package main

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

/**
getBurstTest starts goroutines for getRedis at the burstRateLimit per second
@param rdbPtr connection is a pointer to the redis connection
@param rate int requests per second for the test
@param keyMaxValue int max value to query the database and expect a return
*/
func getBurstTest(rdbPtr *redis.Conn, rate int, keyMaxValue int, duration time.Duration) {
	durationChannel := make(chan bool, 1)
	burstRateLimiter := time.Tick(time.Millisecond * 250)
	timesChan := make(chan time.Duration)
	errorChan := make(chan bool)
	endChan := make(chan bool)
	totalErrorChan := make(chan int)
	totalTimeChan := make(chan []int64)
	quaterRate := math.Abs(float64(rate) / 4)
	go func() {
		for i := 0; i < int(duration.Seconds()); i++ {
			<-time.Tick(time.Second)
		}
		durationChannel <- true
	}()

	go keepTotal(timesChan, errorChan, endChan, totalTimeChan, totalErrorChan)
	fmt.Println("Starting burst test at", quaterRate, "requests per 250 milliseconds...")
	end := false
	for {
		if end {
			break
		}
		select {
		case <-durationChannel:
			end = true
		case <-burstRateLimiter:
			for i := float64(0); i < quaterRate; i++ {
				//this might need toggled
				time.Sleep(time.Millisecond * 5)
				key := rand.Intn(keyMaxValue)
				go getRedis(rdbPtr, key, timesChan, errorChan)
			}
		}
	}

	endChan <- true
	totalTimesFloat := <-totalTimeChan
	totalErrors := <-totalErrorChan
	errorRate := totalErrors / len(totalTimesFloat)
	totalTimes := intToFloat(totalTimesFloat)
	mean, stddev, perc99, perc95 := getResponseTimes(totalTimes)
	fmt.Println("Burst test concluded...")
	fmt.Println("Total Requests:", len(totalTimesFloat))
	fmt.Println("Error Rate:", errorRate, "ms")
	fmt.Println("Mean:", mean, "ms")
	fmt.Println("Standard Deviation:", stddev, "ms")
	fmt.Println("95 Percentile:", perc95, "ms")
	fmt.Println("99 Percentile:", perc99, "ms")
}