Tri-Star - Bearish

//@version=5
indicator("Tri-Star - Bearish", shorttitle = "Tri-Star - Bear", overlay=true)

C_DownTrend = true
C_UpTrend = true
var trendRule1 = "SMA50"
var trendRule2 = "SMA50, SMA200"
var trendRule = input.string(trendRule1, "Detect Trend Based On", options=[trendRule1, trendRule2, "No detection"])

if trendRule == trendRule1
    priceAvg = ta.sma(close, 50)
    C_DownTrend := close < priceAvg
    C_UpTrend := close > priceAvg

if trendRule == trendRule2
    sma200 = ta.sma(close, 200)
    sma50 = ta.sma(close, 50)
    C_DownTrend := close < sma50 and sma50 < sma200
    C_UpTrend := close > sma50 and sma50 > sma200
C_Len = 14 // ta.ema depth for bodyAvg
C_ShadowPercent = 5.0 // size of shadows
C_ShadowEqualsPercent = 100.0
C_DojiBodyPercent = 5.0
C_Factor = 2.0 // shows the number of times the shadow dominates the candlestick body

C_BodyHi = math.max(close, open)
C_BodyLo = math.min(close, open)
C_Body = C_BodyHi - C_BodyLo
C_BodyAvg = ta.ema(C_Body, C_Len)
C_SmallBody = C_Body < C_BodyAvg
C_LongBody = C_Body > C_BodyAvg
C_UpShadow = high - C_BodyHi
C_DnShadow = C_BodyLo - low
C_HasUpShadow = C_UpShadow > C_ShadowPercent / 100 * C_Body
C_HasDnShadow = C_DnShadow > C_ShadowPercent / 100 * C_Body
C_WhiteBody = open < close
C_BlackBody = open > close
C_Range = high-low
C_IsInsideBar = C_BodyHi[1] > C_BodyHi and C_BodyLo[1] < C_BodyLo
C_BodyMiddle = C_Body / 2 + C_BodyLo
C_ShadowEquals = C_UpShadow == C_DnShadow or (math.abs(C_UpShadow - C_DnShadow) / C_DnShadow * 100) < C_ShadowEqualsPercent and (math.abs(C_DnShadow - C_UpShadow) / C_UpShadow * 100) < C_ShadowEqualsPercent
C_IsDojiBody = C_Range > 0 and C_Body <= C_Range * C_DojiBodyPercent / 100
C_Doji = C_IsDojiBody and C_ShadowEquals

patternLabelPosLow = low - (ta.atr(30) * 0.6)
patternLabelPosHigh = high + (ta.atr(30) * 0.6)

label_color_bearish = input(color.red, "Label Color Bearish")
C_TriStarBearishNumberOfCandles = 3
C_3Dojis = C_Doji[2] and C_Doji[1] and C_Doji
C_BodyGapUp = C_BodyHi[1] < C_BodyLo
C_BodyGapDn = C_BodyLo[1] > C_BodyHi
C_TriStarBearish = C_3Dojis and C_UpTrend[2] and C_BodyGapUp[1] and C_BodyGapDn
alertcondition(C_TriStarBearish, title = "New pattern detected", message = "New Tri-Star – Bearish pattern detected")
if C_TriStarBearish
    var ttBearishTriStar = "Tri-Star\nThis particular pattern can form when three doji candlesticks appear in immediate succession at the end of an extended uptrend. The first doji candle marks indecision between bull and bear. The second doji gaps in the direction of the leading trend. The third changes the attitude of the market once the candlestick opens in the direction opposite to the trend. Each doji candle has a shadow, all comparatively shallow, which signify an interim cutback in volatility."
    label.new(bar_index, patternLabelPosHigh, text="3S", style=label.style_label_down, color = label_color_bearish, textcolor=color.white, tooltip = ttBearishTriStar)
bgcolor(ta.highest(C_TriStarBearish?1:0, C_TriStarBearishNumberOfCandles)!=0 ? color.new(color.red, 90) : na, offset=-(C_TriStarBearishNumberOfCandles-1))