"""
Custom widgets for Django admin interface
"""

from django import forms
from django.utils.html import format_html
from django.utils.safestring import mark_safe
from django.urls import reverse
from django.conf import settings

from ..models import ImageLibrary


class ImageLibraryWidget(forms.Select):
    """Custom widget for selecting images from the library with visual preview"""

    def __init__(self, attrs=None):
        super().__init__(attrs)
        self.attrs.update(
            {
                "class": "image-library-select",
                "style": "display: none;",  # Hide the original select
            }
        )

    def render(self, name, value, attrs=None, renderer=None):
        """Render the widget with image previews"""
        # Get the original select element
        original_select = super().render(name, value, attrs, renderer)

        # Get all images from the library
        images = ImageLibrary.objects.all().order_by("-uploaded_at")

        # Create the visual interface
        html_parts = [
            '<div class="image-library-widget">',
            original_select,  # Keep the original select for form submission
            '<div class="image-library-grid">',
        ]

        # Add "No image" option
        no_image_selected = "selected" if not value else ""
        html_parts.append(
            f"""
            <div class="image-option {no_image_selected}" data-value="">
                <div class="image-preview no-image">
                    <i class="fas fa-ban"></i>
                    <span>No image</span>
                </div>
                <div class="image-info">
                    <span class="image-name">No image selected</span>
                </div>
            </div>
        """
        )

        # Add each image as an option
        for image in images:
            selected = "selected" if str(image.pk) == str(value) else ""
            image_url = image.image.url if image.image else ""

            # Use img tag for all images in widget to maintain clickability
            # SVG files will still display correctly with img tag
            preview_html = (
                f'<img src="{image_url}" alt="{image.alt_text}" loading="lazy">'
            )

            html_parts.append(
                f"""
                <div class="image-option {selected}" data-value="{image.pk}">
                    <div class="image-preview">
                        {preview_html}
                    </div>
                    <div class="image-info">
                        <span class="image-name">{image.name}</span>
                        <span class="image-category">{image.get_category_display()}</span>
                        <span class="image-size">{image.width}x{image.height}</span>
                    </div>
                </div>
            """
            )

        html_parts.extend(
            [
                "</div>",
                "</div>",
                self._get_styles(),
                self._get_javascript(),
            ]
        )

        return mark_safe("".join(html_parts))

    def _get_styles(self):
        """Return CSS styles for the widget"""
        return """
        <style>
        .image-library-widget {
            margin: 10px 0;
        }
        
        .image-library-grid {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
            gap: 15px;
            max-height: 800px;
            overflow-y: auto;
            border: 1px solid #ddd;
            padding: 15px;
            background: #f9f9f9;
            border-radius: 5px;
        }
        
        .image-option {
            background: white;
            border: 2px solid #ddd;
            border-radius: 5px;
            padding: 10px;
            cursor: pointer;
            transition: all 0.3s ease;
            text-align: center;
        }
        
        .image-option:hover {
            border-color: #007cba;
            transform: translateY(-2px);
            box-shadow: 0 4px 8px rgba(0,0,0,0.1);
        }
        
        .image-option.selected {
            border-color: #007cba;
            background: #e3f2fd;
            box-shadow: 0 0 0 2px rgba(0, 124, 186, 0.2);
        }
        
        .image-preview {
            width: 100%;
            height: 120px;
            display: flex;
            align-items: center;
            justify-content: center;
            margin-bottom: 8px;
            border-radius: 3px;
            overflow: hidden;
            background: #f5f5f5;
        }
        
        .image-preview img {
            max-width: 100%;
            max-height: 100%;
            object-fit: cover;
            border-radius: 3px;
        }
        
        .image-preview.no-image {
            background: #f0f0f0;
            color: #666;
            flex-direction: column;
        }
        
        .image-preview.no-image i {
            font-size: 24px;
            margin-bottom: 5px;
        }
        
        .image-info {
            text-align: left;
        }
        
        .image-name {
            display: block;
            font-weight: 600;
            font-size: 12px;
            color: #333;
            margin-bottom: 3px;
            overflow: hidden;
            text-overflow: ellipsis;
            white-space: nowrap;
        }
        
        .image-category {
            display: inline-block;
            background: #e0e0e0;
            color: #666;
            padding: 2px 6px;
            border-radius: 3px;
            font-size: 10px;
            margin-right: 5px;
        }
        
        .image-size {
            font-size: 10px;
            color: #666;
        }
        </style>
        """

    def _get_javascript(self):
        """Return JavaScript for the widget functionality"""
        return """
        <script>
        document.addEventListener('DOMContentLoaded', function() {
            // Handle image selection
            document.querySelectorAll('.image-option').forEach(function(option) {
                option.addEventListener('click', function() {
                    const widget = this.closest('.image-library-widget');
                    const select = widget.querySelector('.image-library-select');
                    const value = this.dataset.value;
                    
                    // Update the hidden select
                    select.value = value;
                    
                    // Update visual selection
                    widget.querySelectorAll('.image-option').forEach(function(opt) {
                        opt.classList.remove('selected');
                    });
                    this.classList.add('selected');
                    
                    // Trigger change event
                    select.dispatchEvent(new Event('change'));
                });
            });
        });
        </script>
        """

    class Media:
        css = {
            "all": (
                "https://cdnjs.cloudflare.com/ajax/libs/font-awesome/6.0.0/css/all.min.css",
            )
        }