ICT iFVG Detector and Alert [by ote618]

Description
This script detects ICT - fair value gaps (FVG) formed by price gaps between Candle 1 and Candle 3, then monitors the next 5 candles for an inverse fair value gap (iFVG).

What It Detects
Bullish FVG: When Candle 1 high is below Candle 3 low (BISI)
Bearish FVG: When Candle 1 low is above Candle 3 high (SIBI)

Once an FVG is detected, the script checks the next 5 candles:

A Bullish FVG becomes a Bearish IFVG if price closes below Candle 1 high
A Bearish FVG becomes a Bullish IFVG if price closes above Candle 1 low

Only the first bar that validates the FVG triggers the transition to an IFVG.

Visual Output
A shaded rectangle is plotted to mark the original FVG zone (from Candle 1 to Candle 3)

Color-coded:
Red for Bearish IFVG (validated Bullish IG)
Green for Bullish IFVG (validated Bearish IG)

The rectangle extends from Candle 1 to the validating bar

Alerts
You can receive alerts when an FVG becomes an IFVG:

Configurable to fire only on selected timeframes (1m, 5m, 15m, 60m)
Alerts include the direction and the chart timeframe

Settings
Enable Alerts For Timeframe: Choose which timeframe(s) trigger alerts

This tool helps traders identify inverse FVGs (iFVG), a useful ICT concept.