagePreview" class="mt-3"></div>
                        </div>

                        <div class="form-group">
                            <div class="switcher">
                                <input type="checkbox" name="is_active" id="is_active" value="1"
                                    {{ old('is_active', $backgroundImg->is_active) ? 'checked' : '' }}>
                                <label for="is_active">Active</label>
                            </div>
                        </div>

                        <button type="submit" class="btn btn-custom">
                            <i class="fa fa-save"></i> Update
                        </button>
                        <a href="{{ route('background_imgs.index') }}" class="btn btn-custom">
                            <i class="fa fa-arrow-left"></i> Back
                        </a>
                    </form>
                </div>
            </div>
            <!-- end panel -->
        </div>
        <!-- end #content -->

        <!-- begin scroll to top btn -->
        <a href="javascript:;" class="btn btn-icon btn-circle btn-success btn-scroll-to-top fade" data-click="scroll-top"><i
                class="fa fa-angle-up"></i></a>
        <!-- end scroll to top btn -->

        <script>
            let deletedImages = [];

            function toggleImageUpload(isChecked) {
                const imageInput = document.getElementById('path');
                const newImagePreview = document.getElementById('newImagePreview');

                // Clear preview when toggling
                newImagePreview.innerHTML = '';
                imageInput.value = '';

                // Update image visibility based on slide state
                updateImageVisibility(isChecked);
            }

            function updateImageVisibility(isSlideOn) {
                const imageItems = document.querySelectorAll('#currentImages .image-item');
                const slideOffMessage = document.getElementById('slideOffMessage');

                if (!isSlideOn) {
                    // Slide is OFF - show only first image, hide others
                    imageItems.forEach((item, index) => {
                        if (index === 0) {
                            item.style.display = 'block';
                            // Hide delete button for the only visible image
                            item.querySelector('.delete-image').style.display = 'none';
                        } else {
                            item.style.display = 'none';
                        }
                    });
                    slideOffMessage.style.display = 'block';
                } else {
                    // Slide is ON - show all images
                    imageItems.forEach((item) => {
                        item.style.display = 'block';
                        // Show delete buttons
                        item.querySelector('.delete-image').style.display = 'block';
                    });
                    slideOffMessage.style.display = 'none';
                }
            }

            // Handle delete image button
            document.querySelectorAll('.delete-image').forEach(button => {
                button.addEventListener('click', function() {
                    const isSlide = document.getElementById('is_slide').checked;

                    // Prevent deletion if slide is OFF
                    if (!isSlide) {
                        alert('Cannot delete image when slide is OFF. Please enable slide mode first.');
                        return;
                    }

                    const imageToDelete = this.getAttribute('data-image');
                    const imageItem = this.closest('.image-item');
                    const currentVisibleCount = Array.from(document.querySelectorAll(
                            '#currentImages .image-item'))
                        .filter(item => item.style.display !== 'none').length;

                    if (confirm('Are you sure you want to delete this image?')) {
                        deletedImages.push(imageToDelete);
                        document.getElementById('deleted_images').value = deletedImages.join(',');
                        imageItem.remove();

                        // Update image numbering
                        updateImageNumbers();
                    }
                });
            });

            function updateImageNumbers() {
                const visibleItems = Array.from(document.querySelectorAll('#currentImages .image-item'))
                    .filter(item => item.style.display !== 'none');
                visibleItems.forEach((item, index) => {
                    item.querySelector('small').textContent = `Image ${index + 1}`;
                });
            }

            function getCurrentImageCount() {
                return Array.from(document.querySelectorAll('#currentImages .image-item'))
                    .filter(item => item.style.display !== 'none').length;
            }

            // Preview new images with max 3 limit
            document.getElementById('path').addEventListener('change', function(e) {
                const newImagePreview = document.getElementById('newImagePreview');
                newImagePreview.innerHTML = '';

                const files = Array.from(this.files);
                const isSlide = document.getElementById('is_slide').checked;
                const currentImageCount = getCurrentImageCount();
                const totalImageCount = currentImageCount + files.length;

                // When slide is OFF, new upload should replace existing (total = 1)
                if (!isSlide) {
                    if (files.length > 1) {
                        alert('You can only upload 1 image when slide is OFF.');
                        this.value = '';
                        return;
                    }

                    // If uploading 1 image when slide is OFF, mark all current images for deletion
                    if (files.length === 1 && currentImageCount > 0) {
                        const currentImages = document.querySelectorAll('#currentImages .image-item');
                        currentImages.forEach(item => {
                            const imageToDelete = item.getAttribute('data-image');
                            if (!deletedImages.includes(imageToDelete)) {
                                deletedImages.push(imageToDelete);
                            }
                        });
                        document.getElementById('deleted_images').value = deletedImages.join(',');
                    }
                } else {
                    // Slide is ON - enforce max 3 images
                    if (totalImageCount > 3) {
                        alert(
                            `You can upload maximum 3 images in total. You currently have ${currentImageCount} image(s). You can only add ${3 - currentImageCount} more.`
                        );
                        this.value = '';
                        return;
                    }

                    if (totalImageCount < 2) {
                        alert(`You must have at least 2 images when slide is ON. Current total: ${totalImageCount}`);
                        this.value = '';
                        return;
                    }
                }

                // Show preview
                files.forEach((file, index) => {
                    if (file.type.startsWith('image/')) {
                        const reader = new FileReader();
                        reader.onload = function(event) {
                            const imgDiv = document.createElement('div');
                            imgDiv.className = 'd-inline-block mr-2 mb-2';
                            imgDiv.style.width = '150px';
                            imgDiv.innerHTML = `
                                <img src="${event.target.result}" class="img-thumbnail" style="width: 100%; height: 150px; object-fit: cover;">
                                <small class="d-block text-center">New Image ${index + 1}</small>
                            `;
                            newImagePreview.appendChild(imgDiv);
                        };
                        reader.readAsDataURL(file);
                    }
                });
            });

            // Initialize image visibility on page load
            document.addEventListener('DOMContentLoaded', function() {
                const isSlide = document.getElementById('is_slide').checked;
                updateImageVisibility(isSlide);
            });
        </script>
    </div>
@endsection