/*
Copyright © 2022 SUSE LLC

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 syncer

import (
	"context"
	"encoding/json"
	"fmt"
	"io"
	"net/http"
	"time"

	elementalv1 "github.com/rancher/elemental-operator/api/v1beta1"
	"k8s.io/apimachinery/pkg/api/meta"
	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
	ctrl "sigs.k8s.io/controller-runtime"
	"sigs.k8s.io/controller-runtime/pkg/client"
)

type JSONSyncer struct {
	URI     string `json:"uri"`
	Timeout string `json:"timeout"`
}

// Sync attemps to get a list of managed os versions based on the managed os version channel configuration, on success it updates the ready condition
func (j *JSONSyncer) Sync(ctx context.Context, cl client.Client, ch *elementalv1.ManagedOSVersionChannel) ([]elementalv1.ManagedOSVersion, error) {
	logger := ctrl.LoggerFrom(ctx)
	logger.Info("Syncing (JSON)", "ManagedOSVersionChannel", ch.Name)

	timeout := time.Second * 30
	if j.Timeout != "" {
		var err error
		timeout, err = time.ParseDuration(j.Timeout)
		if err != nil {
			return nil, fmt.Errorf("failed to parse timeout: %w", err)
		}
	}
	client := &http.Client{
		Timeout: timeout,
	}

	logger.V(5).Info("Fetching JSON from ", j.URI)
	resp, err := client.Get(j.URI)
	if err != nil {
		return nil, fmt.Errorf("failed to get %s: %w", j.URI, err)
	}

	buf, err := io.ReadAll(resp.Body)
	if err != nil {
		return nil, fmt.Errorf("failed to read response body: %w", err)
	}
	res := []elementalv1.ManagedOSVersion{}

	err = json.Unmarshal(buf, &res)
	if err != nil {
		return nil, fmt.Errorf("failed to unmarshal JSON: %w", err)
	}

	meta.SetStatusCondition(&ch.Status.Conditions, metav1.Condition{
		Type:    elementalv1.ReadyCondition,
		Reason:  elementalv1.GotChannelDataReason,
		Status:  metav1.ConditionFalse,
		Message: "Got valid channel data",
	})

	return res, nil
}