package polycat

import (
	"git.lehouerou.net/laurent/evm"
	"git.lehouerou.net/laurent/evm/polycat/contracts"
	"github.com/ethereum/go-ethereum/accounts/abi/bind"
	"github.com/ethereum/go-ethereum/common"
	"github.com/pkg/errors"
	"github.com/shopspring/decimal"
)

type CatPair struct {
	evm.Token
	paircontract *contracts.CatPair
}

func NewCatPair(client evm.Client, address common.Address) (*CatPair, error) {
	t, err := client.TokenService().TokenByAddress(address)
	if err != nil {
		return nil, errors.Wrap(err, "init contract")
	}

	pc, err := contracts.NewCatPair(address, client)
	if err != nil {
		return nil, errors.Wrap(err, "init pair contract")
	}

	return &CatPair{
		Token:        t,
		paircontract: pc,
	}, nil
}

func (p *CatPair) GetReserves() (decimal.Decimal, decimal.Decimal, error) {
	res, err := p.paircontract.GetReserves(&bind.CallOpts{})
	if err != nil {
		return decimal.Zero, decimal.Zero, errors.Wrap(err, "calling pair contract")
	}
	return p.ValueFromBigInt(res.Reserve0), p.ValueFromBigInt(res.Reserve1), nil
}

func (p *CatPair) getToken0() (evm.Token, error) {
	t0address, err := p.paircontract.Token0(&bind.CallOpts{})
	if err != nil {
		return nil, errors.Wrap(err, "getting token0 address")
	}
	t0, err := p.Client().TokenService().TokenByAddress(t0address)
	if err != nil {
		return nil, errors.Wrap(err, "getting token0 contract")
	}
	return t0, nil
}

func (p *CatPair) getToken1() (evm.Token, error) {
	t1address, err := p.paircontract.Token0(&bind.CallOpts{})
	if err != nil {
		return nil, errors.Wrap(err, "getting token1 address")
	}
	t1, err := p.Client().TokenService().TokenByAddress(t1address)
	if err != nil {
		return nil, errors.Wrap(err, "getting token1 contract")
	}
	return t1, nil
}