package cgo

/*
#cgo CFLAGS: -march=native -Ofast -std=c99
#include "lemire.h"
*/
import "C"
import (
	"fmt"
	"unsafe"
)

type LemireMaxClampedFilter struct {
	ptr *C.LemireMaxClampedFilter
}

func NewLemireMaxClampedFilter(windowSize, dataLength int) (*LemireMaxClampedFilter, error) {
	ob := &LemireMaxClampedFilter{
		ptr: C.lemire_max_clamped_init(C.int(windowSize), C.int(dataLength)),
	}
	if ob.ptr == nil {
		return nil, fmt.Errorf("windowSize should be odd when clamping edges, it is even")
	}

	return ob, nil
}

func (l *LemireMaxClampedFilter) Filter(data, max []float32) {
	C.lemire_max_clamped_filter(l.ptr, (*C.float)(unsafe.SliceData(data)), C.size_t(len(data)), (*C.float)(unsafe.SliceData(max)))
}

func (l *LemireMaxClampedFilter) Close() {
	C.lemire_max_clamped_free(l.ptr)
	l.ptr = nil
}