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package satp

import (
	"bytes"
	"testing"
)

func TestKDRoleMarshalText(t *testing.T) {
	testvectors := []struct {
		role KDRole
		out  []byte
	}{
		{RoleLeft, []byte("left")},
		{RoleRight, []byte("right")},
		{17, []byte("unknown")},
	}

	for _, vector := range testvectors {
		out, err := vector.role.MarshalText()
		if err != nil {
			t.Fatal("unexpected error:", err)
		}
		if !bytes.Equal(out, vector.out) {
			t.Fatalf("role name should be %q but is %q", string(vector.out), string(out))
		}
	}
}

func TestKDRoleUnmarshalText(t *testing.T) {
	testvectors := []struct {
		role  KDRole
		in    []byte
		valid bool
	}{
		{RoleLeft, []byte(""), false},
		{RoleRight, []byte("foo"), false},
		{RoleLeft, []byte("left-ish"), false},
		{RoleLeft, []byte("servers"), false},
		{RoleRight, []byte("eve"), false},

		{RoleLeft, []byte("left"), true},
		{RoleRight, []byte("right"), true},
		{RoleLeft, []byte("server"), true},
		{RoleRight, []byte("client"), true},
		{RoleLeft, []byte("alice"), true},
		{RoleRight, []byte("bob"), true},
	}

	for _, vector := range testvectors {
		var r KDRole
		err := r.UnmarshalText(vector.in)
		if vector.valid {
			if err != nil {
				t.Fatal("unexpected error:", err)
			}
			if r != vector.role {
				t.Fatalf("unmarshalling %q returned %s but should be %s", string(vector.in), r, vector.role)
			}
		} else {
			if err == nil {
				t.Fatalf("unmarshalling %q should give and error", string(vector.in))
			}
		}
	}
}

func TestKDGetLabel(t *testing.T) {
	testvectors := []struct {
		role  KDRole
		dir   Direction
		usage KeyUsage
		label uint32
	}{
		{RoleLeft, Outbound, UsageEncryptKey, 0x356A192B},
		{RoleRight, Outbound, UsageEncryptKey, 0xDA4B9237},
		{RoleLeft, Outbound, UsageEncryptSalt, 0x77DE68DA},
		{RoleRight, Outbound, UsageEncryptSalt, 0x1B645389},
		{RoleLeft, Outbound, UsageAuthKey, 0xAC3478D6},
		{RoleRight, Outbound, UsageAuthKey, 0xC1DFD96E},

		{RoleLeft, Inbound, UsageEncryptKey, 0xDA4B9237},
		{RoleRight, Inbound, UsageEncryptKey, 0x356A192B},
		{RoleLeft, Inbound, UsageEncryptSalt, 0x1B645389},
		{RoleRight, Inbound, UsageEncryptSalt, 0x77DE68DA},
		{RoleLeft, Inbound, UsageAuthKey, 0xC1DFD96E},
		{RoleRight, Inbound, UsageAuthKey, 0xAC3478D6},
	}

	for _, vector := range testvectors {
		label := getKDLabel(vector.role, vector.dir, vector.usage)
		if label != vector.label {
			t.Fatalf("returned label is invalid, is: 0x%08X, should be 0x%08X", label, vector.label)
		}
	}
}