// Copyright (c) 2026 Petr Balvín <opensource@petrbalvin.org> (https://petrbalvin.org)
// SPDX-License-Identifier: MIT

package signal

import (
	"fmt"
	"log"

	"sourcedock.dev/petrbalvin/tensor/internal/core"
)

func ExampleConv2D() {
	x, _ := core.FromFloats([]float64{
		1, 2, 3, 4,
		5, 6, 7, 8,
	}, 1, 1, 2, 4)
	w, _ := core.FromFloats([]float64{1, 0, 0, 1}, 1, 1, 2, 2)
	out, err := Conv2D(x, w, nil, 1, 0)
	if err != nil {
		log.Fatal(err)
	}
	fmt.Println(out)
	// Output: float (1, 1, 1, 3) [7, 9, 11]
}

func ExampleFFT() {
	x, _ := core.FromFloats([]float64{1, 1, 1, 1}, 4)
	spec, err := FFT(x)
	if err != nil {
		log.Fatal(err)
	}
	dc, _ := core.ComplexAt(spec, 0)
	fmt.Println(real(dc))
	// Output: 4
}