package utils

import (
	"bytes"
	"errors"
	"flag"
	"fmt"
	"io"
	"os"
	"path/filepath"
	"runtime"
	"strconv"
	"strings"
	"testing"
	"time"

	"github.com/status-im/status-go/geth/common"
	"github.com/status-im/status-go/geth/log"
	"github.com/status-im/status-go/geth/params"

	_ "github.com/stretchr/testify/suite" // required to register testify flags
)

var (
	networkSelected = flag.String("network", "statuschain", "-network=NETWORKID or -network=NETWORKNAME to select network used for tests")

	// ErrNoRemoteURL is returned when network id has no associated url.
	ErrNoRemoteURL = errors.New("network id requires a remote URL")

	// ErrTimeout is returned when test times out
	ErrTimeout = errors.New("timeout")

	// TestConfig defines the default config usable at package-level.
	TestConfig *common.TestConfig

	// RootDir is the main application directory
	RootDir string

	// TestDataDir is data directory used for tests
	TestDataDir string

	// TestNetworkNames network ID to name mapping
	TestNetworkNames = map[int]string{
		params.MainNetworkID:        "Mainnet",
		params.RopstenNetworkID:     "Ropsten",
		params.RinkebyNetworkID:     "Rinkeby",
		params.StatusChainNetworkID: "StatusChain",
	}
)

func init() {
	pwd, err := os.Getwd()
	if err != nil {
		panic(err)
	}

	flag.Parse()

	// setup root directory
	const pathSeparator = string(os.PathSeparator)
	RootDir = filepath.Dir(pwd)
	pathDirs := strings.Split(RootDir, pathSeparator)
	for i := range pathDirs {
		if pathDirs[i] == "status-go" {
			RootDir = filepath.Join(pathDirs[:i+1]...)
			RootDir = filepath.Join(pathSeparator, RootDir)
			break
		}
	}

	// setup auxiliary directories
	TestDataDir = filepath.Join(RootDir, ".ethereumtest")

	TestConfig, err = common.LoadTestConfig(GetNetworkID())
	if err != nil {
		panic(err)
	}
}

// LoadFromFile is useful for loading test data, from testdata/filename into a variable
// nolint: errcheck
func LoadFromFile(filename string) string {
	f, err := os.Open(filename)
	if err != nil {
		return ""
	}

	buf := bytes.NewBuffer(nil)
	io.Copy(buf, f) // nolint: gas
	f.Close()       // nolint: gas

	return buf.String()
}

// EnsureNodeSync waits until node synchronzation is done to continue
// with tests afterwards. Panics in case of an error or a timeout.
func EnsureNodeSync(nodeManager common.NodeManager) {
	nc, err := nodeManager.NodeConfig()
	if err != nil {
		panic("can't retrieve NodeConfig")
	}
	// Don't wait for any blockchain sync for the local private chain as blocks are never mined.
	if nc.NetworkID == params.StatusChainNetworkID {
		return
	}

	les, err := nodeManager.LightEthereumService()
	if err != nil {
		panic(err)
	}
	if les == nil {
		panic("LightEthereumService is nil")
	}

	// todo(@jeka): we should extract it into config
	timeout := time.NewTimer(50 * time.Minute)
	defer timeout.Stop()
	ticker := time.NewTicker(1 * time.Second)
	defer ticker.Stop()
	for {
		select {
		case <-timeout.C:
			panic("timeout during node synchronization")
		case <-ticker.C:
			downloader := les.Downloader()
			if downloader == nil {
				continue
			}
			if nodeManager.PeerCount() == 0 {
				log.Debug("No establishished connections with a peers, continue waiting for a sync")
				continue
			}
			if downloader.Synchronising() {
				log.Debug("synchronization is in progress")
				continue
			}
			progress := downloader.Progress()
			if progress.CurrentBlock >= progress.HighestBlock {
				return
			}
			log.Debug(
				fmt.Sprintf("synchronization is not finished yet: current block %d < highest block %d",
					progress.CurrentBlock, progress.HighestBlock),
			)

		}
	}
}

// GetRemoteURLFromNetworkID returns associated network url for giving network id.
func GetRemoteURLFromNetworkID(id int) (url string, err error) {
	switch id {
	case params.MainNetworkID:
		url = params.MainnetEthereumNetworkURL
	case params.RinkebyNetworkID:
		url = params.RinkebyEthereumNetworkURL
	case params.RopstenNetworkID:
		url = params.RopstenEthereumNetworkURL
	default:
		err = ErrNoRemoteURL
	}

	return
}

// GetHeadHashFromNetworkID returns the hash associated with a given network id.
// Mainnet is not supported for tests.
func GetHeadHashFromNetworkID(id int) string {
	switch id {
	case params.RinkebyNetworkID:
		return "0x6341fd3daf94b748c72ced5a5b26028f2474f5f00d824504e4fa37a75767e177"
	case params.RopstenNetworkID:
		return "0x41941023680923e0fe4d74a34bdac8141f2540e3ae90623718e47d66d1ca4a2d"
	case params.StatusChainNetworkID:
		return "0xe9d8920a99dc66a9557a87d51f9d14a34ec50aae04298e0f142187427d3c832e"
	}
	// Every other ID must break the test.
	panic(fmt.Sprintf("invalid network id: %d", id))
}

// GetRemoteURL returns the url associated with a given network id.
func GetRemoteURL() (string, error) {
	return GetRemoteURLFromNetworkID(GetNetworkID())
}

// GetHeadHash returns the hash associated with a given network id.
func GetHeadHash() string {
	return GetHeadHashFromNetworkID(GetNetworkID())
}

// GetNetworkID returns appropriate network id for test based on
// default or provided -network flag. Mainnet is not supported for
// tests.
func GetNetworkID() int {
	switch strings.ToLower(*networkSelected) {
	case fmt.Sprintf("%d", params.RinkebyNetworkID), "rinkeby":
		return params.RinkebyNetworkID
	case fmt.Sprintf("%d", params.RopstenNetworkID), "ropsten", "testnet":
		return params.RopstenNetworkID
	case fmt.Sprintf("%d", params.StatusChainNetworkID), "statuschain":
		return params.StatusChainNetworkID
	}
	// Every other selected network must break the test.
	panic(fmt.Sprintf("invalid selected network: %q", *networkSelected))
}

// GetAccount1PKFile returns the filename for Account1 keystore based
// on the current network. This allows running the e2e tests on the
// private network w/o access to the ACCOUNT_PASSWORD env variable
func GetAccount1PKFile() string {
	if GetNetworkID() == params.StatusChainNetworkID {
		return "test-account1-status-chain.pk"
	}
	return "test-account1.pk"
}

// GetAccount2PKFile returns the filename for Account2 keystore based
// on the current network. This allows running the e2e tests on the
// private network w/o access to the ACCOUNT_PASSWORD env variable
func GetAccount2PKFile() string {
	if GetNetworkID() == params.StatusChainNetworkID {
		return "test-account2-status-chain.pk"
	}
	return "test-account2.pk"
}

// WaitClosed used to wait on a channel in tests
func WaitClosed(c <-chan struct{}, d time.Duration) error {
	timer := time.NewTimer(d)
	defer timer.Stop()
	select {
	case <-c:
		return nil
	case <-timer.C:
		return ErrTimeout
	}
}

// MakeTestNodeConfig defines a function to return a giving params.NodeConfig
// where specific network addresses are assigned based on provided network id.
func MakeTestNodeConfig(networkID int) (*params.NodeConfig, error) {
	testDir := filepath.Join(TestDataDir, TestNetworkNames[networkID])

	if runtime.GOOS == "windows" {
		testDir = filepath.ToSlash(testDir)
	}

	// run tests with "INFO" log level only
	// when `go test` invoked with `-v` flag
	errorLevel := "ERROR"
	if testing.Verbose() {
		errorLevel = "INFO"
	}

	configJSON := `{
		"NetworkId": ` + strconv.Itoa(networkID) + `,
		"DataDir": "` + testDir + `",
		"HTTPPort": ` + strconv.Itoa(TestConfig.Node.HTTPPort) + `,
		"WSPort": ` + strconv.Itoa(TestConfig.Node.WSPort) + `,
		"LogLevel": "` + errorLevel + `"
	}`

	nodeConfig, err := params.LoadNodeConfig(configJSON)
	if err != nil {
		return nil, err
	}
	return nodeConfig, nil
}