Trend Intensity Index Markers

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-- SPDX-License-Identifier: MIT
-- IQOptionWiki QCS Library
-- IQOW Trend Intensity Index Markers v1.0.0
--
-- Price-chart companion of IQOW Trend Intensity Index (trend-intensity-index).
-- 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
-- Trend Intensity Index as well to see the TII line. Keep the settings of both
-- scripts equal.
--
-- The Trend Intensity Index (TII) compares how much of the recent price
-- distance from a 60-period SMA is above versus below it. It reads 0 to 100:
-- high values mean strong upward pressure, low values strong downward pressure.
-- Formula follows the official IQ Option indicator.
--
-- HIGHER: TII(30) crosses above 80 while the close is above its SMA 60.
-- LOWER:  TII(30) crosses below 20 while the close is below its SMA 60.
--
-- 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 Trend Intensity Index Markers",
    short_name = "MK TII",
    overlay = true
}

input_group {
    "1. Trend Intensity Index",
    major_period = input (60, "SMA period (major)", input.integer, 3, 300),
    minor_period = input (30, "TII period (minor)", input.integer, 2, 200)
}

input_group {
    "2. Levels",
    low_level = input (20, "Low level", input.double, 5, 45, 1, false),
    high_level = input (80, "High level", input.double, 55, 95, 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 }
}

-- Distance of the close from its SMA, split into the part above and below.
major_sma = sma (close, major_period)
distance = close - major_sma
positive_sum = sum (max (distance, 0), minor_period)
negative_sum = -sum (min (distance, 0), minor_period)
tii_value = 100 * positive_sum / max (positive_sum + negative_sum, 1e-10)

-- Current-bar scalars for the Lua rule logic.
local tii_now = get_value (tii_value, nil)
local tii_before = get_value (tii_value [1], nil)
local close_now = get_value (close, nil)
local sma_now = get_value (major_sma, nil)

local settings_are_valid = minor_period <= major_period and low_level < high_level

local data_is_ready =
    settings_are_valid and
    tii_now ~= nil and
    tii_before ~= nil and
    close_now ~= nil and
    sma_now ~= nil and
    get_value (tii_value [major_period + minor_period], nil) ~= nil

-- Event: TII crosses a level on this candle while the close sits on the same side of the SMA.
higher_setup = conditional (
    data_is_ready and tii_before <= high_level and tii_now > high_level and close_now > sma_now
)
lower_setup = conditional (
    data_is_ready and tii_before >= low_level and tii_now < low_level and close_now < sma_now
)

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

    plot_shape (
        confirmed_lower,
        "TII 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