// SPDX-License-Identifier: MIT

package engine

import (
	"context"
	"os"
	"path/filepath"
	"strings"
	"testing"

	"prx/internal/config"
	"prx/internal/execx"
)

func TestIsActive(t *testing.T) {
	active := &execx.Fake{Handler: func(_ string, _ []string, _ []byte) (execx.Result, error) {
		return execx.Result{Stdout: []byte("active\n")}, nil
	}}
	got, err := IsActive(context.Background(), active, "sing-box")
	if err != nil || !got {
		t.Fatalf("IsActive = %v, %v", got, err)
	}

	inactive := &execx.Fake{Handler: func(_ string, _ []string, _ []byte) (execx.Result, error) {
		return execx.Result{Stdout: []byte("inactive\n"), Code: 3}, &execx.ExitError{Name: "systemctl", Code: 3, Stderr: []byte("inactive")}
	}}
	got, err = IsActive(context.Background(), inactive, "sing-box")
	if err != nil || got {
		t.Fatalf("IsActive(inactive) = %v, %v", got, err)
	}
}

func TestValidateConfig(t *testing.T) {
	dir := t.TempDir()
	withTun := filepath.Join(dir, "with-tun.json")
	if err := os.WriteFile(withTun, []byte(`{"inbounds":[{"type":"tun"}]}`), 0o644); err != nil {
		t.Fatal(err)
	}
	warnings, err := ValidateConfig(withTun)
	if err != nil {
		t.Fatalf("ValidateConfig: %v", err)
	}
	if len(warnings) != 0 {
		t.Fatalf("unexpected warnings: %v", warnings)
	}

	noTun := filepath.Join(dir, "no-tun.json")
	if err := os.WriteFile(noTun, []byte(`{"inbounds":[{"type":"mixed"}]}`), 0o644); err != nil {
		t.Fatal(err)
	}
	warnings, err = ValidateConfig(noTun)
	if err != nil {
		t.Fatalf("ValidateConfig: %v", err)
	}
	if len(warnings) == 0 {
		t.Fatal("expected a warning for missing tun inbound")
	}
}

func TestValidateConfigWarnsOnAutoRouteDisabled(t *testing.T) {
	path := filepath.Join(t.TempDir(), "auto-route-off.json")
	body := `{"inbounds":[{"type":"tun"}],"route":{"auto_route":false}}`
	if err := os.WriteFile(path, []byte(body), 0o644); err != nil {
		t.Fatal(err)
	}
	warnings, err := ValidateConfig(path)
	if err != nil {
		t.Fatalf("ValidateConfig: %v", err)
	}
	found := false
	for _, w := range warnings {
		if strings.Contains(w, "auto_route") {
			found = true
		}
	}
	if !found {
		t.Fatalf("expected an auto_route warning, got %v", warnings)
	}
}

func TestTemplateContainsTunAndBypass(t *testing.T) {
	cfg := config.Default()
	body, err := Template(cfg)
	if err != nil {
		t.Fatalf("Template: %v", err)
	}
	s := string(body)
	for _, needle := range []string{`"type": "tun"`, `"auto_route": true`, "10.0.0.0/8", "192.168.0.0/16"} {
		if !strings.Contains(s, needle) {
			t.Errorf("template missing %q", needle)
		}
	}
}