# AN-M007-B-AND-A — NexaScript port of Arrow.
#
# The skill you get first when you say "the arrow skill". Two mirrored machines
# (bull/bear): arm on a regular MACD correction against the regime, or on a
# confirmed hidden divergence at a pivot; release on a signal crossover or the
# hidden trigger; lock until the oscillator has recrossed zero, gated the whole
# time by a three-vote range filter (ADX, EMA separation, trend strength).
#
# Ported against an_m007_b_and_a.py, profile XAUUSD_M5_v0_1. Every seeded
# indicator here matches that module's own helpers, not TradingView:
#
#   atr(14, seed: "window")           - an_m007_b_and_a._atr
#   adx(14, seed: "window")           - an_m007_b_and_a._dmi (its own ADX
#                                        seeding, distinct even from the other
#                                        engines' window-seeded rma - see the
#                                        comment on asl/builtins._adx)
#
# The pivot ties default ("right": strict left, at-or-beyond right) matches
# this engine's own _pivot_low/_pivot_high, so no ties: override is needed -
# unlike AN-M001-BOS, which needed "none".
#
# `divosc` is the fast MACD *value*, not its histogram - the engine's default
# (div_source: MACD_VALUE). The port does not express the histogram variant;
# nothing in the shipped profile uses it.
#
# Locked/armed/hidden all reduce to scalars carried per side, which is why this
# is portable at all despite the length: no collection, just a lot of it.

skill "Arrow" {
  id AN-M007-B-AND-A
  use XAUUSD M5
  warmup 0

  let fast = ema(close, 12) - ema(close, 26)
  let fastSig = ema(fast, 9)
  let slow = ema(close, 48) - ema(close, 104)
  let ef = ema(close, 60)
  let es = ema(close, 240)
  let atrV = atr(14, seed: "window")
  let adxV = adx(14, seed: "window")
  let strengthAvg = sma(abs(slow), 50)
  let esSlope = es - es[10]
  let slopeRatio = abs(esSlope) / max(atrV, 0.01)

  let bullReg = slow > 0
  let bearReg = slow < 0

  let emaBuyOk = ef > es and esSlope > 0 and slopeRatio >= 0.05
  let emaSellOk = ef < es and esSlope < 0 and slopeRatio >= 0.05
  let adxOk = adxV >= 20
  let emaSepOk = abs(ef - es) / max(atrV, 0.01) >= 0.2
  let strengthOk = abs(slow) > strengthAvg * 0.5
  let votes = if(adxOk, 1, 0) + if(emaSepOk, 1, 0) + if(strengthOk, 1, 0)
  let rangeOk = votes >= 2

  let pivLo = pivot_low(left: 3, right: 3)
  let pivHi = pivot_high(left: 3, right: 3)
  # The oscillator's value AT the pivot bar - not the confirming bar three bars
  # later - which is what fast[3] reaches back to when .confirmed is true.
  let oscAtPivot = fast[3]

  machine bull {
    var locked = 0
    var sawPositiveAfterLock = 0
    var correctionArmed = 0
    var depth = 0
    var hiddenArmed = 0
    var hiddenArmedBar = -1000
    var hiddenOrigin = -1
    var prevLowPrice = 0
    var prevLowOsc = 0
    var prevLowBar = -1000
    var lastBuyBar = -1000

    let dCorrArmed = if(bullReg == 0, 0, correctionArmed)
    let dDepth = if(bullReg == 0, 0, depth)
    let dHiddenArmed = if(bullReg == 0, 0, hiddenArmed)
    let dHiddenOrigin = if(bullReg == 0, -1, hiddenOrigin)

    let sawPos = if(locked == 1, if(sawPositiveAfterLock == 1 or fast > 0, 1, 0), sawPositiveAfterLock)
    let unlocks = locked == 1 and sawPos == 1 and fast <= 0 and bullReg
    let lLocked = if(unlocks, 0, locked)
    let lSawPos = if(unlocks, 0, sawPos)
    let cCorrArmed = if(unlocks, 1, dCorrArmed)
    let cDepth = if(unlocks, abs(fast), dDepth)

    let arms = bullReg and fast < 0 and lLocked == 0
    let eCorrArmed = if(arms, 1, cCorrArmed)
    let eDepth = if(arms, max(cDepth, abs(fast)), cDepth)

    let minDepth = 0.05 * max(atrV, 0.01)
    let depthOk = eCorrArmed == 1 and eDepth >= minDepth

    let pivotDist = pivLo.bar - prevLowBar
    let pivotDistOk = prevLowBar > -1000 and pivotDist >= 5 and pivotDist <= 100
    let hiddenConfirmed = pivLo.confirmed and bullReg and lLocked == 0 and depthOk and pivotDistOk
      and prevLowBar > -1000 and pivLo.price > prevLowPrice and oscAtPivot < prevLowOsc
    let nPrevLowPrice = if(pivLo.confirmed, pivLo.price, prevLowPrice)
    let nPrevLowOsc = if(pivLo.confirmed, oscAtPivot, prevLowOsc)
    let nPrevLowBar = if(pivLo.confirmed, pivLo.bar, prevLowBar)

    let fHiddenArmed = if(hiddenConfirmed, 1, dHiddenArmed)
    let fHiddenArmedBar = if(hiddenConfirmed, bar_index, hiddenArmedBar)
    let fHiddenOrigin = if(hiddenConfirmed, pivLo.bar, dHiddenOrigin)
    let expires = fHiddenArmed == 1 and (bullReg == 0 or bar_index - fHiddenArmedBar > 20)
    let gHiddenArmed = if(expires, 0, fHiddenArmed)
    let gHiddenOrigin = if(expires, -1, fHiddenOrigin)

    let buyRel = bullReg and lLocked == 0 and depthOk and crossover(fast, fastSig) and fast < 0
    let buyHid = gHiddenArmed == 1 and bullReg and lLocked == 0 and crossover(fast, fastSig)
    let buyType = if(buyRel and buyHid, 3, if(buyHid, 2, if(buyRel, 1, 0)))
    let buyBarsOk = bar_index - lastBuyBar >= 20
    let buyFilters = bullReg and emaBuyOk and rangeOk
    let buyAccept = buyType > 0 and buyFilters and buyBarsOk

    # buyType 1/2/3 is a real distinction the engine makes in its event_type -
    # RELEASE (plain crossover), HIDDEN (a confirmed hidden divergence
    # triggered it), COMBINED (both at once) - not three names for one thing.
    # One transition per type, same guard split three ways.
    IDLE -> IDLE when buyType == 1 and buyAccept emit BA_BUY_RELEASE
      set locked = 1 set sawPositiveAfterLock = if(fast > 0, 1, 0)
      set correctionArmed = 0 set depth = 0 set hiddenArmed = 0
      set hiddenArmedBar = -1000 set hiddenOrigin = -1
      set prevLowPrice = nPrevLowPrice set prevLowOsc = nPrevLowOsc set prevLowBar = nPrevLowBar
      set lastBuyBar = bar_index

    IDLE -> IDLE when buyType == 2 and buyAccept emit BA_BUY_HIDDEN
      set locked = 1 set sawPositiveAfterLock = if(fast > 0, 1, 0)
      set correctionArmed = 0 set depth = 0 set hiddenArmed = 0
      set hiddenArmedBar = -1000 set hiddenOrigin = -1
      set prevLowPrice = nPrevLowPrice set prevLowOsc = nPrevLowOsc set prevLowBar = nPrevLowBar
      set lastBuyBar = bar_index

    IDLE -> IDLE when buyType == 3 and buyAccept emit BA_BUY_COMBINED
      set locked = 1 set sawPositiveAfterLock = if(fast > 0, 1, 0)
      set correctionArmed = 0 set depth = 0 set hiddenArmed = 0
      set hiddenArmedBar = -1000 set hiddenOrigin = -1
      set prevLowPrice = nPrevLowPrice set prevLowOsc = nPrevLowOsc set prevLowBar = nPrevLowBar
      set lastBuyBar = bar_index

    IDLE -> IDLE when buyType > 0 and (buyAccept == 0) reject "filtered"
      set locked = 1 set sawPositiveAfterLock = if(fast > 0, 1, 0)
      set correctionArmed = 0 set depth = 0 set hiddenArmed = 0
      set hiddenArmedBar = -1000 set hiddenOrigin = -1
      set prevLowPrice = nPrevLowPrice set prevLowOsc = nPrevLowOsc set prevLowBar = nPrevLowBar

    IDLE -> IDLE when true
      set locked = lLocked set sawPositiveAfterLock = lSawPos
      set correctionArmed = eCorrArmed set depth = eDepth
      set hiddenArmed = gHiddenArmed set hiddenArmedBar = fHiddenArmedBar set hiddenOrigin = gHiddenOrigin
      set prevLowPrice = nPrevLowPrice set prevLowOsc = nPrevLowOsc set prevLowBar = nPrevLowBar
  }

  machine bear {
    var locked = 0
    var sawNegativeAfterLock = 0
    var correctionArmed = 0
    var depth = 0
    var hiddenArmed = 0
    var hiddenArmedBar = -1000
    var hiddenOrigin = -1
    var prevHighPrice = 0
    var prevHighOsc = 0
    var prevHighBar = -1000
    var lastSellBar = -1000

    let dCorrArmed = if(bearReg == 0, 0, correctionArmed)
    let dDepth = if(bearReg == 0, 0, depth)
    let dHiddenArmed = if(bearReg == 0, 0, hiddenArmed)
    let dHiddenOrigin = if(bearReg == 0, -1, hiddenOrigin)

    let sawNeg = if(locked == 1, if(sawNegativeAfterLock == 1 or fast < 0, 1, 0), sawNegativeAfterLock)
    let unlocks = locked == 1 and sawNeg == 1 and fast >= 0 and bearReg
    let lLocked = if(unlocks, 0, locked)
    let lSawNeg = if(unlocks, 0, sawNeg)
    let cCorrArmed = if(unlocks, 1, dCorrArmed)
    let cDepth = if(unlocks, abs(fast), dDepth)

    let arms = bearReg and fast > 0 and lLocked == 0
    let eCorrArmed = if(arms, 1, cCorrArmed)
    let eDepth = if(arms, max(cDepth, abs(fast)), cDepth)

    let minDepth = 0.05 * max(atrV, 0.01)
    let depthOk = eCorrArmed == 1 and eDepth >= minDepth

    let pivotDist = pivHi.bar - prevHighBar
    let pivotDistOk = prevHighBar > -1000 and pivotDist >= 5 and pivotDist <= 100
    let hiddenConfirmed = pivHi.confirmed and bearReg and lLocked == 0 and depthOk and pivotDistOk
      and prevHighBar > -1000 and pivHi.price < prevHighPrice and oscAtPivot > prevHighOsc
    let nPrevHighPrice = if(pivHi.confirmed, pivHi.price, prevHighPrice)
    let nPrevHighOsc = if(pivHi.confirmed, oscAtPivot, prevHighOsc)
    let nPrevHighBar = if(pivHi.confirmed, pivHi.bar, prevHighBar)

    let fHiddenArmed = if(hiddenConfirmed, 1, dHiddenArmed)
    let fHiddenArmedBar = if(hiddenConfirmed, bar_index, hiddenArmedBar)
    let fHiddenOrigin = if(hiddenConfirmed, pivHi.bar, dHiddenOrigin)
    let expires = fHiddenArmed == 1 and (bearReg == 0 or bar_index - fHiddenArmedBar > 20)
    let gHiddenArmed = if(expires, 0, fHiddenArmed)
    let gHiddenOrigin = if(expires, -1, fHiddenOrigin)

    let sellRel = bearReg and lLocked == 0 and depthOk and crossunder(fast, fastSig) and fast > 0
    let sellHid = gHiddenArmed == 1 and bearReg and lLocked == 0 and crossunder(fast, fastSig)
    let sellType = if(sellRel and sellHid, 3, if(sellHid, 2, if(sellRel, 1, 0)))
    let sellBarsOk = bar_index - lastSellBar >= 20
    let sellFilters = bearReg and emaSellOk and rangeOk
    let sellAccept = sellType > 0 and sellFilters and sellBarsOk

    IDLE -> IDLE when sellType == 1 and sellAccept emit BA_SELL_RELEASE
      set locked = 1 set sawNegativeAfterLock = if(fast < 0, 1, 0)
      set correctionArmed = 0 set depth = 0 set hiddenArmed = 0
      set hiddenArmedBar = -1000 set hiddenOrigin = -1
      set prevHighPrice = nPrevHighPrice set prevHighOsc = nPrevHighOsc set prevHighBar = nPrevHighBar
      set lastSellBar = bar_index

    IDLE -> IDLE when sellType == 2 and sellAccept emit BA_SELL_HIDDEN
      set locked = 1 set sawNegativeAfterLock = if(fast < 0, 1, 0)
      set correctionArmed = 0 set depth = 0 set hiddenArmed = 0
      set hiddenArmedBar = -1000 set hiddenOrigin = -1
      set prevHighPrice = nPrevHighPrice set prevHighOsc = nPrevHighOsc set prevHighBar = nPrevHighBar
      set lastSellBar = bar_index

    IDLE -> IDLE when sellType == 3 and sellAccept emit BA_SELL_COMBINED
      set locked = 1 set sawNegativeAfterLock = if(fast < 0, 1, 0)
      set correctionArmed = 0 set depth = 0 set hiddenArmed = 0
      set hiddenArmedBar = -1000 set hiddenOrigin = -1
      set prevHighPrice = nPrevHighPrice set prevHighOsc = nPrevHighOsc set prevHighBar = nPrevHighBar
      set lastSellBar = bar_index

    IDLE -> IDLE when sellType > 0 and (sellAccept == 0) reject "filtered"
      set locked = 1 set sawNegativeAfterLock = if(fast < 0, 1, 0)
      set correctionArmed = 0 set depth = 0 set hiddenArmed = 0
      set hiddenArmedBar = -1000 set hiddenOrigin = -1
      set prevHighPrice = nPrevHighPrice set prevHighOsc = nPrevHighOsc set prevHighBar = nPrevHighBar

    IDLE -> IDLE when true
      set locked = lLocked set sawNegativeAfterLock = lSawNeg
      set correctionArmed = eCorrArmed set depth = eDepth
      set hiddenArmed = gHiddenArmed set hiddenArmedBar = fHiddenArmedBar set hiddenOrigin = gHiddenOrigin
      set prevHighPrice = nPrevHighPrice set prevHighOsc = nPrevHighOsc set prevHighBar = nPrevHighBar
  }

  plot fast, fastSig on price
  plot slow as histogram in "slow" guide 0
  plot adxV as line in "adx" guide 20
  mark BA_BUY_RELEASE arrow_up below_bar color bull
  mark BA_BUY_HIDDEN arrow_up below_bar color bull
  mark BA_BUY_COMBINED arrow_up below_bar color bull
  mark BA_SELL_RELEASE arrow_down above_bar color bear
  mark BA_SELL_HIDDEN arrow_down above_bar color bear
  mark BA_SELL_COMBINED arrow_down above_bar color bear
}