package economics

import "time"

// Bill sources.
const (
	SourceManual       = "manual"
	SourceCostExplorer = "costexplorer"
)

// Bill is economics/bills/<month>.json — the real AWS bill for one month,
// whole-account by-service (attribution to CARLOS is a dashboard knob, not
// a pull-time filter — both AWS accounts hold non-CARLOS resources).
type Bill struct {
	Schema   int                `json:"schema"` // 1
	Month    string             `json:"month"`  // "2006-01"
	TotalUSD float64            `json:"total_usd"`
	Services map[string]float64 `json:"services"`
	Source   string             `json:"source"` // SourceManual | SourceCostExplorer
	// PulledAt uses omitzero, not omitempty: encoding/json's omitempty never
	// treats a zero time.Time as empty (it isn't a nil/0/"" by the encoder's
	// own rule), so a manually-entered bill — which never sets this field —
	// would otherwise marshal a lying "0001-01-01T00:00:00Z" pulled_at key.
	PulledAt time.Time `json:"pulled_at,omitzero"`
}

// BillsPrefix lists stored bills.
const BillsPrefix = "economics/bills/"

// BillKey is the bucket key for a month's bill.
func BillKey(month string) string { return BillsPrefix + month + ".json" }