MACD PSAR 7-14-5 Script

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-- SPDX-License-Identifier: MIT
-- IQOptionWiki QCS Library
-- IQOW MACD PSAR 7-14-5 v1.0.0
--
-- Combines a fast MACD (7, 14) with the Parabolic SAR. The MACD line crossing
-- the zero line shows momentum changing side; the SAR confirms which side of
-- price the trend stop is on. The MACD signal line (5) is not part of the rule,
-- so only the MACD line is calculated here. Add IQ Option's MACD (7, 14, 5)
-- below the chart if you want to see the zero-line cross itself.
--
-- HIGHER: the MACD line closes above zero after the previous candle was at or
--         below zero, and the Parabolic SAR dot is below the close.
-- LOWER:  the MACD line closes below zero after the previous candle was at or
--         above zero, and the Parabolic SAR dot is 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 7-14-5",
    short_name = "IQOW MACD PSAR",
    overlay = true
}

input_group {
    "1. MACD line",
    macd_fast_period = input (7, "Fast EMA period", input.integer, 2, 100),
    macd_slow_period = input (14, "Slow EMA period", input.integer, 3, 200)
}

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 {
    "Display and advice",
    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",
    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 = fast EMA minus slow EMA (same as the official MACD indicator).
macd_line = ema (close, macd_fast_period) - ema (close, macd_slow_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 sar_now = get_value (psar, nil)
local close_now = get_value (close, nil)

local periods_are_valid = macd_fast_period < macd_slow_period

-- Wait until the slow EMA has some history behind it.
local data_is_ready =
    periods_are_valid and
    get_value (close [macd_slow_period], nil) ~= nil and
    macd_now ~= nil and
    macd_previous ~= nil and
    sar_now ~= nil and
    close_now ~= nil

-- Event: the MACD line crosses the zero line on this candle.
local macd_crosses_up = data_is_ready and macd_previous <= 0 and macd_now > 0
local macd_crosses_down = data_is_ready and macd_previous >= 0 and macd_now < 0

higher_setup = conditional (macd_crosses_up and sar_now < close_now)
lower_setup = conditional (macd_crosses_down 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 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 HIGHER",
        shape_style.triangleup,
        shape_size.small,
        higher_color,
        shape_location.belowbar,
        -1,
        "HIGHER",
        signal_text_color
    )

    plot_shape (
        confirmed_lower,
        "MACD PSAR 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