//@version=5
strategy("PB Blake 2026 Updated Trading Strategy", overlay=true, initial_capital=10000, default_qty_type=strategy.percent_of_equity, default_qty_value=10)

// ==========================================
// 1. INPUTS & CONFIGURATION
// ==========================================
use_htf = input.bool(true, "Use HTF Trend Filter", group="Trend Bias")
htf_timeframe = input.timeframe("15", "HTF Timeframe", group="Trend Bias")
swing_lookback = input.int(10, "Swing Lookback (SL Definition)", minval=3, group="Risk Management")
rr_ratio = input.float(1.5, "Risk-to-Reward Ratio", minval=0.5, group="Risk Management")

// ==========================================
// 2. HIGHER TIMEFRAME BIAS (Step 1)
// ==========================================
htf_ema = request.security(syminfo.tickerid, htf_timeframe, ta.ema(close, 200), barmerge.gaps_off, barmerge.lookahead_off)
htf_close = request.security(syminfo.tickerid, htf_timeframe, close, barmerge.gaps_off, barmerge.lookahead_off)

bullish_bias = not use_htf or (htf_close > htf_ema)
bearish_bias = not use_htf or (htf_close < htf_ema)

// ==========================================
// 3. KEY LEVELS & FVG DETECTOR (Step 2)
// ==========================================
// A Fair Value Gap on execution TF consists of 3 candles.
// Bullish FVG: Low of bar 0 is greater than High of bar 2
bull_fvg = low[0] > high[2]
// Bearish FVG: High of bar 0 is less than Low of bar 2
bear_fvg = high[0] < low[2]

// Track active FVGs for Inversion
var float last_bull_fvg_bottom = na
var bool bull_fvg_active = false

var float last_bear_fvg_top = na
var bool bear_fvg_active = false

if bull_fvg
    last_bull_fvg_bottom := high[2]
    bull_fvg_active := true

if bear_fvg
    last_bear_fvg_top := low[2]
    bear_fvg_active := true

// ==========================================
// 4. INVERSION FVG (IFVG) DETECTOR (Step 3)
// ==========================================
// Bullish Inversion: Price closes above the top of an active Bearish FVG
bear_fvg_inverted = bear_fvg_active and ta.crossover(close, last_bear_fvg_top)

// Bearish Inversion: Price closes below the bottom of an active Bullish FVG
bull_fvg_inverted = bull_fvg_active and ta.crossunder(close, last_bull_fvg_bottom)

// Reset state once inverted to prevent duplicate entries
if bear_fvg_inverted
    bear_fvg_active := false

if bull_fvg_inverted
    bull_fvg_active := false

// ==========================================
// 5. TRADE EXECUTION & RISK MANAGEMENT (Step 4)
// ==========================================
long_condition = bear_fvg_inverted and bullish_bias
short_condition = bull_fvg_inverted and bearish_bias

if long_condition and strategy.position_size == 0
    swing_low = ta.lowest(low, swing_lookback)
    sl_distance = close - swing_low
    sl = swing_low
    tp = close + (sl_distance * rr_ratio)
    strategy.entry("Long IFVG", strategy.long)
    strategy.exit("Long Exit", "Long IFVG", stop=sl, limit=tp)

if short_condition and strategy.position_size == 0
    swing_high = ta.highest(high, swing_lookback)
    sl_distance = swing_high - close
    sl = swing_high
    tp = close - (sl_distance * rr_ratio)
    strategy.entry("Short IFVG", strategy.short)
    strategy.exit("Short Exit", "Short IFVG", stop=sl, limit=tp)

// ==========================================
// VISUALIZATIONS
// ==========================================
plotshape(long_condition, title="Bullish Entry (Bear FVG Inverted)", style=shape.triangleup, location=location.belowbar, color=color.green, size=size.small)
plotshape(short_condition, title="Bearish Entry (Bull FVG Inverted)", style=shape.triangledown, location=location.abovebar, color=color.red, size=size.small)

// Draw active FVG Levels
plot(bull_fvg_active ? last_bull_fvg_bottom : na, "Active Bull FVG Inversion Level", color=color.new(color.green, 50), style=plot.style_line)
plot(bear_fvg_active ? last_bear_fvg_top : na, "Active Bear FVG Inversion Level", color=color.new(color.red, 50), style=plot.style_line)