package resolver

import (
	"testing"

	"github.com/ethereum/go-ethereum/common"
	"github.com/ethereum/go-ethereum/crypto"
)

type testBackend struct {
	// contracts mock
	contracts map[string](map[string]string)
}

var (
	text     = "test"
	codehash = common.StringToHash("1234")
	hash     = common.BytesToHash(crypto.Sha3([]byte(text)))
	url      = "bzz://bzzhash/my/path/contr.act"
)

func NewTestBackend() *testBackend {
	self := &testBackend{}
	self.contracts = make(map[string](map[string]string))

	self.contracts[HashRegContractAddress] = make(map[string]string)
	key := storageAddress(storageMapping(storageIdx2Addr(1), codehash[:]))
	self.contracts[HashRegContractAddress][key] = hash.Hex()

	self.contracts[URLHintContractAddress] = make(map[string]string)
	mapaddr := storageMapping(storageIdx2Addr(1), hash[:])

	key = storageAddress(storageFixedArray(mapaddr, storageIdx2Addr(0)))
	self.contracts[URLHintContractAddress][key] = common.ToHex([]byte(url))
	key = storageAddress(storageFixedArray(mapaddr, storageIdx2Addr(1)))
	self.contracts[URLHintContractAddress][key] = "0x00"

	return self
}

func (self *testBackend) StorageAt(ca, sa string) (res string) {
	c := self.contracts[ca]
	if c == nil {
		return
	}
	res = c[sa]
	return
}

func TestKeyToContentHash(t *testing.T) {
	b := NewTestBackend()
	res := New(b, URLHintContractAddress, HashRegContractAddress)

	got, err := res.KeyToContentHash(codehash)
	if err != nil {
		t.Errorf("expected no error, got %v", err)
	} else {
		if got != hash {
			t.Errorf("incorrect result, expected %x, got %x: ", hash.Hex(), got.Hex())
		}
	}
}

func TestContentHashToUrl(t *testing.T) {
	b := NewTestBackend()
	res := New(b, URLHintContractAddress, HashRegContractAddress)
	got, err := res.ContentHashToUrl(hash)
	if err != nil {
		t.Errorf("expected no error, got %v", err)
	} else {
		if string(got) != url {
			t.Errorf("incorrect result, expected %v, got %s: ", url, string(got))
		}
	}
}

func TestKeyToUrl(t *testing.T) {
	b := NewTestBackend()
	res := New(b, URLHintContractAddress, HashRegContractAddress)
	got, _, err := res.KeyToUrl(codehash)
	if err != nil {
		t.Errorf("expected no error, got %v", err)
	} else {
		if string(got) != url {
			t.Errorf("incorrect result, expected %v, got %s: ", url, string(got))
		}
	}
}