package simplelog

import (
	"log/slog"
	"testing"
	"time"
)

// TestJSONHandlerDeadlock verifies that JSONHandler.Handle does not deadlock
// when the default slog handler routes log.Println back through slog.
// On the unfixed code this test will hang (deadlock); with the fix it completes.
func TestJSONHandlerDeadlock(t *testing.T) {
	handler := NewJSONHandler()

	// Set our handler as the default so log.Println routes through slog
	logger := slog.New(handler)
	slog.SetDefault(logger)

	done := make(chan struct{})
	go func() {
		// This call deadlocks on unfixed code because Handle() calls
		// log.Println() which re-enters slog → Handle() → log.Println() …
		slog.Info("test message")
		close(done)
	}()

	select {
	case <-done:
		// success
	case <-time.After(5 * time.Second):
		t.Fatal("JSONHandler.Handle deadlocked: timed out after 5 seconds")
	}
}