package main

import (
	"fmt"
	"github.com/gomodule/redigo/redis"
	"time"
)

/**
newPool builds redis database connection
@param host string host:port of redis server
returns redis.Connection of connection to database
returns err from database connection
*/
func newPool(host string, username string, password string) *redis.Pool {
	return &redis.Pool{
		MaxIdle:   12000,
		MaxActive: 12000,
		Dial: func() (redis.Conn, error) {
			c, err := redis.Dial("tcp", host)
			if err != nil {
				panic(err.Error())
			}
			if username != "" && password != "" {
				_, err = c.Do("AUTH", password)
				if err != nil {
					c.Close()
					panic(err.Error())
				}
			}
			return c, err
		},
		TestOnBorrow: func(c redis.Conn, t time.Time) error {
			_, err := c.Do("PING")
			return err
		},
	}
}

/**
setRateTest sets key/value into database
@param rdbPtr connection is a pointer to the redis connection
@param key int redis key for the storage
@param value string string for the value to store
*/
func setRedis(rdbPtr *redis.Conn, key int, value string) {
	rdb := *rdbPtr
	//defer waitGroup.Done()
	_, err := rdb.Do("Set", key, value)
	if err != nil {
		fmt.Println(err, key, value)
		panic(err)
	}
}

/**
buildTestData iterates through a goroutine of setRedis to build test data into the redis db
@param redisPtr connection to redis
@param size int number of entries into the database
*/
func buildTestData(rdbPtr *redis.Conn, size int) {
	fmt.Println("Initializing Test Data...")
	for i := 1; i < size; i++ {
		key := i
		value := "ThisIsATestStringThatShouldBeReplacedWithSomethingMoreRandomMaybeFromAnInputOrCSV"
		setRedis(rdbPtr, key, value)
	}
	fmt.Println("Database Initialized...")
}

/**
getRedis queries the redis database for value of key
@param rdbPtr connection is a pointer to the redis connection
@param key int is key value to query in database
*/
func getRedis(rdbPtr *redis.Conn, key int, timesChan chan time.Duration, errorChan chan bool) {
	rdb := *rdbPtr
	startTime := time.Now()
	_, err := rdb.Do("Get", key)
	responseTime := time.Now().Sub(startTime)
	if err != nil {
		errorChan <- true
		fmt.Println("Unhandled error:", err)
	}
	timesChan <- responseTime
}