import json
import logging
from django.http import JsonResponse
from django.views.generic import TemplateView, View
from django.utils.decorators import method_decorator
from django.views.decorators.csrf import csrf_exempt

logger = logging.getLogger(__name__)

# Globaler In-Memory Speicher
CLUSTER_STATES = {}

class DashboardView(TemplateView):
    template_name = "monitor/dashboard.html"

@method_decorator(csrf_exempt, name='dispatch')
class StatePushReceiverView(View):
    def post(self, request, *args, **kwargs):
        token = request.headers.get("Authorization")
        if token != "Bearer boday-cloudmon-super-token-2026":
            return JsonResponse({"error": "Unauthorized"}, status=401)

        try:
            tf_data = json.loads(request.body.decode('utf-8'))
            repo_name = request.GET.get("repo", "boday_tf")

            # KOMBI-PARSER: Erkennt automatisch, ob ein Plan-JSON oder ein State-JSON gepusht wurde
            resources = []
            if "values" in tf_data and "root_module" in tf_data["values"]:
                # Format aus 'terraform show -json' (Plan)
                resources = tf_data["values"]["root_module"].get("resources", [])
            elif "resources" in tf_data:
                # Format aus dem rohen '.tfstate' (State)
                resources = tf_data.get("resources", [])

            ingresses = []
            services = {}
            deployments = {}

            for res in resources:
                res_type = res.get("type")
                res_name = res.get("name")
                
                # Attribut-Extraktion je nach JSON-Typ flexibel auflösen
                instances = res.get("instances", [])
                if isinstance(instances, list) and len(instances) > 0:
                    attributes = instances[0].get("attributes", {})
                else:
                    attributes = res.get("values", {})

                if not attributes:
                    continue

                # JSON-Struktur-Normalisierung für Kubernetes-Metadaten
                metadata = attributes.get("metadata", [{}])
                actual_name = metadata[0].get("name", res_name) if isinstance(metadata, list) else metadata.get("name", res_name)

                if res_type == "kubernetes_ingress_v1" or res_type == "kubernetes_ingress":
                    spec = attributes.get("spec", [{}])
                    rules = spec[0].get("rule", []) if isinstance(spec, list) else spec.get("rule", [])
                    ingresses.append({
                        "name": actual_name,
                        "rules": rules
                    })
                elif res_type in ["kubernetes_service", "kubernetes_service_v1"]:
                    services[actual_name] = {"name": actual_name, "type": "Service"}
                elif res_type in ["kubernetes_deployment", "kubernetes_deployment_v1"]:
                    deployments[actual_name] = {"name": actual_name, "type": "Deployment"}

            # D3.js Baumhierarchie aufbauen
            root_node = {
                "name": f"Repository: {repo_name}",
                "type": "Root",
                "children": []
            }

            for ing in ingresses:
                ing_node = {"name": ing["name"], "type": "Ingress", "children": []}
                for rule in ing["rules"]:
                    http = rule.get("http", [{}])
                    paths = http[0].get("path", []) if isinstance(http, list) else http.get("path", [])
                    for path in paths:
                        backend = path.get("backend", [{}])
                        service_block = backend[0].get("service", {}) if isinstance(backend, list) else backend.get("service", {})
                        backend_svc = service_block.get("name")
                        
                        if backend_svc in services:
                            svc_node = {"name": backend_svc, "type": "Service", "children": []}
                            for dep_name in deployments.keys():
                                if dep_name in backend_svc or backend_svc in dep_name:
                                    svc_node["children"].append({"name": dep_name, "type": "Deployment", "children": []})
                            ing_node["children"].append(svc_node)
                root_node["children"].append(ing_node)

            CLUSTER_STATES[repo_name] = root_node
            return JsonResponse({"status": "success", "message": f"State für {repo_name} erfolgreich verarbeitet!"})

        except Exception as e:
            logger.error(f"Push-Verarbeitung fehlgeschlagen: {str(e)}")
            return JsonResponse({"error": str(e)}, status=400)

class ClusterGraphDataView(View):
    def get(self, request, *args, **kwargs):
        # Holt das spezifische Repo aus dem Query-Parameter, Fallback auf boday_tf
        repo_name = request.GET.get("repo", "bast/boday_tf")
        data = CLUSTER_STATES.get(repo_name, {
            "name": f"Warte auf Push für '{repo_name}'...",
            "type": "Root",
            "children": []
        })
        return JsonResponse(data)