Combined Stochastic Oscillator and 123 Reversal Strategy

/*backtest
start: 2023-09-25 00:00:00
end: 2023-10-25 00:00:00
period: 1h
basePeriod: 15m
exchanges: [{"eid":"Futures_Binance","currency":"BTC_USDT"}]
*/

//@version=4
////////////////////////////////////////////////////////////
//  Copyright by HPotter v1.0 07/07/2021
// This is combo strategies for get a cumulative signal. 
//
// First strategy
// This System was created from the Book "How I Tripled My Money In The 
// Futures Market" by Ulf Jensen, Page 183. This is reverse type of strategies.
// The strategy buys at market, if close price is higher than the previous close 
// during 2 days and the meaning of 9-days Stochastic Slow Oscillator is lower than 50. 
// The strategy sells at market, if close price is lower than the previous close price 
// during 2 days and the meaning of 9-days Stochastic Fast Oscillator is higher than 50.
//
// Second strategy
// This back testing strategy generates a long trade at the Open of the following 
// bar when the %K line crosses up UpBand line.
// It generates a short trade at the Open of the following bar when the %K line 
// crosses down DownBand line.
//
// WARNING:
// - For purpose educate only
// - This script to change bars colors.
////////////////////////////////////////////////////////////
Reversal123(Length, KSmoothing, DLength, Level) =>
    vFast = sma(stoch(close, high, low, Length), KSmoothing) 
    vSlow = sma(vFast, DLength)
    pos = 0.0
    pos := iff(close[2] < close[1] and close > close[1] and vFast < vSlow and vFast > Level, 1,
	         iff(close[2] > close[1] and close < close[1] and vFast > vSlow and vFast < Level, -1, nz(pos[1], 0))) 
	pos


Stochastic(Length,DLength,UpBand,DownBand) =>
    pos = 0.0
    vFast = stoch(close, high, low, Length)
    vSlow = sma(vFast, DLength)
    pos := iff(vFast > UpBand, 1,
	         iff(vFast < DownBand, -1, nz(pos[1], 0))) 
    pos

strategy(title="Combo Backtest 123 Reversal & Stochastic", shorttitle="Combo", overlay = true)
line1 = input(true, "---- 123 Reversal ----")
Length = input(14, minval=1)
KSmoothing = input(1, minval=1)
DLength = input(3, minval=1)
Level = input(50, minval=1)
//-------------------------
line2 = input(true, "---- Stochastic ----")
LengthS = input(7, minval=1)
DLengthS = input(3, minval=1)
UpBand = input(20, minval=1)
DownBand = input(80, minval=1)
reverse = input(false, title="Trade reverse")
posReversal123 = Reversal123(Length, KSmoothing, DLength, Level)
posStochastic = Stochastic(LengthS,DLengthS,UpBand,DownBand)
pos = iff(posReversal123 == 1 and posStochastic == 1 , 1,
	   iff(posReversal123 == -1 and posStochastic == -1, -1, 0)) 
possig = iff(reverse and pos == 1, -1,
          iff(reverse and pos == -1 , 1, pos))	   
if (possig == 1 ) 
    strategy.entry("Long", strategy.long)
if (possig == -1 )
    strategy.entry("Short", strategy.short)	 
if (possig == 0) 
    strategy.close_all()
barcolor(possig == -1 ? #b50404: possig == 1 ? #079605 : #0536b3 )