WMA 20 50 Proximity Crossover

//@version=6
// WMA 20 50 Proximity Crossover — sort.finance. Fills at the signal bar's close, 0.02% fee a side,
// whole account per trade, as the backtest. History and indicator warm-up
// differ from the site's, so expect close to the same trades, not identical.
strategy("WMA 20 50 Proximity Crossover", overlay=true,
     initial_capital=100, default_qty_type=strategy.percent_of_equity,
     default_qty_value=100, commission_type=strategy.commission.percent,
     commission_value=0.02, process_orders_on_close=true, pyramiding=0)

// The bar the current position opened on, and the bar the last one closed on.
var int entryBar = na
var int exitBar = -1

// ── Signals ──────────────────────────────────────────────────────────────
fast = ta.wma(close, 20)
slow = ta.wma(close, 50)
gap = (fast - slow) / slow
// In when the gap rises into the 0.5% band around zero, out when it
// falls into it from above; the side holds until the next of those.
risingIn = gap[1] <= -0.005 and gap > -0.005
fallingIn = gap[1] >= 0.005 and gap < 0.005
var float held = 0.0
if risingIn
    held := 1
if fallingIn
    held := -1
inBand = held > 0
enterNow = inBand and not inBand[1]
exitNow = not inBand and inBand[1]

// ── Orders ───────────────────────────────────────────────────────────────
// Open on the first bar the entry holds while flat; close on the first
// later bar the exit holds; never reopen on the bar a position closed.
inTrade = strategy.position_size != 0
if inTrade and bar_index > entryBar and exitNow
    strategy.close("Long")
    exitBar := bar_index
else if not inTrade and bar_index > exitBar and enterNow
    strategy.entry("Long", strategy.long)
    entryBar := bar_index

// ── Drawing ──────────────────────────────────────────────────────────────
plot(fast, "WMA 20", color=#4d8dff)
plot(slow, "WMA 50", color=#e0a03a)