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package utils
import (
"errors"
)
type HistoryBuffer[T any] struct {
maxSize int
items []T
}
func NewHistoryBuffer[T any](maxSize int) *HistoryBuffer[T] {
return &HistoryBuffer[T]{
maxSize: maxSize,
items: make([]T, 0, maxSize),
}
}
func (self *HistoryBuffer[T]) Push(item T) {
if len(self.items) == self.maxSize {
self.items = self.items[:len(self.items)-1]
}
self.items = append([]T{item}, self.items...)
}
func (self *HistoryBuffer[T]) PeekAt(index int) (T, error) {
var item T
if len(self.items) == 0 {
return item, errors.New("Buffer is empty")
}
if len(self.items) <= index || index < -1 {
return item, errors.New("Index out of range")
}
if index == -1 {
return item, nil
}
return self.items[index], nil
}
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