cost

type Event struct {
	Time     time.Time
	Provider string
	Model    string
	Input    int
	Output   int
	USD      float64
}

type Price struct {
	InputPerM  float64
	OutputPerM float64
}

type Summary struct {
	Calls  int
	Input  int
	Output int
	USD    float64
}

type Tracker struct {
	// contains filtered or unexported fields
}

type UsageRecord struct {
	Time         time.Time `json:"t"` // UTC, turn completion
	Provider     string    `json:"provider"`
	Model        string    `json:"model"`
	Input        int       `json:"in"`
	Output       int       `json:"out"`
	Cached       int       `json:"cached,omitempty"`   // cached input tokens, if reported
	USD          float64   `json:"usd,omitempty"`      // cost for this turn
	CostReported bool      `json:"reported,omitempty"` // true => provider $, false => static estimate
}

type UsageWindow struct {
	Total      Summary
	ByProvider map[string]Summary
	ByModel    map[string]Summary
	Series     []float64 // per-bucket token totals (oldest→newest) for a sparkline
	Estimated  bool      // true if any included record's cost was a static estimate
}