/*

 Copyright 2019 The KubeSphere Authors.

 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 cache

import (
	"github.com/go-redis/redis"
	"k8s.io/klog"
	"time"
)

type Client struct {
	client *redis.Client
}

func NewRedisClient(option *Options, stopCh <-chan struct{}) (Interface, error) {
	var r Client

	options, err := redis.ParseURL(option.RedisURL)

	if err != nil {
		klog.Error(err)
		return nil, err
	}

	if stopCh == nil {
		klog.Warningf("no stop signal passed, may cause redis connections leaked")
	}

	r.client = redis.NewClient(options)

	if err := r.client.Ping().Err(); err != nil {
		klog.Error("unable to reach redis host", err)
		r.client.Close()
		return nil, err
	}

	// close redis in case of connection leak
	if stopCh != nil {
		go func() {
			<-stopCh
			if err := r.client.Close(); err != nil {
				klog.Error(err)
			}
		}()
	}

	return &r, nil
}

func (r *Client) Get(key string) (string, error) {
	return r.client.Get(key).Result()
}

func (r *Client) Keys(pattern string) ([]string, error) {
	return r.client.Keys(pattern).Result()
}

func (r *Client) Set(key string, value string, duration time.Duration) error {
	return r.client.Set(key, value, duration).Err()
}

func (r *Client) Del(keys ...string) error {
	return r.client.Del(keys...).Err()
}

func (r *Client) Exists(keys ...string) (bool, error) {
	existedKeys, err := r.client.Exists(keys...).Result()
	if err != nil {
		return false, err
	}

	return len(keys) == int(existedKeys), nil
}

func (r *Client) Expire(key string, duration time.Duration) error {
	return r.client.Expire(key, duration).Err()
}
