package platform

import (
	"os"
	"runtime"
	"strconv"
	"testing"
)

func TestGetEffectiveUID(t *testing.T) {
	if runtime.GOOS == "windows" {
		if got := GetEffectiveUID(); got != -1 {
			t.Errorf("GetEffectiveUID() on Windows = %d, want -1", got)
		}
		return
	}
	if got, want := GetEffectiveUID(), os.Geteuid(); got != want {
		t.Errorf("GetEffectiveUID() = %d, want os.Geteuid() %d", got, want)
	}
}

func TestIsRoot(t *testing.T) {
	if runtime.GOOS == "windows" {
		if IsRoot() {
			t.Error("IsRoot() on Windows = true, want false")
		}
		return
	}
	if got, want := IsRoot(), os.Geteuid() == 0; got != want {
		t.Errorf("IsRoot() = %v, want %v", got, want)
	}
}

func TestGetCurrentUser(t *testing.T) {
	if runtime.GOOS == "windows" {
		username, uid, err := GetCurrentUser()
		if username != "" || uid != "" || err != nil {
			t.Errorf("GetCurrentUser() on Windows = (%q, %q, %v), want empty", username, uid, err)
		}
		return
	}

	username, uid, err := GetCurrentUser()
	if err != nil {
		t.Fatalf("GetCurrentUser() error = %v", err)
	}
	if username == "" {
		t.Error("GetCurrentUser() returned empty username")
	}
	if _, err := strconv.Atoi(uid); err != nil {
		t.Errorf("GetCurrentUser() uid = %q, want numeric", uid)
	}
}

func TestGetHomeDirectory(t *testing.T) {
	want, err := os.UserHomeDir()
	if err != nil {
		t.Skip("no home directory in this environment")
	}
	if got := GetHomeDirectory(); got != want {
		t.Errorf("GetHomeDirectory() = %q, want %q", got, want)
	}
}

func TestParseUID(t *testing.T) {
	tests := []struct {
		input   string
		want    int
		wantErr bool
	}{
		{"0", 0, false},
		{"1000", 1000, false},
		{"-1", -1, false},
		{"abc", 0, true},
		{"", 0, true},
		{"10.5", 0, true},
	}

	for _, tt := range tests {
		t.Run(tt.input, func(t *testing.T) {
			got, err := ParseUID(tt.input)
			if (err != nil) != tt.wantErr {
				t.Errorf("ParseUID(%q) error = %v, wantErr %v", tt.input, err, tt.wantErr)
				return
			}
			if !tt.wantErr && got != tt.want {
				t.Errorf("ParseUID(%q) = %d, want %d", tt.input, got, tt.want)
			}
		})
	}
}