// Package fio fetches Fio bank transactions via the JSON API or the
// transparent-page HTML scraper, behind a common Client interface.
package fio

import (
	"context"
	"net/http"
	"time"
)

// Transaction is one incoming bank payment. Fields absent from the HTML scraper
// (BankID, Currency, UserID, SenderAccount) are empty strings on that path.
type Transaction struct {
	Date          string
	Amount        float64
	Sender        string
	Message       string
	VS            string
	KS            string
	SS            string
	UserID        string // column7; empty on HTML path
	SenderAccount string // column2; empty on HTML path
	BankID        string // column22; empty on HTML path
	Currency      string // column14; empty on HTML path (assume CZK)
}

// Client fetches transactions for a date window.
type Client interface {
	FetchTransactions(ctx context.Context, from, to time.Time) ([]Transaction, error)
}

// New returns an apiClient when token is non-empty, otherwise a transparentClient.
// hc may be nil, in which case http.DefaultClient is used.
func New(token, accountNum string, hc httpDoer) Client {
	if hc == nil {
		hc = http.DefaultClient
	}
	if token != "" {
		return &apiClient{token: token, hc: hc}
	}
	return &transparentClient{accountNum: accountNum, hc: hc}
}