/*
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"
	"github.com/LocoStack/loco-operator/pkg/templates/downloader"
	corev1 "k8s.io/api/core/v1"
	"k8s.io/apimachinery/pkg/api/resource"
	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/controller/controllerutil"
)

type ArtifactReconciler struct {
	*JobReconciler
	client        client.Client
	scheme        *runtime.Scheme
	stack         *v1alpha1.Stack
	owner         metav1.Object
	artifactsSpec *v1alpha1.ArtifactSpec
}

func NewArtifactReconciler(client client.Client, scheme *runtime.Scheme, stack *v1alpha1.Stack, component string, owner metav1.Object, artifactsSpec *v1alpha1.ArtifactSpec) *ArtifactReconciler {
	return &ArtifactReconciler{
		JobReconciler: NewJobReconciler(
			client, scheme, stack, "Artifact", owner.GetName(), owner,
		),
		client:        client,
		scheme:        scheme,
		stack:         stack,
		owner:         owner,
		artifactsSpec: artifactsSpec,
	}
}

func (r *ArtifactReconciler) ReconcileArtifact(ctx context.Context) (*corev1.PersistentVolumeClaim, bool, bool, error) {
	var pvcName string
	if r.artifactsSpec.PVC != nil {
		pvcName = r.artifactsSpec.PVC.ClaimName
	} else {
		pvcName = fmt.Sprintf("%s-artifacts", r.owner.GetName())
	}
	pvc, err := r.reconcilePVC(ctx, pvcName)
	if err != nil {
		return nil, false, true, err
	}
	if r.artifactsSpec.HuggingFace != nil || r.artifactsSpec.URL != nil {
		variables := map[string]string{
			"spec.pvcName": pvcName,
		}
		var tmpl *v1alpha1.Template
		if r.artifactsSpec.HuggingFace != nil {
			hf := r.artifactsSpec.HuggingFace
			tmpl = downloader.HFDownloaderTemplate.DeepCopy()
			variables["spec.hfRepo"] = hf.Repo
			variables["spec.hfFilename"] = hf.FileName
			if hf.Revision == "" {
				variables["spec.hfRevision"] = "main"
			} else {
				variables["spec.hfRevision"] = hf.Revision
			}
			if hf.Endpoint != "" {
				variables["spec.hfEndpoint"] = hf.Endpoint
			} else {
				variables["spec.hfEndpoint"] = "https://huggingface.co"
			}
			if hf.TokenSecretRef != nil {
				variables["spec.hfToken.name"] = hf.TokenSecretRef.Name
				variables["spec.hfToken.key"] = hf.TokenSecretRef.Key
			} else {
				variables["spec.hfToken.name"] = "not-set"
				variables["spec.hfToken.key"] = "not-set"
			}
		} else if r.artifactsSpec.URL != nil {
			tmpl = downloader.URLDownloaderTemplate.DeepCopy()
			variables["spec.download"] = r.artifactsSpec.URL.URL
			variables["spec.fileName"] = r.artifactsSpec.URL.FileName
		}
		completed, failed, err := r.JobReconciler.ReconcileJob(ctx, tmpl, variables)
		if err != nil {
			return nil, false, true, err
		}
		return pvc, completed, failed, nil
	}
	return pvc, true, false, nil
}

func (r *ArtifactReconciler) reconcilePVC(ctx context.Context, pvcName string) (*corev1.PersistentVolumeClaim, error) {
	pvc := &corev1.PersistentVolumeClaim{ObjectMeta: metav1.ObjectMeta{
		Name:      pvcName,
		Namespace: r.owner.GetNamespace(),
	}}
	pvcNotFound := false
	if err := r.client.Get(ctx, client.ObjectKeyFromObject(pvc), pvc); err != nil {
		if client.IgnoreNotFound(err) != nil {
			return nil, fmt.Errorf("Failed to get PVC: %w", err)
		}
		pvcNotFound = true
	}
	if pvcNotFound {
		_, err := controllerutil.CreateOrUpdate(ctx, r.client, pvc, func() error {
			if pvc.CreationTimestamp.IsZero() {
				pvc.Labels = ResourceLabels(r.stack.Name, "Artifact", pvcName, "")
				pvc.Spec = corev1.PersistentVolumeClaimSpec{
					AccessModes: []corev1.PersistentVolumeAccessMode{corev1.ReadWriteOnce},
					Resources: corev1.VolumeResourceRequirements{
						Requests: corev1.ResourceList{
							corev1.ResourceStorage: resource.MustParse("30Gi"),
						},
					},
				}
			}
			return controllerutil.SetControllerReference(r.owner, pvc, r.scheme)
		})
		if err != nil {
			return nil, fmt.Errorf("Failed to create or update PVC: %w", err)
		}
	}
	return pvc, nil
}