// Copyright 2015 The go-ethereum Authors
// This file is part of the go-ethereum library.
//
// The go-ethereum library is free software: you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// The go-ethereum library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public License
// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.

package common

import (
	"encoding/json"

	"math/big"
	"strings"
	"testing"
)

func TestBytesConversion(t *testing.T) {
	bytes := []byte{5}
	hash := BytesToHash(bytes)

	var exp Hash
	exp[31] = 5

	if hash != exp {
		t.Errorf("expected %x got %x", exp, hash)
	}
}

func TestIsHexAddress(t *testing.T) {
	tests := []struct {
		str string
		exp bool
	}{
		{"0x5aaeb6053f3e94c9b9a09f33669435e7ef1beaed", true},
		{"5aaeb6053f3e94c9b9a09f33669435e7ef1beaed", true},
		{"0X5aaeb6053f3e94c9b9a09f33669435e7ef1beaed", true},
		{"0XAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA", true},
		{"0xAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA", true},
		{"0x5aaeb6053f3e94c9b9a09f33669435e7ef1beaed1", false},
		{"0x5aaeb6053f3e94c9b9a09f33669435e7ef1beae", false},
		{"5aaeb6053f3e94c9b9a09f33669435e7ef1beaed11", false},
		{"0xxaaeb6053f3e94c9b9a09f33669435e7ef1beaed", false},
	}

	for _, test := range tests {
		if result := IsHexAddress(test.str); result != test.exp {
			t.Errorf("IsHexAddress(%s) == %v; expected %v",
				test.str, result, test.exp)
		}
	}
}

func TestHashJsonValidation(t *testing.T) {
	var tests = []struct {
		Prefix string
		Size   int
		Error  string
	}{
		{"", 62, "json: cannot unmarshal hex string without 0x prefix into Go value of type common.Hash"},
		{"0x", 66, "hex string has length 66, want 64 for common.Hash"},
		{"0x", 63, "json: cannot unmarshal hex string of odd length into Go value of type common.Hash"},
		{"0x", 0, "hex string has length 0, want 64 for common.Hash"},
		{"0x", 64, ""},
		{"0X", 64, ""},
	}
	for _, test := range tests {
		input := `"` + test.Prefix + strings.Repeat("0", test.Size) + `"`
		var v Hash
		err := json.Unmarshal([]byte(input), &v)
		if err == nil {
			if test.Error != "" {
				t.Errorf("%s: error mismatch: have nil, want %q", input, test.Error)
			}
		} else {
			if err.Error() != test.Error {
				t.Errorf("%s: error mismatch: have %q, want %q", input, err, test.Error)
			}
		}
	}
}

func TestAddressUnmarshalJSON(t *testing.T) {
	var tests = []struct {
		Input     string
		ShouldErr bool
		Output    *big.Int
	}{
		{"", true, nil},
		{`""`, true, nil},
		{`"0x"`, true, nil},
		{`"0x00"`, true, nil},
		{`"0xG000000000000000000000000000000000000000"`, true, nil},
		{`"0x0000000000000000000000000000000000000000"`, false, big.NewInt(0)},
		{`"0x0000000000000000000000000000000000000010"`, false, big.NewInt(16)},
	}
	for i, test := range tests {
		var v Address
		err := json.Unmarshal([]byte(test.Input), &v)
		if err != nil && !test.ShouldErr {
			t.Errorf("test #%d: unexpected error: %v", i, err)
		}
		if err == nil {
			if test.ShouldErr {
				t.Errorf("test #%d: expected error, got none", i)
			}
			if v.Big().Cmp(test.Output) != 0 {
				t.Errorf("test #%d: address mismatch: have %v, want %v", i, v.Big(), test.Output)
			}
		}
	}
}

func TestAddressHexChecksum(t *testing.T) {
	var tests = []struct {
		Input  string
		Output string
	}{
		// Test cases from https://github.com/ethereum/EIPs/blob/master/EIPS/eip-55.md#specification
		{"0x5aaeb6053f3e94c9b9a09f33669435e7ef1beaed", "0x5aAeb6053F3E94C9b9A09f33669435E7Ef1BeAed"},
		{"0xfb6916095ca1df60bb79ce92ce3ea74c37c5d359", "0xfB6916095ca1df60bB79Ce92cE3Ea74c37c5d359"},
		{"0xdbf03b407c01e7cd3cbea99509d93f8dddc8c6fb", "0xdbF03B407c01E7cD3CBea99509d93f8DDDC8C6FB"},
		{"0xd1220a0cf47c7b9be7a2e6ba89f429762e7b9adb", "0xD1220A0cf47c7B9Be7A2E6BA89F429762e7b9aDb"},
		// Ensure that non-standard length input values are handled correctly
		{"0xa", "0x000000000000000000000000000000000000000A"},
		{"0x0a", "0x000000000000000000000000000000000000000A"},
		{"0x00a", "0x000000000000000000000000000000000000000A"},
		{"0x000000000000000000000000000000000000000a", "0x000000000000000000000000000000000000000A"},
	}
	for i, test := range tests {
		output := HexToAddress(test.Input).Hex()
		if output != test.Output {
			t.Errorf("test #%d: failed to match when it should (%s != %s)", i, output, test.Output)
		}
	}
}

func BenchmarkAddressHex(b *testing.B) {
	testAddr := HexToAddress("0x5aaeb6053f3e94c9b9a09f33669435e7ef1beaed")
	for n := 0; n < b.N; n++ {
		testAddr.Hex()
	}
}

func TestMixedcaseAccount_Address(t *testing.T) {

	// https://github.com/ethereum/EIPs/blob/master/EIPS/eip-55.md
	// Note: 0X{checksum_addr} is not valid according to spec above

	var res []struct {
		A     MixedcaseAddress
		Valid bool
	}
	if err := json.Unmarshal([]byte(`[
		{"A" : "0xae967917c465db8578ca9024c205720b1a3651A9", "Valid": false},
		{"A" : "0xAe967917c465db8578ca9024c205720b1a3651A9", "Valid": true},
		{"A" : "0XAe967917c465db8578ca9024c205720b1a3651A9", "Valid": false},
		{"A" : "0x1111111111111111111112222222222223333323", "Valid": true}
		]`), &res); err != nil {
		t.Fatal(err)
	}

	for _, r := range res {
		if got := r.A.ValidChecksum(); got != r.Valid {
			t.Errorf("Expected checksum %v, got checksum %v, input %v", r.Valid, got, r.A.String())
		}
	}

	//These should throw exceptions:
	var r2 []MixedcaseAddress
	for _, r := range []string{
		`["0x11111111111111111111122222222222233333"]`,     // Too short
		`["0x111111111111111111111222222222222333332"]`,    // Too short
		`["0x11111111111111111111122222222222233333234"]`,  // Too long
		`["0x111111111111111111111222222222222333332344"]`, // Too long
		`["1111111111111111111112222222222223333323"]`,     // Missing 0x
		`["x1111111111111111111112222222222223333323"]`,    // Missing 0
		`["0xG111111111111111111112222222222223333323"]`,   //Non-hex
	} {
		if err := json.Unmarshal([]byte(r), &r2); err == nil {
			t.Errorf("Expected failure, input %v", r)
		}

	}

}
