Double Momentum 20 3 Markers

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-- SPDX-License-Identifier: MIT
-- IQOptionWiki QCS Library
-- IQOW Double Momentum 20 3 Markers v1.0.0
--
-- Price-chart companion of IQOW Double Momentum 20 3 (double-momentum-20-3).
-- It draws no lines: only that script's HIGHER and LOWER markers, above and
-- below the candles on the price chart. A script with its own panel draws its
-- markers at the candle's price on the panel's axis, so on assets priced above
-- about 100 (for example JPY pairs) they fall outside the panel. Add IQOW
-- Double Momentum 20 3 as well to see the two Momentum lines. Keep the
-- settings of both scripts equal.
--
-- Two Momentum lines on the same chart. Momentum is the close minus the close
-- N candles ago, so it sits above zero when price is higher than it was N
-- candles back. Momentum(20) is the trend filter; Momentum(3) is the trigger.
--
-- HIGHER: Momentum(20) is above zero and Momentum(3) closes above zero after
--         being at or below zero on the previous candle.
-- LOWER:  Momentum(20) is below zero and Momentum(3) closes below zero after
--         being at or above zero on the previous 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 Double Momentum 20 3 Markers",
    short_name = "MK MOM 20/3",
    overlay = true
}

input_group {
    "1. Momentum settings",
    trend_period = input (20, "Trend Momentum period", input.integer, 2, 200),
    trigger_period = input (3, "Trigger Momentum period", input.integer, 1, 100)
}

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

input_group {
    "Colors",
    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 }
}

-- Momentum = close - close[N].
trend_momentum = change (close, trend_period)
trigger_momentum = change (close, trigger_period)

-- Current-bar scalars for the Lua rule logic.
local trend_now = get_value (trend_momentum, nil)
local trigger_now = get_value (trigger_momentum, nil)
local trigger_previous = get_value (trigger_momentum [1], nil)

-- The trigger must be the faster of the two lines.
local periods_are_valid = trigger_period < trend_period

local data_is_ready =
    periods_are_valid and
    trend_now ~= nil and
    trigger_now ~= nil and
    trigger_previous ~= nil

-- Event: the trigger closes across zero on this candle while the trend
-- Momentum already sits on the same side of zero.
higher_setup = conditional (
    data_is_ready and trend_now > 0 and trigger_previous <= 0 and trigger_now > 0
)

lower_setup = conditional (
    data_is_ready and trend_now < 0 and trigger_previous >= 0 and trigger_now < 0
)

-- 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)
)

-- Markers on the price chart: HIGHER below the candle, LOWER above it. Offset -1
-- puts each one on the candle that completed the setup (the confirmation above
-- is evaluated when the next candle opens).
if signals_visible then
    plot_shape (
        confirmed_higher,
        "MOM 20/3 HIGHER",
        shape_style.triangleup,
        shape_size.small,
        higher_color,
        shape_location.belowbar,
        -1,
        "HIGHER",
        signal_text_color
    )

    plot_shape (
        confirmed_lower,
        "MOM 20/3 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