VSA Volume Spread Analysis

//@version=5
indicator("VSA Volume Spread Analysis [Advanced]", overlay=true, max_bars_back=500)

// === INPUTS ===
length = input.int(20, "Volume SMA Length")
volMultiplierHigh = input.float(1.5, "High Volume Multiplier", step=0.1)
volMultiplierLow  = input.float(0.5, "Low Volume Multiplier", step=0.1)

// === CALCULATIONS ===
volSMA = ta.sma(volume, length)
volHigh = volume > volSMA * volMultiplierHigh
volLow = volume < volSMA * volMultiplierLow

spread = high - low
body = math.abs(close - open)
clv = close == high and close == low ? 0 : (2 * close - high - low) / (high - low)  // Close Location Value

// === LOGIC ===

// Upthrust: Wide spread up, closes low, high volume
upthrust = volHigh and close < open and close <= low + spread * 0.3 and spread > ta.sma(spread, length)
plotshape(upthrust, style=shape.labeldown, location=location.abovebar, color=color.red, text="Upthrust", textcolor=color.white)

// No Demand: Small spread up bar, low volume, closes in upper third
noDemand = volLow and close > open and close >= high - spread * 0.3 and spread < ta.sma(spread, length)
plotshape(noDemand, style=shape.triangledown, location=location.abovebar, color=color.orange, text="No Demand", textcolor=color.white)

// Stopping Volume: Down bar on ultra-high volume, closes off low
stoppingVolume = close < open and volHigh and close > low + spread * 0.3
plotshape(stoppingVolume, style=shape.labelup, location=location.belowbar, color=color.green, text="Stopping Vol", textcolor=color.white)

// Test Bar: Down bar on low volume, closes in top 1/3
testBar = close < open and volLow and close >= high - spread * 0.3
plotshape(testBar, style=shape.triangleup, location=location.belowbar, color=color.lime, text="Test", textcolor=color.black)

// Buying Climax: Very high volume, wide spread up, but close off highs
buyingClimax = close > open and volHigh and close < high - spread * 0.3 and spread > ta.sma(spread, length)
plotshape(buyingClimax, style=shape.xcross, location=location.abovebar, color=color.fuchsia, text="BC", textcolor=color.white)

// No Supply: Small down bar on low volume, closes in bottom third
noSupply = volLow and close < open and close <= low + spread * 0.3 and spread < ta.sma(spread, length)
plotshape(noSupply, style=shape.triangleup, location=location.belowbar, color=color.blue, text="No Supply", textcolor=color.white)

// Effort to Rise: Wide spread up on high volume, closes high
effortToRise = close > open and volHigh and close >= high - spread * 0.2 and spread > ta.sma(spread, length)
plotshape(effortToRise, style=shape.circle, location=location.belowbar, color=color.teal, text="ETR", textcolor=color.white)

// Effort to Fall: Wide spread down on high volume, closes low
effortToFall = close < open and volHigh and close <= low + spread * 0.2 and spread > ta.sma(spread, length)
plotshape(effortToFall, style=shape.circle, location=location.abovebar, color=color.maroon, text="ETF", textcolor=color.white)

// Trap Up Move: Breakout above recent high but closes weak on high volume
trapUp = high > ta.highest(high[1], 10) and close < high - spread * 0.3 and volHigh
plotshape(trapUp, style=shape.labeldown, location=location.abovebar, color=color.red, text="Trap Up", textcolor=color.white)

// Trap Down Move: Break below recent low but closes strong on high volume
trapDown = low < ta.lowest(low[1], 10) and close > low + spread * 0.3 and volHigh
plotshape(trapDown, style=shape.labelup, location=location.belowbar, color=color.green, text="Trap Down", textcolor=color.white)

// === COLORING BARS ===
barcolor( upthrust         ? color.red :stoppingVolume   ? color.green : testBar          ? color.lime : noDemand         ? color.orange : noSupply         ? color.blue : buyingClimax     ? color.fuchsia :effortToRise     ? color.teal : effortToFall     ? color.maroon :trapUp           ? color.red :trapDown         ? color.green : na)

// === Optional Alerts ===
alertcondition(upthrust, title="Upthrust", message="Upthrust detected")
alertcondition(testBar, title="Test Bar", message="Test Bar detected")
alertcondition(stoppingVolume, title="Stopping Volume", message="Stopping Volume detected")
alertcondition(buyingClimax, title="Buying Climax", message="Buying Climax detected")
alertcondition(trapUp, title="Trap Up Move", message="Trap Up Move detected")
alertcondition(trapDown, title="Trap Down Move", message="Trap Down Move detected")