Elder Impulse Script

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-- SPDX-License-Identifier: MIT
-- IQOptionWiki QCS Library
-- IQOW Elder Impulse v1.0.0
--
-- Elder Impulse System: the 13-period EMA gives trend direction and the MACD
-- histogram gives momentum. When both rise the impulse is green; when both
-- fall it is red; otherwise neutral. Formulas follow the official indicator.
--
-- HIGHER: the first candle where EMA 13 is rising and the MACD(12,26,9)
--         histogram is rising (green impulse) after a non-green candle.
-- LOWER:  the first candle where both are falling (red impulse) after a
--         non-red candle.
--
-- Markers use the previous completed candle: they appear after the next candle
-- opens and are shifted back one bar onto the candle that qualified.
-- Educational chart tool only. It does not place trades, choose an expiry,
-- predict outcomes, or guarantee results. Test on a Practice balance first.

instrument {
    name = "IQOW Elder Impulse",
    short_name = "IQOW ELDER",
    overlay = true
}

input_group {
    "1. Trend EMA",
    ema_period = input (13, "EMA period", input.integer, 2, 200)
}

input_group {
    "2. MACD histogram",
    fast_period = input (12, "Fast period", input.integer, 2, 100),
    slow_period = input (26, "Slow period", input.integer, 3, 200),
    signal_period = input (9, "Signal period", input.integer, 2, 100)
}

input_group {
    "Display and advice",
    lines_visible = input { default = true, type = input.plot_visibility },
    impulse_candles_visible = input { default = false, type = input.plot_visibility },
    signals_visible = input { default = true, type = input.plot_visibility },
    advice_enabled = input { default = false, name = "Enable platform advice", type = input.boolean }
}

input_group {
    "Colors",
    ema_color = input { default = "#FFB020", type = input.color },
    impulse_up_color = input { default = "#2CAC40", type = input.color },
    impulse_neutral_color = input { default = "#C7CAD1", type = input.color },
    impulse_down_color = input { default = "#DB4931", type = input.color },
    line_width = input { default = 1, type = input.line_width },
    higher_color = input { default = "#25E154", type = input.color },
    lower_color = input { default = "#FF6C58", type = input.color },
    signal_text_color = input { default = "#FFFFFF", type = input.color }
}

-- Trend: EMA 13. Momentum: MACD histogram (MACD minus its SMA signal line).
trend_ema = ema (close, ema_period)
macd_line = ema (close, fast_period) - ema (close, slow_period)
macd_histogram = macd_line - sma (macd_line, signal_period)

-- Current-bar scalars for the Lua rule logic.
local ema_now = get_value (trend_ema, nil)
local ema_before = get_value (trend_ema [1], nil)
local hist_now = get_value (macd_histogram, nil)
local hist_before = get_value (macd_histogram [1], nil)

local periods_are_valid = fast_period < slow_period

local data_is_ready =
    periods_are_valid and
    ema_now ~= nil and
    ema_before ~= nil and
    hist_now ~= nil and
    hist_before ~= nil and
    get_value (macd_histogram [slow_period + signal_period], nil) ~= nil

-- Impulse state on this candle. Markers fire when the state first appears.
local impulse_is_green = data_is_ready and ema_now > ema_before and hist_now > hist_before
local impulse_is_red = data_is_ready and ema_now < ema_before and hist_now < hist_before

higher_setup = conditional (impulse_is_green)
lower_setup = conditional (impulse_is_red)

-- Confirm only a new setup on the previous completed candle.
confirmed_higher = conditional (
    get_value (higher_setup [1], false) and
    not get_value (higher_setup [2], false)
)

confirmed_lower = conditional (
    get_value (lower_setup [1], false) and
    not get_value (lower_setup [2], false)
)

if lines_visible then
    plot (trend_ema, "EMA trend", ema_color, line_width)
end

-- Optional impulse-coloured copy of the price candles.
if impulse_candles_visible then
    local impulse_color = impulse_is_green and impulse_up_color
        or (impulse_is_red and impulse_down_color or impulse_neutral_color)
    plot_candle (open, high, low, close, "Impulse candles", impulse_color)
end

if signals_visible then
    plot_shape (
        confirmed_higher,
        "ELDER HIGHER",
        shape_style.triangleup,
        shape_size.small,
        higher_color,
        shape_location.belowbar,
        -1,
        "HIGHER",
        signal_text_color
    )

    plot_shape (
        confirmed_lower,
        "ELDER LOWER",
        shape_style.triangledown,
        shape_size.small,
        lower_color,
        shape_location.abovebar,
        -1,
        "LOWER",
        signal_text_color
    )
end

-- QCS advice is a platform notification state only; it does not place trades.
if advice_enabled and
    get_value (confirmed_higher, false) and
    not get_value (confirmed_lower, false) then
    advise (advice.buy)
elseif advice_enabled and
    get_value (confirmed_lower, false) and
    not get_value (confirmed_higher, false) then
    advise (advice.sell)
else
    advise (advice.neutral)
end