from django.contrib import admin

from apps.course.models import Lesson, LessonCompletion




@admin.register(Lesson)
class LessonAdmin(admin.ModelAdmin):
    list_display = ('title', 'course', 'priority', 'duration', 'content_type')
    list_filter = ('course', 'content_type')
    search_fields = ('title', 'course__title')
    ordering = ('priority', 'title')

    def get_queryset(self, request):
        qs = super().get_queryset(request)
        return qs.order_by('priority')
    
    
@admin.register(LessonCompletion)
class LessonCompletionAdmin(admin.ModelAdmin):
    list_display = ('student', 'lesson', 'completed_at')
    search_fields = ('student__fullname', 'student__email', 'lesson__title', 'lesson__course__title')
    list_filter = ('lesson__course', 'completed_at')
    ordering = ('-completed_at',)

    def get_readonly_fields(self, request, obj=None):
        """
        Make fields readonly if the object already exists.
        """
        if obj:  
            return ['student', 'lesson', 'completed_at']
        return []