// Standalone waveform helpers. Apache-2.0 licensed.
module agila_open_audio

import math

pub fn sine_wave(sample_rate int, frequency f64, duration f64, amplitude f64) []i16 {
    if sample_rate <= 0 || frequency <= 0 || duration <= 0 {
        return []i16{}
    }
    count := int(f64(sample_rate) * duration)
    mut samples := []i16{cap: count}
    for i in 0 .. count {
        t := f64(i) / f64(sample_rate)
        value := math.sin(2.0 * math.pi * frequency * t) * amplitude
        samples << i16(value)
    }
    return samples
}