// Copyright 2018 The go-ethereum Authors
// This file is part of go-ethereum.
//
// go-ethereum is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// go-ethereum 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 General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with go-ethereum. If not, see <http://www.gnu.org/licenses/>.
//
package core

import (
	"context"
	"encoding/json"
	"fmt"
	"math/big"
	"testing"

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

var typesStandard = EIP712Types{
	"EIP712Domain": {
		{
			"name": "name",
			"type": "string",
		},
		{
			"name": "version",
			"type": "string",
		},
		{
			"name": "chainId",
			"type": "uint256",
		},
		{
			"name": "verifyingContract",
			"type": "address",
		},
	},
	"Person": {
		{
			"name": "name",
			"type": "string",
		},
		{
			"name": "wallet",
			"type": "address",
		},
	},
	"Mail": {
		{
			"name": "from",
			"type": "Person",
		},
		{
			"name": "to",
			"type": "Person",
		},
		{
			"name": "contents",
			"type": "string",
		},
	},
}

const primaryType = "Mail"

var domainStandard = EIP712Domain{
	"Ether Mail",
	"1",
	big.NewInt(1),
	"0xCcCCccccCCCCcCCCCCCcCcCccCcCCCcCcccccccC",
	"",
}

var messageStandard = map[string]interface{}{
	"from": map[string]interface{}{
		"name":   "Cow",
		"wallet": "0xCD2a3d9F938E13CD947Ec05AbC7FE734Df8DD826",
	},
	"to": map[string]interface{}{
		"name":   "Bob",
		"wallet": "0xbBbBBBBbbBBBbbbBbbBbbbbBBbBbbbbBbBbbBBbB",
	},
	"contents": "Hello, Bob!",
}

var typedData = TypedData{
	Types:       typesStandard,
	PrimaryType: primaryType,
	Domain:      domainStandard,
	Message:     messageStandard,
}

func TestSignData(t *testing.T) {
	api, control := setup(t)
	//Create two accounts
	createAccount(control, api, t)
	createAccount(control, api, t)
	control <- "1"
	list, err := api.List(context.Background())
	if err != nil {
		t.Fatal(err)
	}
	a := common.NewMixedcaseAddress(list[0])

	control <- "Y"
	control <- "wrongpassword"
	signature, err := api.SignData(context.Background(), TextPlain.Mime, a, hexutil.Encode([]byte("EHLO world")))
	if signature != nil {
		t.Errorf("Expected nil-data, got %x", signature)
	}
	if err != keystore.ErrDecrypt {
		t.Errorf("Expected ErrLocked! %v", err)
	}
	control <- "No way"
	signature, err = api.SignData(context.Background(), TextPlain.Mime, a, hexutil.Encode([]byte("EHLO world")))
	if signature != nil {
		t.Errorf("Expected nil-data, got %x", signature)
	}
	if err != ErrRequestDenied {
		t.Errorf("Expected ErrRequestDenied! %v", err)
	}
	// text/plain
	control <- "Y"
	control <- "a_long_password"
	signature, err = api.SignData(context.Background(), TextPlain.Mime, a, hexutil.Encode([]byte("EHLO world")))
	if err != nil {
		t.Fatal(err)
	}
	if signature == nil || len(signature) != 65 {
		t.Errorf("Expected 65 byte signature (got %d bytes)", len(signature))
	}
	// data/typed
	control <- "Y"
	control <- "a_long_password"
	signature, err = api.SignTypedData(context.Background(), a, typedData)
	if err != nil {
		t.Fatal(err)
	}
	if signature == nil || len(signature) != 65 {
		t.Errorf("Expected 65 byte signature (got %d bytes)", len(signature))
	}
}

func TestHashStruct(t *testing.T) {
	hash, err := typedData.HashStruct(typedData.PrimaryType, typedData.Message)
	if err != nil {
		t.Fatal(err)
	}
	mainHash := fmt.Sprintf("0x%s", common.Bytes2Hex(hash))
	if mainHash != "0xc52c0ee5d84264471806290a3f2c4cecfc5490626bf912d01f240d7a274b371e" {
		t.Errorf("Expected different hashStruct result (got %s)", mainHash)
	}

	hash, err = typedData.HashStruct("EIP712Domain", typedData.Domain.Map())
	if err != nil {
		t.Error(err)
	}
	domainHash := fmt.Sprintf("0x%s", common.Bytes2Hex(hash))
	if domainHash != "0xf2cee375fa42b42143804025fc449deafd50cc031ca257e0b194a650a912090f" {
		t.Errorf("Expected different hashStruct result (got %s)", domainHash)
	}
}

func TestEncodeType(t *testing.T) {
	domainTypeEncoding := string(typedData.EncodeType("EIP712Domain"))
	if domainTypeEncoding != "EIP712Domain(string name,string version,uint256 chainId,address verifyingContract)" {
		t.Errorf("Expected different encodeType result (got %s)", domainTypeEncoding)
	}

	mailTypeEncoding := string(typedData.EncodeType(typedData.PrimaryType))
	if mailTypeEncoding != "Mail(Person from,Person to,string contents)Person(string name,address wallet)" {
		t.Errorf("Expected different encodeType result (got %s)", mailTypeEncoding)
	}
}

func TestTypeHash(t *testing.T) {
	mailTypeHash := fmt.Sprintf("0x%s", common.Bytes2Hex(typedData.TypeHash(typedData.PrimaryType)))
	if mailTypeHash != "0xa0cedeb2dc280ba39b857546d74f5549c3a1d7bdc2dd96bf881f76108e23dac2" {
		t.Errorf("Expected different typeHash result (got %s)", mailTypeHash)
	}
}

func TestEncodeData(t *testing.T) {
	hash, err := typedData.EncodeData(typedData.PrimaryType, typedData.Message)
	if err != nil {
		t.Fatal(err)
	}
	dataEncoding := fmt.Sprintf("0x%s", common.Bytes2Hex(hash))
	if dataEncoding != "0xa0cedeb2dc280ba39b857546d74f5549c3a1d7bdc2dd96bf881f76108e23dac2fc71e5fa27ff56c350aa531bc129ebdf613b772b6604664f5d8dbe21b85eb0c8cd54f074a4af31b4411ff6a60c9719dbd559c221c8ac3492d9d872b041d703d1b5aadf3154a261abdd9086fc627b61efca26ae5702701d05cd2305f7c52a2fc8" {
		t.Errorf("Expected different encodeData result (got %s)", dataEncoding)
	}
}

func TestMalformedData1(t *testing.T) {
	var data = `
    {
      "types": {
        "EIP712Domain": [
          {
            "name": "name",
            "type": "string"
          },
          {
            "name": "version",
            "type": "string"
          },
          {
            "name": "chainId",
            "type": "uint256"
          },
          {
            "name": "verifyingContract",
            "type": "address"
          }
        ],
        "Person": [
          {
            "name": "name",
            "type": "string"
          },
          {
            "name": "wallet",
            "type": "address"
          }
        ],
        "Mail": [
          {
            "name": "from",
            "type": "Person"
          },
          {
            "name": "to",
            "type": "Person"
          },
          {
            "name": "contents",
            "type": "Person"
          }
        ]
      },
      "primaryType": "Mail",
      "domain": {
        "name": "Ether Mail",
        "version": "1",
        "chainId": 1,
        "verifyingContract": "0xCcCCccccCCCCcCCCCCCcCcCccCcCCCcCcccccccC"
      },
      "message": {
        "from": {
          "name": "Cow",
          "wallet": "0xCD2a3d9F938E13CD947Ec05AbC7FE734Df8DD826"
        },
        "to": {
          "name": "Bob",
          "wallet": "0xbBbBBBBbbBBBbbbBbbBbbbbBBbBbbbbBbBbbBBbB"
        },
        "contents": "Hello, Bob!"
      }
    }

`
	var typedData TypedData
	err := json.Unmarshal([]byte(data), &typedData)
	if err != nil {
		t.Fatalf("unmarshalling failed %v", err)
	}
	err = typedData.Validate()
	if err != nil {
		t.Fatalf("Expected no error, got %v", err)
	}
	_, err = typedData.HashStruct(typedData.PrimaryType, typedData.Message)
	if err.Error() != "provided data 'Hello, Bob!' doesn't match type 'Person'" {
		t.Errorf("Expected `provided data 'Hello, Bob!' doesn't match type 'Person'`, got %v", err)
	}
}

func TestMalformedDomainData(t *testing.T) {
	var data = `
{
      "types": {
        "EIP712Domain": [
          {
            "name": "name",
            "type": "string"
          },
          {
            "name": "version",
            "type": "string"
          },
          {
            "name": "chainId",
            "type": "uint256"
          },
          {
            "name": "verifyingContract",
            "type": "address"
          }
        ],
        "Person": [
          {
            "name": "name",
            "type": "string"
          },
          {
            "name": "wallet",
            "type": "address"
          }
        ],
        "Mail": [
          {
            "name": "from",
            "type": "Person"
          },
          {
            "name": "to",
            "type": "Person"
          },
          {
            "name": "contents",
            "type": "Blahonga"
          }
        ]
      },
      "primaryType": "Mail",
      "domain": {
        "name": "Ether Mail",
        "version": "1",
        "chainId": 1,
        "verifyingContract": "0xCcCCccccCCCCcCCCCCCcCcCccCcCCCcCcccccccC"
      },
      "message": {
        "from": {
          "name": "Cow",
          "wallet": "0xCD2a3d9F938E13CD947Ec05AbC7FE734Df8DD826"
        },
        "to": {
          "name": "Bob",
          "wallet": "0xbBbBBBBbbBBBbbbBbbBbbbbBBbBbbbbBbBbbBBbB"
        },
        "contents": "Hello, Bob!"
      }
    }`
	var typedData TypedData
	err := json.Unmarshal([]byte(data), &typedData)
	if err != nil {
		t.Fatalf("unmarshalling failed %v", err)
	}
	err = typedData.Validate()
	if err == nil {
		t.Fatalf("Expected `referenced type 'Blahonga' is undefined`, got %v", err)
	}
	_, err = typedData.HashStruct(typedData.PrimaryType, typedData.Message)
	if err.Error() != "unrecognized interface type <nil>" {
		t.Errorf("Expected `unrecognized interface type <nil>`, got %v", err)
	}
}

func TestMalformedData3(t *testing.T) {
	var data = `
    {
      "types": {
        "EIP712Domain": [
          {
            "name": "name",
            "type": "string"
          },
          {
            "name": "version",
            "type": "string"
          },
          {
            "name": "chainId",
            "type": "uint256"
          },
          {
            "name": "verifyingContract",
            "type": "address"
          }
        ],
        "Person": [
          {
            "name": "name",
            "type": "string"
          },
          {
            "name": "wallet",
            "type": "address"
          }
        ],
        "Mail": [
          {
            "name": "from",
            "type": "Person"
          },
          {
            "name": "to",
            "type": "Person"
          },
          {
            "name": "contents",
            "type": "string"
          }
        ]
      },
      "primaryType": "Mail",
      "domain": {
        "name": "Ether Mail",
        "version": "1",
        "chainId": 1,
        "vxerifyingContract": "0xCcCCccccCCCCcCCCCCCcCcCccCcCCCcCcccccccC"
      },
      "message": {
        "from": {
          "name": "Cow",
          "wallet": "0xCD2a3d9F938E13CD947Ec05AbC7FE734Df8DD826"
        },
        "to": {
          "name": "Bob",
          "wallet": "0xbBbBBBBbbBBBbbbBbbBbbbbBBbBbbbbBbBbbBBbB"
        },
        "contents": "Hello, Bob!"
      }
    }

`
	var typedData TypedData
	err := json.Unmarshal([]byte(data), &typedData)
	if err != nil {
		t.Fatalf("unmarshalling failed %v", err)
	}
	err = typedData.Validate()
	if err != nil {
		t.Fatalf("Expected no error, got %v", err)
	}
	_, err = typedData.HashStruct("EIP712Domain", typedData.Domain.Map())
	if err.Error() != "provided data '<nil>' doesn't match type 'address'" {
		t.Errorf("Expected `provided data '<nil>' doesn't match type 'address'`, got %v", err)
	}
}

func TestMalformedData4(t *testing.T) {
	var data = `
    {
      "types": {
        "EIP712Domain": [
          {
            "name": "name",
            "type": "string"
          },
          {
            "name": "version",
            "type": "string"
          },
          {
            "name": "chainId",
            "type": "uint256 ... and now for something completely different"
          },
          {
            "name": "verifyingContract",
            "type": "address"
          }
        ],
        "Person": [
          {
            "name": "name",
            "type": "string"
          },
          {
            "name": "test",
            "type": "uint8"
          },
          {
            "name": "wallet",
            "type": "address"
          }
        ],
        "Mail": [
          {
            "name": "from",
            "type": "Person"
          },
          {
            "name": "to",
            "type": "Person"
          },
          {
            "name": "contents",
            "type": "string"
          }
        ]
      },
      "primaryType": "Mail",
      "domain": {
		"Signed by": "Bill Gates -- this text won't affect the hash'",
		"we can": "stuff anything here, really",
        "name": "Ether Mail",
        "version": "65536",
        "chainId": 1,
        "verifyingContract": "0xCCCcccccCCCCcCCCCCCcCcCccCcCCCcCcccccccC"
      },
      "message": {
        "from": {
          "name": "Cow",
          "wallet": "0xcD2a3d9F938E13CD947Ec05AbC7FE734Df8DD826"
        },
        "to": {
          "name": "Bob",
          "test": 65536,
          "wallet": "0xbBbBBBBbbBBBbbbBbbBbbbbBBbBbbbbBbBbbBBbB"
        },
        "blahonga": "zonk bonk",
        "contents": "åäzö \r\n test, Bob!"
      }
    }
`
	// The struct above contains several quirks
	// 1. Using dynamic types and only validating the prefix:
	//{
	//	"name": "chainId",
	//	"type": "uint256 ... and now for something completely different"
	//},
	// 2. Using dynamic types, but not verifying that the data fits into it
	//            "test": 65536, <-- test defined as uint8
	// 3a. Extra data in message
	//  "blahonga": "zonk bonk",
	// 3b ... and in domain
	//  "Signed by": "Bill Gates",

	var typedData TypedData
	err := json.Unmarshal([]byte(data), &typedData)
	if err != nil {
		t.Fatalf("unmarshalling failed %v", err)
	}
	err = typedData.Validate()
	if err.Error() != "unknown atomic type 'uint256 ... and now for something completely different'" {
		t.Fatalf("Expected `unknown atomic type 'uint256 ... and now for something completely different'`, got %v", err)
	}
}