import json
import base64
import requests
import traceback
from django.http import JsonResponse
from django.views.generic import TemplateView, View

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

class ClusterGraphDataView(View):
    """
    Die Diagnose-Schnittstelle: Fängt jeden Fehler global ab 
    und liefert den echten Python-Fehler als Text zurück!
    """
    def get(self, request, *args, **kwargs):
        # Wir umschließen die ABSOLUT GESAMTE Funktion mit einem globalen Sicherheitsnetz
        try:
            repo_name = request.GET.get("repo", "boday_tf")
            consul_url = f"http://consul:8500/v1/kv/terraform/states/{repo_name}"
            
            response = requests.get(consul_url, timeout=5)
            if response.status_code == 404:
                return JsonResponse({
                    "name": f"Warte auf Consul-Key '{repo_name}'...", 
                    "type": "Root", 
                    "children": []
                })
            
            consul_data = response.json()
            
            # WICHTIG: Consul liefert im KV-Store IMMER eine Liste zurück! [ {"LockIndex": 0, "Key": "...", "Value": "..."} ]
            if isinstance(consul_data, list) and len(consul_data) > 0:
                raw_value = consul_data[0].get("Value")
            else:
                raw_value = consul_data.get("Value") if hasattr(consul_data, "get") else None

            if not raw_value:
                return JsonResponse({
                    "name": f"Key '{repo_name}' geladen, aber Value ist leer.", 
                    "type": "Root", 
                    "children": []
                })
            
            # Base64 decodieren
            state_json = json.loads(base64.b64decode(raw_value).decode('utf-8'))
            
            # Flache Ressourcen parsen
            resources = state_json.get("resources", [])
            ingresses = []
            services = {}
            deployments = {}

            for res in resources:
                res_type = res.get("type")
                res_name = res.get("name")
                
                # Attribut-Struktur sicher 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

                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 in ["kubernetes_ingress_v1", "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"}

            root_node = {
                "name": f"Consul Storage: {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)

            return JsonResponse(root_node)

        except Exception as e:
            # DIE RETTUNG: Falls IRGENDWAS crasht, fangen wir es ab und senden den Fehler als HTTP 200 Text!
            error_msg = f"Fehler: {str(e)} -> Traceback: {traceback.format_exc()}"
            return JsonResponse({
                "name": "cloudmon // Diagnose-Modus",
                "type": "Root",
                "error_details": error_msg,
                "children": []
            })