//@version=5
strategy("TradingLab 3-Step Strategy [Complete]", overlay=true, initial_capital=10000, default_qty_type=strategy.percent_of_equity, default_qty_value=10, commission_type=strategy.commission.percent, commission_value=0.02)

// --- INPUTS ---
min_rr        = input.float(2.5, title="Minimum Risk-to-Reward Ratio")
lookback      = input.int(5, title="Structure Lookback Period")
stop_buffer   = input.float(0.5, title="Stop Loss Buffer (Ticks)")

// --- MARKET STRUCTURE & TREND ---
// Identifying swing highs and lows
var int trend = 0 // 1 = Uptrend, -1 = Downtrend

float recent_high = ta.highest(high, lookback)
float recent_low  = ta.lowest(low, lookback)

// Simplified trend state tracking via higher highs/higher lows or lower lows/lower highs
bool higher_high = high > ta.highest(high, lookback)[1]
bool higher_low  = low > ta.lowest(low, lookback)[1]
bool lower_low   = low < ta.lowest(low, lookback)[1]
bool lower_high  = high < ta.highest(high, lookback)[1]

if (higher_high and higher_low)
    trend := 1  // Uptrend
else if (lower_low and lower_high)
    trend := -1 // Downtrend

// --- SUPPLY & DEMAND ZONE DETECTION ---
// Demand Zone: Up candle or consolidation before a strong upward impulsive move
// Supply Zone: Down candle or consolidation before a strong downward impulsive move
float body_size = math.abs(close - open)
float avg_body = ta.sma(body_size, 20)
bool is_impulse_up = (close > open) and (body_size > avg_body * 1.5)
bool is_impulse_down = (close < open) and (body_size > avg_body * 1.5)

var float demand_zone_low = na
var float demand_zone_high = na
var float supply_zone_low = na
var float supply_zone_high = na

// Mark Demand Zone (The candle before the bullish impulse)
if is_impulse_up and trend == 1
    demand_zone_low := low[1]
    demand_zone_high := high[1]

// Mark Supply Zone (The candle before the bearish impulse)
if is_impulse_down and trend == -1
    supply_zone_low := low[1]
    supply_zone_high := high[1]

// --- ENTRY & RISK MANAGEMENT EXECUTION ---
// Long Entry: In an uptrend, price retraces into the Demand Zone
bool touch_demand = (low <= demand_zone_high) and (high >= demand_zone_low)
if trend == 1 and touch_demand and strategy.position_size == 0
    float entry_price = close
    float stop_loss   = demand_zone_low - (stop_buffer * syminfo.mintick)
    float risk        = entry_price - stop_loss
    float take_profit = entry_price + (risk * min_rr)
    
    // Ensure RR requirement is met
    if risk > 0
        strategy.entry("Demand Long", strategy.long)
        strategy.exit("Long Exit", "Demand Long", stop=stop_loss, limit=take_profit)

// Short Entry: In a downtrend, price retraces into the Supply Zone
bool touch_supply = (high >= supply_zone_low) and (low <= supply_zone_high)
if trend == -1 and touch_supply and strategy.position_size == 0
    float entry_price = close
    float stop_loss   = supply_zone_high + (stop_buffer * syminfo.mintick)
    float risk        = stop_loss - entry_price
    float take_profit = entry_price - (risk * min_rr)
    
    if risk > 0
        strategy.entry("Supply Short", strategy.short)
        strategy.exit("Short Exit", "Supply Short", stop=stop_loss, limit=take_profit)

// --- PLOTS ---
plot(demand_zone_high, color=color.new(color.green, 50), style=plot.style_linebr, title="Demand Zone High")
plot(demand_zone_low, color=color.new(color.green, 50), style=plot.style_linebr, title="Demand Zone Low")
plot(supply_zone_high, color=color.new(color.red, 50), style=plot.style_linebr, title="Supply Zone High")
plot(supply_zone_low, color=color.new(color.red, 50), style=plot.style_linebr, title="Supply Zone Low")