tdigest

type Centroid struct {
	Mean   float64
	Weight float64
}

type CentroidsPool interface {
	// Init initializes the pool.
	Init()

	// Get provides a centroid slice from the pool.
	Get(capacity int) []Centroid

	// Put returns a centroid slice to the pool.
	Put(value []Centroid)
}

type Options interface {
	// SetCompression sets the compression.
	SetCompression(value float64) Options

	// Compression returns the compression.
	Compression() float64

	// SetPrecision sets the quantile precision.
	SetPrecision(value int) Options

	// Precision returns the quantile precision.
	Precision() int

	// SetCentroidsPool sets the centroids pool.
	SetCentroidsPool(value CentroidsPool) Options

	// CentroidsPool returns the centroids pool.
	CentroidsPool() CentroidsPool

	// Validate validates the options.
	Validate() error
}

type TDigest interface {

	// Merged returns the merged centroids.
	Merged() []Centroid

	// Unmerged returns the unmerged centroids.
	Unmerged() []Centroid

	// Add adds a value.
	Add(value float64)

	// Min returns the minimum value.
	Min() float64

	// Max returns the maximum value.
	Max() float64

	// Quantile returns the quantile value.
	Quantile(q float64) float64

	// Merge merges another t-digest.
	Merge(tdigest TDigest)

	// Close clsoes the t-digest.
	Close()

	// Reset resets the t-digest.
	Reset()
}