package cmd

import (
	"math/big"

	"github.com/nspcc-dev/neo-go/pkg/encoding/fixedn"
	internalclient "github.com/nspcc-dev/neofs-node/cmd/neofs-cli/internal/client"
	"github.com/nspcc-dev/neofs-node/cmd/neofs-cli/internal/common"
	"github.com/nspcc-dev/neofs-node/cmd/neofs-cli/internal/commonflags"
	"github.com/nspcc-dev/neofs-node/pkg/util/precision"
	"github.com/nspcc-dev/neofs-sdk-go/accounting"
	"github.com/nspcc-dev/neofs-sdk-go/owner"
	"github.com/spf13/cobra"
	"github.com/spf13/viper"
)

var (
	balanceOwner string
)

// accountingCmd represents the accounting command
var accountingCmd = &cobra.Command{
	Use:   "accounting",
	Short: "Operations with accounts and balances",
	Long:  `Operations with accounts and balances`,
	PersistentPreRun: func(cmd *cobra.Command, args []string) {
		flags := cmd.Flags()

		_ = viper.BindPFlag(commonflags.WalletPath, flags.Lookup(commonflags.WalletPath))
		_ = viper.BindPFlag(commonflags.Account, flags.Lookup(commonflags.Account))
		_ = viper.BindPFlag(commonflags.RPC, flags.Lookup(commonflags.RPC))
	},
}

var accountingBalanceCmd = &cobra.Command{
	Use:   "balance",
	Short: "Get internal balance of NeoFS account",
	Long:  `Get internal balance of NeoFS account`,
	Run: func(cmd *cobra.Command, args []string) {
		var oid *owner.ID

		key, err := getKey()
		common.ExitOnErr(cmd, "", err)

		if balanceOwner == "" {
			oid = owner.NewIDFromPublicKey(&key.PublicKey)
		} else {
			oid, err = ownerFromString(balanceOwner)
			common.ExitOnErr(cmd, "", err)
		}

		var prm internalclient.BalanceOfPrm

		prepareAPIClientWithKey(cmd, key, &prm)
		prm.SetAccount(*oid)

		res, err := internalclient.BalanceOf(prm)
		common.ExitOnErr(cmd, "rpc error: %w", err)

		// print to stdout
		prettyPrintDecimal(cmd, res.Balance())
	},
}

func initAccountingBalanceCmd() {
	ff := accountingBalanceCmd.Flags()

	ff.StringP(commonflags.WalletPath, commonflags.WalletPathShorthand, commonflags.WalletPathDefault, commonflags.WalletPathUsage)
	ff.StringP(commonflags.Account, commonflags.AccountShorthand, commonflags.AccountDefault, commonflags.AccountUsage)
	ff.StringP(commonflags.RPC, commonflags.RPCShorthand, commonflags.RPCDefault, commonflags.RPCUsage)

	accountingBalanceCmd.Flags().StringVar(&balanceOwner, "owner", "", "owner of balance account (omit to use owner from private key)")
}

func init() {
	rootCmd.AddCommand(accountingCmd)
	accountingCmd.AddCommand(accountingBalanceCmd)

	// Here you will define your flags and configuration settings.

	// Cobra supports Persistent Flags which will work for this command
	// and all subcommands, e.g.:
	// accountingCmd.PersistentFlags().String("foo", "", "A help for foo")

	// Cobra supports local flags which will only run when this command
	// is called directly, e.g.:
	// accountingCmd.Flags().BoolP("toggle", "t", false, "Help message for toggle")

	initAccountingBalanceCmd()
}

func prettyPrintDecimal(cmd *cobra.Command, decimal *accounting.Decimal) {
	if decimal == nil {
		return
	}

	if viper.GetBool(commonflags.Verbose) {
		cmd.Println("value:", decimal.Value())
		cmd.Println("precision:", decimal.Precision())
	} else {
		amountF8 := precision.Convert(decimal.Precision(), 8, big.NewInt(decimal.Value()))

		cmd.Println(fixedn.ToString(amountF8, 8))
	}
}