/*
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 controller

import (
	"context"

	apierrors "k8s.io/apimachinery/pkg/api/errors"
	apimeta "k8s.io/apimachinery/pkg/api/meta"
	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
	"k8s.io/apimachinery/pkg/runtime"
	ctrl "sigs.k8s.io/controller-runtime"
	"sigs.k8s.io/controller-runtime/pkg/client"
	logf "sigs.k8s.io/controller-runtime/pkg/log"

	"github.com/LocoStack/loco-operator/api/v1alpha1"
	"github.com/LocoStack/loco-operator/internal/reconciler"
)

// ExternalToolReconciler reconciles a ExternalTool object
type ExternalToolReconciler struct {
	client.Client
	Scheme *runtime.Scheme
}

// +kubebuilder:rbac:groups=locostack.com,resources=externaltools,verbs=get;list;watch;create;update;patch;delete
// +kubebuilder:rbac:groups=locostack.com,resources=externaltools/status,verbs=get;update;patch
// +kubebuilder:rbac:groups=locostack.com,resources=externaltools/finalizers,verbs=update
// +kubebuilder:rbac:groups=locostack.com,resources=components,verbs=get;list;watch
// +kubebuilder:rbac:groups="",resources=secrets,verbs=get;list;watch

func (r *ExternalToolReconciler) Reconcile(ctx context.Context, req ctrl.Request) (ctrl.Result, error) {
	log := logf.FromContext(ctx)

	et := &v1alpha1.ExternalTool{}
	if err := r.Get(ctx, req.NamespacedName, et); err != nil {
		if apierrors.IsNotFound(err) {
			return ctrl.Result{}, nil
		}
		log.Error(err, "Failed to get ExternalTool", "namespace", req.NamespacedName.Namespace, "name", req.NamespacedName.Name)
		return ctrl.Result{}, err
	}

	patch := client.MergeFrom(et.DeepCopy())

	gatewayBound, err := r.reconcileGatewayStatus(ctx, et)
	if err != nil {
		log.Error(err, "Failed to reconcile gateway status for ExternalTool", "namespace", req.NamespacedName.Namespace, "name", req.NamespacedName.Name)
		return ctrl.Result{}, err
	}
	credentialsResolved, err := r.reconcileCredentials(ctx, et)
	if err != nil {
		log.Error(err, "Failed to reconcile credentials for ExternalTool", "namespace", req.NamespacedName.Namespace, "name", req.NamespacedName.Name)
		return ctrl.Result{}, err
	}

	if gatewayBound && credentialsResolved {
		apimeta.SetStatusCondition(&et.Status.Conditions, metav1.Condition{
			Type:               "Ready",
			Status:             metav1.ConditionTrue,
			Reason:             "AllPreconditionsMet",
			Message:            "Gateway exists and credentials resolve",
			ObservedGeneration: et.Generation,
		})
	} else {
		apimeta.SetStatusCondition(&et.Status.Conditions, metav1.Condition{
			Type:               "Ready",
			Status:             metav1.ConditionFalse,
			Reason:             "PreconditionsNotMet",
			Message:            "Gateway not found or credentials not resolved",
			ObservedGeneration: et.Generation,
		})
	}

	et.Status.ObservedGeneration = et.Generation
	if err := r.Status().Patch(ctx, et, patch); err != nil {
		return ctrl.Result{}, client.IgnoreNotFound(err)
	}

	log.Info("Reconciled ExternalTool", "namespace", et.Namespace, "name", et.Name)
	return ctrl.Result{}, nil
}

func (r *ExternalToolReconciler) reconcileGatewayStatus(ctx context.Context, et *v1alpha1.ExternalTool) (bool, error) {
	condition, err := reconciler.ReconcileGatewayStatus(ctx, r.Client, r.Scheme, et.Spec.StackRef.Name, et)
	if err != nil {
		return false, err
	}
	apimeta.SetStatusCondition(&et.Status.Conditions, *condition)
	return condition.Status == metav1.ConditionTrue, nil
}

func (r *ExternalToolReconciler) reconcileCredentials(ctx context.Context, et *v1alpha1.ExternalTool) (bool, error) {
	condition, err := reconciler.ReconcileCredentials(ctx, r.Client, r.Scheme, et.Spec.Auth, et)
	if err != nil {
		return false, err
	}
	apimeta.SetStatusCondition(&et.Status.Conditions, *condition)
	return condition.Status == metav1.ConditionTrue, nil
}

// SetupWithManager sets up the controller with the Manager.
func (r *ExternalToolReconciler) SetupWithManager(mgr ctrl.Manager) error {
	return ctrl.NewControllerManagedBy(mgr).
		For(&v1alpha1.ExternalTool{}).
		Watches(&v1alpha1.Component{}, ComponentEventHandler("ExternalTool")).
		Named("externaltool").
		Complete(r)
}