package ted

import "strings"

type valuedAmount struct {
	value    float64
	currency string
}

// aggregateSameCurrencyAmounts sums values only when every non-empty currency matches.
// Lots with an empty currency are included; conflicting currencies yield zero.
func aggregateSameCurrencyAmounts(amounts []valuedAmount) (total float64, currency string) {
	var refCurrency string
	for _, item := range amounts {
		if item.value <= 0 {
			continue
		}
		c := strings.TrimSpace(item.currency)
		if c == "" {
			continue
		}
		if refCurrency == "" {
			refCurrency = c
			continue
		}
		if c != refCurrency {
			return 0, ""
		}
	}

	for _, item := range amounts {
		if item.value <= 0 {
			continue
		}
		total += item.value
	}
	if total <= 0 {
		return 0, ""
	}
	return total, refCurrency
}