package commands

import (
	"encoding/hex"
	"fmt"

	"github.com/spf13/cobra"
	"github.com/spf13/viper"

	crypto "github.com/tendermint/go-crypto"

	"github.com/cosmos/cosmos-sdk/client/context"
	sdk "github.com/cosmos/cosmos-sdk/types"
	"github.com/cosmos/cosmos-sdk/wire"
	authcmd "github.com/cosmos/cosmos-sdk/x/auth/commands"
	"github.com/cosmos/cosmos-sdk/x/stake"
)

// create declare candidacy command
func GetCmdDeclareCandidacy(cdc *wire.Codec) *cobra.Command {
	cmd := &cobra.Command{
		Use:   "declare-candidacy",
		Short: "create new validator-candidate account and delegate some coins to it",
		RunE: func(cmd *cobra.Command, args []string) error {
			amount, err := sdk.ParseCoin(viper.GetString(FlagAmount))
			if err != nil {
				return err
			}
			candidateAddr, err := sdk.GetAddress(viper.GetString(FlagAddressCandidate))
			if err != nil {
				return err
			}

			pkStr := viper.GetString(FlagPubKey)
			if len(pkStr) == 0 {
				return fmt.Errorf("must use --pubkey flag")
			}
			pkBytes, err := hex.DecodeString(pkStr)
			if err != nil {
				return err
			}
			pk, err := crypto.PubKeyFromBytes(pkBytes)
			if err != nil {
				return err
			}

			if viper.GetString(FlagMoniker) == "" {
				return fmt.Errorf("please enter a moniker for the validator-candidate using --moniker")
			}
			description := stake.Description{
				Moniker:  viper.GetString(FlagMoniker),
				Identity: viper.GetString(FlagIdentity),
				Website:  viper.GetString(FlagWebsite),
				Details:  viper.GetString(FlagDetails),
			}
			msg := stake.NewMsgDeclareCandidacy(candidateAddr, pk, amount, description)

			// build and sign the transaction, then broadcast to Tendermint
			ctx := context.NewCoreContextFromViper().WithDecoder(authcmd.GetAccountDecoder(cdc))

			res, err := ctx.EnsureSignBuildBroadcast(ctx.FromAddressName, msg, cdc)
			if err != nil {
				return err
			}

			fmt.Printf("Committed at block %d. Hash: %s\n", res.Height, res.Hash.String())
			return nil
		},
	}

	cmd.Flags().AddFlagSet(fsPk)
	cmd.Flags().AddFlagSet(fsAmount)
	cmd.Flags().AddFlagSet(fsDescription)
	cmd.Flags().AddFlagSet(fsCandidate)
	return cmd
}

// create edit candidacy command
func GetCmdEditCandidacy(cdc *wire.Codec) *cobra.Command {
	cmd := &cobra.Command{
		Use:   "edit-candidacy",
		Short: "edit and existing validator-candidate account",
		RunE: func(cmd *cobra.Command, args []string) error {

			candidateAddr, err := sdk.GetAddress(viper.GetString(FlagAddressCandidate))
			if err != nil {
				return err
			}
			description := stake.Description{
				Moniker:  viper.GetString(FlagMoniker),
				Identity: viper.GetString(FlagIdentity),
				Website:  viper.GetString(FlagWebsite),
				Details:  viper.GetString(FlagDetails),
			}
			msg := stake.NewMsgEditCandidacy(candidateAddr, description)

			// build and sign the transaction, then broadcast to Tendermint
			ctx := context.NewCoreContextFromViper().WithDecoder(authcmd.GetAccountDecoder(cdc))

			res, err := ctx.EnsureSignBuildBroadcast(ctx.FromAddressName, msg, cdc)
			if err != nil {
				return err
			}

			fmt.Printf("Committed at block %d. Hash: %s\n", res.Height, res.Hash.String())
			return nil
		},
	}

	cmd.Flags().AddFlagSet(fsDescription)
	cmd.Flags().AddFlagSet(fsCandidate)
	return cmd
}

// create edit candidacy command
func GetCmdDelegate(cdc *wire.Codec) *cobra.Command {
	cmd := &cobra.Command{
		Use:   "delegate",
		Short: "delegate coins to an existing validator/candidate",
		RunE: func(cmd *cobra.Command, args []string) error {
			amount, err := sdk.ParseCoin(viper.GetString(FlagAmount))
			if err != nil {
				return err
			}

			delegatorAddr, err := sdk.GetAddress(viper.GetString(FlagAddressDelegator))
			candidateAddr, err := sdk.GetAddress(viper.GetString(FlagAddressCandidate))
			if err != nil {
				return err
			}

			msg := stake.NewMsgDelegate(delegatorAddr, candidateAddr, amount)

			// build and sign the transaction, then broadcast to Tendermint
			ctx := context.NewCoreContextFromViper().WithDecoder(authcmd.GetAccountDecoder(cdc))

			res, err := ctx.EnsureSignBuildBroadcast(ctx.FromAddressName, msg, cdc)
			if err != nil {
				return err
			}

			fmt.Printf("Committed at block %d. Hash: %s\n", res.Height, res.Hash.String())
			return nil
		},
	}

	cmd.Flags().AddFlagSet(fsAmount)
	cmd.Flags().AddFlagSet(fsDelegator)
	cmd.Flags().AddFlagSet(fsCandidate)
	return cmd
}

// create edit candidacy command
func GetCmdUnbond(cdc *wire.Codec) *cobra.Command {
	cmd := &cobra.Command{
		Use:   "unbond",
		Short: "unbond coins from a validator/candidate",
		RunE: func(cmd *cobra.Command, args []string) error {

			// check the shares before broadcasting
			sharesStr := viper.GetString(FlagShares)
			var shares sdk.Rat
			if sharesStr != "MAX" {
				var err error
				shares, err = sdk.NewRatFromDecimal(sharesStr)
				if err != nil {
					return err
				}
				if !shares.GT(sdk.ZeroRat) {
					return fmt.Errorf("shares must be positive integer or decimal (ex. 123, 1.23456789)")
				}
			}

			delegatorAddr, err := sdk.GetAddress(viper.GetString(FlagAddressDelegator))
			candidateAddr, err := sdk.GetAddress(viper.GetString(FlagAddressCandidate))
			if err != nil {
				return err
			}

			msg := stake.NewMsgUnbond(delegatorAddr, candidateAddr, sharesStr)

			// build and sign the transaction, then broadcast to Tendermint
			ctx := context.NewCoreContextFromViper().WithDecoder(authcmd.GetAccountDecoder(cdc))

			res, err := ctx.EnsureSignBuildBroadcast(ctx.FromAddressName, msg, cdc)
			if err != nil {
				return err
			}

			fmt.Printf("Committed at block %d. Hash: %s\n", res.Height, res.Hash.String())
			return nil
		},
	}

	cmd.Flags().AddFlagSet(fsShares)
	cmd.Flags().AddFlagSet(fsDelegator)
	cmd.Flags().AddFlagSet(fsCandidate)
	return cmd
}