package agent

import (
	"context"
	"testing"
)

func TestNewReturnsClaudeBackend(t *testing.T) {
	t.Parallel()
	b, err := New("claude", Config{ExecutablePath: "/nonexistent/claude"})
	if err != nil {
		t.Fatalf("New(claude) error: %v", err)
	}
	if _, ok := b.(*claudeBackend); !ok {
		t.Fatalf("expected *claudeBackend, got %T", b)
	}
}

func TestNewReturnsCodexBackend(t *testing.T) {
	t.Parallel()
	b, err := New("codex", Config{ExecutablePath: "/nonexistent/codex"})
	if err != nil {
		t.Fatalf("New(codex) error: %v", err)
	}
	if _, ok := b.(*codexBackend); !ok {
		t.Fatalf("expected *codexBackend, got %T", b)
	}
}

func TestNewRejectsUnknownType(t *testing.T) {
	t.Parallel()
	_, err := New("gpt", Config{})
	if err == nil {
		t.Fatal("expected error for unknown agent type")
	}
}

func TestNewDefaultsLogger(t *testing.T) {
	t.Parallel()
	b, _ := New("claude", Config{})
	cb := b.(*claudeBackend)
	if cb.cfg.Logger == nil {
		t.Fatal("expected non-nil logger")
	}
}

func TestDetectVersionFailsForMissingBinary(t *testing.T) {
	t.Parallel()
	_, err := DetectVersion(context.Background(), "/nonexistent/binary")
	if err == nil {
		t.Fatal("expected error for missing binary")
	}
}