payments/ce/plugins/mangopay/accounts.go

package mangopay

import (
	"context"
	"encoding/json"
	"time"

	"github.com/hanzo-fi/go-libs/v5/pkg/types/pointer"
	"github.com/hanzo-fi/go-libs/v5/pkg/types/currency"
	"github.com/hanzo-fi/payments/ce/plugins/mangopay/client"
	"github.com/hanzo-fi/payments/pkg/domain/models"
	"github.com/hanzo-fi/payments/pkg/domain/pagination"
)

type accountsState struct {
	LastPage         int       `json:"lastPage"`
	LastCreationDate time.Time `json:"lastCreationDate"`
}

func (p *Plugin) fetchNextAccounts(ctx context.Context, req models.FetchNextAccountsRequest) (models.FetchNextAccountsResponse, error) {
	var oldState accountsState
	if req.State != nil {
		if err := json.Unmarshal(req.State, &oldState); err != nil {
			return models.FetchNextAccountsResponse{}, err
		}
	} else {
		oldState = accountsState{
			LastPage: 1,
		}
	}

	var from client.User
	if req.FromPayload == nil {
		return models.FetchNextAccountsResponse{}, models.ErrMissingFromPayloadInRequest
	}
	if err := json.Unmarshal(req.FromPayload, &from); err != nil {
		return models.FetchNextAccountsResponse{}, err
	}

	newState := accountsState{
		LastPage:         oldState.LastPage,
		LastCreationDate: oldState.LastCreationDate,
	}

	var accounts []models.PSPAccount
	needMore := false
	hasMore := false
	page := oldState.LastPage
	for {
		pagedAccounts, err := p.client.GetWallets(ctx, from.ID, page, req.PageSize)
		if err != nil {
			return models.FetchNextAccountsResponse{}, err
		}

		accounts, err = fillAccounts(pagedAccounts, accounts, from, oldState)
		if err != nil {
			return models.FetchNextAccountsResponse{}, err
		}

		needMore, hasMore = pagination.ShouldFetchMore(accounts, pagedAccounts, req.PageSize)
		if !needMore || !hasMore {
			break
		}

		page++
	}

	if !needMore {
		accounts = accounts[:req.PageSize]
	}

	if len(accounts) > 0 {
		newState.LastCreationDate = accounts[len(accounts)-1].CreatedAt
	}

	newState.LastPage = page

	payload, err := json.Marshal(newState)
	if err != nil {
		return models.FetchNextAccountsResponse{}, err
	}

	return models.FetchNextAccountsResponse{
		Accounts: accounts,
		NewState: payload,
		HasMore:  hasMore,
	}, nil
}

func fillAccounts(
	pagedAccounts []client.Wallet,
	accounts []models.PSPAccount,
	from client.User,
	oldState accountsState,
) ([]models.PSPAccount, error) {
	for _, account := range pagedAccounts {
		accountCreationDate := time.Unix(account.CreationDate, 0)
		if accountCreationDate.Before(oldState.LastCreationDate) {
			continue
		}

		raw, err := json.Marshal(account)
		if err != nil {
			return nil, err
		}

		accounts = append(accounts, models.PSPAccount{
			Reference:    account.ID,
			CreatedAt:    accountCreationDate,
			Name:         &account.Description,
			DefaultAsset: pointer.For(currency.FormatAsset(supportedCurrenciesWithDecimal, account.Currency)),
			Metadata: map[string]string{
				userIDMetadataKey: from.ID,
			},
			Raw: raw,
		})
	}

	return accounts, nil
}