//@version=5
strategy("Lewis Kelly SMC Strategy", overlay=true, initial_capital=10000, default_qty_type=strategy.percent_of_equity, default_qty_value=10)

// --- INPUTS ---
i_length = input.int(5, title="Swing Lookback Length", group="Structure Settings")
i_rr     = input.float(3.0, title="Risk-to-Reward Ratio", group="Risk Management")

// --- SWING STRUCTURE MAPPING ---
// Using pivot highs and lows to track external swing structure
float p_high = ta.pivothigh(high, i_length, i_length)
float p_low  = ta.pivotlow(low, i_length, i_length)

var float swing_high = na
var float swing_low  = na
var bool  is_bullish = true

if (not na(p_high))
    swing_high := p_high

if (not na(p_low))
    swing_low := p_low

// Trend State Switch (Change of Character / BOS tracking)
if (not na(swing_high) and close > swing_high)
    is_bullish := true
else if (not na(swing_low) and close < swing_low)
    is_bullish := false

// Plot Key Levels
plot(swing_high, title="Swing High", color=color.red, style=plot.style_linebr)
plot(swing_low, title="Swing Low", color=color.green, style=plot.style_linebr)

// --- ENTRY EXECUTION ---
bool can_trade = strategy.position_size == 0

// Long Entry when swing structure is bullish and price pulls back to swing low
if (can_trade and is_bullish and not na(swing_low))
    float entry_price = close
    float stop_loss   = swing_low - (ta.atr(14) * 0.1) // Small buffer below swing low
    float risk        = entry_price - stop_loss
    float target      = entry_price + (risk * i_rr)
    
    if (risk > 0)
        strategy.entry("SMC Long", strategy.long)
        strategy.exit("Exit Long", "SMC Long", stop=stop_loss, limit=target)

// Short Entry when swing structure is bearish and price reaches supply/swing high
if (can_trade and not is_bullish and not na(swing_high))
    float entry_price = close
    float stop_loss   = swing_high + (ta.atr(14) * 0.1) // Small buffer above swing high
    float risk        = stop_loss - entry_price
    float target      = entry_price - (risk * i_rr)
    
    if (risk > 0)
        strategy.entry("SMC Short", strategy.short)
        strategy.exit("Exit Short", "SMC Short", stop=stop_loss, limit=target)