MA Crossover (Guide Example)

//@version=6
// ==============================================================
//  MA Crossover Strategy — ตัวอย่าง Pine Script (TradingView)
//  Logic เดียวกับ examples/mql5/MA_Crossover_EA.mq5
//  ใช้เพื่อ: ทดสอบไอเดียเร็วๆ บน TradingView ก่อนแปลงไป MQL5
//  ⚠️ เพื่อการศึกษาเท่านั้น
// ==============================================================
strategy("MA Crossover (Guide Example)",
     overlay = true,
     initial_capital = 10000,
     default_qty_type = strategy.percent_of_equity,
     default_qty_value = 10,
     commission_type = strategy.commission.percent,
     commission_value = 0.01)

// --- Inputs
fastLen  = input.int(10,  "Fast EMA")
slowLen  = input.int(50,  "Slow EMA")
slPct    = input.float(1.0, "Stop Loss %",   step = 0.1)
tpPct    = input.float(2.0, "Take Profit %", step = 0.1)

// --- Indicators
fastMA = ta.ema(close, fastLen)
slowMA = ta.ema(close, slowLen)

// --- Entry signals
crossUp   = ta.crossover(fastMA, slowMA)
crossDown = ta.crossunder(fastMA, slowMA)

if crossUp
    strategy.entry("Long", strategy.long)
if crossDown
    strategy.entry("Short", strategy.short)

// --- Exit: SL/TP เป็น % จากราคาเข้า
if strategy.position_size > 0
    strategy.exit("Long Exit", "Long",
         stop  = strategy.position_avg_price * (1 - slPct / 100),
         limit = strategy.position_avg_price * (1 + tpPct / 100))
if strategy.position_size < 0
    strategy.exit("Short Exit", "Short",
         stop  = strategy.position_avg_price * (1 + slPct / 100),
         limit = strategy.position_avg_price * (1 - tpPct / 100))

// --- Plot
plot(fastMA, "Fast EMA", color = color.new(color.aqua, 0))
plot(slowMA, "Slow EMA", color = color.new(color.orange, 0))
plotshape(crossUp,   style = shape.triangleup,   location = location.belowbar, color = color.green, size = size.small)
plotshape(crossDown, style = shape.triangledown, location = location.abovebar, color = color.red,   size = size.small)

// --- Alert (ใช้ส่ง webhook ไป bridge → MT5 ได้)
alertcondition(crossUp,   "MA Cross Up",   "BUY {{ticker}} @ {{close}}")
alertcondition(crossDown, "MA Cross Down", "SELL {{ticker}} @ {{close}}")