Big Body Fade Script

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-- SPDX-License-Identifier: MIT
-- IQOptionWiki QCS Library
-- IQOW Big Body Fade v1.0.0
--
-- A candle whose body (close minus open) is at least 2 ATR long is an unusually
-- big, fast move. This script marks the candle after it in the opposite direction,
-- but only while ADX is at or above its own median of the last 100 candles, so the
-- market is already moving. It is built for 2-minute candles with a 3 minute expiry.
--
-- HIGHER: the candle is red with a body of at least 2 ATR(14), and ADX(14) is at
--         or above the 50th percentile of its last 100 values.
-- LOWER:  the candle is green with a body of at least 2 ATR(14), and ADX(14) is at
--         or above the 50th percentile of its last 100 values.
--
-- The script has no clock. Run it only in the time window you choose (the
-- internal research used 00:00 to 03:00 UTC); outside that window it still marks.
--
-- 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 Big Body Fade",
    short_name = "IQOW BIGBODY",
    overlay = true
}

input_group {
    "1. Candle body",
    atr_period = input (14, "ATR period", input.integer, 2, 100),
    body_multiplier = input (2, "Body at least this many ATR", input.double, 0.5, 6, 0.1, false)
}

input_group {
    "2. ADX filter",
    adx_filter_enabled = input { default = true, name = "Use the ADX filter", type = input.boolean },
    adx_period = input (14, "ADX period", input.integer, 2, 100),
    adx_percentile = input (50, "ADX at or above this percentile of the last 100 values", input.integer, 1, 99)
}

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 }
}

-- ATR and the candle body measured in ATR.
atr_value = rma (tr, atr_period)
body_in_atr = (close - open) / max (atr_value, 1e-10)

-- ADX with Wilder smoothing: DI lines from the smoothed directional moves,
-- then the smoothed absolute DI difference.
up_move = change (high)
down_move = -change (low)
plus_dm = iff (up_move > down_move and nz (up_move) > 0, up_move, 0)
minus_dm = iff (down_move > up_move and nz (down_move) > 0, down_move, 0)
average_range = max (rma (tr, adx_period), 1e-10)
plus_di = 100 * rma (plus_dm, adx_period) / average_range
minus_di = 100 * rma (minus_dm, adx_period) / average_range
dx_value = 100 * abs (plus_di - minus_di) / max (plus_di + minus_di, 1e-10)
adx_value = rma (dx_value, adx_period)
adx_reference = percentile_nearest_rank (adx_value, 100, adx_percentile)

local body_now = get_value (body_in_atr, nil)
local adx_now = get_value (adx_value, nil)
local adx_reference_now = get_value (adx_reference, nil)
local atr_now = get_value (atr_value, nil)

local adx_is_ready = (not adx_filter_enabled) or (adx_now ~= nil and adx_reference_now ~= nil)
local data_is_ready = body_now ~= nil and atr_now ~= nil and atr_now > 0 and adx_is_ready
local adx_allows = (not adx_filter_enabled) or (adx_is_ready and adx_now >= adx_reference_now)

-- Big red candle fades up, big green candle fades down.
higher_setup = conditional (
    data_is_ready and adx_allows and body_now <= -body_multiplier
)

lower_setup = conditional (
    data_is_ready and adx_allows and body_now >= body_multiplier
)

-- 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)
)

if signals_visible then
    plot_shape (
        confirmed_higher,
        "BIGBODY HIGHER",
        shape_style.triangleup,
        shape_size.small,
        higher_color,
        shape_location.belowbar,
        -1,
        "HIGHER",
        signal_text_color
    )

    plot_shape (
        confirmed_lower,
        "BIGBODY 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