Dynamic Support Line

// This source code is subject to the terms of the Mozilla Public License 2.0 at https://mozilla.org/MPL/2.0/
// © claygrace74

//@version=6
indicator("Dynamic Support Line", shorttitle="DSL", overlay=true)
import TradingView/ta/8

// ==================== Settings ====================
var ma_group = "Moving Average Settings"
src       = input.source(ohlc4, "Source", group=ma_group)
maLen     = input.int(5, "MA Length", minval=1, group=ma_group)
stdLen    = input.int(14, "StdDev Length", minval=1, group=ma_group)
stdMult   = input.float(1.786, "Band Multiplier", minval=0.1, step=0.1, group=ma_group)

var disp_group = "Display Settings"
i_showFill    = input.bool(true, "Show Band Fill", group=disp_group)
i_showSignals = input.bool(true, "Show Bounce/Break Signals", group=disp_group)
midColor      = input.color(color.white, "Mid Line Color", group=disp_group)
bandColor     = input.color(color.rgb(25, 0, 253), "Band Color", group=disp_group)

// ==================================================================================
// Core Calculations — composite MA from 6 types
// ==================================================================================
sma_top  = ta.sma(src, maLen)
ema_top  = ta.ema(src, maLen)
rma_top  = ta.rma(src, maLen)
hma_top  = ta.hma(src, maLen)
tema_top = ta.tema(src, maLen)
swma_top = ta.swma(src)

ma_mid    = ta.sma((ema_top + sma_top + rma_top + hma_top + tema_top + swma_top) / 6, maLen)
deviation = ta.stdev(src, stdLen) * stdMult
ma_top    = ma_mid + deviation
ma_bottom = ma_mid - deviation

// ==================================================================================
// Signals
// ==================================================================================

// Price relationship to bands
aboveMid = close > ma_mid
belowMid = close < ma_mid

// Bounce signals — price touches band and reverses
bullBounce = low <= ma_bottom and close > ma_bottom and close > open
bearBounce = high >= ma_top and close < ma_top and close < open

// Break signals — price closes beyond band
bullBreak = close > ma_top and close[1] <= ma_top[1]
bearBreak = close < ma_bottom and close[1] >= ma_bottom[1]

// ==================================================================================
// Plots
// ==================================================================================
pTop = plot(ma_top, "Upper Band", color=bandColor, linewidth=1)
pMid = plot(ma_mid, "Mid Line", color=midColor, linewidth=2)
pBot = plot(ma_bottom, "Lower Band", color=bandColor, linewidth=1)

// Dynamic fill — green when price above mid, red when below
fillColor = i_showFill ? (aboveMid ? color.new(color.green, 88) : color.new(color.red, 88)) : color(na)
fill(pTop, pMid, color=fillColor, title="Upper Fill")
fill(pMid, pBot, color=fillColor, title="Lower Fill")

// Bounce/break signals
plotshape(i_showSignals and bullBounce, style=shape.triangleup,   location=location.belowbar, color=color.green,  text="Bounce", textcolor=color.green, size=size.tiny, title="Bull Bounce")
plotshape(i_showSignals and bearBounce, style=shape.triangledown, location=location.abovebar, color=color.red,    text="Bounce", textcolor=color.red,   size=size.tiny, title="Bear Bounce")
plotshape(i_showSignals and bullBreak,  style=shape.triangleup,   location=location.belowbar, color=color.lime,   text="Break",  textcolor=color.lime,  size=size.small, title="Bull Break")
plotshape(i_showSignals and bearBreak,  style=shape.triangledown, location=location.abovebar, color=color.orange,  text="Break",  textcolor=color.orange, size=size.small, title="Bear Break")

// ==================================================================================
// Alert Conditions
// ==================================================================================
alertcondition(bullBounce, "Bullish Bounce",     "Price bounced off lower dynamic support band")
alertcondition(bearBounce, "Bearish Bounce",     "Price bounced off upper dynamic resistance band")
alertcondition(bullBreak,  "Bullish Breakout",   "Price closed above upper dynamic band")
alertcondition(bearBreak,  "Bearish Breakdown",  "Price closed below lower dynamic band")
alertcondition(ta.crossover(close, ma_mid),  "Cross Above Mid", "Price crossed above dynamic mid line")
alertcondition(ta.crossunder(close, ma_mid), "Cross Below Mid", "Price crossed below dynamic mid line")