FVG MTF + 50%

// This indicator identifies Fair Value Gaps (FVGs) on M15, H1, and H4 timeframes, highlights them on the chart as colored boxes, draws the 50% median line,
// and displays price labels for the 0%, 50%, and 100% levels of each gap.
// It also tracks when gaps are “filled” (mitigated) and logs counts on a dashboard, providing real-time metrics on open/filled FVGs for liquidity analysis.
//
// Key Features:
//   1. Multi‐Timeframe Detection: Scans M15, H1, H4 for three‐bar FVG patterns using a configurable threshold.
//   2. Colored Zones and Median Lines: Draws bullish (green) and bearish (red) gap boxes, bordered in white, with a dashed white line at the midpoint.
//   3. Price Labels: Optionally annotates each gap with “0% FVG = $X,” “50% FVG = $Y,” and “100% FVG = $Z” at the moment of detection.
//   4. Gap Mitigation: Monitors price re‐entry into a gap; when filled, it removes the box and logs a dashed line at the fill price.
//   5. Dashboard: Counts total bullish/bearish FVGs and calculates the percentage filled on each timeframe.
//   6. Alerts: Configurable alerts for new gap creation and fill events at 0%, 50%, and 100% levels.
//
// Implementation Details:
//   • Detection Logic: A three-bar gap occurs when the middle bar’s low is above the prior bar’s high (bullish) or its high is below the prior bar’s low (bearish).
//     A “threshold” parameter filters minor gaps based on relative size.
//   • Data Structures: Uses Pine v6’s user‐defined “fvg” type to store gap high, low, direction, and timestamp. Arrays track open boxes, lines, labels for each timeframe.
//   • Drawing:
//       – box.new() draws transparent rectangles spanning 500 bars into the future.
//       – line.new() draws dashed median lines and mitigation lines when gaps are filled.
//       – label.new() places price annotations at the current right edge with textalign=text.align_right.
//   • Dashboard: table.new() creates a 3×3 panel showing “Bullish”/“Bearish” counts and “Mitigated” percentages in real time.
//   • Alerts: alertcondition() triggers when new gaps form or are mitigated at specified percentages.
//
// Usage:
//   • Add to chart: Apply the script; enable or disable timeframes via checkboxes (Enable FVG M15, H1, H4).
//   • Configure text labels: Toggle “Text” to show or hide on‐chart price annotations.
//   • Monitor dashboard: Observe counts and fill rates to gauge market liquidity pressure.
//   • Set alerts: Enable alerts for specific levels (0%, 50%, 100%) and timeframes as needed.
//
// Potential Extensions:
//   • Customizable lookback on fill monitoring (beyond “showLast” parameter).
//   • Dynamic threshold based on ATR or volatility metrics instead of static percentage.
//   • Integration with order‐flow or volume data to refine gap significance.
//   • Expanded timeframes (D1, W, etc.) for higher‐timeframe liquidity profiling.
//
// =============================================================================
//
// © 2025. Licensed under CC BY‐NC‐SA 4.0 International.
// Feel free to reference academic works (Hasbrouck, Bouchaud, O’Hara) for theoretical context.
//
// End of Description.