//@version=3
//

study(title = "Open Close Cross Strategy R5.1 revised by JustUncleL", shorttitle = "OCC Strategy R5.1", overlay = true), // pyramiding = 0, default_qty_type = strategy.percent_of_equity, default_qty_value = 10, calc_on_every_tick=false)

//
// Revision:        5
// Original Author: @JayRogers
// Revision Author: JustUncleL revisions 3, 4, 5
//
// *** USE AT YOUR OWN RISK ***
//  - There are drawing/painting issues in pinescript when working across resolutions/timeframes that I simply
//    cannot fix here.. I will not be putting any further effort into developing this until such a time when
//    workarounds become available.
//    NOTE: Re-painting has been observed infrequently with default settings and seems OK up to Alternate
//          multiplier of 5.
//          Non-repainting mode is available by setting "Delay Open/Close MA" to 1 or more, but the reported
//          performance will drop dramatically.
//
// R5.1 Changes by JustUncleL
//  - Upgraded to Version 3 Pinescript.
//  - Added option to select Trade type (Long, Short, Both or None)
//  - Added bar colouring work around patch.
//  - Small code changes to improve efficiency.
//  - NOTE: To enable non-Repainting mode set "Delay Open/Close MA" to 1 or more.
//  9-Aug-2017
//  - Correction on SuperSmooth MA calculation.
//
// R5 Changes by JustUncleL
//  - Corrected cross over calculations, sometimes gave false signals.
//  - Corrected Alternate Time calculation to allow for Daily,Weekly and Monthly charts.
//  - Open Public release.
// R4 Changes By JustUncleL
//  - Change the way the Alternate resolution in selected, use a Multiplier of the base Time Frame instead,
//    this makes it easy to switch between base time frames.
//  - Added TMA and SSMA moving average options. But DEMA is still giving the best results.
//  - Using "calc_on_every_tick=false" ensures results between backtesting and real time are similar.
//  - Added Option to Disable the coloring of the bars.
//  - Updated default settings.
//
// R3 Changes by JustUncleL:
//  - Returned a simplified version of the open/close channel, it shows strength of current trend.
//  - Added Target Profit Option.
//  - Added option to reduce the number of historical bars, overcomes the too many trades limit error.
//  - Simplified the strategy code.
//  - Removed Trailing Stop option, not required and in my opion does not work well in Trading View,
//    it also gives false and unrealistic performance results in backtesting.
//
// R2 Changes:
//  - Simplified and cleaned up plotting, now just shows a Moving Average derived from the average of open/close.
//  - Tried very hard to alleviate painting issues caused by referencing alternate resolution..
//
// Description:
//  - Strategy based around Open-Close Crossovers.
// Setup:
//  - I have generally found that setting the strategy resolution to 3-4x that of the chart you are viewing
//    tends to yield the best results, regardless of which MA option you may choose (if any) BUT can cause
//    a lot of false positives - be aware of this
//  - Don't aim for perfection. Just aim to get a reasonably snug fit with the O-C band, with good runs of
//    green and red.
//  - Option to either use basic open and close series data, or pick your poison with a wide array of MA types.
//  - Optional trailing stop for damage mitigation if desired (can be toggled on/off)
//  - Positions get taken automagically following a crossover - which is why it's better to set the resolution
//    of the script greater than that of your chart, so that the trades get taken sooner rather than later.
//  - If you make use of the stops, be sure to take your time tweaking the values. Cutting it too fine
//    will cost you profits but keep you safer, while letting them loose could lead to more drawdown than you
//    can handle.
//  - To enable non-Repainting mode set "Delay Open/Close MA" to 1 or more.
//

// === INPUTS ===
useRes      = input(defval = true, title = "Use Alternate Resolution?")
intRes      = input(defval = 120,    title = "Multiplier for Alernate Resolution")
stratRes    = ismonthly? tostring(interval*intRes,"###M") : isweekly? tostring(interval*intRes,"###W") : isdaily?  tostring(interval*intRes,"###D") : isintraday ? tostring(interval*intRes,"####") : '60'
basisType   = input(defval = "SMMA", title = "MA Type: ", options=["SMA", "EMA", "DEMA", "TEMA", "WMA", "VWMA", "SMMA", "HullMA", "LSMA", "ALMA", "SSMA", "TMA"])
basisLen    = input(defval = 8, title = "MA Period", minval = 1)
offsetSigma = input(defval = 6, title = "Offset for LSMA / Sigma for ALMA", minval = 0)
offsetALMA  = input(defval = 0.85, title = "Offset for ALMA", minval = 0, step = 0.01)
scolor      = input(false, title="Show coloured Bars to indicate Trend?")
delayOffset = input(defval = 0, title = "Delay Open/Close MA (Forces Non-Repainting)", minval = 0, step = 1)
tradeType   = input("BOTH", title="What trades should be taken : ", options=["LONG", "SHORT", "BOTH", "NONE"])
// === /INPUTS ===

// Constants colours that include fully non-transparent option.
green100 = #008000FF
lime100  = #00FF00FF
red100   = #FF0000FF
blue100  = #0000FFFF
aqua100  = #00FFFFFF
darkred100 = #8B0000FF
gray100 = #808080FF

// === BASE FUNCTIONS ===
// Returns MA input selection variant, default to SMA if blank or typo.
variant(type, src, len, offSig, offALMA) =>
    v1 = sma(src, len)                                                  // Simple
    v2 = ema(src, len)                                                  // Exponential
    v3 = 2 * v2 - ema(v2, len)                                          // Double Exponential
    v4 = 3 * (v2 - ema(v2, len)) + ema(ema(v2, len), len)               // Triple Exponential
    v5 = wma(src, len)                                                  // Weighted
    v6 = vwma(src, len)                                                 // Volume Weighted
    v7 = 0.0
    v7 := na(v7[1]) ? sma(src, len) : (v7[1] * (len - 1) + src) / len    // Smoothed
    v8 = wma(2 * wma(src, len / 2) - wma(src, len), round(sqrt(len)))   // Hull
    v9 = linreg(src, len, offSig)                                       // Least Squares
    v10 = alma(src, len, offALMA, offSig)                               // Arnaud Legoux
    v11 = sma(v1,len)                                                   // Triangular (extreme smooth)
    // SuperSmoother filter
    // © 2013  John F. Ehlers
    a1 = exp(-1.414*3.14159 / len)
    b1 = 2*a1*cos(1.414*3.14159 / len)
    c2 = b1
    c3 = (-a1)*a1
    c1 = 1 - c2 - c3
    v12 = 0.0
    v12 := c1*(src + nz(src[1])) / 2 + c2*nz(v12[1]) + c3*nz(v12[2])
    type=="EMA"?v2 : type=="DEMA"?v3 : type=="TEMA"?v4 : type=="WMA"?v5 : type=="VWMA"?v6 : type=="SMMA"?v7 : type=="HullMA"?v8 : type=="LSMA"?v9 : type=="ALMA"?v10 : type=="TMA"?v11: type=="SSMA"?v12: v1

// security wrapper for repeat calls
reso(exp, use, res) => use ? security(tickerid, res, exp, gaps=barmerge.gaps_off, lookahead=barmerge.lookahead_on) : exp

// === /BASE FUNCTIONS ===

// === SERIES SETUP ===
closeSeries     = variant(basisType, close[delayOffset], basisLen, offsetSigma, offsetALMA)
openSeries      = variant(basisType, open[delayOffset], basisLen, offsetSigma, offsetALMA)
// === /SERIES ===

// === PLOTTING ===

// Get Alternate resolution Series if selected.
closeSeriesAlt = reso(closeSeries, useRes, stratRes)
openSeriesAlt = reso(openSeries, useRes, stratRes)
//
trendColour = (closeSeriesAlt > openSeriesAlt) ? green : red
bcolour     = (closeSeries > openSeriesAlt) ? lime100 : red100
barcolor(scolor?bcolour:na, title = "Bar Colours")
closeP=plot(closeSeriesAlt, title = "Close Series", color = trendColour, linewidth = 2, style = line, transp = 20)
openP=plot(openSeriesAlt, title = "Open Series", color = trendColour, linewidth = 2, style = line, transp = 20)
fill(closeP,openP,color=trendColour,transp=80)

// === /PLOTTING ===
//

//
// === ALERT conditions


// === /ALERT conditions.

// === STRATEGY ===
// stop loss
slPoints    = input(defval = 0, title = "Initial Stop Loss Points (zero to disable)", minval = 0)
tpPoints    = input(defval = 0, title = "Initial Target Profit Points (zero for disable)", minval = 0)
// Include bar limiting algorithm
ebar            = input(defval = 10000, title="Number of Bars for Back Testing", minval=0)
dummy           = input(false,        title="- SET to ZERO for Daily or Longer Timeframes" )
//
// Calculate how many mars since last bar
tdays       = (timenow-time)/60000.0  // number of minutes since last bar
tdays       := ismonthly? tdays/1440.0/5.0/4.3/interval : isweekly? tdays/1440.0/5.0/interval : isdaily? tdays/1440.0/interval : tdays/interval // number of bars since last bar
//
//set up exit parameters
TP = tpPoints>0?tpPoints:na
SL = slPoints>0?slPoints:na

// Make sure we are within the bar range, Set up entries and exit conditions
//if ((ebar==0 or tdays<=ebar) and tradeType!="NONE")
//    strategy.entry("long", strategy.long, when=longCond==true and tradeType!="SHORT")
//    strategy.entry("short", strategy.short, when=shortCond==true and tradeType!="LONG")
//    strategy.close("long", when = shortCond==true and tradeType=="LONG")
//    strategy.close("short", when = longCond==true and tradeType=="SHORT")
//    strategy.exit("XL", from_entry = "long", profit = TP, loss = SL)
//    strategy.exit("XS", from_entry = "short", profit = TP, loss = SL)
//
// === /STRATEGY ===
// eof

resCustom = input(title="Use Different Timeframe? Uncheck Box Above", defval="120")
useCurrentRes = input(true, title="Use Current Chart Resolution?")
res = resCustom

length1 = input(50, minval=1), smoothK1 = input(10, minval=1), smoothD1 = input(10, minval=1)
k1 = security(tickerid, res,sma(stoch(close, close, close, length1), smoothK1))
d1 = security(tickerid, res,sma(k1, smoothD1))
col1 = k1 > d1

xlong       = crossover(closeSeriesAlt, openSeriesAlt)
xshort      = crossunder(closeSeriesAlt, openSeriesAlt)
longCond    = xlong and tdays   // alternative: longCond[1]? false : (xlong or xlong[1]) and close>closeSeriesAlt and close>=open
shortCond   = xshort  and tdays    // alternative: shortCond[1]? false : (xshort or xshort[1]) and close<closeSeriesAlt and close<=open

plot(cross(closeSeriesAlt, openSeriesAlt) ? closeSeriesAlt : na, style = circles, linewidth = 8, transp=0, color= black,title= "Alarm")


alertcondition(longCond, title='Buy Alert', message='Buy Alert')
plotshape(longCond, "Buy Alert", style = shape.triangleup, location = location.belowbar, color = blue, size = size.small,text="[Buy]",transp=0)

alertcondition(shortCond, title='Sell Alert', message='Sell Alert')
plotshape(shortCond, "Sell Alert", style = shape.triangledown, location = location.abovebar, color = purple, size = size.small,text="[Sell]",transp=0)