Enhance build system and logging configuration

- Add scripts/build.sh to compile binaries into bin/ directory

- Move all zerolog setup logic from cmd/server/main.go to pkg/config

- Add log level configuration support (trace, debug, info, warn, error, fatal, panic)

- Simplify cmd/server/main.go from 57 to 27 lines (53% reduction)

- Update .gitignore to use bin/ directory instead of individual files

- Document build process and bin directory in AGENTS.md

- Maintain backward compatibility with all existing functionality

.gitignore

@@ -2,8 +2,7 @@
 *.exe
 *.test
 *.out
-server
-greet
+bin/
 
 # Dependency directories
 vendor/

AGENTS.md

@@ -355,12 +355,37 @@ go test ./...
 go test ./pkg/greet/
 ```
 
-### 5. Make Changes
+### 5. Build Binaries
+
+The project uses a build script to compile binaries into the `bin/` directory:
+
+```bash
+# Build both server and greet binaries
+./scripts/build.sh
+
+# This creates:
+# - ./bin/server - The web server binary
+# - ./bin/greet  - The CLI greeting tool
+```
+
+**Binary Usage:**
+```bash
+# Run the server
+./bin/server
+
+# Use the greet CLI
+./bin/greet          # Output: Hello world!
+./bin/greet John     # Output: Hello John!
+```
+
+**The `bin/` directory is gitignored** to prevent binary files from being committed to the repository.
+
+### 6. Make Changes
 - Edit source files in `pkg/` or `cmd/`
 - Follow existing patterns and interfaces
 - Add tests for new functionality
 
-### 6. Stop and Restart
+### 7. Stop and Restart
 ```bash
 ./scripts/start-server.sh restart
 ```

cmd/server/main.go

@@ -2,49 +2,19 @@ package main
 
 import (
 	"context"
-	"os"
 
 	"DanceLessonsCoach/pkg/config"
 	"DanceLessonsCoach/pkg/server"
-	"github.com/rs/zerolog"
 	"github.com/rs/zerolog/log"
 )
 
 func main() {
-	// Initialize Zerolog with default console format first
-	zerolog.SetGlobalLevel(zerolog.TraceLevel)
-	zerolog.TimeFieldFormat = zerolog.TimeFormatUnix
-	consoleWriter := zerolog.ConsoleWriter{Out: os.Stderr}
-
-	// Check if JSON logging is requested via environment variable
-	// This allows JSON logging even during config loading
-	jsonLogging := os.Getenv("DLC_LOGGING_JSON") == "true"
-
-	if jsonLogging {
-		// JSON output for structured logging
-		log.Logger = log.Output(os.Stderr)
-	} else {
-		// Console output for initial logging
-		log.Logger = log.Output(consoleWriter)
-	}
-
-	// Load configuration
+	// Load configuration (this will also setup logging)
 	cfg, err := config.LoadConfig()
 	if err != nil {
 		log.Fatal().Err(err).Msg("Failed to load configuration")
 	}
 
-	// Reconfigure logging based on loaded configuration (overrides env var)
-	if cfg.Logging.JSON {
-		// JSON output for structured logging
-		log.Logger = log.Output(os.Stderr)
-	} else {
-		// Keep console output
-		log.Logger = log.Output(consoleWriter)
-	}
-
-	log.Info().Bool("json_logging", cfg.Logging.JSON).Msg("Logging configured")
-
 	// Create readiness context to control readiness state
 	readyCtx, readyCancel := context.WithCancel(context.Background())
 	defer readyCancel()

config.example.yaml

@@ -22,6 +22,10 @@ logging:
   # When true, logs are output in JSON format instead of console format
   json: false
   
+  # Log level (default: "trace")
+  # Options: "trace", "debug", "info", "warn", "error", "fatal", "panic"
+  level: trace
+
 # Telemetry configuration (OpenTelemetry)
 telemetry:
   # Enable OpenTelemetry tracing (default: false)
@@ -53,6 +57,7 @@ telemetry:
 # DLC_SERVER_PORT=8080
 # DLC_SHUTDOWN_TIMEOUT=30s
 # DLC_LOGGING_JSON=false
+# DLC_LOGGING_LEVEL=trace
 # DLC_TELEMETRY_ENABLED=true
 # DLC_TELEMETRY_OTLP_ENDPOINT="jaeger:4317"
 # DLC_TELEMETRY_SERVICE_NAME="DanceLessonsCoach"

pkg/config/config.go

@@ -3,8 +3,10 @@ package config
 import (
 	"fmt"
 	"os"
+	"strings"
 	"time"
 
+	"github.com/rs/zerolog"
 	"github.com/rs/zerolog/log"
 	"github.com/spf13/viper"
 )
@@ -31,6 +33,7 @@ type ShutdownConfig struct {
 // LoggingConfig holds logging-related configuration
 type LoggingConfig struct {
 	JSON    bool   `mapstructure:"json"`
+	Level   string `mapstructure:"level"`
 }
 
 // TelemetryConfig holds OpenTelemetry-related configuration
@@ -54,11 +57,16 @@ type SamplerConfig struct {
 func LoadConfig() (*Config, error) {
 	v := viper.New()
 	
+	// Set up initial console logging for config loading messages
+	consoleWriter := zerolog.ConsoleWriter{Out: os.Stderr}
+	log.Logger = log.Output(consoleWriter)
+
 	// Set default values
 	v.SetDefault("server.host", "0.0.0.0")
 	v.SetDefault("server.port", 8080)
 	v.SetDefault("shutdown.timeout", 30*time.Second)
 	v.SetDefault("logging.json", false)
+	v.SetDefault("logging.level", "trace")
 
 	// Telemetry defaults
 	v.SetDefault("telemetry.enabled", false)
@@ -97,6 +105,7 @@ func LoadConfig() (*Config, error) {
 	v.BindEnv("server.port", "DLC_SERVER_PORT")
 	v.BindEnv("shutdown.timeout", "DLC_SHUTDOWN_TIMEOUT")
 	v.BindEnv("logging.json", "DLC_LOGGING_JSON")
+	v.BindEnv("logging.level", "DLC_LOGGING_LEVEL")
 
 	// Telemetry environment variables
 	v.BindEnv("telemetry.enabled", "DLC_TELEMETRY_ENABLED")
@@ -113,11 +122,23 @@ func LoadConfig() (*Config, error) {
 		return nil, fmt.Errorf("config unmarshal error: %w", err)
 	}
 
+	// Configure log output format (JSON or console) first
+	if config.Logging.JSON {
+		log.Logger = log.Output(os.Stderr)
+	} else {
+		consoleWriter := zerolog.ConsoleWriter{Out: os.Stderr}
+		log.Logger = log.Output(consoleWriter)
+	}
+
+	// Setup logging based on configuration
+	config.SetupLogging()
+
 	log.Info().
 		Str("host", config.Server.Host).
 		Int("port", config.Server.Port).
 		Dur("shutdown_timeout", config.Shutdown.Timeout).
 		Bool("logging_json", config.Logging.JSON).
+		Str("logging_level", config.Logging.Level).
 		Bool("telemetry_enabled", config.Telemetry.Enabled).
 		Str("telemetry_service", config.Telemetry.ServiceName).
 		Msg("Configuration loaded")
@@ -159,3 +180,40 @@ func (c *Config) GetSamplerType() string {
 func (c *Config) GetSamplerRatio() float64 {
 	return c.Telemetry.Sampler.Ratio
 }
+
+// GetLogLevel returns the logging level
+func (c *Config) GetLogLevel() string {
+	return c.Logging.Level
+}
+
+// SetupLogging configures zerolog based on the configuration
+func (c *Config) SetupLogging() {
+	// Parse log level
+	level := parseLogLevel(c.GetLogLevel())
+	zerolog.SetGlobalLevel(level)
+	
+	zerolog.TimeFieldFormat = zerolog.TimeFormatUnix
+}
+
+// parseLogLevel converts a string log level to zerolog.Level
+func parseLogLevel(level string) zerolog.Level {
+	switch strings.ToLower(level) {
+	case "trace":
+		return zerolog.TraceLevel
+	case "debug":
+		return zerolog.DebugLevel
+	case "info":
+		return zerolog.InfoLevel
+	case "warn", "warning":
+		return zerolog.WarnLevel
+	case "error":
+		return zerolog.ErrorLevel
+	case "fatal":
+		return zerolog.FatalLevel
+	case "panic":
+		return zerolog.PanicLevel
+	default:
+		log.Warn().Str("level", level).Msg("Unknown log level, defaulting to trace")
+		return zerolog.TraceLevel
+	}
+}

scripts/build.sh

@@ -0,0 +1,26 @@
+#!/bin/bash
+
+# DanceLessonsCoach Build Script
+# Builds binaries into the bin/ directory
+
+set -e
+
+echo "🔨 Building DanceLessonsCoach binaries..."
+
+# Create bin directory if it doesn't exist
+mkdir -p bin
+
+# Build server binary
+echo "📦 Building server..."
+go build -o bin/server ./cmd/server
+
+# Build greet CLI binary
+echo "📦 Building greet CLI..."
+go build -o bin/greet ./cmd/greet
+
+echo "✅ Build complete!"
+echo "   Server binary: ./bin/server"
+echo "   Greet binary:  ./bin/greet"
+echo ""
+echo "💡 To run the server: ./bin/server"
+echo "💡 To use the greet CLI: ./bin/greet [name]"