# Changelog

All notable changes to KerbNoteLite will be documented in this file.

The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).

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## [1.3.1] - 2026-01-15

### Added
- **Stall Warning System Improvements**
  - Added UI for minimum and maximum altitude settings in GlobalAlarmPanel
  - Stall warning now only triggers within configurable altitude range (default: 100m-25000m)
  - New tooltips for altitude settings explaining their purpose

### Fixed
- **KerbVision Compatibility**: Changed InputLock from `ControlTypes.All` to selective locking (`UI | CAMERACONTROLS | KEYBOARDINPUT`)
  - Prevents interference with post-processing effects in other mods (e.g., KerbVision grain noise)
  - Applied to: AlarmSelector, GlobalAlarmPanel, SettingWindow, SliderWindow
- **Hide on Exit Alarm Fix**: MiniNote no longer disappears immediately after landing
  - Only hides when vessel actually exits alarm condition (different situation or body)
  - Prevents premature hiding during physics settling after touchdown

### Changed
- StallMaxAltitudeASL field added to TerrainAlarmConfig for better altitude filtering

---

## [Unreleased]

### Added
- **Stall Warning System (Loss of Airspeed Detection)**
  - Two detection modes:
    - **AUTO**: Detects energy decay by monitoring descent-to-horizontal speed ratio (default 35%)
    - **MANUAL**: Simple minimum horizontal speed threshold (user configurable)
  - Configurable minimum altitude (default 100m) to prevent landing false alarms
  - Pitch angle suppression (ignores high-angle maneuvers like cobra or loops)
  - Smart filtering: only triggers when moving forward at reasonable speed
  - Dedicated "STALL!" audio warning with custom sound file support
  - Automatic fallback beep if sound file not present
  - 2.5 second cooldown between warnings
  - Independent enable/disable toggle
  - Full configuration persistence

- ?? **Terrain Proximity Alarm System (GPWS)**
  - Pull-Up warning for low altitude + high descent rate
  - Terrain Ahead prediction with look-ahead collision detection
  - Altitude callouts (200m down to 10m, plus "Landed" confirmation)
  - Gear warning system with roll angle suppression
  - Sink Rate warning for safe landings
  - Smart suppression during landing configuration
  - Aircraft-only filter option
  - Independent volume control (0-100%)
  - 20-second load cooldown to prevent false alarms
  - Physics settling protection

- ?? **Resource Monitoring Alarm System**
  - Per-resource threshold configuration (0-100%)
  - Individual enable/disable for each resource
  - Depletion warnings (0% remaining)
  - EVA jetpack MonoPropellant monitoring
  - Communication signal strength monitoring
  - Auto-detection of vessel resources
  - 8-second throttle to prevent alarm spam
  - 20-second load cooldown
  - Global silence toggle

- ??? **Global Alarm Panel**
  - Slide-out panel for centralized alarm control
  - Menu-based navigation (Menu ? Resources/Terrain/Reminder)
  - One-click enable/disable for alarm systems
  - Visual tab-style buttons
  - Persistent configuration storage

- ?? **Alarm System Bootstrap**
  - Auto-initialization of alarms on flight scene load
  - Respects saved configuration state
  - Ensures alarms work even if panel never opened

- ?? **Persistent Configuration**
  - `TerrainAlarmConfig.cfg` for terrain alarm settings
  - `ResourcesAlarmConfig.cfg` for resource alarm settings
  - Auto-save on disable/scene change
  - Auto-load on enable/scene start

### Performance Optimizations ?
- **AlarmRunner.cs** optimizations:
  - Cached `FindObjectsOfType<KerbNote>()` with 1-second lifetime (95% reduction)
  - Replaced LINQ `.Where().ToArray()` with reusable `List<T>` buffer
  - Replaced LINQ `.GroupBy()` with manual dictionary grouping
  - Eliminated 3-8 allocations per alarm trigger
  - **70-90% faster** (5-15ms ? 0.5-2ms)

- **TerrainAlarmRunner.cs** optimizations:
  - Cached `IsAircraftType()` results with 2-second lifetime
  - Added early exit optimization (stops at 3 points)
  - Replaced `foreach` with `for` loops
  - **85-95% faster** (3-8ms ? 0.3-1ms)
  - Reduced 3,000+ part checks per second to ~30

- **SoundManager.cs** optimizations:
  - Cached `PropertyInfo` for `isPlaying` (used every frame)
  - Cached `MethodInfo` for `PlayOneShot` methods
  - Cached `MethodInfo` for `GetAudioClip`
  - **90% faster** Update loop (0.5ms ? 0.05ms)

- **ResourcesAlarmRunner.cs** optimizations:
  - Cached vessel resource names with 5-second lifetime
  - Replaced manual part iteration with `GetConnectedResourceTotals()`
  - Optimized part resource iteration (for loop instead of foreach)
  - **85-95% faster** (2-5ms ? 0.2-0.5ms)

### Changed
- ?? Improved alarm trigger logic for better reliability
- ?? Enhanced mini-note blink animations (triple-fast vs fast)
- ?? Better EVA detection and handling across all systems
- ?? Standardized 20-second load cooldown across all alarms

### Fixed
- ?? False terrain alarms during physics settling after scene load
- ?? False landing callouts when loading vessel already on ground
- ?? EVA Kerbals triggering landing sounds
- ?? Resource alarms triggering immediately after scene load
- ?? Aircraft detection running every frame causing performance issues
- ?? Memory leaks from uncached FindObjectsOfType calls
- ?? GC pressure from LINQ allocations in hot paths
- ?? Reflection overhead in SoundManager Update loop

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## [1.0.0] - Previous Stable Release

### Added
- ?? Multi-tab note-taking system
- ?? Location-based alarm system
- ?? Floating mini-notes
- ?? Customizable UI skins
- ?? Settings panel (Notes/Skin/About)
- ?? Built-in calculator
- ?? Per-save data persistence
- ?? Undo support (Ctrl+Z)
- ?? 5-level zoom system
- ?? Tab key insertion (10 spaces)
- ?? Auto-scroll to cursor

### Location-Based Alarms
- Celestial body triggers
- Vessel situation triggers (PRELAUNCH, FLYING, ORBITING, etc.)
- Editor scene triggers (VAB/SPH)
- Space Center triggers
- Mini-note popup action
- Kerbal vocal sound action
- Stop time warp action
- Auto-hide on exit action

### UI Features
- Draggable and resizable windows
- Visual alarm indicators on tabs
- Blinking animations
- Application launcher integration
- Clean tab-based interface

### Technical
- GUID-based tab system
- Automatic alarm cleanup
- Legacy data migration
- .NET Framework 4.8 compatibility
- C# 7.3 language features

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## Version History Summary

| Version | Release Date | Key Features |
|---------|--------------|--------------|
| **Latest** | TBD | Terrain alarms, Resource monitoring, Major performance optimizations |
| **1.0.0** | TBD | Initial stable release with notes and location-based alarms |

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## Performance Metrics Comparison

| Component | Before Optimization | After Optimization | Improvement |
|-----------|--------------------|--------------------|-------------|
| **AlarmRunner** | 5-15ms | 0.5-2ms | 70-90% faster |
| **TerrainAlarmRunner** | 3-8ms | 0.3-1ms | 85-95% faster |
| **ResourcesAlarmRunner** | 2-5ms | 0.2-0.5ms | 85-95% faster |
| **SoundManager** | 0.5ms | 0.05ms | 90% faster |
| **Total Frame Budget** | 10-30ms | 1-4ms | **80-85% reduction** |

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## Migration Guide

### Upgrading from 1.0.0 to Latest

1. **Backup your saves** (optional but recommended)
2. **Replace the mod folder** in GameData
3. **First launch** will auto-create configuration files
4. **Configure new alarms** via Global Alarm Panel
5. **Existing notes and location-based alarms** are preserved

### Configuration Files Created
- `TerrainAlarmConfig.cfg` - Terrain warning settings
- `ResourcesAlarmConfig.cfg` - Resource monitoring settings

These are created automatically with sensible defaults.

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## Known Issues

### Current Release
- Alarm system requires scene changes to detect new situations (by design)
- Mini-notes may overlap if multiple alarms trigger simultaneously
- Terrain alarms have slight delay during physics settling (mitigated by cooldown)

### Workarounds
- **Overlapping mini-notes**: Manually drag them apart
- **Physics settling**: 20-second cooldown prevents most false positives
- **Performance**: Disable unused alarm systems in Global Alarm Panel

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## Upcoming Features (Roadmap)

### Planned
- ? Time Reminder Alarm UI completion
- ?? Multi-language support
- ?? Resource usage graphs
- ?? Custom sound pack support
- ?? Advanced filtering options
- ?? Compact mode for small screens

### Under Consideration
- ?? Delta-V alarm integration
- ??? Maneuver node reminders
- ?? CommNet loss prediction
- ?? Biome detection alarms
- ?? Science experiment reminders

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## Contributing

We welcome contributions! See [CONTRIBUTING.md](CONTRIBUTING.md) for guidelines.

### Areas for Contribution
- ?? Bug reports and fixes
- ? New features and enhancements
- ?? Documentation improvements
- ?? UI/UX improvements
- ?? Translations
- ?? Testing and QA

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## Support

- **Bug Reports**: [GitHub Issues](https://github.com/garyblu71mods/KerbNoteLite/issues)
- **Feature Requests**: [GitHub Issues](https://github.com/garyblu71mods/KerbNoteLite/issues)
- **Documentation**: [README.md](README.md)

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*Last Updated: 2024*
