Pin Bar Bollinger Script

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-- SPDX-License-Identifier: MIT
-- IQOptionWiki QCS Library
-- IQOW Pin Bar Bollinger v1.0.0
--
-- A pin bar is a candle with a long wick and a small body: price pushed out and
-- was rejected. Here the rejection must happen at the outer Bollinger Band.
-- Geometry (inputs): the wick must be at least 2x the body and at least 60% of
-- the whole candle range. Zero-range candles are ignored.
--
-- HIGHER: bullish pin bar (long lower wick) whose low touches or pierces the
--         lower Bollinger Band (20, 2) and which closes back inside the band.
-- LOWER:  shooting-star pin bar (long upper wick) whose high touches or pierces
--         the upper band and which closes back inside the band.
--
-- 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 Pin Bar Bollinger",
    short_name = "IQOW PIN BB",
    overlay = true
}

input_group {
    "1. Bollinger Bands",
    bb_period = input (20, "Period", input.integer, 2, 200),
    bb_deviation = input (2, "Deviation", input.double, 0.5, 5, 0.1, false)
}

input_group {
    "2. Pin bar geometry",
    wick_to_body = input (2, "Wick at least X times the body", input.double, 1, 10, 0.5, false),
    wick_share = input (0.6, "Wick at least this share of the range", input.double, 0.4, 0.95, 0.05, false)
}

input_group {
    "Display and advice",
    lines_visible = input { default = true, type = input.plot_visibility },
    middle_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",
    band_color = input { default = "#56CEFF", type = input.color },
    band_fill_color = input { default = rgba(86, 206, 255, 0.06), type = input.color },
    middle_color = input { default = rgba(255, 255, 255, 0.35), 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 }
}

-- Candle geometry. A pin bar has a long wick on one side and a small body.
local open_now = get_value (open, nil)
local high_now = get_value (high, nil)
local low_now = get_value (low, nil)
local close_now = get_value (close, nil)

middle_band = sma (close, bb_period)
band_offset = stdev (close, bb_period) * bb_deviation
upper_band = middle_band + band_offset
lower_band = middle_band - band_offset

local upper_now = get_value (upper_band, nil)
local lower_now = get_value (lower_band, nil)

local data_is_ready =
    open_now ~= nil and high_now ~= nil and low_now ~= nil and close_now ~= nil and
    upper_now ~= nil and lower_now ~= nil

local candle_range = 0
local body_size = 0
local lower_wick = 0
local upper_wick = 0
if data_is_ready then
    candle_range = high_now - low_now
    body_size = math.abs (close_now - open_now)
    lower_wick = math.min (open_now, close_now) - low_now
    upper_wick = high_now - math.max (open_now, close_now)
end
local has_range = candle_range > 1e-10

local bullish_pin =
    data_is_ready and has_range and
    lower_wick >= wick_to_body * body_size and
    lower_wick >= wick_share * candle_range

local bearish_pin =
    data_is_ready and has_range and
    upper_wick >= wick_to_body * body_size and
    upper_wick >= wick_share * candle_range

-- The rejection wick reaches the band, and the candle closes back inside it.
higher_setup = conditional (bullish_pin and low_now <= lower_now and close_now > lower_now)
lower_setup = conditional (bearish_pin and high_now >= upper_now and close_now < upper_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
    fill (upper_band, lower_band, "Bollinger area", band_fill_color)
    plot (upper_band, "Upper band", band_color, line_width)
    plot (lower_band, "Lower band", band_color, line_width)
end

if middle_visible then
    plot (middle_band, "Middle band (SMA)", middle_color, 1)
end

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

    plot_shape (
        confirmed_lower,
        "PIN BB 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