TSI Signal Cross Markers

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-- SPDX-License-Identifier: MIT
-- IQOptionWiki QCS Library
-- IQOW TSI Signal Cross Markers v1.0.0
--
-- Price-chart companion of IQOW TSI Signal Cross (tsi-signal-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 TSI Signal
-- Cross as well to see the TSI and signal lines. Keep the settings of both
-- scripts equal.
--
-- The True Strength Index (TSI) double-smooths price change and shows
-- momentum direction. A cross of the TSI line through its EMA signal line
-- is used as the timing event; the zero line adds context.
--
-- HIGHER: TSI(25, 13) crosses above its signal line (EMA 7) while TSI is below zero.
-- LOWER:  TSI(25, 13) crosses below its signal line while TSI is above zero.
--
-- 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 TSI Signal Cross Markers",
    short_name = "MK TSI",
    overlay = true
}

input_group {
    "1. True Strength Index",
    long_period = input (25, "Long period", input.integer, 2, 100),
    short_period = input (13, "Short period", input.integer, 2, 100),
    signal_period = input (7, "Signal EMA period", input.integer, 2, 50)
}

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 }
}

-- True Strength Index: double-smoothed price change over double-smoothed
-- absolute change, as in the official indicator.
price_change = change (close)
smoothed_change = ema (ema (price_change, long_period), short_period)
smoothed_abs_change = ema (ema (abs (price_change), long_period), short_period)
tsi_value = 100 * smoothed_change / max (smoothed_abs_change, 1e-10)
signal_line = ema (tsi_value, signal_period)

-- Current-bar scalars for the Lua rule logic.
local tsi_now = get_value (tsi_value, nil)
local tsi_before = get_value (tsi_value [1], nil)
local signal_now = get_value (signal_line, nil)
local signal_before = get_value (signal_line [1], nil)

local data_is_ready =
    tsi_now ~= nil and
    tsi_before ~= nil and
    signal_now ~= nil and
    signal_before ~= nil and
    get_value (tsi_value [long_period + short_period], nil) ~= nil

-- Event: TSI crosses its signal line on this candle, on the matching side of zero.
higher_setup = conditional (
    data_is_ready and tsi_before <= signal_before and tsi_now > signal_now and tsi_now < 0
)
lower_setup = conditional (
    data_is_ready and tsi_before >= signal_before and tsi_now < signal_now and tsi_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,
        "TSI HIGHER",
        shape_style.triangleup,
        shape_size.small,
        higher_color,
        shape_location.belowbar,
        -1,
        "HIGHER",
        signal_text_color
    )

    plot_shape (
        confirmed_lower,
        "TSI 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