DEMA 200 and ADX Combined Indicator

//@version=5
indicator("DEMA 200 & ADX Combined Indicator", shorttitle="DEMA+ADX HUD", overlay=true)

// ==========================================
// 1. INPUT PARAMETERS
// ==========================================

// DEMA Settings
gp_dema = "=== DEMA 200 Settings ==="
dema_len = input.int(200, minval=1, title="DEMA Length", group=gp_dema)
show_dema = input.bool(true, title="Show DEMA Line", group=gp_dema)

// ADX Settings
gp_adx = "=== ADX Settings ==="
adx_len = input.int(14, minval=1, title="ADX Length", group=gp_adx)
adx_threshold = input.int(20, minval=1, title="ADX Trend Strength Threshold", group=gp_adx, tooltip="Values above this threshold indicate a strong trend (typically 20 or 25).")
adx_tf = input.timeframe("30", "ADX Timeframe", options=["30", "60"], group=gp_adx, tooltip="Select ADX calculation timeframe: 30 (30 minutes), 60 (1 hour).")
color_bg_low_adx = input.bool(false, title="Highlight Low ADX Zones (Choppy Markets)", group=gp_adx, tooltip="Colors the background when ADX is below the threshold.")

// HUD Dashboard Settings
gp_hud = "=== HUD Dashboard Settings ==="
show_hud = input.bool(true, title="Show HUD Table", group=gp_hud)
hud_pos = input.string("top_right", title="HUD Position", options=["top_right", "top_left", "bottom_right", "bottom_left"], group=gp_hud)
hud_size = input.string("small", title="Text Size", options=["auto", "tiny", "small", "normal", "large"], group=gp_hud)

// ==========================================
// 2. INDICATOR CALCULATIONS
// ==========================================

// Double Exponential Moving Average (DEMA)
dema(src, length) =>
    ema1 = ta.ema(src, length)
    ema2 = ta.ema(ema1, length)
    2 * ema1 - ema2

dema_val = dema(close, dema_len)

// Helper function to calculate DMI/ADX
f_dmi(len) =>
    [p_di, m_di, adx] = ta.dmi(len, len)
    [p_di, m_di, adx]

// Calculate ADX & Directional Movement on the requested timeframe
[plus_di, minus_di, adx_val] = request.security(syminfo.tickerid, adx_tf, f_dmi(adx_len), barmerge.gaps_off, barmerge.lookahead_off)

// Trend strength & direction conditions
is_trending = adx_val >= adx_threshold
is_bullish = plus_di > minus_di
is_bearish = minus_di > plus_di

// ==========================================
// 3. CHART PLOTS
// ==========================================

// Color DEMA line dynamically based on trend strength and direction:
// - Green: Bullish Trend (Price > DEMA and ADX >= Threshold)
// - Red: Bearish Trend (Price < DEMA and ADX >= Threshold)
// - Gray: Choppy / Weak Trend (ADX < Threshold)
dema_color = not is_trending ? color.gray : 
             (close > dema_val ? color.green : color.red)

plot(show_dema ? dema_val : na, title="DEMA 200", color=dema_color, linewidth=2)

// Color background when the market is choppy (Low ADX)
bgcolor(color_bg_low_adx and not is_trending ? color.new(color.orange, 95) : na, title="Low ADX Choppy Zone")

// ==========================================
// 4. HUD DASHBOARD TABLE
// ==========================================

// Convert position string input to Pine Script position type
getTablePosition(pos) =>
    switch pos
        "top_left"     => position.top_left
        "bottom_left"  => position.bottom_left
        "bottom_right" => position.bottom_right
        => position.top_right

// Convert text size string input to Pine Script size type
getTableTextSize(sz) =>
    switch sz
        "auto"   => size.auto
        "tiny"   => size.tiny
        "normal" => size.normal
        "large"  => size.large
        => size.small

var table hud = na
if show_hud
    hud := table.new(getTablePosition(hud_pos), 2, 5, bgcolor=color.new(color.black, 20), border_color=color.gray, border_width=1)

if show_hud and barstate.islast
    t_sz = getTableTextSize(hud_size)
    
    // Header
    table.cell(hud, 0, 0, "Indicator", text_color=color.white, bgcolor=color.blue, text_size=t_sz)
    table.cell(hud, 1, 0, "Status / Value", text_color=color.white, bgcolor=color.blue, text_size=t_sz)
    
    // Row 1: ADX (Trend Strength)
    adx_status_text = is_trending ? "Trending (" + str.tostring(adx_val, "#.#") + ")" : "Choppy (" + str.tostring(adx_val, "#.#") + ")"
    adx_status_color = is_trending ? color.green : color.orange
    tf_suffix = adx_tf == "60" ? "1H" : adx_tf == "30" ? "30m" : adx_tf
    table.cell(hud, 0, 1, "ADX (" + str.tostring(adx_len) + ") [" + tf_suffix + "]", text_color=color.white, text_size=t_sz)
    table.cell(hud, 1, 1, adx_status_text, text_color=adx_status_color, text_size=t_sz)
    
    // Row 2: DMI (+DI vs -DI)
    dmi_status_text = is_bullish ? "+DI > -DI (Bullish)" : "-DI > +DI (Bearish)"
    dmi_status_color = is_bullish ? color.green : color.red
    table.cell(hud, 0, 2, "+DI / -DI", text_color=color.white, text_size=t_sz)
    table.cell(hud, 1, 2, str.tostring(plus_di, "#.#") + " / " + str.tostring(minus_di, "#.#") + " (" + (is_bullish ? "Bull" : "Bear") + ")", text_color=dmi_status_color, text_size=t_sz)
    
    // Row 3: DEMA 200 Relation
    dema_status_text = close > dema_val ? "Price > DEMA (Bullish)" : "Price < DEMA (Bearish)"
    dema_status_color = close > dema_val ? color.green : color.red
    table.cell(hud, 0, 3, "DEMA " + str.tostring(dema_len), text_color=color.white, text_size=t_sz)
    table.cell(hud, 1, 3, dema_status_text, text_color=dema_status_color, text_size=t_sz)

    // Row 4: Combined Signal
    combined_signal = ""
    combined_color = color.white
    if is_trending
        if close > dema_val and is_bullish
            combined_signal := "Strong LONG Signal"
            combined_color := color.green
        else if close < dema_val and is_bearish
            combined_signal := "Strong SHORT Signal"
            combined_color := color.red
        else
            combined_signal := "Mixed Trend"
            combined_color := color.yellow
    else
        combined_signal := "No Trend (Avoid Trading)"
        combined_color := color.gray
        
    table.cell(hud, 0, 4, "Action Signal", text_color=color.white, text_size=t_sz)
    table.cell(hud, 1, 4, combined_signal, text_color=combined_color, text_size=t_sz)

// ==========================================
// 5. ALERT CONDITIONS
// ==========================================

alertcondition(ta.crossover(close, dema_val), title="Price Crossed Above DEMA", message="Price crossed above DEMA {{interval}}")
alertcondition(ta.crossunder(close, dema_val), title="Price Crossed Below DEMA", message="Price crossed below DEMA {{interval}}")
alertcondition(ta.crossover(adx_val, adx_threshold), title="ADX Crossed Above Threshold (Trend Starts)", message="ADX crossed above threshold ({{value}})")
alertcondition(ta.crossunder(adx_val, adx_threshold), title="ADX Crossed Below Threshold (Trend Ends)", message="ADX crossed below threshold ({{value}})")

// Combined Alert signals
long_alert = is_trending and ta.crossover(close, dema_val) and is_bullish
short_alert = is_trending and ta.crossunder(close, dema_val) and is_bearish
alertcondition(long_alert, title="Combined Buy/Long Signal", message="Combined Long Signal on {{ticker}} at {{close}}")
alertcondition(short_alert, title="Combined Sell/Short Signal", message="Combined Short Signal on {{ticker}} at {{close}}")