package polycat

import (
	"context"
	"math/big"

	"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/ethereum/go-ethereum/core/types"
	"github.com/pkg/errors"
	"github.com/shopspring/decimal"
)

const (
	Masterchefv2Address = "0x4ce9Ae2f5983e19AebF5b8Bae4460f2B9EcE811a"
)

type Masterchefv2Service struct {
	client   evm.Client
	contract *contracts.MasterChefv2
}

func NewMasterchefv2Service(c evm.Client) (*Masterchefv2Service, error) {
	contract, err := contracts.NewMasterChefv2(common.HexToAddress(Masterchefv2Address), c)
	if err != nil {
		return nil, errors.Wrap(err, "init contract")
	}
	return &Masterchefv2Service{
		contract: contract,
		client:   c,
	}, nil
}

func (s *Masterchefv2Service) PoolInfo(pid int) (*PoolInfo, error) {
	pi, err := s.contract.PoolInfo(&bind.CallOpts{}, big.NewInt(int64(pid)))
	if err != nil {
		return nil, errors.Wrap(err, "gettting pool info")
	}
	ui, err := s.contract.UserInfo(&bind.CallOpts{}, big.NewInt(int64(pid)), s.client.PublicAddress())
	if err != nil {
		return nil, errors.Wrap(err, "getting user info")
	}
	pair, err := NewCatPair(s.client, pi.LpToken)
	if err != nil {
		return nil, errors.Wrap(err, "getting pair contract")
	}
	return &PoolInfo{
		LpToken:        pair,
		Balance:        pair.ValueFromBigInt(ui.Amount),
		TotalDeposited: pair.ValueFromBigInt(pi.TotalDeposited),
	}, nil
}

func (s *Masterchefv2Service) HarvestAll(ctx context.Context, opts ...evm.ExecutionOption) (evm.Transaction, error) {
	return s.client.Execute(ctx, func(ctx context.Context, options *evm.TransactOpts) (*types.Transaction, error) {
		return s.contract.HarvestAll(options.TransactOpts)
	}, opts...)
}

func (s *Masterchefv2Service) PendingRewards(pids []int) (decimal.Decimal, error) {
	var tot decimal.Decimal
	for _, pid := range pids {
		pr, err := s.contract.PendingPaw(&bind.CallOpts{}, big.NewInt(int64(pid)), s.client.PublicAddress())
		if err != nil {
			return decimal.Zero, errors.Wrapf(err, "getting pending reward for pid %d", pid)
		}
		tot = tot.Add(decimal.NewFromBigInt(pr, -18))
	}
	return tot, nil
}

func (s *Masterchefv2Service) Deposit(ctx context.Context, pid int, amount decimal.Decimal, opts ...evm.ExecutionOption) (evm.Transaction, error) {
	return s.client.Execute(ctx, func(ctx context.Context, options *evm.TransactOpts) (*types.Transaction, error) {
		return s.contract.Deposit(options.TransactOpts, big.NewInt(int64(pid)), amount.Shift(18).BigInt(), false)
	}, opts...)
}

func (s *Masterchefv2Service) Withdraw(ctx context.Context, pid int, amount decimal.Decimal, opts ...evm.ExecutionOption) (evm.Transaction, error) {
	return s.client.Execute(ctx, func(ctx context.Context, options *evm.TransactOpts) (*types.Transaction, error) {
		return s.contract.Withdraw(options.TransactOpts, big.NewInt(int64(pid)), amount.Shift(18).BigInt(), false)
	}, opts...)
}