SMA 8 21 Cross Script

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-- SPDX-License-Identifier: MIT
-- IQOptionWiki QCS Library
-- IQOW SMA 8 21 Cross v1.0.0
--
-- Two simple moving averages (8 and 21). The faster average crossing the slower
-- one marks a change in short-term direction; requiring the candle to close
-- beyond both averages filters out crosses where price has not followed.
--
-- HIGHER: SMA 8 crosses above SMA 21 and the candle closes above both.
-- LOWER:  SMA 8 crosses below SMA 21 and the candle closes below both.
--
-- 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 SMA 8 21 Cross",
    short_name = "IQOW SMA 8/21",
    overlay = true
}

input_group {
    "1. Moving averages",
    fast_period = input (8, "Fast SMA period", input.integer, 2, 100),
    slow_period = input (21, "Slow SMA period", input.integer, 3, 300)
}

input_group {
    "Display and advice",
    averages_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",
    fast_color = input { default = "#FFD166", type = input.color },
    slow_color = input { default = "#56CEFF", type = input.color },
    average_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 }
}

fast_sma = sma (close, fast_period)
slow_sma = sma (close, slow_period)

local fast_now = get_value (fast_sma, nil)
local slow_now = get_value (slow_sma, nil)
local fast_previous = get_value (fast_sma [1], nil)
local slow_previous = get_value (slow_sma [1], nil)
local close_now = get_value (close, nil)

local periods_are_valid = fast_period < slow_period

local data_is_ready =
    periods_are_valid and
    fast_now ~= nil and
    slow_now ~= nil and
    fast_previous ~= nil and
    slow_previous ~= nil and
    close_now ~= nil

-- Event: the fast average crosses the slow average on this candle.
local crosses_up = data_is_ready and fast_previous <= slow_previous and fast_now > slow_now
local crosses_down = data_is_ready and fast_previous >= slow_previous and fast_now < slow_now

higher_setup = conditional (crosses_up and close_now > fast_now and close_now > slow_now)
lower_setup = conditional (crosses_down and close_now < fast_now and close_now < slow_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 averages_visible then
    plot (fast_sma, "Fast SMA", fast_color, average_width)
    plot (slow_sma, "Slow SMA", slow_color, average_width)
end

if signals_visible then
    plot_shape (
        confirmed_higher,
        "SMA 8/21 HIGHER",
        shape_style.triangleup,
        shape_size.small,
        higher_color,
        shape_location.belowbar,
        -1,
        "HIGHER",
        signal_text_color
    )

    plot_shape (
        confirmed_lower,
        "SMA 8/21 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