// Copyright 2018 Vulcanize
//
// 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 every_block_test

import (
	"math/big"

	"github.com/ethereum/go-ethereum/ethclient"
	"github.com/ethereum/go-ethereum/rpc"
	. "github.com/onsi/ginkgo"
	. "github.com/onsi/gomega"

	"github.com/ethereum/go-ethereum/common"
	"github.com/vulcanize/vulcanizedb/examples/constants"
	"github.com/vulcanize/vulcanizedb/examples/erc20_watcher/every_block"
	"github.com/vulcanize/vulcanizedb/pkg/fakes"
	"github.com/vulcanize/vulcanizedb/pkg/geth"
	"github.com/vulcanize/vulcanizedb/pkg/geth/client"
	rpc2 "github.com/vulcanize/vulcanizedb/pkg/geth/converters/rpc"
	"github.com/vulcanize/vulcanizedb/pkg/geth/node"
)

var _ = Describe("ERC20 Getter", func() {
	blockNumber := int64(6194634)

	Describe("totalSupply", func() {
		It("gets total supply data from the blockchain with the correct arguments", func() {
			fakeBlockChain := fakes.NewMockBlockChain()
			testGetter := every_block.NewGetter(fakeBlockChain)
			testAbi := "testAbi"
			testContractAddress := "testContractAddress"

			_, err := testGetter.GetTotalSupply(testAbi, testContractAddress, blockNumber)

			Expect(err).NotTo(HaveOccurred())
			expectedResult := big.Int{}
			expected := &expectedResult
			fakeBlockChain.AssertFetchContractDataCalledWith(testAbi, testContractAddress, "totalSupply", nil, &expected, blockNumber)
		})

		It("gets dai token's total supply at the given block height", func() {
			infuraIPC := "https://mainnet.infura.io/v3/b09888c1113640cc9ab42750ce750c05"
			rawRpcClient, err := rpc.Dial(infuraIPC)
			Expect(err).NotTo(HaveOccurred())
			rpcClient := client.NewRpcClient(rawRpcClient, infuraIPC)
			ethClient := ethclient.NewClient(rawRpcClient)
			blockChainClient := client.NewEthClient(ethClient)
			node := node.MakeNode(rpcClient)
			transactionConverter := rpc2.NewRpcTransactionConverter(ethClient)
			blockChain := geth.NewBlockChain(blockChainClient, node, transactionConverter)
			realGetter := every_block.NewGetter(blockChain)
			result, err := realGetter.GetTotalSupply(constants.DaiAbiString, constants.DaiContractAddress, blockNumber)

			Expect(err).NotTo(HaveOccurred())
			expectedResult := big.Int{}
			expectedResult.SetString("47327413946297204537985606", 10)
			Expect(result.String()).To(Equal(expectedResult.String()))
		})

		It("returns an error if the call to the blockchain fails", func() {
			blockChain := fakes.NewMockBlockChain()
			blockChain.SetFetchContractDataErr(fakes.FakeError)
			errorGetter := every_block.NewGetter(blockChain)
			result, err := errorGetter.GetTotalSupply("", "", 0)

			Expect(result.String()).To(Equal("0"))
			Expect(err).To(HaveOccurred())
			Expect(err.Error()).To(ContainSubstring("totalSupply"))
			Expect(err.Error()).To(ContainSubstring(fakes.FakeError.Error()))
		})
	})

	Describe("balanceOf", func() {
		It("gets balance of a token holder address at a token contract address from the blockchain with the correct arguments", func() {
			fakeBlockChain := fakes.NewMockBlockChain()
			testGetter := every_block.NewGetter(fakeBlockChain)
			testAbi := "testAbi"
			testContractAddress := "testContractAddress"

			testTokenHolderAddress := common.HexToAddress("0x2cccc4b4708b318a6290511aac75d6c3dbe0cf9f")
			hashArgs := []common.Address{testTokenHolderAddress}
			balanceOfArgs := make([]interface{}, len(hashArgs))
			for i, s := range hashArgs {
				balanceOfArgs[i] = s
			}

			_, err := testGetter.GetBalance(testAbi, testContractAddress, blockNumber, balanceOfArgs)

			Expect(err).NotTo(HaveOccurred())
			expectedResult := big.Int{}
			expected := &expectedResult
			fakeBlockChain.AssertFetchContractDataCalledWith(testAbi, testContractAddress, "balanceOf", balanceOfArgs, &expected, blockNumber)
		})

		It("gets a token holder address's balance on the dai contract at the given block height", func() {
			infuraIPC := "https://mainnet.infura.io/J5Vd2fRtGsw0zZ0Ov3BL"
			rawRpcClient, err := rpc.Dial(infuraIPC)
			Expect(err).NotTo(HaveOccurred())
			rpcClient := client.NewRpcClient(rawRpcClient, infuraIPC)
			ethClient := ethclient.NewClient(rawRpcClient)
			blockChainClient := client.NewEthClient(ethClient)
			node := node.MakeNode(rpcClient)
			transactionConverter := rpc2.NewRpcTransactionConverter(ethClient)
			blockChain := geth.NewBlockChain(blockChainClient, node, transactionConverter)
			realGetter := every_block.NewGetter(blockChain)

			testTokenHolderAddress := common.HexToAddress("0x2cccc4b4708b318a6290511aac75d6c3dbe0cf9f")
			hashArgs := []common.Address{testTokenHolderAddress}
			balanceOfArgs := make([]interface{}, len(hashArgs))
			for i, s := range hashArgs {
				balanceOfArgs[i] = s
			}

			result, err := realGetter.GetBalance(constants.DaiAbiString, constants.DaiContractAddress, blockNumber, balanceOfArgs)

			Expect(err).NotTo(HaveOccurred())
			expectedResult := big.Int{}
			expectedResult.SetString("1000000000000000000000000", 10)
			Expect(result.String()).To(Equal(expectedResult.String()))
		})

		It("returns an error if the call to the blockchain fails", func() {
			blockChain := fakes.NewMockBlockChain()
			blockChain.SetFetchContractDataErr(fakes.FakeError)
			errorGetter := every_block.NewGetter(blockChain)
			result, err := errorGetter.GetBalance("", "", 0, nil)

			Expect(result.String()).To(Equal("0"))
			Expect(err).To(HaveOccurred())
			Expect(err.Error()).To(ContainSubstring("balanceOf"))
			Expect(err.Error()).To(ContainSubstring(fakes.FakeError.Error()))
		})
	})

	Describe("allowance", func() {
		It("gets allowance data from the blockchain with the correct arguments", func() {
			fakeBlockChain := fakes.NewMockBlockChain()
			testGetter := every_block.NewGetter(fakeBlockChain)
			testAbi := "testAbi"
			testContractAddress := "testContractAddress"

			testTokenHolderAddress := common.HexToAddress("0x2cccc4b4708b318a6290511aac75d6c3dbe0cf9f")
			testTokenSpenderAddress := common.HexToAddress("0x2cccc4b4708b318a6290511aac75d6c3dbe0cf9f")

			hashArgs := []common.Address{testTokenHolderAddress, testTokenSpenderAddress}
			allowanceArgs := make([]interface{}, len(hashArgs))
			for i, s := range hashArgs {
				allowanceArgs[i] = s
			}

			_, err := testGetter.GetAllowance(testAbi, testContractAddress, blockNumber, allowanceArgs)

			Expect(err).NotTo(HaveOccurred())
			expectedResult := big.Int{}
			expected := &expectedResult
			fakeBlockChain.AssertFetchContractDataCalledWith(testAbi, testContractAddress, "allowance", allowanceArgs, &expected, blockNumber)
		})

		It("gets the allowance for a spending address and holder address on the dai contract at the given block height", func() {
			infuraIPC := "https://mainnet.infura.io/J5Vd2fRtGsw0zZ0Ov3BL"
			rawRpcClient, err := rpc.Dial(infuraIPC)
			Expect(err).NotTo(HaveOccurred())
			rpcClient := client.NewRpcClient(rawRpcClient, infuraIPC)
			ethClient := ethclient.NewClient(rawRpcClient)
			blockChainClient := client.NewEthClient(ethClient)
			node := node.MakeNode(rpcClient)
			transactionConverter := rpc2.NewRpcTransactionConverter(ethClient)
			blockChain := geth.NewBlockChain(blockChainClient, node, transactionConverter)
			realGetter := every_block.NewGetter(blockChain)

			testTokenHolderAddress := common.HexToAddress("0x2cccc4b4708b318a6290511aac75d6c3dbe0cf9f")
			testTokenSpenderAddress := common.HexToAddress("0x2cccc4b4708b318a6290511aac75d6c3dbe0cf9f")

			hashArgs := []common.Address{testTokenHolderAddress, testTokenSpenderAddress}
			allowanceArgs := make([]interface{}, len(hashArgs))
			for i, s := range hashArgs {
				allowanceArgs[i] = s
			}

			result, err := realGetter.GetAllowance(constants.DaiAbiString, constants.DaiContractAddress, blockNumber, allowanceArgs)

			Expect(err).NotTo(HaveOccurred())
			expectedResult := big.Int{}
			expectedResult.SetString("0", 10)
			Expect(result.String()).To(Equal(expectedResult.String()))
		})

		It("returns an error if the call to the blockchain fails", func() {
			blockChain := fakes.NewMockBlockChain()
			blockChain.SetFetchContractDataErr(fakes.FakeError)
			errorGetter := every_block.NewGetter(blockChain)
			result, err := errorGetter.GetAllowance("", "", 0, nil)

			Expect(result.String()).To(Equal("0"))
			Expect(err).To(HaveOccurred())
			Expect(err.Error()).To(ContainSubstring("allowance"))
			Expect(err.Error()).To(ContainSubstring(fakes.FakeError.Error()))
		})
	})
})