MACD PSAR EMA Script

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-- SPDX-License-Identifier: MIT
-- IQOptionWiki QCS Library
-- IQOW MACD PSAR EMA v1.0.0
--
-- Combines MACD (12, 26, 9), the Parabolic SAR and a short EMA, as in the
-- related article. A MACD signal-line cross shows momentum turning, the candle
-- colour and EMA position show price agrees, and the SAR shows the trailing stop
-- is on the matching side of price.
--
-- HIGHER: the MACD line crosses above its signal line on a bullish candle that
--         closes above the EMA, with the Parabolic SAR below the close.
-- LOWER:  the MACD line crosses below its signal line on a bearish candle that
--         closes below the EMA, with the Parabolic SAR above the close.
--
-- 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 MACD PSAR EMA",
    short_name = "IQOW MACD EMA",
    overlay = true
}

input_group {
    "1. MACD",
    macd_fast_period = input (12, "Fast EMA period", input.integer, 2, 100),
    macd_slow_period = input (26, "Slow EMA period", input.integer, 3, 200),
    macd_signal_period = input (9, "Signal period", input.integer, 2, 100)
}

input_group {
    "2. Parabolic SAR",
    sar_start = input (0.02, "Start", input.double, 0.01, 1, 0.01),
    sar_step = input (0.02, "Step", input.double, 0.01, 1, 0.01),
    sar_maximum = input (0.2, "Maximum", input.double, 0.01, 1, 0.01)
}

input_group {
    "3. EMA",
    ema_period = input (10, "EMA period", input.integer, 2, 300)
}

input_group {
    "Display and advice",
    ema_visible = input { default = true, type = input.plot_visibility },
    sar_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 = "#FFD166", type = input.color },
    ema_width = input { default = 2, type = input.line_width },
    sar_color = input { default = "#56CEFF", type = input.color },
    sar_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 }
}

-- MACD line and signal line (same as the official MACD indicator).
macd_line = ema (close, macd_fast_period) - ema (close, macd_slow_period)
signal_line = ema (macd_line, macd_signal_period)
trend_ema = ema (close, ema_period)
psar = sar (sar_start, sar_step, sar_maximum)

local macd_now = get_value (macd_line, nil)
local macd_previous = get_value (macd_line [1], nil)
local signal_now = get_value (signal_line, nil)
local signal_previous = get_value (signal_line [1], nil)
local ema_now = get_value (trend_ema, nil)
local sar_now = get_value (psar, nil)
local close_now = get_value (close, nil)
local open_now = get_value (open, nil)

local periods_are_valid = macd_fast_period < macd_slow_period

local data_is_ready =
    periods_are_valid and
    get_value (close [macd_slow_period + macd_signal_period], nil) ~= nil and
    macd_now ~= nil and
    macd_previous ~= nil and
    signal_now ~= nil and
    signal_previous ~= nil and
    ema_now ~= nil and
    sar_now ~= nil and
    close_now ~= nil and
    open_now ~= nil

-- Event: the MACD line crosses its signal line on this candle.
local macd_crosses_up = data_is_ready and macd_previous <= signal_previous and macd_now > signal_now
local macd_crosses_down = data_is_ready and macd_previous >= signal_previous and macd_now < signal_now

higher_setup = conditional (
    macd_crosses_up and
    close_now > open_now and
    close_now > ema_now and
    sar_now < close_now
)

lower_setup = conditional (
    macd_crosses_down and
    close_now < open_now and
    close_now < ema_now and
    sar_now > close_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 (trend_ema, "EMA", ema_color, ema_width)
end

if sar_visible then
    plot (psar, "Parabolic SAR", sar_color, sar_width, 0, style.points)
end

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

    plot_shape (
        confirmed_lower,
        "MACD PSAR 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