package core

import (
	"bytes"
	"encoding/hex"
	"testing"

	"github.com/CityOfZion/neo-go/pkg/core/transaction"
	"github.com/CityOfZion/neo-go/pkg/crypto"
	"github.com/stretchr/testify/assert"
)

// Test blocks are blocks from mainnet with their corresponding index.

func TestDecodeBlock1(t *testing.T) {
	data, err := getBlockData(1)
	if err != nil {
		t.Fatal(err)
	}

	b, err := hex.DecodeString(data["raw"].(string))
	if err != nil {
		t.Fatal(err)
	}

	block := &Block{}
	if err := block.DecodeBinary(bytes.NewReader(b)); err != nil {
		t.Fatal(err)
	}

	assert.Equal(t, uint32(data["index"].(float64)), block.Index)
	assert.Equal(t, uint32(data["version"].(float64)), block.Version)
	assert.Equal(t, data["hash"].(string), block.Hash().ReverseString())
	assert.Equal(t, data["previousblockhash"].(string), block.PrevHash.ReverseString())
	assert.Equal(t, data["merkleroot"].(string), block.MerkleRoot.ReverseString())
	assert.Equal(t, data["nextconsensus"].(string), crypto.AddressFromUint160(block.NextConsensus))

	script := data["script"].(map[string]interface{})
	assert.Equal(t, script["invocation"].(string), hex.EncodeToString(block.Script.InvocationScript))
	assert.Equal(t, script["verification"].(string), hex.EncodeToString(block.Script.VerificationScript))

	tx := data["tx"].([]interface{})
	minerTX := tx[0].(map[string]interface{})
	assert.Equal(t, len(tx), len(block.Transactions))
	assert.Equal(t, minerTX["type"].(string), block.Transactions[0].Type.String())
	assert.Equal(t, len(minerTX["attributes"].([]interface{})), len(block.Transactions[0].Attributes))
}

func TestTrimmedBlock(t *testing.T) {
	block := getDecodedBlock(t, 1)

	b, err := block.Trim()
	if err != nil {
		t.Fatal(err)
	}

	trimmedBlock, err := NewBlockFromTrimmedBytes(b)
	if err != nil {
		t.Fatal(err)
	}

	assert.True(t, trimmedBlock.Trimmed)
	assert.Equal(t, block.Version, trimmedBlock.Version)
	assert.Equal(t, block.PrevHash, trimmedBlock.PrevHash)
	assert.Equal(t, block.MerkleRoot, trimmedBlock.MerkleRoot)
	assert.Equal(t, block.Timestamp, trimmedBlock.Timestamp)
	assert.Equal(t, block.Index, trimmedBlock.Index)
	assert.Equal(t, block.ConsensusData, trimmedBlock.ConsensusData)
	assert.Equal(t, block.NextConsensus, trimmedBlock.NextConsensus)

	assert.Equal(t, block.Script, trimmedBlock.Script)
	assert.Equal(t, len(block.Transactions), len(trimmedBlock.Transactions))
	for i := 0; i < len(block.Transactions); i++ {
		assert.Equal(t, block.Transactions[i].Hash(), trimmedBlock.Transactions[i].Hash())
		assert.True(t, trimmedBlock.Transactions[i].Trimmed)
	}
}

func TestHashBlockEqualsHashHeader(t *testing.T) {
	block := newBlock(0)
	assert.Equal(t, block.Hash(), block.Header().Hash())
}

func TestBlockVerify(t *testing.T) {
	block := newBlock(
		0,
		newTX(transaction.MinerType),
		newTX(transaction.IssueType),
	)
	assert.True(t, block.Verify(false))

	block.Transactions = []*transaction.Transaction{
		{Type: transaction.IssueType},
		{Type: transaction.MinerType},
	}
	assert.False(t, block.Verify(false))

	block.Transactions = []*transaction.Transaction{
		{Type: transaction.MinerType},
		{Type: transaction.MinerType},
	}
	assert.False(t, block.Verify(false))
}