//@version=5
strategy("Previous Day High/Low Scalping Strategy", overlay=true, initial_capital=100000, default_qty_type=strategy.percent_of_equity, default_qty_value=10)

// --- Inputs ---
timezoneInput = input.string("Asia/Kolkata", title="Market Timezone")
sessionInput  = input.string("0915-1145", title="Allowed Trade Window (2.5 Hours)")
showLevels    = input.bool(true, title="Show PDH/PDL Lines")

// --- Calculations ---
// Fetch Daily High/Low of previous day
pdh = request.security(syminfo.tickerid, "D", high[1], lookahead=barmerge.lookahead_off)
pdl = request.security(syminfo.tickerid, "D", low[1], lookahead=barmerge.lookahead_off)

// Session check
inSession = not na(time(timeframe.period, sessionInput + ":23456", timezoneInput))

// 15-minute Breakout tracking
breakout15mUp   = request.security(syminfo.tickerid, "15", close[1] > pdh[1], lookahead=barmerge.lookahead_off)
breakout15mDown = request.security(syminfo.tickerid, "15", close[1] < pdl[1], lookahead=barmerge.lookahead_off)

// Candlestick Pattern Detections (to run on 5m timeframe)
bodySize     = math.abs(close - open)
candleRange  = high - low
lowerShadow  = math.min(open, close) - low
upperShadow  = high - math.max(open, close)

isHammer       = (candleRange > 0) and (lowerShadow > candleRange * 0.6) and (upperShadow < candleRange * 0.15)
isShootingStar = (candleRange > 0) and (upperShadow > candleRange * 0.6) and (lowerShadow < candleRange * 0.15)

isBullishEngulfing = (close[1] < open[1]) and (close > open) and (close >= open[1]) and (open <= close[1])
isBearishEngulfing = (close[1] > open[1]) and (close < open) and (close <= open[1]) and (open >= close[1])

// Pullback / Retest check on 5m chart
pullbackToPDH = (low <= pdh) and (close >= pdh * 0.995)
pullbackToPDL = (high >= pdl) and (close <= pdl * 1.005)

// --- Execution State Management ---
var float entrySL  = na
var float entryTP1 = na
var float entryTP2 = na
var bool tp1Hit    = false

if (strategy.position_size == 0)
    tp1Hit   := false
    entrySL  := na
    entryTP1 := na
    entryTP2 := na

// --- Entry Rules ---
longCondition  = inSession and breakout15mUp and pullbackToPDH and (isHammer or isBullishEngulfing)
shortCondition = inSession and breakout15mDown and pullbackToPDL and (isShootingStar or isBearishEngulfing)

if (longCondition and strategy.position_size == 0)
    risk = close - low
    if risk > 0
        entrySL  := low
        entryTP1 := close + risk * 2
        entryTP2 := close + risk * 3
        strategy.entry("Long", strategy.long)

if (shortCondition and strategy.position_size == 0)
    risk = high - close
    if risk > 0
        entrySL  := high
        entryTP1 := close - risk * 2
        entryTP2 := close - risk * 3
        strategy.entry("Short", strategy.short)

// --- Active Trade Management (Trailing & Take Profits) ---
if (strategy.position_size > 0)
    if not tp1Hit and high >= entryTP1
        tp1Hit := true
        entrySL := strategy.position_avg_price // Move Stop Loss to Entry (Breakeven)
    
    if tp1Hit
        strategy.exit("TP2/SL_Trail", "Long", qty_percent=100, limit=entryTP2, stop=entrySL)
    else
        strategy.exit("TP1", "Long", qty_percent=50, limit=entryTP1, stop=entrySL)
        strategy.exit("TP2", "Long", qty_percent=50, limit=entryTP2, stop=entrySL)

if (strategy.position_size < 0)
    if not tp1Hit and low <= entryTP1
        tp1Hit := true
        entrySL := strategy.position_avg_price // Move Stop Loss to Entry (Breakeven)
        
    if tp1Hit
        strategy.exit("TP2/SL_Trail", "Short", qty_percent=100, limit=entryTP2, stop=entrySL)
    else
        strategy.exit("TP1", "Short", qty_percent=50, limit=entryTP1, stop=entrySL)
        strategy.exit("TP2", "Short", qty_percent=50, limit=entryTP2, stop=entrySL)

// --- Plotting ---
plot(showLevels ? pdh : na, color=color.green, linewidth=2, title="Previous Day High")
plot(showLevels ? pdl : na, color=color.red, linewidth=2, title="Previous Day Low")