Moving average system which waits for a better entry
// This source code is subject to the terms of the Mozilla Public License 2.0 at https://mozilla.org/MPL/2.0/
// © dongyun

//@version=4
strategy("等待一个更好的入场机会", overlay=true)

period = input(20,'')
maxwait = input(3,'')
threshold = input(0.01,'')

signal = 0
trend = 0.0
newtrend = 0.0
wait = 0.0
initialentry = 0.0

trend := sma(close,period)
signal := nz(signal[1])
if trend > nz(trend[1])
	signal := 1
else
	if trend < nz(trend[1])
		signal := -1

wait := nz(wait[1])
initialentry := nz(initialentry[1])

if signal != signal[1]
	if strategy.position_size > 0
		strategy.close('long',comment='trend sell')
		signal := -1
	else
		if strategy.position_size < 0
    		strategy.close('short',comment='trend buy')
    		signal := 1
	wait := 0
	initialentry := close
else
	if signal != 0 and strategy.position_size == 0
		wait := wait + 1

// test for better entry
if strategy.position_size == 0
	if wait >= maxwait
		if signal > 0
			strategy.entry('long',strategy.long, comment='maxtime Long')
		else
			if signal < 0
				strategy.entry('short',strategy.short, comment='maxtime Short')
	else
		if signal > 0 and close < initialentry - threshold
			strategy.entry('long',strategy.long, comment='delayed Long')
		else
			if signal < 0 and close > initialentry + threshold
				strategy.entry('short',strategy.short, comment='delayed short')
