/*
 * Copyright 2018 Intel Corporation, Inc
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package rb

import (
	"bytes"
	"io/ioutil"
	"os"
	"path/filepath"
	"strings"
	"testing"
)

func TestIsTarGz(t *testing.T) {

	t.Run("Valid tar.gz", func(t *testing.T) {
		content := []byte{
			0x1f, 0x8b, 0x08, 0x08, 0xb0, 0x6b, 0xf4, 0x5b,
			0x00, 0x03, 0x74, 0x65, 0x73, 0x74, 0x2e, 0x74,
			0x61, 0x72, 0x00, 0xed, 0xce, 0x41, 0x0a, 0xc2,
			0x30, 0x10, 0x85, 0xe1, 0xac, 0x3d, 0x45, 0x4e,
			0x50, 0x12, 0xd2, 0xc4, 0xe3, 0x48, 0xa0, 0x01,
			0x4b, 0x52, 0x0b, 0xed, 0x88, 0x1e, 0xdf, 0x48,
			0x11, 0x5c, 0x08, 0xa5, 0x8b, 0x52, 0x84, 0xff,
			0xdb, 0xbc, 0x61, 0x66, 0x16, 0x4f, 0xd2, 0x2c,
			0x8d, 0x3c, 0x45, 0xed, 0xc8, 0x54, 0x21, 0xb4,
			0xef, 0xb4, 0x67, 0x6f, 0xbe, 0x73, 0x61, 0x9d,
			0xb2, 0xce, 0xd5, 0x55, 0xf0, 0xde, 0xd7, 0x3f,
			0xdb, 0xd6, 0x49, 0x69, 0xb3, 0x67, 0xa9, 0x8f,
			0xfb, 0x2c, 0x71, 0xd2, 0x5a, 0xc5, 0xee, 0x92,
			0x73, 0x8e, 0x43, 0x7f, 0x4b, 0x3f, 0xff, 0xd6,
			0xee, 0x7f, 0xea, 0x9a, 0x4a, 0x19, 0x1f, 0xe3,
			0x54, 0xba, 0xd3, 0xd1, 0x55, 0x00, 0x00, 0x00,
			0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
			0x00, 0x00, 0x00, 0x1b, 0xbc, 0x00, 0xb5, 0xe8,
			0x4a, 0xf9, 0x00, 0x28, 0x00, 0x00,
		}

		err := isTarGz(bytes.NewBuffer(content))
		if err != nil {
			t.Errorf("Error reading valid tar.gz file %s", err.Error())
		}
	})

	t.Run("Invalid tar.gz", func(t *testing.T) {
		content := []byte{
			0x1f, 0x8b, 0x08, 0x00, 0x00, 0x00, 0x00, 0x00,
			0x00, 0xff, 0xf2, 0x48, 0xcd,
		}

		err := isTarGz(bytes.NewBuffer(content))
		if err == nil {
			t.Errorf("Error should NOT be nil")
		}
	})

	t.Run("Empty tar.gz", func(t *testing.T) {
		content := []byte{}
		err := isTarGz(bytes.NewBuffer(content))
		if err == nil {
			t.Errorf("Error should NOT be nil")
		}
	})
}

func TestExtractTarBall(t *testing.T) {

	t.Run("Valid tar.gz", func(t *testing.T) {
		content := []byte{
			0x1f, 0x8b, 0x08, 0x08, 0xb0, 0x6b, 0xf4, 0x5b,
			0x00, 0x03, 0x74, 0x65, 0x73, 0x74, 0x2e, 0x74,
			0x61, 0x72, 0x00, 0xed, 0xce, 0x41, 0x0a, 0xc2,
			0x30, 0x10, 0x85, 0xe1, 0xac, 0x3d, 0x45, 0x4e,
			0x50, 0x12, 0xd2, 0xc4, 0xe3, 0x48, 0xa0, 0x01,
			0x4b, 0x52, 0x0b, 0xed, 0x88, 0x1e, 0xdf, 0x48,
			0x11, 0x5c, 0x08, 0xa5, 0x8b, 0x52, 0x84, 0xff,
			0xdb, 0xbc, 0x61, 0x66, 0x16, 0x4f, 0xd2, 0x2c,
			0x8d, 0x3c, 0x45, 0xed, 0xc8, 0x54, 0x21, 0xb4,
			0xef, 0xb4, 0x67, 0x6f, 0xbe, 0x73, 0x61, 0x9d,
			0xb2, 0xce, 0xd5, 0x55, 0xf0, 0xde, 0xd7, 0x3f,
			0xdb, 0xd6, 0x49, 0x69, 0xb3, 0x67, 0xa9, 0x8f,
			0xfb, 0x2c, 0x71, 0xd2, 0x5a, 0xc5, 0xee, 0x92,
			0x73, 0x8e, 0x43, 0x7f, 0x4b, 0x3f, 0xff, 0xd6,
			0xee, 0x7f, 0xea, 0x9a, 0x4a, 0x19, 0x1f, 0xe3,
			0x54, 0xba, 0xd3, 0xd1, 0x55, 0x00, 0x00, 0x00,
			0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
			0x00, 0x00, 0x00, 0x1b, 0xbc, 0x00, 0xb5, 0xe8,
			0x4a, 0xf9, 0x00, 0x28, 0x00, 0x00,
		}

		path, err := ExtractTarBall(bytes.NewBuffer(content))
		defer os.RemoveAll(path)
		if err != nil {
			t.Errorf("Error reading valid tar.gz file %s", err.Error())
		}
		fcontent, err := ioutil.ReadFile(filepath.Join(path, "test.txt"))
		if err != nil {
			t.Errorf("Error reading content of valid tar.gz file %s", err.Error())
		}
		if strings.Contains(string(fcontent), "helloworld") == false {
			t.Errorf("Incorrect content read from path: %s", path)
		}
	})

	t.Run("Invalid tar.gz", func(t *testing.T) {
		content := []byte{
			0x1f, 0x8b, 0x08, 0x00, 0x00, 0x00, 0x00, 0x00,
			0x00, 0xff, 0xf2, 0x48, 0xcd,
		}

		path, err := ExtractTarBall(bytes.NewBuffer(content))
		defer os.RemoveAll(path)
		if err == nil {
			t.Errorf("Error should NOT be nil")
		}
	})

	t.Run("Empty tar.gz", func(t *testing.T) {
		content := []byte{}
		path, err := ExtractTarBall(bytes.NewBuffer(content))
		defer os.RemoveAll(path)
		if err == nil {
			t.Errorf("Error should NOT be nil")
		}
	})

	t.Run("Specific tar.gz with '.' entry", func(t *testing.T) {
		content := []byte{
			0x1f, 0x8b, 0x08, 0x00, 0x00, 0x00, 0x00, 0x00,
			0x00, 0xff, 0xed, 0x94, 0xcd, 0x0a, 0xc3, 0x20,
			0x10, 0x84, 0x3d, 0xfb, 0x14, 0x4b, 0xee, 0x29,
			0x6b, 0x4c, 0x14, 0x7c, 0x99, 0x22, 0xd4, 0x42,
			0x20, 0x3f, 0x25, 0x9a, 0x40, 0xde, 0x3e, 0x92,
			0x9c, 0x1a, 0x0a, 0x39, 0x34, 0xb1, 0x87, 0xee,
			0x77, 0x51, 0xd6, 0xc3, 0x8c, 0x8c, 0x23, 0x63,
			0xd7, 0x83, 0x02, 0x51, 0x95, 0x25, 0xe0, 0xc6,
			0x7e, 0x5d, 0xf7, 0x42, 0x2a, 0x89, 0x65, 0xa5,
			0xb1, 0x2a, 0xe2, 0x5c, 0x2b, 0x2c, 0x18, 0x60,
			0x02, 0x6f, 0x6c, 0xf4, 0xc1, 0x0e, 0x0c, 0xbf,
			0xd6, 0xda, 0x5f, 0xee, 0x04, 0x6b, 0x29, 0x68,
			0x6d, 0x57, 0x3f, 0x9d, 0x0f, 0xb7, 0xd9, 0xb6,
			0xcd, 0x45, 0x1a, 0x87, 0xf9, 0x2b, 0xfd, 0x9e,
			0xbf, 0x28, 0x24, 0x6a, 0xca, 0x3f, 0x05, 0x79,
			0x9e, 0xf3, 0xc9, 0x0d, 0xbe, 0xee, 0x3b, 0x03,
			0x93, 0xe0, 0x61, 0x7e, 0x39, 0xc3, 0x01, 0x26,
			0xdb, 0x8c, 0xce, 0x1b, 0xc8, 0xfa, 0x78, 0x3a,
			0xd4, 0x0f, 0x77, 0xdf, 0x26, 0xeb, 0x3b, 0xc9,
			0xf8, 0xaf, 0x6d, 0x13, 0x27, 0xf1, 0x29, 0xde,
			0xb3, 0x35, 0x0e, 0xfb, 0x2f, 0xd4, 0xae, 0xff,
			0x52, 0x69, 0x41, 0xfd, 0x4f, 0x41, 0x88, 0x7f,
			0xff, 0x96, 0xbd, 0x01, 0x4d, 0xb5, 0x26, 0x08,
			0x82, 0xf8, 0x1b, 0x16, 0xb6, 0x17, 0x45, 0x61,
			0x00, 0x0e, 0x00, 0x00,
		}

		path, err := ExtractTarBall(bytes.NewBuffer(content))
		defer os.RemoveAll(path)
		if err != nil {
			t.Errorf("This tar.gz should be handled correctly, but '%s' occured", err)
		}
	})
}