Tweezer Bottom - Bullish

//@version=5
indicator("Tweezer Bottom - Bullish", shorttitle = "Tweezer Bottom - Bull", 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_bullish = input(color.blue, "Label Color Bullish")
C_TweezerBottomBullishNumberOfCandles = 2
C_TweezerBottomBullish = false
if C_UpTrend[1] and (not C_IsDojiBody or (C_HasUpShadow and C_HasDnShadow)) and math.abs(low-low[1]) <= C_BodyAvg*0.05 and C_BlackBody[1] and C_WhiteBody and C_LongBody[1]
    C_TweezerBottomBullish := true
alertcondition(C_TweezerBottomBullish, title = "New pattern detected", message = "New Tweezer Bottom – Bullish pattern detected")
if C_TweezerBottomBullish
    var ttBullishTweezerBottom = "Tweezer Bottom\nTweezer Bottom is a two-candle pattern that signifies a potential bullish reversal. The pattern is found during a downtrend. The first candle is long and red, the second candle is green, its lows nearly identical to the low of the previous candle. The virtually identical lows together with the inverted directions hint that bulls might be taking over the market."
    label.new(bar_index, patternLabelPosLow, text="TB", style=label.style_label_up, color = label_color_bullish, textcolor=color.white, tooltip = ttBullishTweezerBottom)
bgcolor(ta.highest(C_TweezerBottomBullish?1:0, C_TweezerBottomBullishNumberOfCandles)!=0 ? color.new(color.blue, 90) : na, offset=-(C_TweezerBottomBullishNumberOfCandles-1))