package internal

import (
	"context"
	"fmt"
	"time"

	"github.com/kelseyhightower/envconfig"
	"github.com/redis/go-redis/v9"
)

const (
	redisPingTimeout = 10 * time.Second
)

type redisConfig struct {
	ConnectionString string `envconfig:"CONNECTION_STRING" required:"true"`
}

func NewRedisClient() (*redis.Client, error) {
	var cfg redisConfig
	if err := envconfig.Process("REDIS", &cfg); err != nil {
		return nil, fmt.Errorf("envconfig.Process: %w", err)
	}

	opts, err := redis.ParseURL(cfg.ConnectionString)
	if err != nil {
		return nil, fmt.Errorf("couldn't parse REDIS_CONNECTION_STRING: %w", err)
	}

	c := redis.NewClient(opts)

	ctx, cancel := context.WithTimeout(context.Background(), redisPingTimeout)
	defer cancel()
	if err = c.Ping(ctx).Err(); err != nil {
		_ = c.Close()
		return nil, fmt.Errorf("couldn't ping redis: %w", err)
	}

	return c, nil
}