Harami RSI Script

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-- SPDX-License-Identifier: MIT
-- IQOptionWiki QCS Library
-- IQOW Harami RSI v1.0.1
--
-- A harami is a two-candle pattern: a full candle followed by a small
-- opposite-colour candle whose body sits inside the first candle's body.
-- RSI checks that the pattern appears after a push into an oversold or
-- overbought area.
--
-- RSI follows IQ Option's built-in RSI: closing prices, with the average gain
-- and the average loss smoothed by an exponential average (alpha 2 / (period +
-- 1)). Version 1.0.1 (9 October 2026) changed this from Wilder smoothing; the
-- inputs, periods and levels are unchanged.
--
-- HIGHER: candle 1 is a full bearish candle, candle 2 (this candle) is
--         bullish with a body at most 50% of candle 1's body and fully
--         inside it, and RSI(14) is below 40.
-- LOWER:  mirror image, with RSI(14) above 60.
--
-- 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 Harami RSI",
    short_name = "IQOW HARAMI",
    overlay = true
}

input_group {
    "1. Candle geometry",
    first_body_ratio = input (0.5, "First candle: minimum body share of range", input.double, 0.1, 0.95, 0.05, false),
    max_body_ratio = input (0.5, "Second candle: maximum body share of first body", input.double, 0.05, 0.95, 0.05, false)
}

input_group {
    "2. RSI",
    rsi_period = input (14, "RSI period", input.integer, 2, 100),
    oversold_level = input (40, "Bullish harami: RSI below", input.double, 5, 50, 1, false),
    overbought_level = input (60, "Bearish harami: RSI above", input.double, 50, 95, 1, false)
}

input_group {
    "Display and advice",
    signals_visible = input { default = true, type = input.plot_visibility },
    advice_enabled = input { default = false, name = "Enable platform advice", type = input.boolean }
}

input_group {
    "Colors",
    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 }
}

-- RSI as IQ Option's built-in RSI draws it: the average gain and the average
-- loss are exponential averages (alpha = 2 / (period + 1)), not Wilder's
-- smoothing (alpha = 1 / period). It stays empty until both averages exist and
-- is 50 when price did not move at all.
rsi_change = close - close [1]
rsi_gain = ema (max (rsi_change, 0), rsi_period)
rsi_loss = ema (max (-rsi_change, 0), rsi_period)
rsi_total = rsi_gain + rsi_loss
rsi_value = iff (rsi_total > 0, 100 * rsi_gain / rsi_total, rsi_total + 50)

-- Candle 1 is the previous bar, candle 2 is this bar.
local open_1 = get_value (open [1], nil)
local close_1 = get_value (close [1], nil)
local high_1 = get_value (high [1], nil)
local low_1 = get_value (low [1], nil)
local open_2 = get_value (open, nil)
local close_2 = get_value (close, nil)
local rsi_now = get_value (rsi_value, nil)

local levels_are_valid = oversold_level < overbought_level

local data_is_ready =
    levels_are_valid and
    open_1 ~= nil and close_1 ~= nil and high_1 ~= nil and low_1 ~= nil and
    open_2 ~= nil and close_2 ~= nil and
    rsi_now ~= nil

local body_1 = data_is_ready and math.abs (close_1 - open_1) or 0
local range_1 = data_is_ready and (high_1 - low_1) or 0
local body_2 = data_is_ready and math.abs (close_2 - open_2) or 0
local first_is_full = range_1 > 0 and body_1 >= first_body_ratio * range_1
local second_is_small = body_1 > 0 and body_2 > 0 and body_2 <= max_body_ratio * body_1

-- Bullish harami: bearish candle 1, bullish candle 2 with both open and
-- close inside candle 1's body (between its close and open).
local bullish_harami =
    data_is_ready and first_is_full and second_is_small and
    close_1 < open_1 and close_2 > open_2 and
    open_2 >= close_1 and close_2 <= open_1 and
    rsi_now < oversold_level

local bearish_harami =
    data_is_ready and first_is_full and second_is_small and
    close_1 > open_1 and close_2 < open_2 and
    open_2 <= close_1 and close_2 >= open_1 and
    rsi_now > overbought_level

higher_setup = conditional (bullish_harami)
lower_setup = conditional (bearish_harami)

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

    plot_shape (
        confirmed_lower,
        "Harami 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