Heikin Ashi EMA Script

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-- SPDX-License-Identifier: MIT
-- IQOptionWiki QCS Library
-- IQOW Heikin Ashi EMA v1.0.0
--
-- Heikin-Ashi candles smooth price into runs of same-colour candles. A turn
-- from a bearish run to a bullish candle, taken only on the correct side of
-- EMA 50, marks a possible shift back to the longer-term direction.
-- The Heikin-Ashi values are calculated here; your chart can stay on normal
-- candles. Optional Heikin-Ashi candles can be drawn from the display inputs.
--
-- HIGHER: a Heikin-Ashi candle turns bullish (HA close above HA open) after two
--         bearish Heikin-Ashi candles, and the real close is above EMA 50.
-- LOWER:  a Heikin-Ashi candle turns bearish after two bullish Heikin-Ashi
--         candles, and the real close is below EMA 50.
--
-- 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 Heikin Ashi EMA",
    short_name = "IQOW HA EMA",
    overlay = true
}

input_group {
    "1. Trend filter",
    ema_period = input (50, "EMA period", input.integer, 2, 300),
    bearish_run = input (2, "Candles in the run before the turn", input.integer, 1, 5)
}

input_group {
    "Display and advice",
    lines_visible = input { default = true, type = input.plot_visibility },
    ha_candles_visible = input { default = false, 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 = "#FFB020", type = input.color },
    ha_up_color = input { default = "#25E154", type = input.color },
    ha_down_color = input { default = "#FF6C58", type = input.color },
    line_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 }
}

-- Heikin-Ashi candle: averaged close, open from the previous HA candle.
ha_close = ohlc4
ha_open = iff (na (ha_open [1]), (open + close) / 2, (ha_open [1] + ha_close [1]) / 2)
ha_high = max (high, ha_open, ha_close)
ha_low = min (low, ha_open, ha_close)

ema_filter = ema (close, ema_period)

-- Current-bar scalars for the Lua rule logic.
local ha_close_now = get_value (ha_close, nil)
local ha_open_now = get_value (ha_open, nil)
local close_now = get_value (close, nil)
local ema_now = get_value (ema_filter, nil)

local data_is_ready =
    ha_close_now ~= nil and
    ha_open_now ~= nil and
    close_now ~= nil and
    get_value (ema_filter [ema_period], nil) ~= nil and
    get_value (ha_open [bearish_run], nil) ~= nil

-- Count how many Heikin-Ashi candles in a row were bearish / bullish
-- immediately before the current candle.
local bearish_before = true
local bullish_before = true
if data_is_ready then
    for back = 1, bearish_run do
        if get_value (ha_close [back], 0) >= get_value (ha_open [back], 0) then
            bearish_before = false
        end
        if get_value (ha_close [back], 0) <= get_value (ha_open [back], 0) then
            bullish_before = false
        end
    end
end

-- Event: the Heikin-Ashi colour turns on this candle.
higher_setup = conditional (
    data_is_ready and ha_close_now > ha_open_now and bearish_before and close_now > ema_now
)
lower_setup = conditional (
    data_is_ready and ha_close_now < ha_open_now and bullish_before and close_now < ema_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 lines_visible then
    plot (ema_filter, "EMA filter", ema_color, line_width)
end

-- Optional Heikin-Ashi candles drawn over the price candles.
if ha_candles_visible then
    local ha_candle_color = ha_close_now ~= nil and ha_open_now ~= nil and ha_close_now >= ha_open_now
        and ha_up_color or ha_down_color
    plot_candle (ha_open, ha_high, ha_low, ha_close, "Heikin-Ashi", ha_candle_color)
end

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

    plot_shape (
        confirmed_lower,
        "HA 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