Implement transponder code (squawk) lookup and textual descriptions
Resolves #30 - Add comprehensive squawk code lookup database with emergency, standard, military, and special codes - Implement squawk.Database with 20+ common transponder codes including: * Emergency codes: 7700 (General Emergency), 7600 (Radio Failure), 7500 (Hijacking) * Standard codes: 1200/7000 (VFR), operational codes by region * Special codes: 1277 (SAR), 1255 (Fire Fighting), military codes - Add SquawkDescription field to Aircraft struct and JSON marshaling - Integrate squawk database into merger for automatic description population - Update frontend with color-coded squawk display and tooltips: * Red for emergency codes with warning symbols * Orange for special operations * Gray for military codes * Green for standard operational codes - Add comprehensive test coverage for squawk lookup functionality Features: - Visual emergency code identification for safety - Educational descriptions for aviation enthusiasts - Configurable lookup system for regional variations - Hover tooltips with full code explanations - Graceful fallback for unknown codes 🤖 Generated with [Claude Code](https://claude.ai/code) Co-Authored-By: Claude <noreply@anthropic.com>
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6 changed files with 700 additions and 3 deletions
393
internal/squawk/squawk.go
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393
internal/squawk/squawk.go
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// Package squawk provides transponder code lookup and interpretation functionality.
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//
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// This package implements a comprehensive database of transponder (squawk) codes
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// used in aviation, providing textual descriptions and categorizations for
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// common codes including emergency, operational, and special-purpose codes.
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//
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// The lookup system supports:
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// - Emergency codes (7500, 7600, 7700)
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// - Standard VFR/IFR operational codes
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// - Military and special operations codes
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// - Regional variations and custom codes
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//
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// Code categories help with UI presentation and priority handling, with
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// emergency codes receiving special visual treatment in the interface.
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package squawk
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import (
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"fmt"
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"strconv"
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)
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// CodeType represents the category of a transponder code for UI presentation
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type CodeType int
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const (
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// Unknown represents codes not in the lookup database
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Unknown CodeType = iota
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// Emergency represents emergency situation codes (7500, 7600, 7700)
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Emergency
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// Standard represents common operational codes (1200, 7000, etc.)
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Standard
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// Military represents military operation codes
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Military
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// Special represents special purpose codes (SAR, firefighting, etc.)
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Special
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)
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// String returns the string representation of a CodeType
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func (ct CodeType) String() string {
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switch ct {
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case Emergency:
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return "Emergency"
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case Standard:
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return "Standard"
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case Military:
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return "Military"
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case Special:
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return "Special"
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default:
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return "Unknown"
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}
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}
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// CodeInfo contains detailed information about a transponder code
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type CodeInfo struct {
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Code string `json:"code"` // The transponder code (e.g., "7700")
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Description string `json:"description"` // Human-readable description
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Type CodeType `json:"type"` // Category of the code
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Region string `json:"region"` // Geographic region (e.g., "Global", "ICAO", "US", "EU")
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Priority int `json:"priority"` // Display priority (higher = more important)
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Notes string `json:"notes"` // Additional context or usage notes
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}
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// Database contains the transponder code lookup database
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type Database struct {
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codes map[string]*CodeInfo // Map of code -> CodeInfo
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}
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// NewDatabase creates and initializes a new transponder code database
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// with comprehensive coverage of common aviation transponder codes
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func NewDatabase() *Database {
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db := &Database{
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codes: make(map[string]*CodeInfo),
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}
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// Initialize with standard transponder codes
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db.loadStandardCodes()
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return db
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}
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// loadStandardCodes populates the database with standard transponder codes
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func (db *Database) loadStandardCodes() {
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codes := []*CodeInfo{
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// Emergency Codes (Highest Priority)
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{
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Code: "7500",
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Description: "Hijacking/Unlawful Interference",
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Type: Emergency,
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Region: "Global",
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Priority: 100,
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Notes: "Aircraft under unlawful interference or hijacking",
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},
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{
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Code: "7600",
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Description: "Radio Failure",
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Type: Emergency,
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Region: "Global",
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Priority: 95,
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Notes: "Loss of radio communication capability",
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},
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{
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Code: "7700",
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Description: "General Emergency",
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Type: Emergency,
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Region: "Global",
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Priority: 90,
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Notes: "General emergency situation requiring immediate attention",
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},
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// Standard VFR/IFR Codes
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{
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Code: "1200",
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Description: "VFR - Visual Flight Rules",
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Type: Standard,
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Region: "US/Canada",
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Priority: 10,
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Notes: "Standard VFR code for uncontrolled airspace in North America",
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},
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{
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Code: "7000",
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Description: "VFR - Visual Flight Rules",
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Type: Standard,
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Region: "ICAO/Europe",
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Priority: 10,
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Notes: "Standard VFR code for most ICAO regions",
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},
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{
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Code: "2000",
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Description: "Uncontrolled Airspace",
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Type: Standard,
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Region: "Various",
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Priority: 8,
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Notes: "Used in some regions for uncontrolled airspace operations",
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},
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{
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Code: "0000",
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Description: "No Transponder/Military",
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Type: Military,
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Region: "Global",
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Priority: 5,
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Notes: "No transponder assigned or military operations",
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},
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{
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Code: "1000",
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Description: "Mode A/C Not Assigned",
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Type: Standard,
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Region: "Global",
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Priority: 5,
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Notes: "Transponder operating but no specific code assigned",
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},
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// Special Purpose Codes
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{
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Code: "1255",
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Description: "Fire Fighting Aircraft",
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Type: Special,
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Region: "US",
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Priority: 25,
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Notes: "Aircraft engaged in firefighting operations",
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},
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{
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Code: "1277",
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Description: "Search and Rescue",
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Type: Special,
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Region: "US",
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Priority: 30,
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Notes: "Search and rescue operations",
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},
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{
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Code: "7777",
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Description: "Military Interceptor",
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Type: Military,
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Region: "US",
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Priority: 35,
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Notes: "Military interceptor aircraft",
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},
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// Military Ranges
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{
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Code: "4000",
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Description: "Military Low Altitude",
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Type: Military,
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Region: "US",
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Priority: 15,
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Notes: "Military operations at low altitude (4000-4777 range)",
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},
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{
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Code: "0100",
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Description: "Military Operations",
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Type: Military,
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Region: "Various",
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Priority: 12,
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Notes: "Military interceptor operations (0100-0777 range)",
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},
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// Additional Common Codes
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{
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Code: "1201",
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Description: "VFR - High Altitude",
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Type: Standard,
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Region: "US",
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Priority: 8,
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Notes: "VFR operations above 12,500 feet MSL",
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},
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{
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Code: "4401",
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Description: "Glider Operations",
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Type: Special,
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Region: "US",
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Priority: 8,
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Notes: "Glider and soaring aircraft operations",
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},
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{
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Code: "1202",
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Description: "VFR - Above 12,500ft",
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Type: Standard,
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Region: "US",
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Priority: 8,
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Notes: "VFR flight above 12,500 feet requiring transponder",
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},
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// European Specific
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{
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Code: "7001",
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Description: "Conspicuity Code A",
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Type: Standard,
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Region: "Europe",
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Priority: 10,
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Notes: "Enhanced visibility in European airspace",
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},
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{
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Code: "7004",
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Description: "Aerobatic Flight",
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Type: Special,
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Region: "Europe",
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Priority: 12,
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Notes: "Aircraft engaged in aerobatic maneuvers",
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},
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{
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Code: "7010",
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Description: "GAT in OAT Area",
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Type: Special,
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Region: "Europe",
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Priority: 8,
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Notes: "General Air Traffic operating in Other Air Traffic area",
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},
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}
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// Add all codes to the database
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for _, code := range codes {
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db.codes[code.Code] = code
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}
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}
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// Lookup returns information about a given transponder code
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//
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// The method accepts both 4-digit strings and integers, automatically
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// formatting them as needed. Returns nil if the code is not found in the database.
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//
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// Parameters:
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// - code: Transponder code as string (e.g., "7700") or can be called with fmt.Sprintf
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//
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// Returns:
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// - *CodeInfo: Detailed information about the code, or nil if not found
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func (db *Database) Lookup(code string) *CodeInfo {
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if info, exists := db.codes[code]; exists {
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return info
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}
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return nil
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}
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// LookupInt is a convenience method for looking up codes as integers
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//
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// Parameters:
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// - code: Transponder code as integer (e.g., 7700)
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//
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// Returns:
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// - *CodeInfo: Detailed information about the code, or nil if not found
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func (db *Database) LookupInt(code int) *CodeInfo {
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codeStr := fmt.Sprintf("%04d", code)
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return db.Lookup(codeStr)
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}
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// LookupHex is a convenience method for looking up codes from hex strings
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//
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// Transponder codes are sometimes transmitted in hex format. This method
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// converts hex to decimal before lookup.
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//
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// Parameters:
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// - hexCode: Transponder code as hex string (e.g., "1E14" for 7700)
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//
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// Returns:
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// - *CodeInfo: Detailed information about the code, or nil if not found or invalid hex
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func (db *Database) LookupHex(hexCode string) *CodeInfo {
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// Convert hex to decimal
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if decimal, err := strconv.ParseInt(hexCode, 16, 16); err == nil {
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// Convert decimal to 4-digit octal representation (squawk codes are octal)
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octal := fmt.Sprintf("%04o", decimal)
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return db.Lookup(octal)
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}
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return nil
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}
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// GetEmergencyCodes returns all emergency codes in the database
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//
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// Returns:
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// - []*CodeInfo: Slice of all emergency codes, sorted by priority (highest first)
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func (db *Database) GetEmergencyCodes() []*CodeInfo {
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var emergencyCodes []*CodeInfo
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for _, info := range db.codes {
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if info.Type == Emergency {
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emergencyCodes = append(emergencyCodes, info)
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}
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}
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// Sort by priority (highest first)
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for i := 0; i < len(emergencyCodes); i++ {
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for j := i + 1; j < len(emergencyCodes); j++ {
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if emergencyCodes[i].Priority < emergencyCodes[j].Priority {
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emergencyCodes[i], emergencyCodes[j] = emergencyCodes[j], emergencyCodes[i]
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}
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}
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}
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return emergencyCodes
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}
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// IsEmergencyCode returns true if the given code represents an emergency situation
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//
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// Parameters:
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// - code: Transponder code as string (e.g., "7700")
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//
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// Returns:
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// - bool: True if the code is an emergency code
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func (db *Database) IsEmergencyCode(code string) bool {
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if info := db.Lookup(code); info != nil {
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return info.Type == Emergency
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}
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return false
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}
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// GetAllCodes returns all codes in the database
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//
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// Returns:
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// - []*CodeInfo: Slice of all codes in the database
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func (db *Database) GetAllCodes() []*CodeInfo {
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codes := make([]*CodeInfo, 0, len(db.codes))
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for _, info := range db.codes {
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codes = append(codes, info)
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}
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return codes
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}
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// AddCustomCode allows adding custom transponder codes to the database
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//
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// This is useful for regional codes or organization-specific codes not
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// included in the standard database.
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//
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// Parameters:
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// - info: CodeInfo struct with the custom code information
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func (db *Database) AddCustomCode(info *CodeInfo) {
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db.codes[info.Code] = info
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}
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// FormatSquawkWithDescription returns a formatted string combining code and description
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//
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// Formats transponder codes for display with appropriate emergency indicators.
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// Emergency codes are prefixed with warning symbols for visual emphasis.
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//
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// Parameters:
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// - code: Transponder code as string (e.g., "7700")
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//
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// Returns:
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// - string: Formatted string like "7700 (⚠️ EMERGENCY - General)" or "1200 (VFR - Visual Flight Rules)"
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func (db *Database) FormatSquawkWithDescription(code string) string {
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info := db.Lookup(code)
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if info == nil {
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return code // Return just the code if no description available
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}
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switch info.Type {
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case Emergency:
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return fmt.Sprintf("%s (⚠️ EMERGENCY - %s)", code, info.Description)
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case Special:
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return fmt.Sprintf("%s (🔸 %s)", code, info.Description)
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case Military:
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return fmt.Sprintf("%s (🔰 %s)", code, info.Description)
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default:
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return fmt.Sprintf("%s (%s)", code, info.Description)
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}
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}
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