/*
Copyright 2026 LocoStack.

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

    http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/

package reconciler

import (
	"context"
	"fmt"

	"github.com/LocoStack/loco-operator/api/v1alpha1"
	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
	"k8s.io/apimachinery/pkg/runtime"
	"sigs.k8s.io/controller-runtime/pkg/client"
	"sigs.k8s.io/controller-runtime/pkg/client/apiutil"
	logf "sigs.k8s.io/controller-runtime/pkg/log"
)

func ReconcileGatewayStatus(ctx context.Context, c client.Client, scheme *runtime.Scheme, stack string, obj client.Object) (*metav1.Condition, error) {
	log := logf.FromContext(ctx)

	if stack == "" {
		return &metav1.Condition{
			Type:               "GatewayBound",
			Status:             metav1.ConditionFalse,
			Reason:             "NoStackRef",
			Message:            "No stack reference provided",
			ObservedGeneration: obj.GetGeneration(),
		}, nil
	}

	gvk, err := apiutil.GVKForObject(obj, scheme)
	if err != nil {
		log.Error(err, "Failed to get GVK for object", "object", obj)
		return nil, err
	}

	gwList := &v1alpha1.ComponentList{}
	err = c.List(ctx, gwList, client.InNamespace(obj.GetNamespace()), client.MatchingLabels{"locostack.com/component": "Gateway"})
	if err != nil {
		log.Error(err, "Failed to list gateway Components", "namespace", obj.GetNamespace(), "stack", stack)
		return nil, err
	}
	gatewayFound := 0
	gatewayBound := 0
	for _, gw := range gwList.Items {
		if gw.Spec.StackRef.Name != stack {
			continue
		}
		gatewayFound += 1
		emStatus, hasKindStatus := gw.Status.Dependencies[gvk.Kind]
		if !hasKindStatus {
			continue
		}
		status, hasStatus := emStatus[obj.GetName()]
		if !hasStatus {
			continue
		}
		if status == obj.GetGeneration() {
			gatewayBound += 1
		}
	}
	if gatewayFound == 0 {
		return &metav1.Condition{
			Type:               "GatewayBound",
			Status:             metav1.ConditionFalse,
			Reason:             "GatewayNotFound",
			Message:            fmt.Sprintf("No gateway Components found that reference this %s in the Stack", gvk.Kind),
			ObservedGeneration: obj.GetGeneration(),
		}, nil
	} else if gatewayBound < gatewayFound {
		return &metav1.Condition{
			Type:               "GatewayBound",
			Status:             metav1.ConditionFalse,
			Reason:             "GatewayNotBound",
			Message:            fmt.Sprintf("%d out of %d gateway Components reference this %s in their status", gatewayBound, gatewayFound, gvk.Kind),
			ObservedGeneration: obj.GetGeneration(),
		}, nil
	} else {
		return &metav1.Condition{
			Type:               "GatewayBound",
			Status:             metav1.ConditionTrue,
			Reason:             "GatewayBound",
			Message:            fmt.Sprintf("All %d gateway Components reference this %s in their status", gatewayFound, gvk.Kind),
			ObservedGeneration: obj.GetGeneration(),
		}, nil
	}
}