/*
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"
	"maps"
	"strings"

	"github.com/LocoStack/loco-operator/api/v1alpha1"
	batchv1 "k8s.io/api/batch/v1"
	v1 "k8s.io/api/core/v1"
	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 JobReconciler struct {
	client    client.Client
	scheme    *runtime.Scheme
	stack     *v1alpha1.Stack
	component string
	name      string
	owner     metav1.Object
}

func NewJobReconciler(client client.Client, scheme *runtime.Scheme, stack *v1alpha1.Stack, component, name string, owner metav1.Object) *JobReconciler {
	return &JobReconciler{
		client:    client,
		scheme:    scheme,
		stack:     stack,
		component: component,
		name:      fmt.Sprintf("%s-%s", strings.ToLower(component), name),
		owner:     owner,
	}
}

func (r *JobReconciler) ReconcileJob(ctx context.Context, tmpl *v1alpha1.Template, variables map[string]string) (bool, bool, error) {
	jobSpec, err := buildPodSpec(variables, tmpl)
	if err != nil {
		return false, true, fmt.Errorf("Failed to build job spec: %w", err)
	}
	jobSpec.RestartPolicy = v1.RestartPolicyOnFailure

	stackName := ""
	if r.stack != nil {
		stackName = r.stack.Name
	}
	labels := ResourceLabels(stackName, r.component, r.name, "")
	maps.Copy(labels, tmpl.Metadata.Labels)

	job := &batchv1.Job{ObjectMeta: metav1.ObjectMeta{Name: r.name, Namespace: r.owner.GetNamespace()}}
	jobCompleted := false
	jobFailed := false
	_, err = controllerutil.CreateOrUpdate(ctx, r.client, job, func() error {
		if job.CreationTimestamp.IsZero() {
			job.Labels = labels
			job.Spec = batchv1.JobSpec{
				Template: v1.PodTemplateSpec{
					ObjectMeta: metav1.ObjectMeta{
						Labels: labels,
					},
					Spec: jobSpec,
				},
			}
		}
		jobCompleted = job.Status.Succeeded >= 1
		jobFailed = job.Status.Failed >= 1
		return controllerutil.SetControllerReference(r.owner, job, r.scheme)
	})
	return jobCompleted, jobFailed, err
}