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/*backtest
start: 2024-02-20 00:00:00
end: 2025-02-17 08:00:00
period: 2h
basePeriod: 2h
exchanges: [{"eid":"Futures_Binance","currency":"BTC_USDT"}]
*/

//@version=5
strategy("Delta SMA 1-Year High/Low Strategy", overlay = false, margin_long = 100, margin_short = 100)

// Inputs
delta_sma_length = input.int(14, title="Delta SMA Length", minval=1)  // SMA length for Delta
lookback_days = 365  // Lookback period fixed to 1 year

// Function to calculate buy and sell volume
buy_volume = close > open ? volume : na
sell_volume = close < open ? volume : na

// Calculate the Delta
delta = nz(buy_volume, 0) - nz(sell_volume, 0)

// Calculate Delta SMA
delta_sma = ta.sma(delta, delta_sma_length)

// Lookback period in bars (1 bar = 1 day)
desired_lookback_bars = lookback_days

// Ensure lookback doesn't exceed available historical data
max_lookback_bars = math.min(desired_lookback_bars, 365)  // Cap at 365 bars (1 year)

// Calculate Delta SMA low and high within the valid lookback period
delta_sma_low_1yr = ta.lowest(delta_sma, max_lookback_bars)
delta_sma_high_1yr = ta.highest(delta_sma, max_lookback_bars)

// Define thresholds for buy and sell conditions
very_low_threshold = delta_sma_low_1yr * 0.7
above_70_threshold = delta_sma_high_1yr * 0.9
below_60_threshold = delta_sma_high_1yr * 0.5

// Track if `delta_sma` was very low and persist the state
var bool was_very_low = false
if delta_sma < very_low_threshold
    was_very_low := true
if ta.crossover(delta_sma, 10000)
    was_very_low := false  // Reset after crossing 0

// Track if `delta_sma` crossed above 70% of the high
var bool crossed_above_70 = false
if ta.crossover(delta_sma, above_70_threshold)
    crossed_above_70 := true
if delta_sma < below_60_threshold*0.5 and crossed_above_70
    crossed_above_70 := false  // Reset after triggering sell

// Buy condition: `delta_sma` was very low and now crosses 0
buy_condition = was_very_low and ta.crossover(delta_sma, 0)

// Sell condition: `delta_sma` crossed above 70% of the high and now drops below 60%
sell_condition = crossed_above_70 and delta_sma < below_60_threshold

// Place a long order when buy condition is met
if buy_condition
    strategy.entry("Buy", strategy.long)

// Place a short order when sell condition is met
if sell_condition
    strategy.close("Buy")

// Plot Delta SMA and thresholds for visualization
plot(delta_sma, color=color.blue, title="Delta SMA")
plot(very_low_threshold, color=color.green, title="70% of 1-Year Delta SMA Low", linewidth=2)
plot(above_70_threshold, color=color.purple, title="70% of 1-Year Delta SMA High", linewidth=2)
plot(below_60_threshold, color=color.red, title="60% of 1-Year Delta SMA High", linewidth=2)

// Optional: Plot Buy and Sell signals on the chart
//plotshape(series=buy_condition, title="Buy Signal", location=location.belowbar, color=color.new(color.green, 0), style=shape.labelup, text="BUY")
//plotshape(series=sell_condition, title="Sell Signal", location=location.abovebar, color=color.new(color.red, 0), style=shape.labeldown, text="SELL")