Aroon Oscillator Zero Cross Markers

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-- SPDX-License-Identifier: MIT
-- IQOptionWiki QCS Library
-- IQOW Aroon Oscillator Zero Cross Markers v1.0.0
--
-- Price-chart companion of IQOW Aroon Oscillator Zero Cross
-- (aroon-oscillator-zero-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 Aroon Oscillator Zero Cross as well to see the
-- Aroon Oscillator line. Keep the settings of both scripts equal.
--
-- Aroon Oscillator(25) is Aroon Up minus Aroon Down: how recently the highest
-- high and the lowest low of the last 25 candles occurred (formula from the
-- official Quadcode script, scaled to -100..+100). Above zero means the high
-- is more recent than the low; below zero means the low is more recent.
--
-- HIGHER: the Aroon Oscillator closes above zero after being at or below
--         zero on the previous candle.
-- LOWER:  the Aroon Oscillator 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 Aroon Oscillator Zero Cross Markers",
    short_name = "MK AROON",
    overlay = true
}

input_group {
    "1. Aroon settings",
    aroon_period = input (25, "Period", input.integer, 2, 200)
}

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 }
}

-- Aroon Oscillator = Aroon Up - Aroon Down, in the range -100..+100.
aroon_value = (bars_since_lowest (aroon_period) - bars_since_highest (aroon_period)) / aroon_period * 100

-- Current-bar scalars for the Lua rule logic.
local aroon_now = get_value (aroon_value, nil)
local aroon_previous = get_value (aroon_value [1], nil)

local has_history = get_value (close [aroon_period], nil) ~= nil

local data_is_ready =
    has_history and
    aroon_now ~= nil and
    aroon_previous ~= nil

-- Event: the oscillator closes across zero on this candle.
higher_setup = conditional (
    data_is_ready and aroon_previous <= 0 and aroon_now > 0
)

lower_setup = conditional (
    data_is_ready and aroon_previous >= 0 and aroon_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,
        "AROON HIGHER",
        shape_style.triangleup,
        shape_size.small,
        higher_color,
        shape_location.belowbar,
        -1,
        "HIGHER",
        signal_text_color
    )

    plot_shape (
        confirmed_lower,
        "AROON 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