Stella's Volume Spike Detector

//@version=6
indicator("Stella's Volume Spike Detector", overlay=true, max_labels_count=500)

// ============================================
// パラメーター設定
// ============================================
lookbackPeriod = input.int(20, "ルックバック期間", minval=5, maxval=100)
spikeMultiplier = input.float(2.0, "急増判定倍率", minval=1.0, maxval=5.0, step=0.1)

// 表示設定
showLabels = input.bool(true, "ラベルを表示")
showBackground = input.bool(true, "背景色を表示")

// 色
bullishColor = input.color(color.new(color.green, 0))
bearishColor = input.color(color.new(color.red, 0))

// ============================================
// ボリューム計算
// ============================================
avgVolume = ta.sma(volume, lookbackPeriod)
isSpike = volume > avgVolume * spikeMultiplier

// 価格方向
isBullish = close > open
isBearish = close < open

// スパイクタイプ
bullishSpike = isSpike and isBullish
bearishSpike = isSpike and isBearish

// ============================================
// 表示
// ============================================
// 背景色
bgcolor(showBackground and bullishSpike ? color.new(color.green, 85) : showBackground and bearishSpike ? color.new(color.red, 85) : na)

// ラベル
if showLabels and bullishSpike
    label.new(bar_index, high, "🟢 VOL x" + str.tostring(volume / avgVolume, "#.#"), 
              color=color.new(color.green, 80), textcolor=color.white, 
              style=label.style_label_down, size=size.tiny)

if showLabels and bearishSpike
    label.new(bar_index, low, "🔴 VOL x" + str.tostring(volume / avgVolume, "#.#"), 
              color=color.new(color.red, 80), textcolor=color.white, 
              style=label.style_label_up, size=size.tiny)

// ============================================
// アラート条件
// ============================================
alertcondition(bullishSpike, "買いボリューム急増", "買いボリュームが平均の{{ticker}}倍に急増")
alertcondition(bearishSpike, "売りボリューム急増", "売りボリュームが平均の{{ticker}}倍に急増")
alertcondition(isSpike, "ボリューム急増", "ボリュームが平均の{{ticker}}倍に急増")

// ============================================
// 情報パネル（オプション）
// ============================================
var table infoPanel = table.new(position.top_right, 2, 3, bgcolor=color.new(color.black, 90), border_width=1)

if barstate.islast
    table.cell(infoPanel, 0, 0, "平均ボリューム", text_color=color.white, text_size=size.small)
    table.cell(infoPanel, 1, 0, str.tostring(avgVolume, "#,###"), text_color=color.white, text_size=size.small)
    table.cell(infoPanel, 0, 1, "現在ボリューム", text_color=color.white, text_size=size.small)
    table.cell(infoPanel, 1, 1, str.tostring(volume, "#,###"), text_color=color.white, text_size=size.small)
    table.cell(infoPanel, 0, 2, "倍率", text_color=color.white, text_size=size.small)
    table.cell(infoPanel, 1, 2, str.tostring(volume / avgVolume, "#.#") + "x", 
               text_color=isSpike ? color.green : color.white, text_size=size.small)