package rds

import (
	"math"
	"testing"
)

func TestEncoderGenerate(t *testing.T) {
	cfg := DefaultConfig()
	enc, err := NewEncoder(cfg)
	if err != nil {
		t.Fatalf("unexpected error: %v", err)
	}

	samples := enc.Generate(128)
	if len(samples) != 128 {
		t.Fatalf("expected 128 samples, got %d", len(samples))
	}

	var max float64
	var sum float64
	for _, s := range samples {
		sum += math.Abs(s)
		if math.Abs(s) > max {
			max = math.Abs(s)
		}
	}

	if sum == 0 {
		t.Fatalf("expected non-zero samples")
	}

	if max > 0.1 {
		t.Fatalf("samples exceed configured amplitude: %v", max)
	}
}

func TestEncoderReset(t *testing.T) {
	cfg := DefaultConfig()
	enc, err := NewEncoder(cfg)
	if err != nil {
		t.Fatalf("unexpected error: %v", err)
	}

	sampleA := enc.Generate(1)[0]
	enc.Generate(10)
	enc.Reset()
	if sampleB := enc.Generate(1)[0]; math.Abs(sampleA-sampleB) > 1e-9 {
		t.Fatalf("expected reset to replay initial sample: %v vs %v", sampleA, sampleB)
	}
}