Tactical DCA with Cash Top-up (Date Filter)

// This Pine Script™ code is subject to the terms of the Mozilla Public License 2.0 at https://mozilla.org/MPL/2.0/
// © ExpertPineQuant

//@version=6
strategy("[CUCEDT-W34] Tactical DCA with Cash Top-up (Date Filter)", overlay = true, pyramiding = 1000, initial_capital = 1000, default_qty_type = strategy.cash, currency = currency.USD, margin_long = 0)

//------------------------------------------------------------------------------
// TABLE OF CONTENTS 
// 1. Inputs
// 2. Calculations
// 3. Strategy Logic
// 4. Visuals
//-----------------------------------------------------------------------------{

//------------------------------------------------------------------------------
// 1. Inputs
//-----------------------------------------------------------------------------{
// --- DCA Settings ---
grp_strat = "DCA Settings"
cashTopUpInput = input.float(1.0, "Cash Top-up Amount (Per Bar)", minval = 1.0, group = grp_strat)
smaLengthInput = input.int(100, "SMA Filter Length", minval = 1, group = grp_strat)

// --- Backtest Range ---
grp_backtest   = "Backtest Range"
useDateFilter  = input.bool(true, "Filter Date Range", group = grp_backtest)
startDateInput = input.time(timestamp("1 Jan 2025"), "Start Date", group = grp_backtest)
endDateInput   = input.time(timestamp("18 Jan 2026"), "End Date", group = grp_backtest)

// Function to check date range
isDateInRange() =>
    not useDateFilter or (time >= startDateInput and time <= endDateInput)

//-----------------------------------------------------------------------------}
// 2. Calculations
//-----------------------------------------------------------------------------{
float smaValue = ta.sma(close, smaLengthInput)
bool isBullishCrossover = ta.crossover(close, smaValue)

//-----------------------------------------------------------------------------}
// 3. Strategy Logic
//-----------------------------------------------------------------------------{
// Variable to track accumulated cash (Savings Account)
var float accumulatedCash = 0.0

// --- 1. Accumulation Phase ---
// Only accumulate cash if we are within the Start Date and End Date
if isDateInRange()
    accumulatedCash := accumulatedCash + cashTopUpInput

// --- 2. Deployment Phase ---
// Condition: Bullish Crossover AND We have cash AND We are in date range
if isBullishCrossover and accumulatedCash > 0 and isDateInRange()
    // Calculate quantity based on current price
    float qtyToBuy = accumulatedCash / close
    
    // Execute Buy Order using strategy.order
    strategy.order("DCA Buy", strategy.long, qty = qtyToBuy, comment = "Deployed: $" + str.tostring(accumulatedCash, "#.##"))
    
    // Reset cash pile after spending
    accumulatedCash := 0.0

// --- 3. Force Close Phase ---
// If the current time exceeds the end date, close all positions
if time > endDateInput
    strategy.close_all(comment = "End Date Reached")
    // Reset cash to 0
    accumulatedCash := 0.0

//-----------------------------------------------------------------------------}
// 4. Visuals
//-----------------------------------------------------------------------------{
plot(smaValue, "Trend SMA", color = color.new(color.orange, 0), linewidth = 2)

plotshape(isBullishCrossover and isDateInRange(), title = "Buy Signal", style = shape.triangleup, location = location.belowbar, color = color.teal, size = size.small)

// Display accumulated cash in Data Window
plot(accumulatedCash, "Accumulated Cash Pile", color = color.green, display = display.data_window)

// Show pending cash on the last bar (only if within range)
if barstate.islast and isDateInRange()
    label.new(bar_index, high, "Pending Cash:\n$" + str.tostring(accumulatedCash, "#.##"), 
         style = label.style_label_down, color = color.green, textcolor = color.white)

//-----------------------------------------------------------------------------}