from django.views import View
from django.shortcuts import render
from django.http import JsonResponse
from django.contrib.contenttypes.models import ContentType
import pghistory

def serialize_event(event):
    """Serialize a history event for JSON response"""
    return {
        'label': event.pgh_label,
        'created_at': event.pgh_created_at.isoformat(),
        'context': event.pgh_context,
        'data': event.pgh_data,
    }

class HistoryTimelineView(View):
    """View for displaying object history timeline"""
    
    def get(self, request, content_type_id, object_id):
        # Get content type and object
        content_type = ContentType.objects.get_for_id(content_type_id)
        obj = content_type.get_object_for_this_type(id=object_id)

        # Get history events
        events = pghistory.models.Event.objects.filter(
            pgh_obj_model=content_type.model_class(),
            pgh_obj_id=object_id
        ).order_by('-pgh_created_at')[:25]

        context = {
            'events': events,
            'content_type': content_type,
            'object': obj,
        }

        if request.htmx:
            return render(request, "history/partials/history_timeline.html", context)
            
        return JsonResponse({
            'history': [serialize_event(e) for e in events]
        })