package main

// DONTCOVER

import (
	"bufio"
	"encoding/json"
	"fmt"
	"net"
	"os"
	"path/filepath"
	"time"

	tmconfig "github.com/cometbft/cometbft/config"
	tmos "github.com/cometbft/cometbft/libs/os"
	tmrand "github.com/cometbft/cometbft/libs/rand"
	"github.com/cometbft/cometbft/types"
	tmtime "github.com/cometbft/cometbft/types/time"
	govv1 "github.com/cosmos/cosmos-sdk/x/gov/types/v1"
	"github.com/spf13/cobra"

	"github.com/cosmos/cosmos-sdk/client"
	"github.com/cosmos/cosmos-sdk/client/flags"
	"github.com/cosmos/cosmos-sdk/client/tx"
	"github.com/cosmos/cosmos-sdk/crypto/hd"
	"github.com/cosmos/cosmos-sdk/crypto/keyring"
	cryptotypes "github.com/cosmos/cosmos-sdk/crypto/types"
	"github.com/cosmos/cosmos-sdk/server"
	srvconfig "github.com/cosmos/cosmos-sdk/server/config"
	"github.com/cosmos/cosmos-sdk/testutil"
	sdk "github.com/cosmos/cosmos-sdk/types"
	"github.com/cosmos/cosmos-sdk/types/module"
	authtypes "github.com/cosmos/cosmos-sdk/x/auth/types"
	banktypes "github.com/cosmos/cosmos-sdk/x/bank/types"
	"github.com/cosmos/cosmos-sdk/x/genutil"
	genutiltypes "github.com/cosmos/cosmos-sdk/x/genutil/types"
	govtypes "github.com/cosmos/cosmos-sdk/x/gov/types"
	stakingtypes "github.com/cosmos/cosmos-sdk/x/staking/types"

	core "github.com/classic-terra/core/v3/types"
)

var (
	flagNodeDirPrefix     = "node-dir-prefix"
	flagNumValidators     = "v"
	flagOutputDir         = "output-dir"
	flagNodeDaemonHome    = "node-daemon-home"
	flagStartingIPAddress = "starting-ip-address"
)

// get cmd to initialize all files for tendermint testnet and application
func testnetCmd(mbm module.BasicManager, genBalIterator banktypes.GenesisBalancesIterator) *cobra.Command {
	cmd := &cobra.Command{
		Use:   "testnet",
		Short: "Initialize files for a terrad testnet",
		Long: `testnet will create "v" number of directories and populate each with
necessary files (private validator, genesis, config, etc.).

Note, strict routability for addresses is turned off in the config file.

Example:
	terrad testnet --v 4 --output-dir ./output --starting-ip-address 192.168.10.2
	`,
		RunE: func(cmd *cobra.Command, _ []string) error {
			clientCtx, err := client.GetClientQueryContext(cmd)
			if err != nil {
				return err
			}
			serverCtx := server.GetServerContextFromCmd(cmd)
			config := serverCtx.Config

			outputDir, _ := cmd.Flags().GetString(flagOutputDir)
			keyringBackend, _ := cmd.Flags().GetString(flags.FlagKeyringBackend)
			chainID, _ := cmd.Flags().GetString(flags.FlagChainID)
			minGasPrices, _ := cmd.Flags().GetString(server.FlagMinGasPrices)
			nodeDirPrefix, _ := cmd.Flags().GetString(flagNodeDirPrefix)
			nodeDaemonHome, _ := cmd.Flags().GetString(flagNodeDaemonHome)
			startingIPAddress, _ := cmd.Flags().GetString(flagStartingIPAddress)
			numValidators, _ := cmd.Flags().GetInt(flagNumValidators)
			algo, _ := cmd.Flags().GetString(flags.FlagKeyType)

			return InitTestnet(
				clientCtx, cmd, config, mbm, genBalIterator, outputDir, chainID, minGasPrices,
				nodeDirPrefix, nodeDaemonHome, startingIPAddress, keyringBackend, algo, numValidators,
			)
		},
	}

	cmd.Flags().Int(flagNumValidators, 4, "Number of validators to initialize the testnet with")
	cmd.Flags().StringP(flagOutputDir, "o", "./mytestnet", "Directory to store initialization data for the testnet")
	cmd.Flags().String(flagNodeDirPrefix, "node", "Prefix the directory name for each node with (node results in node0, node1, ...)")
	cmd.Flags().String(flagNodeDaemonHome, "terrad", "Home directory of the node's daemon configuration")
	cmd.Flags().String(flagStartingIPAddress, "192.168.0.1", "Starting IP address (192.168.0.1 results in persistent peers list ID0@192.168.0.1:46656, ID1@192.168.0.2:46656, ...)")
	cmd.Flags().String(flags.FlagChainID, "", "genesis file chain-id, if left blank will be randomly created")
	cmd.Flags().String(server.FlagMinGasPrices, fmt.Sprintf("0.000006%s", core.MicroLunaDenom), "Minimum gas prices to accept for transactions; All fees in a tx must meet this minimum (e.g. 0.01photino,0.001stake)")
	cmd.Flags().String(flags.FlagKeyringBackend, flags.DefaultKeyringBackend, "Select keyring's backend (os|file|test)")
	cmd.Flags().String(flags.FlagKeyType, string(hd.Secp256k1Type), "Key signing algorithm to generate keys for")

	return cmd
}

const nodeDirPerm = 0o755

// InitTestnet initialize the testnet
func InitTestnet(
	clientCtx client.Context,
	cmd *cobra.Command,
	nodeConfig *tmconfig.Config,
	mbm module.BasicManager,
	genBalIterator banktypes.GenesisBalancesIterator,
	outputDir,
	chainID,
	minGasPrices,
	nodeDirPrefix,
	nodeDaemonHome,
	startingIPAddress,
	keyringBackend,
	algoStr string,
	numValidators int,
) error {
	if chainID == "" {
		chainID = "chain-" + tmrand.NewRand().Str(6)
	}

	nodeIDs := make([]string, numValidators)
	valPubKeys := make([]cryptotypes.PubKey, numValidators)

	_, appConfig := initAppConfig()
	terraappConfig := appConfig.(TerraAppConfig)
	terraappConfig.MinGasPrices = minGasPrices
	terraappConfig.API.Enable = true
	terraappConfig.Telemetry.Enabled = true
	terraappConfig.Telemetry.PrometheusRetentionTime = 60
	terraappConfig.Telemetry.EnableHostnameLabel = false
	terraappConfig.Telemetry.GlobalLabels = [][]string{{"chain_id", chainID}}

	var (
		genAccounts []authtypes.GenesisAccount
		genBalances []banktypes.Balance
		genFiles    []string
	)

	inBuf := bufio.NewReader(cmd.InOrStdin())
	// generate private keys, node IDs, and initial transactions

	for i := 0; i < numValidators; i++ {
		nodeDirName := fmt.Sprintf("%s%d", nodeDirPrefix, i)
		nodeDir := filepath.Join(outputDir, nodeDirName, nodeDaemonHome)
		gentxsDir := filepath.Join(outputDir, "gentxs")

		nodeConfig.SetRoot(nodeDir)
		nodeConfig.RPC.ListenAddress = "tcp://0.0.0.0:26657"

		// 1.) create testnet config dirs
		if err := os.MkdirAll(filepath.Join(nodeDir, "config"), nodeDirPerm); err != nil {
			_ = os.RemoveAll(outputDir)
			return err
		}

		// 2.) set node moniker
		nodeConfig.Moniker = nodeDirName

		// 3.) get IP for node
		ip, err := getIP(i, startingIPAddress)
		if err != nil {
			_ = os.RemoveAll(outputDir)
			return err
		}

		// 4.) create validator files
		nodeIDs[i], valPubKeys[i], err = genutil.InitializeNodeValidatorFiles(nodeConfig)
		if err != nil {
			_ = os.RemoveAll(outputDir)
			return err
		}

		memo := fmt.Sprintf("%s@%s:26656", nodeIDs[i], ip)
		genFiles = append(genFiles, nodeConfig.GenesisFile())

		kb, err := keyring.New(sdk.KeyringServiceName(), keyringBackend, nodeDir, inBuf, clientCtx.Codec)
		if err != nil {
			return err
		}

		keyringAlgos, _ := kb.SupportedAlgorithms()
		algo, err := keyring.NewSigningAlgoFromString(algoStr, keyringAlgos)
		if err != nil {
			return err
		}

		addr, secret, err := testutil.GenerateSaveCoinKey(kb, nodeDirName, "", true, algo)
		if err != nil {
			_ = os.RemoveAll(outputDir)
			return err
		}

		info := map[string]string{"secret": secret}

		cliPrint, err := json.Marshal(info)
		if err != nil {
			return err
		}

		// save private key seed words
		if err := writeFile(fmt.Sprintf("%v.json", "key_seed"), nodeDir, cliPrint); err != nil {
			return err
		}

		// create account Tokens for node
		accTokens := sdk.TokensFromConsensusPower(1000, sdk.DefaultPowerReduction)

		// create staking tokens for node
		accStakingTokens := sdk.TokensFromConsensusPower(50000, sdk.DefaultPowerReduction)

		coins := sdk.Coins{
			sdk.NewCoin(fmt.Sprintf("%stoken", nodeDirName), accTokens),
			sdk.NewCoin(core.MicroLunaDenom, accStakingTokens),
		}

		genBalances = append(genBalances, banktypes.Balance{Address: addr.String(), Coins: coins.Sort()})
		genAccounts = append(genAccounts, authtypes.NewBaseAccount(addr, nil, 0, 0))
		valTokens := sdk.TokensFromConsensusPower(100, sdk.DefaultPowerReduction)

		// create the validator for node i
		createValMsg, err := stakingtypes.NewMsgCreateValidator(
			sdk.ValAddress(addr),
			valPubKeys[i],
			sdk.NewCoin(core.MicroLunaDenom, valTokens),
			stakingtypes.NewDescription(nodeDirName, "", "", "", ""),
			stakingtypes.NewCommissionRates(sdk.OneDec(), sdk.OneDec(), sdk.OneDec()),
			sdk.OneInt(),
		)
		if err != nil {
			return err
		}

		// create gentx (create validator) and write to file
		txBuilder := clientCtx.TxConfig.NewTxBuilder()
		if err := txBuilder.SetMsgs(createValMsg); err != nil {
			return err
		}
		txBuilder.SetMemo(memo)
		txFactory := tx.Factory{}
		txFactory = txFactory.
			WithChainID(chainID).
			WithMemo(memo).
			WithKeybase(kb).
			WithTxConfig(clientCtx.TxConfig)
		if err := tx.Sign(txFactory, nodeDirName, txBuilder, true); err != nil {
			return err
		}
		txBz, err := clientCtx.TxConfig.TxJSONEncoder()(txBuilder.GetTx())
		if err != nil {
			return err
		}
		if err := writeFile(fmt.Sprintf("%v.json", nodeDirName), gentxsDir, txBz); err != nil {
			return err
		}

		// write config file app.toml
		srvconfig.WriteConfigFile(filepath.Join(nodeDir, "config/app.toml"), terraappConfig)
	}

	if err := initGenFiles(clientCtx, mbm, chainID, genAccounts, genBalances, genFiles, numValidators); err != nil {
		return err
	}

	err := collectGenFiles(
		clientCtx, nodeConfig, chainID, nodeIDs, valPubKeys, numValidators,
		outputDir, nodeDirPrefix, nodeDaemonHome, genBalIterator,
	)
	if err != nil {
		return err
	}

	cmd.PrintErrf("Successfully initialized %d node directories\n", numValidators)
	return nil
}

func initGenFiles(
	clientCtx client.Context, mbm module.BasicManager, chainID string,
	genAccounts []authtypes.GenesisAccount, genBalances []banktypes.Balance,
	genFiles []string, numValidators int,
) error {
	appGenState := mbm.DefaultGenesis(clientCtx.Codec)

	// set the accounts in the genesis state
	var authGenState authtypes.GenesisState
	clientCtx.Codec.MustUnmarshalJSON(appGenState[authtypes.ModuleName], &authGenState)

	accounts, err := authtypes.PackAccounts(genAccounts)
	if err != nil {
		return err
	}

	authGenState.Accounts = accounts
	appGenState[authtypes.ModuleName] = clientCtx.Codec.MustMarshalJSON(&authGenState)

	// set the balances in the genesis state
	var bankGenState banktypes.GenesisState
	clientCtx.Codec.MustUnmarshalJSON(appGenState[banktypes.ModuleName], &bankGenState)

	bankGenState.Balances = genBalances
	totalSupply := sdk.NewCoins()
	for _, balance := range bankGenState.Balances {
		totalSupply = totalSupply.Add(balance.Coins...)
	}
	bankGenState.Supply = totalSupply
	appGenState[banktypes.ModuleName] = clientCtx.Codec.MustMarshalJSON(&bankGenState)

	// set gov in the genesis state
	var govGenState govv1.GenesisState
	clientCtx.Codec.MustUnmarshalJSON(appGenState[govtypes.ModuleName], &govGenState)
	votingPeriod := time.Minute * 3
	govGenState.Params.VotingPeriod = &votingPeriod
	appGenState[govtypes.ModuleName] = clientCtx.Codec.MustMarshalJSON(&govGenState)

	appGenStateJSON, err := json.MarshalIndent(appGenState, "", "  ")
	if err != nil {
		return err
	}

	genDoc := types.GenesisDoc{
		ChainID:    chainID,
		AppState:   appGenStateJSON,
		Validators: nil,
	}

	// generate empty genesis files for each validator and save
	for i := 0; i < numValidators; i++ {
		if err := genDoc.SaveAs(genFiles[i]); err != nil {
			return err
		}
	}
	return nil
}

func collectGenFiles(
	clientCtx client.Context, nodeConfig *tmconfig.Config, chainID string,
	nodeIDs []string, valPubKeys []cryptotypes.PubKey, numValidators int,
	outputDir, nodeDirPrefix, nodeDaemonHome string, genBalIterator banktypes.GenesisBalancesIterator,
) error {
	var appState json.RawMessage
	genTime := tmtime.Now()

	for i := 0; i < numValidators; i++ {
		nodeDirName := fmt.Sprintf("%s%d", nodeDirPrefix, i)
		nodeDir := filepath.Join(outputDir, nodeDirName, nodeDaemonHome)
		gentxsDir := filepath.Join(outputDir, "gentxs")
		nodeConfig.Moniker = nodeDirName

		nodeConfig.SetRoot(nodeDir)

		nodeID, valPubKey := nodeIDs[i], valPubKeys[i]
		initCfg := genutiltypes.NewInitConfig(chainID, gentxsDir, nodeID, valPubKey)

		genDoc, err := types.GenesisDocFromFile(nodeConfig.GenesisFile())
		if err != nil {
			return err
		}

		nodeAppState, err := genutil.GenAppStateFromConfig(clientCtx.Codec, clientCtx.TxConfig, nodeConfig, initCfg, *genDoc, genBalIterator, genutiltypes.DefaultMessageValidator)
		if err != nil {
			return err
		}

		if appState == nil {
			// set the canonical application state (they should not differ)
			appState = nodeAppState
		}

		genFile := nodeConfig.GenesisFile()

		// overwrite each validator's genesis file to have a canonical genesis time
		if err := genutil.ExportGenesisFileWithTime(genFile, chainID, nil, appState, genTime); err != nil {
			return err
		}
	}

	return nil
}

func getIP(i int, startingIPAddr string) (ip string, err error) {
	if len(startingIPAddr) == 0 {
		ip, err = server.ExternalIP()
		if err != nil {
			return "", err
		}
		return ip, nil
	}
	return calculateIP(startingIPAddr, i)
}

func calculateIP(ip string, i int) (string, error) {
	ipv4 := net.ParseIP(ip).To4()
	if ipv4 == nil {
		return "", fmt.Errorf("%v: non ipv4 address", ip)
	}

	for j := 0; j < i; j++ {
		ipv4[3]++
	}

	return ipv4.String(), nil
}

func writeFile(name string, dir string, contents []byte) error {
	writePath := dir
	file := filepath.Join(writePath, name)

	err := tmos.EnsureDir(writePath, 0o755)
	if err != nil {
		return err
	}

	err = tmos.WriteFile(file, contents, 0o644)
	if err != nil {
		return err
	}

	return nil
}
