DeMarker 30 70 Cross Markers

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-- SPDX-License-Identifier: MIT
-- IQOptionWiki QCS Library
-- IQOW DeMarker 30 70 Cross Markers v1.0.0
--
-- Price-chart companion of IQOW DeMarker 30 70 Cross (demarker-30-70-cross).
-- 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
-- DeMarker 30 70 Cross as well to see the DeMarker line. Keep the settings of
-- both scripts equal.
--
-- DeMarker(14) compares each candle's new highs and new lows with the
-- previous candle, then scales the result to 0-100 (formula from the official
-- Quadcode DeMarker script). Low values mean sellers keep making new lows;
-- high values mean buyers keep making new highs.
--
-- HIGHER: DeMarker closes above the oversold level (30) after being at or
--         below it on the previous candle.
-- LOWER:  DeMarker closes below the overbought level (70) after being at or
--         above it 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 DeMarker 30 70 Cross Markers",
    short_name = "MK DEM 30/70",
    overlay = true
}

input_group {
    "1. DeMarker settings",
    dem_period = input (14, "Period", input.integer, 2, 100),
    oversold_level = input (30, "Oversold level", input.double, 1, 49, 1, false),
    overbought_level = input (70, "Overbought level", input.double, 51, 99, 1, false)
}

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 }
}

-- DeMarker: average of new highs over the sum of new highs and new lows.
dem_max = max (high - high [1], 0)
dem_min = max (low [1] - low, 0)

average_max = sma (dem_max, dem_period)
average_min = sma (dem_min, dem_period)
total_range = average_max + average_min

-- A flat market (no new highs or lows) reads as neutral 50.
dem_value = iff (total_range > 0, 100 * average_max / max (total_range, 1e-10), 50)

-- Current-bar scalars for the Lua rule logic.
local dem_now = get_value (dem_value, nil)
local dem_previous = get_value (dem_value [1], nil)

local levels_are_valid = oversold_level < overbought_level

local data_is_ready =
    levels_are_valid and
    dem_now ~= nil and
    dem_previous ~= nil

-- Event: DeMarker closes back across a level on this candle.
higher_setup = conditional (
    data_is_ready and dem_previous <= oversold_level and dem_now > oversold_level
)

lower_setup = conditional (
    data_is_ready and dem_previous >= overbought_level and dem_now < overbought_level
)

-- 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,
        "DEM HIGHER",
        shape_style.triangleup,
        shape_size.small,
        higher_color,
        shape_location.belowbar,
        -1,
        "HIGHER",
        signal_text_color
    )

    plot_shape (
        confirmed_lower,
        "DEM 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