// Copyright 2009 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

package asn1

import (
	"bytes"
	"encoding/hex"
	"testing"
	"time"
)

type intStruct struct {
	A int
}

type twoIntStruct struct {
	A int
	B int
}

type nestedStruct struct {
	A intStruct
}

type rawContentsStruct struct {
	Raw RawContent
	A   int
}

type implicitTagTest struct {
	A int `asn1:"implicit,tag:5"`
}

type explicitTagTest struct {
	A int `asn1:"explicit,tag:5"`
}

type ia5StringTest struct {
	A string `asn1:"ia5"`
}

type printableStringTest struct {
	A string `asn1:"printable"`
}

type optionalRawValueTest struct {
	A RawValue `asn1:"optional"`
}

type testSET []int

func setPST(t *time.Time) *time.Time {
	t.ZoneOffset = -28800
	return t
}

type marshalTest struct {
	in  interface{}
	out string // hex encoded
}

var marshalTests = []marshalTest{
	{10, "02010a"},
	{127, "02017f"},
	{128, "02020080"},
	{-128, "020180"},
	{-129, "0202ff7f"},
	{intStruct{64}, "3003020140"},
	{twoIntStruct{64, 65}, "3006020140020141"},
	{nestedStruct{intStruct{127}}, "3005300302017f"},
	{[]byte{1, 2, 3}, "0403010203"},
	{implicitTagTest{64}, "3003850140"},
	{explicitTagTest{64}, "3005a503020140"},
	{time.SecondsToUTC(0), "170d3730303130313030303030305a"},
	{time.SecondsToUTC(1258325776), "170d3039313131353232353631365a"},
	{setPST(time.SecondsToUTC(1258325776)), "17113039313131353232353631362d30383030"},
	{BitString{[]byte{0x80}, 1}, "03020780"},
	{BitString{[]byte{0x81, 0xf0}, 12}, "03030481f0"},
	{ObjectIdentifier([]int{1, 2, 3, 4}), "06032a0304"},
	{ObjectIdentifier([]int{1, 2, 840, 133549, 1, 1, 5}), "06092a864888932d010105"},
	{"test", "130474657374"},
	{
		"" +
			"xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx" +
			"xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx" +
			"xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx" +
			"xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx", // This is 127 times 'x'
		"137f" +
			"7878787878787878787878787878787878787878787878787878787878787878" +
			"7878787878787878787878787878787878787878787878787878787878787878" +
			"7878787878787878787878787878787878787878787878787878787878787878" +
			"78787878787878787878787878787878787878787878787878787878787878",
	},
	{
		"" +
			"xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx" +
			"xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx" +
			"xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx" +
			"xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx", // This is 128 times 'x'
		"138180" +
			"7878787878787878787878787878787878787878787878787878787878787878" +
			"7878787878787878787878787878787878787878787878787878787878787878" +
			"7878787878787878787878787878787878787878787878787878787878787878" +
			"7878787878787878787878787878787878787878787878787878787878787878",
	},
	{ia5StringTest{"test"}, "3006160474657374"},
	{optionalRawValueTest{}, "3000"},
	{printableStringTest{"test"}, "3006130474657374"},
	{printableStringTest{"test*"}, "30071305746573742a"},
	{rawContentsStruct{nil, 64}, "3003020140"},
	{rawContentsStruct{[]byte{0x30, 3, 1, 2, 3}, 64}, "3003010203"},
	{RawValue{Tag: 1, Class: 2, IsCompound: false, Bytes: []byte{1, 2, 3}}, "8103010203"},
	{testSET([]int{10}), "310302010a"},
}

func TestMarshal(t *testing.T) {
	for i, test := range marshalTests {
		data, err := Marshal(test.in)
		if err != nil {
			t.Errorf("#%d failed: %s", i, err)
		}
		out, _ := hex.DecodeString(test.out)
		if bytes.Compare(out, data) != 0 {
			t.Errorf("#%d got: %x want %x", i, data, out)
		}
	}
}