Trend + EMA

//@version=2
strategy("Trend + EMA", overlay=true, initial_capital=10000, currency=currency.USD, pyramiding=0)

tim=input("180", title="Period for trend")
ema_period=input(180, type=integer, title="EMA period")

opn = security(tickerid, tim, open)
cls = security(tickerid, tim, close)

emaline = ema(close, ema_period)

plot(opn, color=red)
plot(cls, color=green)
plot(emaline, color=black)

if (crossover(low, emaline))
    strategy.entry("long", strategy.long)

if (crossover(cls, opn) and emaline < opn and strategy.position_size == 0)
    strategy.entry("long", strategy.long)

if (crossunder(cls, opn) and strategy.position_size > 0)
    strategy.close_all()

if (crossunder(high, emaline) and high < emaline)
    strategy.entry("short", strategy.short)

if (crossunder(cls, opn) and emaline > opn and strategy.position_size == 0)
    strategy.entry("short", strategy.short)

if (crossover(cls, opn) and strategy.position_size < 0)
    strategy.close_all()