// Copyright 2022 Evmos Foundation
// This file is part of the Evmos Network packages.
//
// Evmos is free software: you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// The Evmos packages are distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public License
// along with the Evmos packages. If not, see https://github.com/evmos/evmos/blob/main/LICENSE

package types

import (
	"github.com/cometbft/cometbft/crypto/tmhash"
	sdk "github.com/cosmos/cosmos-sdk/types"
	"github.com/ethereum/go-ethereum/common"
	evmostypes "github.com/evmos/evmos/v15/types"
)

// NewTokenPair returns an instance of TokenPair
func NewTokenPair(erc20Address common.Address, denom string, contractOwner Owner) TokenPair {
	return TokenPair{
		Erc20Address:  erc20Address.String(),
		Denom:         denom,
		Enabled:       true,
		ContractOwner: contractOwner,
	}
}

// GetID returns the SHA256 hash of the ERC20 address and denomination
func (tp TokenPair) GetID() []byte {
	id := tp.Erc20Address + "|" + tp.Denom
	return tmhash.Sum([]byte(id))
}

// GetErc20Contract casts the hex string address of the ERC20 to common.Address
func (tp TokenPair) GetERC20Contract() common.Address {
	return common.HexToAddress(tp.Erc20Address)
}

// Validate performs a stateless validation of a TokenPair
func (tp TokenPair) Validate() error {
	if err := sdk.ValidateDenom(tp.Denom); err != nil {
		return err
	}

	return evmostypes.ValidateAddress(tp.Erc20Address)
}

// IsNativeCoin returns true if the owner of the ERC20 contract is the
// erc20 module account
func (tp TokenPair) IsNativeCoin() bool {
	return tp.ContractOwner == OWNER_MODULE
}

// IsNativeERC20 returns true if the owner of the ERC20 contract not the
// erc20 module account
func (tp TokenPair) IsNativeERC20() bool {
	return tp.ContractOwner == OWNER_EXTERNAL
}
