Fisher Transform Reversal Markers

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-- SPDX-License-Identifier: MIT
-- IQOptionWiki QCS Library
-- IQOW Fisher Transform Reversal Markers v1.0.0
--
-- Price-chart companion of IQOW Fisher Transform Reversal
-- (fisher-transform-reversal). 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 Fisher Transform Reversal as well to see the
-- Fisher lines. Keep the settings of both scripts equal.
--
-- Ehlers Fisher Transform turns price into a series that swings clearly at
-- turning points. The trigger line is the Fisher value one candle earlier. A
-- cross of the two lines inside an extreme zone is read as a possible turn,
-- the confirmation the related article describes. Formula follows the official
-- QCS Ehlers Fisher Transform; the value is clamped to avoid division by zero.
--
-- HIGHER: Fisher crosses above its trigger while below -1.5.
-- LOWER:  Fisher crosses below its trigger while above +1.5.
--
-- 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 Fisher Transform Reversal Markers",
    short_name = "MK FISHER",
    overlay = true
}

input_group {
    "1. Fisher Transform",
    fisher_period = input (10, "Period", input.integer, 3, 100),
    extreme_level = input (1.5, "Extreme level (+/-)", input.double, 0.5, 4, 0.1, 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 }
}

-- Fisher Transform (official formula): normalise hl2 to -1..1, smooth, then
-- apply the inverse hyperbolic tangent and smooth again.
highest_hl2 = highest (hl2, fisher_period)
lowest_hl2 = lowest (hl2, fisher_period)
normalized = 2 * (hl2 - lowest_hl2) / max (highest_hl2 - lowest_hl2, 1e-10) - 1
smoothed = ema (normalized, 5)
-- Clamp just inside +/-1 so log () stays finite on flat or extreme candles.
clamped = iff (smoothed > 0.999, 0.999, iff (smoothed < -0.999, -0.999, smoothed))
fisher = ema (log ((1 + clamped) / (1 - clamped)), 3)
fisher_trigger = fisher [1]

local fisher_now = get_value (fisher, nil)
local fisher_before = get_value (fisher [1], nil)
local fisher_before_that = get_value (fisher [2], nil)

local data_is_ready = fisher_now ~= nil and fisher_before ~= nil and fisher_before_that ~= nil

-- Cross event: Fisher moves through the trigger (the previous Fisher value).
local crosses_up = data_is_ready and fisher_before <= fisher_before_that and fisher_now > fisher_before
local crosses_down = data_is_ready and fisher_before >= fisher_before_that and fisher_now < fisher_before

higher_setup = conditional (crosses_up and fisher_now <= -extreme_level)
lower_setup = conditional (crosses_down and fisher_now >= extreme_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,
        "FISHER HIGHER",
        shape_style.triangleup,
        shape_size.small,
        higher_color,
        shape_location.belowbar,
        -1,
        "HIGHER",
        signal_text_color
    )

    plot_shape (
        confirmed_lower,
        "FISHER 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