package models

import "strings"

// LatestExchangeRateResponse returns a view-object which contains latest exchange rate
type LatestExchangeRateResponse struct {
	DataSource    string                  `json:"dataSource"`
	ReferenceUrl  string                  `json:"referenceUrl"`
	UpdateTime    int64                   `json:"updateTime"`
	BaseCurrency  string                  `json:"baseCurrency"`
	ExchangeRates LatestExchangeRateSlice `json:"exchangeRates"`
}

// LatestExchangeRate represents a data pair of currency and exchange rate
type LatestExchangeRate struct {
	Currency string `json:"currency"`
	Rate     string `json:"rate"`
}

// LatestExchangeRateSlice represents the slice data structure of LatestExchangeRate
type LatestExchangeRateSlice []*LatestExchangeRate

// Len returns the count of items
func (s LatestExchangeRateSlice) Len() int {
	return len(s)
}

// Swap swaps two items
func (s LatestExchangeRateSlice) Swap(i, j int) {
	s[i], s[j] = s[j], s[i]
}

// Less reports whether the first item is less than the second one
func (s LatestExchangeRateSlice) Less(i, j int) bool {
	return strings.Compare(s[i].Currency, s[j].Currency) < 0
}