package config

import (
	"os"
	"path/filepath"
	"testing"
)

func TestServersFileRoundTrip(t *testing.T) {
	cfg := &Config{
		Active: "b",
		Profiles: []Profile{
			{Name: "a", Protocol: ProtocolNaive, Proxy: "https://u:p@a.example"},
			{Name: "b", Protocol: ProtocolHysteria2, Proxy: "hy2://tok@b.example:443"},
		},
		SystemProxy:     true,
		ConnectOnLaunch: true,
		SubscriptionURL: "https://sub.example/x",
	}
	dir := t.TempDir()
	path := filepath.Join(dir, "servers.json")
	n, err := WriteServersFile(path, cfg)
	if err != nil {
		t.Fatal(err)
	}
	if n != 2 {
		t.Fatalf("exported %d, want 2", n)
	}

	other := &Config{
		Active:            "old",
		SystemProxy:       false,
		ConnectOnLaunch:   false,
		SubscriptionURL:   "https://keep.example",
		SubscriptionNames: []string{"old"},
		Profiles: []Profile{
			{Name: "old", Protocol: ProtocolNaive, Proxy: "https://old"},
		},
	}
	doc, err := ReadServersFile(path)
	if err != nil {
		t.Fatal(err)
	}
	if err := other.ApplyServersReplace(doc); err != nil {
		t.Fatal(err)
	}
	if other.SubscriptionURL != "https://keep.example" {
		t.Fatalf("prefs changed: %q", other.SubscriptionURL)
	}
	if other.SystemProxy {
		t.Fatal("system_proxy should stay false")
	}
	if len(other.Profiles) != 2 || other.Active != "b" {
		t.Fatalf("got active=%q profiles=%+v", other.Active, other.Profiles)
	}
	if other.SubscriptionNames != nil {
		t.Fatalf("subscription_names should clear, got %v", other.SubscriptionNames)
	}
}

func TestParseServersFileBareArray(t *testing.T) {
	doc, err := ParseServersFile([]byte(`[{"name":"x","protocol":"naive","proxy":"https://x"}]`))
	if err != nil {
		t.Fatal(err)
	}
	if len(doc.Profiles) != 1 || doc.Active != "x" {
		t.Fatalf("unexpected: %+v", doc)
	}
}

func TestParseServersFileEmptyRejected(t *testing.T) {
	if _, err := ParseServersFile([]byte(`{"profiles":[]}`)); err == nil {
		t.Fatal("expected error")
	}
	if _, err := ParseServersFile([]byte(`[]`)); err == nil {
		t.Fatal("expected error")
	}
}

func TestWriteServersFilePermissions(t *testing.T) {
	cfg := &Config{
		Active:   "a",
		Profiles: []Profile{{Name: "a", Protocol: ProtocolNaive}},
	}
	path := filepath.Join(t.TempDir(), "out.json")
	if _, err := WriteServersFile(path, cfg); err != nil {
		t.Fatal(err)
	}
	st, err := os.Stat(path)
	if err != nil {
		t.Fatal(err)
	}
	if st.Size() == 0 {
		t.Fatal("empty file")
	}
}