//@version=5
strategy("Lege - System", overlay=true, initial_capital = 1000)

// Input for adjustable Risk-Reward ratio
// This sets the reward relative to the risk taken on a trade
RR = input.float(2.0, title="Risk:Reward", step=0.1)

// Input for risk percentage of equity per trade
// This allows the user to set how much of their equity they want to risk on a single trade
riskPercentOfEquity = input.float(1, title="Risk per Trade (%)", step=1) / 100

// Function to calculate the position size based on risk and stop loss distance
// The function takes two arguments:
// stop - the stop loss price, and
// riskPercentOfEquity - the percentage of equity to risk per trade
getBetSize(float stop, float riskPercentOfEquity) =>
    onePercentCapital = strategy.equity * riskPercentOfEquity // Calculate the amount of equity to risk
    betSize = onePercentCapital / math.abs(close - stop)      // Divide by the distance to the stop to get position size

// Define the start of the week (Monday 00:00 UTC)
// This sets a condition that is true only when the week starts
var bool is_first_week_candle = false
week_start = (dayofweek == dayofweek.monday and hour == 0)

// Variables to store the high and low of the first 1-hour candle of the week
// These will be used to determine the breakout levels for the week
var float week_open_candle_high = na
var float week_open_candle_low  = na
var bool long_trade_opened      = false  // To track if a long trade has been opened
var bool short_trade_opened     = false  // To track if a short trade has been opened

// Counters to limit trades to one long and one short per week
var int long_trade_count  = 0  // Tracks number of long trades this week
var int short_trade_count = 0  // Tracks number of short trades this week

// If it's the first candle of the week, store its high and low values
if (week_start)
    week_open_candle_high := high         // Set the high of the first hour candle
    week_open_candle_low  := low          // Set the low of the first hour candle
    is_first_week_candle := true          // Mark that the first candle has been processed
    long_trade_opened := false            // Reset long trade flag
    short_trade_opened := false           // Reset short trade flag
    long_trade_count := 0                 // Reset long trade counter
    short_trade_count := 0                // Reset short trade counter

// Trade signals based on breakout of the first week's candle
// This checks if the price breaks above or below the high or low of the first candle

if (is_first_week_candle)
    // Long trade condition: Price breaks above the high of the first candle
    // and no long trade has been opened this week
    if (close > week_open_candle_high and not long_trade_opened and long_trade_count < 1)
        stop_loss_long     = week_open_candle_low  // Set stop loss at the low of the first candle
        take_profit_long   = close + RR * (close - week_open_candle_low)  // Set take profit using the RR ratio
        bet_size_long = getBetSize(stop_loss_long, riskPercentOfEquity)   // Calculate the position size based on risk
        long_trade_opened := true             // Mark that a long trade has been opened
        long_trade_count += 1                 // Increment the long trade counter for the week
        strategy.entry("Long", strategy.long, bet_size_long)  // Enter the long trade

        strategy.exit("Long exit", "Long", limit=take_profit_long, stop=stop_loss_long)  // Set take profit and stop loss for the trade

    // Short trade condition: Price breaks below the low of the first candle
    // and no short trade has been opened this week
    if (close < week_open_candle_low and not short_trade_opened and short_trade_count < 1)
        stop_loss_short     = week_open_candle_high  // Set stop loss at the high of the first candle
        take_profit_short   = close - RR * (week_open_candle_high - close)  // Set take profit using the RR ratio
        bet_size_short = getBetSize(stop_loss_short, riskPercentOfEquity)   // Calculate the position size based on risk
        short_trade_opened := true             // Mark that a short trade has been opened
        short_trade_count += 1                 // Increment the short trade counter for the week
        strategy.entry("Short", strategy.short, bet_size_short)  // Enter the short trade

        strategy.exit("Short exit", "Short", limit=take_profit_short, stop=stop_loss_short)  // Set take profit and stop loss for the trade

// Close all open trades at the end of the week (Friday 23:59 UTC)
// This ensures that no positions are carried over into the next week
if (dayofweek == dayofweek.friday and hour == 23 and minute == 59)
    strategy.close("Long")
    strategy.close("Short")
    is_first_week_candle := false  // Reset the flag to allow a new week's trades