configure json logger

internal/app/options.go

@@ -2,8 +2,10 @@ package app
 
 import (
 	"context"
+	"io"
 	"log/slog"
 	"os"
+	"path/filepath"
 
 	"github.com/LazyBachelor/LazyPM/internal/models"
 )
@@ -23,15 +25,43 @@ type AppBuilder struct {
 }
 
 func defaultBuilder(ctx context.Context, config Config) *AppBuilder {
+	lifecycle := NewLifecycle()
+	logger := newDefaultLogger(config, lifecycle)
+
 	return &AppBuilder{
 		ctx:         ctx,
 		config:      config,
-		lifecycle:   NewLifecycle(),
+		lifecycle:   lifecycle,
 		initializer: &InteractiveInitializer{},
-		logger:      slog.New(slog.NewJSONHandler(os.Stdout, nil)),
+		logger:      logger,
 	}
 }
 
+func newDefaultLogger(config Config, lifecycle *Lifecycle) *slog.Logger {
+	statsDir := filepath.Dir(config.StatisticsStoragePath)
+	if statsDir == "" {
+		statsDir = "."
+	}
+
+	if err := os.MkdirAll(statsDir, 0o755); err != nil {
+		return slog.New(slog.NewJSONHandler(io.Discard, nil))
+	}
+
+	logPath := filepath.Join(statsDir, "app-logs.jsonl")
+	logFile, err := os.OpenFile(logPath, os.O_APPEND|os.O_CREATE|os.O_WRONLY, 0o644)
+	if err != nil {
+		return slog.New(slog.NewJSONHandler(io.Discard, nil))
+	}
+
+	if lifecycle != nil {
+		lifecycle.Add(func() {
+			_ = logFile.Close()
+		})
+	}
+
+	return slog.New(slog.NewJSONHandler(logFile, &slog.HandlerOptions{}))
+}
+
 func WithLogger(logger *slog.Logger) Option {
 	return func(b *AppBuilder) error {
 		b.logger = logger