/*
Copyright 2024 Rancher Labs, Inc.

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.
*/

// Code generated by main. DO NOT EDIT.

package v3

import (
	"context"
	"sync"
	"time"

	v3 "github.com/rancher/rancher/pkg/apis/management.cattle.io/v3"
	"github.com/rancher/wrangler/v3/pkg/apply"
	"github.com/rancher/wrangler/v3/pkg/condition"
	"github.com/rancher/wrangler/v3/pkg/generic"
	"github.com/rancher/wrangler/v3/pkg/kv"
	"k8s.io/apimachinery/pkg/api/equality"
	"k8s.io/apimachinery/pkg/api/errors"
	"k8s.io/apimachinery/pkg/runtime"
	"k8s.io/apimachinery/pkg/runtime/schema"
)

// NodeController interface for managing Node resources.
type NodeController interface {
	generic.ControllerInterface[*v3.Node, *v3.NodeList]
}

// NodeClient interface for managing Node resources in Kubernetes.
type NodeClient interface {
	generic.ClientInterface[*v3.Node, *v3.NodeList]
}

// NodeCache interface for retrieving Node resources in memory.
type NodeCache interface {
	generic.CacheInterface[*v3.Node]
}

// NodeStatusHandler is executed for every added or modified Node. Should return the new status to be updated
type NodeStatusHandler func(obj *v3.Node, status v3.NodeStatus) (v3.NodeStatus, error)

// NodeGeneratingHandler is the top-level handler that is executed for every Node event. It extends NodeStatusHandler by a returning a slice of child objects to be passed to apply.Apply
type NodeGeneratingHandler func(obj *v3.Node, status v3.NodeStatus) ([]runtime.Object, v3.NodeStatus, error)

// RegisterNodeStatusHandler configures a NodeController to execute a NodeStatusHandler for every events observed.
// If a non-empty condition is provided, it will be updated in the status conditions for every handler execution
func RegisterNodeStatusHandler(ctx context.Context, controller NodeController, condition condition.Cond, name string, handler NodeStatusHandler) {
	statusHandler := &nodeStatusHandler{
		client:    controller,
		condition: condition,
		handler:   handler,
	}
	controller.AddGenericHandler(ctx, name, generic.FromObjectHandlerToHandler(statusHandler.sync))
}

// RegisterNodeGeneratingHandler configures a NodeController to execute a NodeGeneratingHandler for every events observed, passing the returned objects to the provided apply.Apply.
// If a non-empty condition is provided, it will be updated in the status conditions for every handler execution
func RegisterNodeGeneratingHandler(ctx context.Context, controller NodeController, apply apply.Apply,
	condition condition.Cond, name string, handler NodeGeneratingHandler, opts *generic.GeneratingHandlerOptions) {
	statusHandler := &nodeGeneratingHandler{
		NodeGeneratingHandler: handler,
		apply:                 apply,
		name:                  name,
		gvk:                   controller.GroupVersionKind(),
	}
	if opts != nil {
		statusHandler.opts = *opts
	}
	controller.OnChange(ctx, name, statusHandler.Remove)
	RegisterNodeStatusHandler(ctx, controller, condition, name, statusHandler.Handle)
}

type nodeStatusHandler struct {
	client    NodeClient
	condition condition.Cond
	handler   NodeStatusHandler
}

// sync is executed on every resource addition or modification. Executes the configured handlers and sends the updated status to the Kubernetes API
func (a *nodeStatusHandler) sync(key string, obj *v3.Node) (*v3.Node, error) {
	if obj == nil {
		return obj, nil
	}

	origStatus := obj.Status.DeepCopy()
	obj = obj.DeepCopy()
	newStatus, err := a.handler(obj, obj.Status)
	if err != nil {
		// Revert to old status on error
		newStatus = *origStatus.DeepCopy()
	}

	if a.condition != "" {
		if errors.IsConflict(err) {
			a.condition.SetError(&newStatus, "", nil)
		} else {
			a.condition.SetError(&newStatus, "", err)
		}
	}
	if !equality.Semantic.DeepEqual(origStatus, &newStatus) {
		if a.condition != "" {
			// Since status has changed, update the lastUpdatedTime
			a.condition.LastUpdated(&newStatus, time.Now().UTC().Format(time.RFC3339))
		}

		var newErr error
		obj.Status = newStatus
		newObj, newErr := a.client.UpdateStatus(obj)
		if err == nil {
			err = newErr
		}
		if newErr == nil {
			obj = newObj
		}
	}
	return obj, err
}

type nodeGeneratingHandler struct {
	NodeGeneratingHandler
	apply apply.Apply
	opts  generic.GeneratingHandlerOptions
	gvk   schema.GroupVersionKind
	name  string
	seen  sync.Map
}

// Remove handles the observed deletion of a resource, cascade deleting every associated resource previously applied
func (a *nodeGeneratingHandler) Remove(key string, obj *v3.Node) (*v3.Node, error) {
	if obj != nil {
		return obj, nil
	}

	obj = &v3.Node{}
	obj.Namespace, obj.Name = kv.RSplit(key, "/")
	obj.SetGroupVersionKind(a.gvk)

	if a.opts.UniqueApplyForResourceVersion {
		a.seen.Delete(key)
	}

	return nil, generic.ConfigureApplyForObject(a.apply, obj, &a.opts).
		WithOwner(obj).
		WithSetID(a.name).
		ApplyObjects()
}

// Handle executes the configured NodeGeneratingHandler and pass the resulting objects to apply.Apply, finally returning the new status of the resource
func (a *nodeGeneratingHandler) Handle(obj *v3.Node, status v3.NodeStatus) (v3.NodeStatus, error) {
	if !obj.DeletionTimestamp.IsZero() {
		return status, nil
	}

	objs, newStatus, err := a.NodeGeneratingHandler(obj, status)
	if err != nil {
		return newStatus, err
	}
	if !a.isNewResourceVersion(obj) {
		return newStatus, nil
	}

	err = generic.ConfigureApplyForObject(a.apply, obj, &a.opts).
		WithOwner(obj).
		WithSetID(a.name).
		ApplyObjects(objs...)
	if err != nil {
		return newStatus, err
	}
	a.storeResourceVersion(obj)
	return newStatus, nil
}

// isNewResourceVersion detects if a specific resource version was already successfully processed.
// Only used if UniqueApplyForResourceVersion is set in generic.GeneratingHandlerOptions
func (a *nodeGeneratingHandler) isNewResourceVersion(obj *v3.Node) bool {
	if !a.opts.UniqueApplyForResourceVersion {
		return true
	}

	// Apply once per resource version
	key := obj.Namespace + "/" + obj.Name
	previous, ok := a.seen.Load(key)
	return !ok || previous != obj.ResourceVersion
}

// storeResourceVersion keeps track of the latest resource version of an object for which Apply was executed
// Only used if UniqueApplyForResourceVersion is set in generic.GeneratingHandlerOptions
func (a *nodeGeneratingHandler) storeResourceVersion(obj *v3.Node) {
	if !a.opts.UniqueApplyForResourceVersion {
		return
	}

	key := obj.Namespace + "/" + obj.Name
	a.seen.Store(key, obj.ResourceVersion)
}
