Keltner Re-entry Script

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-- SPDX-License-Identifier: MIT
-- IQOptionWiki QCS Library
-- IQOW Keltner Re-entry v1.0.0
--
-- Keltner Channel: EMA of the typical price (hlc3) in the middle, with bands
-- set a multiple of ATR (RMA of the true range) above and below, as in the
-- official Quadcode Keltner Channels script. A close outside a band shows
-- stretched price; the next close back inside is the marked event.
--
-- HIGHER: the previous close was below the lower band and the current close
--         is back inside the channel.
-- LOWER:  the previous close was above the upper band and the current close
--         is back inside the channel.
--
-- 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 Keltner Re-entry",
    short_name = "IQOW KC REENT",
    overlay = true
}

input_group {
    "1. Keltner Channel",
    channel_period = input (20, "Period (EMA and ATR)", input.integer, 2, 200),
    channel_multiplier = input (2, "ATR multiplier", input.double, 0.1, 10, 0.1)
}

input_group {
    "Display and advice",
    channel_visible = input { default = true, type = input.plot_visibility },
    middle_visible = input { default = true, type = input.plot_visibility },
    signals_visible = input { default = true, type = input.plot_visibility },
    advice_enabled = input { default = false, name = "Enable platform advice", type = input.boolean }
}

input_group {
    "Colors",
    channel_color = input { default = "#21B190", type = input.color },
    middle_color = input { default = rgba(33, 177, 144, 0.6), type = input.color },
    channel_fill_color = input { default = rgba(33, 177, 144, 0.08), type = input.color },
    channel_width = input { default = 1, type = input.line_width },
    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 }
}

-- Keltner Channel as in the official library script.
middle_line = ema (hlc3, channel_period)
band_offset = rma (tr, channel_period) * channel_multiplier
upper_band = middle_line + band_offset
lower_band = middle_line - band_offset

-- Current-bar scalars for the Lua rule logic.
local close_now = get_value (close, nil)
local close_previous = get_value (close [1], nil)
local upper_now = get_value (upper_band, nil)
local lower_now = get_value (lower_band, nil)
local upper_previous = get_value (upper_band [1], nil)
local lower_previous = get_value (lower_band [1], nil)

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

local data_is_ready =
    has_history and
    close_now ~= nil and
    close_previous ~= nil and
    upper_now ~= nil and
    lower_now ~= nil and
    upper_previous ~= nil and
    lower_previous ~= nil

-- "Back inside": the current close is between the two bands.
local closes_inside = data_is_ready and close_now > lower_now and close_now < upper_now

-- Event: previous close outside one band, this close back inside.
higher_setup = conditional (
    closes_inside and close_previous < lower_previous
)

lower_setup = conditional (
    closes_inside and close_previous > upper_previous
)

-- 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 channel_visible then
    fill (upper_band, lower_band, "Keltner area", channel_fill_color)
    plot (upper_band, "Upper Keltner", channel_color, channel_width)
    plot (lower_band, "Lower Keltner", channel_color, channel_width)
end

if middle_visible then
    plot (middle_line, "Keltner middle", middle_color, 1)
end

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

    plot_shape (
        confirmed_lower,
        "KC REENT 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