package setup

import (
	"context"
	"strings"
	"sync"
	"time"

	"forge.cadoles.com/cadoles/bouncer/internal/config"
	"github.com/pkg/errors"
	"github.com/redis/go-redis/v9"
	"gitlab.com/wpetit/goweb/logger"
)

var clients sync.Map

func NewSharedClient(conf config.RedisConfig) redis.UniversalClient {
	key := strings.Join(conf.Adresses, "|") + "|" + string(conf.Master)

	value, exists := clients.Load(key)
	if exists {
		if client, ok := (value).(redis.UniversalClient); ok {
			return client
		}
	}

	client := newRedisClient(conf)

	clients.Store(key, client)

	return client
}

func newRedisClient(conf config.RedisConfig) redis.UniversalClient {
	client := redis.NewUniversalClient(&redis.UniversalOptions{
		Addrs:                 conf.Adresses,
		MasterName:            string(conf.Master),
		ReadTimeout:           time.Duration(conf.ReadTimeout),
		WriteTimeout:          time.Duration(conf.WriteTimeout),
		DialTimeout:           time.Duration(conf.DialTimeout),
		RouteByLatency:        true,
		ContextTimeoutEnabled: true,
		MaxRetries:            int(conf.MaxRetries),
	})

	go func() {
		ctx := logger.With(context.Background(),
			logger.F("adresses", conf.Adresses),
			logger.F("master", conf.Master),
		)

		timer := time.NewTicker(time.Duration(conf.PingInterval))
		defer timer.Stop()

		connected := true

		for range timer.C {
			if _, err := client.Ping(ctx).Result(); err != nil {
				logger.Error(ctx, "redis disconnected", logger.E(errors.WithStack(err)))
				connected = false
				continue
			}

			if !connected {
				logger.Info(ctx, "redis reconnected")
				connected = true
			}
		}
	}()

	return client
}