package evm

import (
	"fmt"

	sdk "github.com/cosmos/cosmos-sdk/types"
	"github.com/cosmos/ethermint/x/evm/types"
)

// NewHandler returns a handler for Ethermint type messages.
func NewHandler(keeper Keeper) sdk.Handler {
	return func(ctx sdk.Context, msg sdk.Msg) sdk.Result {
		switch msg := msg.(type) {
		case types.EthereumTxMsg:
			return handleETHTxMsg(ctx, keeper, msg)
		default:
			errMsg := fmt.Sprintf("Unrecognized ethermint Msg type: %v", msg.Type())
			return sdk.ErrUnknownRequest(errMsg).Result()
		}
	}
}

// Handle an Ethereum specific tx
func handleETHTxMsg(ctx sdk.Context, keeper Keeper, msg types.EthereumTxMsg) sdk.Result {
	// TODO: Implement transaction logic
	if err := msg.ValidateBasic(); err != nil {
		return sdk.ErrUnknownRequest("Basic validation failed").Result()
	}

	// If no to address, create contract with evm.Create(...)

	// Else Call contract with evm.Call(...)

	// handle errors

	// Refund remaining gas from tx (Will supply keeper need to be introduced to evm Keeper to do this)

	// add balance for the processor of the tx (determine who rewards are being processed to)

	return sdk.Result{}
}