package mutations

import (
	"context"

	gql "github.com/llehouerou/go-graphql-client"
	"github.com/pkg/errors"
	"github.com/shopspring/decimal"

	"git.lehouerou.net/laurent/sorare/graphql"
	"git.lehouerou.net/laurent/sorare/types"
)

type bidInput struct {
	Approvals        []AuthorizationApprovalInput `json:"approvals"`
	AuctionId        string                       `json:"auctionId"`
	Amount           decimal.Decimal              `json:"amount"`
	SettlementInfo   SettlementInfo               `json:"settlementInfo"`
	ClientMutationId string                       `json:"clientMutationId"`
}

type BidPayload struct {
	Bid struct {
		Id graphql.Id `graphql:"id"`
	} `graphql:"bid"`
	BaseMutationPayload
}

type BidParams struct {
	Input bidInput `graphql:"input"`
}

func (m *Mutations) newBidMutation() *graphql.Mutation[BidPayload, BidParams] {
	return graphql.NewMutation[BidPayload, BidParams](m.c, "bid")
}

type BidOptions struct {
	PaymentMethod types.PaymentMethod
}

func WithBidPaymentMethod(paymentMethod types.PaymentMethod) func(*BidOptions) {
	return func(o *BidOptions) {
		o.PaymentMethod = paymentMethod
	}
}

func (m *Mutations) BidOnAuction(
	ctx context.Context,
	auctionId string,
	amount decimal.Decimal,
	currency types.SupportedCurrency,
	privateKey string,
	options ...func(*BidOptions),
) (string, error) {

	opts := BidOptions{
		PaymentMethod: types.PaymentMethodWallet,
	}
	for _, opt := range options {
		opt(&opts)
	}
	exchangeRate, err := m.ExchangeRate.Get(ctx, graphql.EmptyParams{})
	if err != nil {
		return "", errors.Wrap(err, "getting exchange rate")
	}
	si := SettlementInfo{
		Currency:       currency,
		PaymentMethod:  opts.PaymentMethod,
		ExchangeRateId: exchangeRate.Id.String(),
	}
	currencyShift := 2
	if currency == types.SupportedCurrencyWEI {
		currencyShift = 18
	}
	amount = amount.Shift(int32(currencyShift))

	prepareBidRes, err := m.newPrepareBidMutation().Execute(ctx, PrepareBidParams{
		Input: prepareBidInput{
			AuctionId:      gql.ID(auctionId),
			Amount:         amount,
			SettlementInfo: si,
		}})
	if err != nil {
		return "", errors.Wrap(err, "preparing bid")
	}
	if len(prepareBidRes.Errors) > 0 {
		return "", errors.Wrap(errors.New(prepareBidRes.Errors[0].Message), "preparing bid")
	}

	approvals, err := signAuthorizationRequests(
		privateKey,
		prepareBidRes.Authorizations,
	)
	if err != nil {
		return "", errors.Wrap(err, "signing authorization requests")
	}

	bidRes, err := m.newBidMutation().Execute(ctx, BidParams{
		Input: bidInput{
			Approvals:        approvals,
			AuctionId:        auctionId,
			Amount:           amount,
			SettlementInfo:   si,
			ClientMutationId: GetRandomId(),
		}})
	if err != nil {
		return "", errors.Wrap(err, "placing bid")
	}
	if len(bidRes.Errors) > 0 {
		return "", errors.Wrap(errors.New(bidRes.Errors[0].Message), "placing bid")
	}
	return bidRes.Bid.Id.String(), nil
}