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# blog/admin.py — basic and customised admin registration
from django.contrib import admin
from django.utils.html import format_html
from .models import Post, Category, Tag

@admin.register(Category)
class CategoryAdmin(admin.ModelAdmin):
    list_display       = ['name', 'slug']
    prepopulated_fields = {'slug': ('name',)}
    search_fields      = ['name']

@admin.register(Tag)
class TagAdmin(admin.ModelAdmin):
    list_display        = ['name', 'slug']
    prepopulated_fields = {'slug': ('name',)}

@admin.register(Post)
class PostAdmin(admin.ModelAdmin):
    list_display        = ['title', 'author', 'category', 'status', 'published_at', 'cover_preview']
    list_filter         = ['status', 'created_at', 'category']
    search_fields       = ['title', 'body', 'author__username']
    prepopulated_fields = {'slug': ('title',)}
    raw_id_fields       = ['author']
    date_hierarchy      = 'published_at'
    ordering            = ['-published_at']
    filter_horizontal   = ['tags']

@admin.display(description='Cover')
    def cover_preview(self, obj):
        if obj.cover_img:
            return format_html('<img src="{}" height="40">', obj.cover_img.url)
        return '-'