package core

import (
	"testing"
	"time"

	"github.com/stretchr/testify/assert"
)

func TestBlockchainDataStructure(t *testing.T) {
	// dir, err := ioutil.TempDir("", "db")
	// assert.Nil(t, err)
	// db, err := db.New(dir)
	// assert.Nil(t, err)
	//
	// bc := NewBlockchain(db, uint64(1))
	block := &Block{
		PrevHash:  Hash{},
		Txs:       []Tx{},
		Miner:     Address{},
		Timestamp: time.Now(),
		Nonce:     0,
		Hash:      HashBytes([]byte("blockhash")),
	}

	block2, err := BlockFromBytes(block.Bytes())
	assert.Nil(t, err)
	assert.Equal(t, block2.Bytes(), block.Bytes())
}

/*
func TestGetBlock(t *testing.T) {
	// dir, err := ioutil.TempDir("", "db")
	// assert.Nil(t, err)
	// db, err := db.New(dir)
	// assert.Nil(t, err)
	//
	// bc := NewBlockchain(db, uint64(1))

	block := &Block{
		Height:    uint64(1),
		PrevHash:  Hash{},
		Txs:       []Tx{},
		Miner:     Address{},
		Timestamp: time.Now(),
		Nonce:     0,
		Hash:      HashBytes([]byte("blockhash")),
	}
	assert.Equal(t, block.Height, uint64(1))

	// block.CalculateHash()

	// err = bc.AddBlock(block)
	// assert.Nil(t, err)
	//
	// block2, err := bc.GetBlock(block.Hash)
	// assert.Nil(t, err)
	// assert.Equal(t, block.Bytes(), block2.Bytes())
}

func TestGetPrevBlock(t *testing.T) {
	dir, err := ioutil.TempDir("", "db")
	assert.Nil(t, err)
	db, err := db.New(dir)
	assert.Nil(t, err)

	bc := NewBlockchain(db, uint64(1))

	var prevHash Hash
	for i := 0; i < 10; i++ {
		block := &Block{
			Height:    uint64(i + 1),
			PrevHash:  prevHash,
			Txs:       []Tx{},
			Miner:     Address{},
			Timestamp: time.Now(),
			Nonce:     0,
			Hash:      Hash{},
		}
		block.CalculatePoW(bc.Difficulty)
		assert.Equal(t, block.Height, uint64(i+1))
		prevHash = block.Hash

		err = bc.AddBlock(block)
		assert.Nil(t, err)
		assert.Equal(t, bc.LastBlock.Height, block.Height)
	}
	block9, err := bc.GetPrevBlock(bc.LastBlock.Hash)
	assert.Nil(t, err)
	assert.Equal(t, block9.Height, uint64(9))

	block8, err := bc.GetPrevBlock(block9.Hash)
	assert.Nil(t, err)
	assert.Equal(t, block8.Height, uint64(8))

	currentBlock := bc.LastBlock
	for err == nil {
		currentBlock, err = bc.GetPrevBlock(currentBlock.Hash)
	}
	assert.Equal(t, err.Error(), "This was the oldest block")
}

func TestAddBlockWithTx(t *testing.T) {
	addr0 := Address(HashBytes([]byte("addr0")))
	addr1 := Address(HashBytes([]byte("addr1")))

	dir, err := ioutil.TempDir("", "db")
	assert.Nil(t, err)
	db, err := db.New(dir)
	assert.Nil(t, err)

	bc := NewBlockchain(db, uint64(1))

	var txs []Tx
	tx := NewTx(addr0, addr1, []Input{}, []Output{})
	txs = append(txs, *tx)
	block := &Block{
		PrevHash:  Hash{},
		NextHash:  Hash{},
		Txs:       txs,
		Miner:     Address{},
		Timestamp: time.Now(),
		Nonce:     0,
		Hash:      HashBytes([]byte("blockhash")),
	}

	block2, err := BlockFromBytes(block.Bytes())
	assert.Nil(t, err)
	assert.Equal(t, block2.Bytes(), block.Bytes())
}

func TestPoABlockchainDataStructure(t *testing.T) {
	dir, err := ioutil.TempDir("", "db")
	assert.Nil(t, err)
	db, err := db.New(dir)
	assert.Nil(t, err)

	var authNodesPubK []*ecdsa.PublicKey
	for i := 0; i < 3; i++ {
		privK, err := NewKey()
		assert.Nil(t, err)
		authNodesPubK = append(authNodesPubK, &privK.PublicKey)
	}

	bc := NewPoABlockchain(db, authNodesPubK)
	block := &Block{
		PrevHash:  Hash{},
		NextHash:  Hash{},
		Txs:       []Tx{},
		Miner:     Address{},
		Timestamp: time.Now(),
		Nonce:     0,
		Hash:      HashBytes([]byte("blockhash")),
	}

	block2, err := BlockFromBytes(block.Bytes())
	assert.Nil(t, err)
	assert.Equal(t, block2.Bytes(), block.Bytes())
}
*/