// 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"

	"github.com/ethereum/go-ethereum/common/hexutil"
)

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 TestHashJsonValidation(t *testing.T) {
	var tests = []struct {
		Prefix string
		Size   int
		Error  string
	}{
		{"", 62, hexutil.ErrMissingPrefix.Error()},
		{"0x", 66, "hex string has length 66, want 64 for Hash"},
		{"0x", 63, hexutil.ErrOddLength.Error()},
		{"0x", 0, "hex string has length 0, want 64 for 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)
			}
		}
	}
}
