from django.contrib import admin
from django.utils.html import format_html
from django.urls import reverse
from django.utils.safestring import mark_safe
from ..models.images import ImageLibrary


@admin.register(ImageLibrary)
class ImageLibraryAdmin(admin.ModelAdmin):
    """
    Admin interface for the Image Library.
    """

    list_display = [
        "image_thumbnail",
        "name",
        "category",
        "get_dimensions",
        "get_file_size_display",
        "usage_count",
        "uploaded_by",
        "uploaded_at",
    ]

    list_filter = [
        "category",
        "uploaded_at",
        "uploaded_by",
    ]

    search_fields = [
        "name",
        "description",
        "alt_text",
        "tags",
    ]

    readonly_fields = [
        "width",
        "height",
        "file_size",
        "usage_count",
        "uploaded_at",
        "updated_at",
        "image_preview",
    ]

    prepopulated_fields = {"slug": ("name",)}

    fieldsets = (
        ("Image Information", {"fields": ("name", "slug", "description", "alt_text")}),
        ("Image File", {"fields": ("image", "image_preview")}),
        ("Categorization", {"fields": ("category", "tags")}),
        (
            "Metadata",
            {
                "fields": ("width", "height", "file_size", "usage_count"),
                "classes": ("collapse",),
            },
        ),
        (
            "Timestamps",
            {
                "fields": ("uploaded_by", "uploaded_at", "updated_at"),
                "classes": ("collapse",),
            },
        ),
    )

    def image_thumbnail(self, obj):
        """
        Display small thumbnail in list view.
        """
        if obj.image:
            return format_html(
                '<img src="{}" width="50" height="50" style="object-fit: cover; border-radius: 4px;" />',
                obj.image.url,
            )
        return "No Image"

    image_thumbnail.short_description = "Thumbnail"

    def image_preview(self, obj):
        """
        Display larger preview in detail view.
        """
        if obj.image:
            return format_html(
                '<img src="{}" style="max-width: 300px; max-height: 300px; border-radius: 4px;" />',
                obj.image.url,
            )
        return "No Image"

    image_preview.short_description = "Preview"

    def get_dimensions(self, obj):
        """
        Display image dimensions.
        """
        if obj.width and obj.height:
            return f"{obj.width} × {obj.height}"
        return "Unknown"

    get_dimensions.short_description = "Dimensions"

    def save_model(self, request, obj, form, change):
        """
        Set uploaded_by field to current user if not already set.
        """
        if not change:  # Only set on creation
            obj.uploaded_by = request.user
        super().save_model(request, obj, form, change)

    class Media:
        css = {"all": ("admin/css/image_library.css",)}