ADX EMA28 Cross Script

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-- SPDX-License-Identifier: MIT
-- IQOptionWiki QCS Library
-- IQOW ADX EMA28 Cross v1.0.0
--
-- Combines the directional indicators of ADX (+DI and -DI, period 5) with an
-- EMA 28 on price. +DI above -DI says buyers dominate the recent moves; a
-- candle closing through the EMA gives the timing. DI follows the official
-- ADX/DMS script of the Quadcode library.
--
-- HIGHER: +DI(5) is above -DI(5) and a bullish candle closes above EMA 28
--         after the previous close was at or below it.
-- LOWER:  -DI(5) is above +DI(5) and a bearish candle closes below EMA 28
--         after the previous close was at or above it.
--
-- 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 ADX EMA28 Cross",
    short_name = "IQOW ADX EMA",
    overlay = true
}

input_group {
    "1. ADX directional indicators",
    di_period = input (5, "DI period", input.integer, 2, 100)
}

input_group {
    "2. Moving average",
    ema_period = input (28, "EMA period", input.integer, 2, 300)
}

input_group {
    "Display and advice",
    ema_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",
    ema_color = input { default = "#56CEFF", type = input.color },
    ema_width = input { default = 2, 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 }
}

-- Directional movement and DI, as in the official ADX/DMS script.
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, di_period), 1e-10)

plus_di = 100 * rma (plus_dm / average_range, di_period)
minus_di = 100 * rma (minus_dm / average_range, di_period)

ema_line = ema (close, ema_period)

-- Current-bar scalars for the Lua rule logic.
local plus_now = get_value (plus_di, nil)
local minus_now = get_value (minus_di, nil)
local ema_now = get_value (ema_line, nil)
local ema_previous = get_value (ema_line [1], nil)
local close_now = get_value (close, nil)
local close_previous = get_value (close [1], nil)
local open_now = get_value (open, nil)

-- Wait until the EMA has a full period of history behind it.
local has_history = get_value (close [ema_period], nil) ~= nil

local data_is_ready =
    has_history and
    plus_now ~= nil and
    minus_now ~= nil and
    ema_now ~= nil and
    ema_previous ~= nil and
    close_now ~= nil and
    close_previous ~= nil and
    open_now ~= nil

-- Event: a bullish candle closes above the EMA after a close at or below it.
higher_setup = conditional (
    data_is_ready and
    plus_now > minus_now and
    close_previous <= ema_previous and
    close_now > ema_now and
    close_now > open_now
)

-- Mirror: a bearish candle closes below the EMA after a close at or above it.
lower_setup = conditional (
    data_is_ready and
    minus_now > plus_now and
    close_previous >= ema_previous and
    close_now < ema_now and
    close_now < open_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)
)

if ema_visible then
    plot (ema_line, "EMA", ema_color, ema_width)
end

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

    plot_shape (
        confirmed_lower,
        "ADX EMA 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