package payload

import (
	"testing"

	"github.com/nspcc-dev/neo-go/internal/testserdes"
	"github.com/nspcc-dev/neo-go/pkg/core/block"
	"github.com/nspcc-dev/neo-go/pkg/core/transaction"
	"github.com/stretchr/testify/assert"
)

func TestHeadersEncodeDecode(t *testing.T) {
	t.Run("normal case", func(t *testing.T) {
		headers := newTestHeaders(3)

		testHeadersEncodeDecode(t, headers, 3, nil)
	})

	t.Run("more than max", func(t *testing.T) {
		const sent = MaxHeadersAllowed + 1
		headers := newTestHeaders(sent)

		testHeadersEncodeDecode(t, headers, MaxHeadersAllowed, ErrTooManyHeaders)
	})

	t.Run("zero", func(t *testing.T) {
		headers := newTestHeaders(0)

		testHeadersEncodeDecode(t, headers, 0, ErrNoHeaders)
	})
}

func newTestHeaders(n int) *Headers {
	headers := &Headers{Hdrs: make([]*block.Header, n)}

	for i := range headers.Hdrs {
		headers.Hdrs[i] = &block.Header{
			Index: uint32(i + 1),
			Script: transaction.Witness{
				InvocationScript:   []byte{0x0},
				VerificationScript: []byte{0x1},
			},
		}
	}

	return headers
}

func testHeadersEncodeDecode(t *testing.T, headers *Headers, expected int, retErr error) {
	data, err := testserdes.EncodeBinary(headers)
	assert.Nil(t, err)

	headersDecode := &Headers{}
	rErr := testserdes.DecodeBinary(data, headersDecode)

	assert.Equal(t, retErr, rErr)
	assert.Equal(t, expected, len(headersDecode.Hdrs))

	for i := 0; i < len(headersDecode.Hdrs); i++ {
		assert.Equal(t, headers.Hdrs[i].Version, headersDecode.Hdrs[i].Version)
		assert.Equal(t, headers.Hdrs[i].Index, headersDecode.Hdrs[i].Index)
		assert.Equal(t, headers.Hdrs[i].Script, headersDecode.Hdrs[i].Script)
	}
}

//TODO NEO3.0: Update binary
/*
func TestBinEncodeDecode(t *testing.T) {
	rawBlockHeaders := "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"

	var headerMsg Headers

	rawBlockBytes, _ := hex.DecodeString(rawBlockHeaders)

	assert.NoError(t, testserdes.DecodeBinary(rawBlockBytes, &headerMsg))
	assert.Equal(t, 1, len(headerMsg.Hdrs))

	header := headerMsg.Hdrs[0]
	hash := header.Hash()

	assert.Equal(t, "f3c4ec44c07eccbda974f1ee34bc6654ab6d3f22cd89c2e5c593a16d6cc7e6e8", hash.StringLE())

	data, err := testserdes.EncodeBinary(&headerMsg)
	assert.NoError(t, err)
	assert.Equal(t, hex.EncodeToString(rawBlockBytes), hex.EncodeToString(data))
}
*/