package devnetutils

import (
	"encoding/json"
	"fmt"
	"os/exec"
	"strconv"
	"strings"

	libcommon "github.com/ledgerwatch/erigon-lib/common"

	"github.com/ledgerwatch/erigon/cmd/rpctest/rpctest"
	"github.com/ledgerwatch/erigon/common/hexutil"
	"github.com/ledgerwatch/erigon/crypto"

	"github.com/ledgerwatch/erigon/cmd/devnet/models"
)

// ClearDevDB cleans up the dev folder used for the operations
func ClearDevDB() {
	fmt.Printf("\nDeleting ./dev folders\n")

	cmd := exec.Command("rm", "-rf", "./dev0")
	err := cmd.Run()
	if err != nil {
		fmt.Println("Error occurred clearing Dev DB")
		panic("could not clear dev DB")
	}

	cmd2 := exec.Command("rm", "-rf", "./dev2")
	err2 := cmd2.Run()
	if err2 != nil {
		fmt.Println("Error occurred clearing Dev DB")
		panic("could not clear dev2 DB")
	}

	fmt.Printf("SUCCESS => Deleted ./dev0 and ./dev2\n")
}

func DeleteLogs() {
	fmt.Printf("\nRemoving old logs to create new ones...\nBefore re-running the devnet tool, make sure to copy out old logs if you need them!!!\n\n")

	cmd := exec.Command("rm", "-rf", models.LogDirParam) //nolint
	err := cmd.Run()
	if err != nil {
		fmt.Println("Error occurred removing log node_1")
		panic("could not remove old logs")
	}

	cmd2 := exec.Command("rm", "-rf", "./erigon_node_2")
	err2 := cmd2.Run()
	if err2 != nil {
		fmt.Println("Error occurred removing log node_2")
		panic("could not remove old logs")
	}
}

// UniqueIDFromEnode returns the unique ID from a node's enode, removing the `?discport=0` part
func UniqueIDFromEnode(enode string) (string, error) {
	if len(enode) == 0 {
		return "", fmt.Errorf("invalid enode string")
	}

	// iterate through characters in the string until we reach '?'
	// using index iteration because enode characters have single codepoints
	var i int
	for i < len(enode) && enode[i] != byte('?') {
		i++
	}

	// if '?' is not found in the enode, return an error
	if i == len(enode) {
		return "", fmt.Errorf("invalid enode string")
	}

	return enode[:i], nil
}

// ParseResponse converts any of the rpctest interfaces to a string for readability
func ParseResponse(resp interface{}) (string, error) {
	result, err := json.Marshal(resp)
	if err != nil {
		return "", fmt.Errorf("error trying to marshal response: %v", err)
	}

	return string(result), nil
}

// HexToInt converts a hexadecimal string to uint64
func HexToInt(hexStr string) uint64 {
	cleaned := strings.ReplaceAll(hexStr, "0x", "") // remove the 0x prefix
	result, _ := strconv.ParseUint(cleaned, 16, 64)
	return result
}

// NamespaceAndSubMethodFromMethod splits a parent method into namespace and the actual method
func NamespaceAndSubMethodFromMethod(method string) (string, string, error) {
	parts := strings.SplitN(method, "_", 2)
	if len(parts) != 2 {
		return "", "", fmt.Errorf("invalid string to split")
	}
	return parts[0], parts[1], nil
}

func HashSlicesAreEqual(s1, s2 []libcommon.Hash) bool {
	if len(s1) != len(s2) {
		return false
	}

	for i := 0; i < len(s1); i++ {
		if s1[i] != s2[i] {
			return false
		}
	}

	return true
}

func BuildLog(hash libcommon.Hash, blockNum string, address libcommon.Address, topics []libcommon.Hash, data hexutil.Bytes, txIndex hexutil.Uint, blockHash libcommon.Hash, index hexutil.Uint, removed bool) rpctest.Log {
	return rpctest.Log{
		Address:     address,
		Topics:      topics,
		Data:        data,
		BlockNumber: hexutil.Uint64(HexToInt(blockNum)),
		TxHash:      hash,
		TxIndex:     txIndex,
		BlockHash:   blockHash,
		Index:       index,
		Removed:     removed,
	}
}

func CompareLogEvents(expected, actual rpctest.Log) ([]error, bool) {
	var errs []error

	switch {
	case expected.Address != actual.Address:
		errs = append(errs, fmt.Errorf("expected address: %v, actual address %v", expected.Address, actual.Address))
	case expected.TxHash != actual.TxHash:
		errs = append(errs, fmt.Errorf("expected txhash: %v, actual txhash %v", expected.TxHash, actual.TxHash))
	case expected.BlockHash != actual.BlockHash:
		errs = append(errs, fmt.Errorf("expected blockHash: %v, actual blockHash %v", expected.BlockHash, actual.BlockHash))
	case expected.BlockNumber != actual.BlockNumber:
		errs = append(errs, fmt.Errorf("expected blockNumber: %v, actual blockNumber %v", expected.BlockNumber, actual.BlockNumber))
	case expected.TxIndex != actual.TxIndex:
		errs = append(errs, fmt.Errorf("expected txIndex: %v, actual txIndex %v", expected.TxIndex, actual.TxIndex))
	case !HashSlicesAreEqual(expected.Topics, actual.Topics):
		errs = append(errs, fmt.Errorf("expected topics: %v, actual topics %v", expected.Topics, actual.Topics))
	}

	return errs, len(errs) == 0
}

func GenerateTopic(signature string) []libcommon.Hash {
	hashed := crypto.Keccak256([]byte(signature))
	return []libcommon.Hash{libcommon.BytesToHash(hashed)}
}