package tests

import (
	"crypto/sha256"
	"encoding/hex"
	"kerma/models"
	"testing"

	"github.com/docker/go/canonical/json"
	. "github.com/smartystreets/goconvey/convey"
)

func TestTransaction(t *testing.T) {
	Convey("Given a new coinbase transaction", t, func() {
		height := uint64(1)
		transaction := models.Transaction{
			Type:   "transaction",
			Height: &height,
			Outputs: []models.Output{
				{
					Pubkey: "62b7c521cd9211579cf70fd4099315643767b96711febaa5c76dc3daf27c281c",
					Value:  50000000000000,
				},
			},
		}

		Convey("When GetType is called, 'transaction' should be returned", func() {
			So(transaction.GetType(), ShouldEqual, "transaction")
		})

		Convey("When GetEntity is called, the transaction should be returned", func() {
			So(transaction.GetEntity(), ShouldResemble, &transaction)
		})

		Convey("When Validate is called, no error should be returned", func() {
			So(transaction.Validate(), ShouldEqual, nil)
		})

		Convey("When IsCoinbaseTx is called, 'true' should be returned", func() {
			So(transaction.IsCoinbaseTx(), ShouldEqual, true)
		})

		Convey("When IsTxInput is called, 'false' should be returned", func() {
			So(transaction.IsTxInput("dasdfasfds"), ShouldEqual, false)
		})

		Convey("When Hash is called, the hash of the cannonical json and no error should be returned", func() {
			transactionJSON, _ := json.MarshalCanonical(transaction)
			hashSum := sha256.Sum256(transactionJSON)

			res, err := transaction.Hash()
			So(hex.EncodeToString(hashSum[:]), ShouldEqual, res)
			So(err, ShouldEqual, nil)
		})
	})

	Convey("Given a new regular transaction", t, func() {
		transaction := models.Transaction{
			Type: "transaction",
			Inputs: []models.Input{
				{
					Outpoint: models.Outpoint{
						Index: 0,
						Txid:  "2fb7adb654b373e85c6b5c596cc110dcb6643ee138768f4aa947e9ddb7d91f8d",
					},
					Sig: "1bc4c05ec180932f08b95a8b5be308bb7b90c4d047720c4953440ea7cf56ba38b7e3b52ae586b594a6ae6649d8be0ae3d6944ffe9a7c5894622c33b9df276909",
				},
			},
			Outputs: []models.Output{
				{
					Pubkey: "857debb2084fc8c87dec10d305993e781d9c9dbf6a81762b2f245095ae6b8fb9",
					Value:  50,
				},
			},
		}

		Convey("When GetType is called, 'transaction' should be returned", func() {
			So(transaction.GetType(), ShouldEqual, "transaction")
		})

		Convey("When GetEntity is called, the transaction should be returned", func() {
			So(transaction.GetEntity(), ShouldResemble, &transaction)
		})

		Convey("When Validate is called, no error should be returned", func() {
			So(transaction.Validate(), ShouldEqual, nil)
		})

		Convey("When IsCoinbaseTx is called, 'false' should be returned", func() {
			So(transaction.IsCoinbaseTx(), ShouldEqual, false)
		})

		Convey("When IsTxInput is called with an input, 'true' should be returned", func() {
			So(transaction.IsTxInput("2fb7adb654b373e85c6b5c596cc110dcb6643ee138768f4aa947e9ddb7d91f8d"), ShouldEqual, true)
		})

		Convey("When IsTxInput is called with a non-input, 'false' should be returned", func() {
			So(transaction.IsTxInput("dasdfasfds"), ShouldEqual, false)
		})

		Convey("When Hash is called, the hash of the cannonical json and no error should be returned", func() {
			transactionJSON, _ := json.MarshalCanonical(transaction)
			hashSum := sha256.Sum256(transactionJSON)

			res, err := transaction.Hash()
			So(hex.EncodeToString(hashSum[:]), ShouldEqual, res)
			So(err, ShouldEqual, nil)
		})

		Convey("When VerifySign is called with a correct signature, 'true' should be returned", func() {
			So(transaction.VerifySign("1bc4c05ec180932f08b95a8b5be308bb7b90c4d047720c4953440ea7cf56ba38b7e3b52ae586b594a6ae6649d8be0ae3d6944ffe9a7c5894622c33b9df276909", "57558a6dae91ac3ab8caf3f543eac9c51cba4ac680ba5ba0d81b5575dc06bc46"), ShouldEqual, true)
		})

		Convey("When VerifySign is called with an incorrect signature, 'false' should be returned", func() {
			So(transaction.VerifySign("", ""), ShouldEqual, false)
		})
	})

	Convey("Given a new incorrect regular transaction", t, func() {
		Convey("With two inputs pointing to the same outpoint", func() {
			transaction := models.Transaction{
				Type: "transaction",
				Inputs: []models.Input{
					{
						Outpoint: models.Outpoint{
							Index: 0,
							Txid:  "2fb7adb654b373e85c6b5c596cc110dcb6643ee138768f4aa947e9ddb7d91f8d",
						},
						Sig: "1bc4c05ec180932f08b95a8b5be308bb7b90c4d047720c4953440ea7cf56ba38b7e3b52ae586b594a6ae6649d8be0ae3d6944ffe9a7c5894622c33b9df276909",
					},
					{
						Outpoint: models.Outpoint{
							Index: 0,
							Txid:  "2fb7adb654b373e85c6b5c596cc110dcb6643ee138768f4aa947e9ddb7d91f8d",
						},
						Sig: "1bc4c05ec180932f08b95a8b5be308bb7b90c4d047720c4953440ea7cf56ba38b7e3b52ae586b594a6ae6649d8be0ae3d6944ffe9a7c5894622c33b9df276909",
					},
				},
				Outputs: []models.Output{
					{
						Pubkey: "857debb2084fc8c87dec10d305993e781d9c9dbf6a81762b2f245095ae6b8fb9",
						Value:  50,
					},
				},
			}

			Convey("When Validate is called, an error should be returned", func() {
				So(transaction.Validate().Error(), ShouldEqual, "multiple transaction inputs with same outpoint found")
			})
		})

		Convey("With negative outpoint index value", func() {
			transaction := models.Transaction{
				Type: "transaction",
				Inputs: []models.Input{
					{
						Outpoint: models.Outpoint{
							Index: -10,
							Txid:  "2fb7adb654b373e85c6b5c596cc110dcb6643ee138768f4aa947e9ddb7d91f8d",
						},
						Sig: "1bc4c05ec180932f08b95a8b5be308bb7b90c4d047720c4953440ea7cf56ba38b7e3b52ae586b594a6ae6649d8be0ae3d6944ffe9a7c5894622c33b9df276909",
					},
				},
				Outputs: []models.Output{
					{
						Pubkey: "857debb2084fc8c87dec10d305993e781d9c9dbf6a81762b2f245095ae6b8fb9",
						Value:  50,
					},
				},
			}

			Convey("When Validate is called, an error should be returned", func() {
				So(transaction.Validate().Error(), ShouldEqual, "transaction input index cannot be negative")
			})
		})

		Convey("With a pubkey that is not hex string", func() {
			transaction := models.Transaction{
				Type: "transaction",
				Inputs: []models.Input{
					{
						Outpoint: models.Outpoint{
							Index: 0,
							Txid:  "2fb7adb654b373e85c6b5c596cc110dcb6643ee138768f4aa947e9ddb7d91f8d",
						},
						Sig: "1bc4c05ec180932f08b95a8b5be308bb7b90c4d047720c4953440ea7cf56ba38b7e3b52ae586b594a6ae6649d8be0ae3d6944ffe9a7c5894622c33b9df276909",
					},
				},
				Outputs: []models.Output{
					{
						Pubkey: "VeryInvalidPubkeyValueWOWThisIsSoInvalidOhMyGod",
						Value:  50,
					},
				},
			}

			Convey("When Validate is called, an error should be returned", func() {
				So(transaction.Validate(), ShouldNotBeNil)
			})
		})
	})
}