// 🌊 외부 실시간 신호 및 파동 주입 모듈 (src/live_streamer.rs)
use std::f32::consts::PI;

pub struct LiveSignalStreamer {
    pub time: f32,
    pub frequency: f32,
}

impl LiveSignalStreamer {
    pub fn new(freq: f32) -> Self {
        LiveSignalStreamer { time: 0.0, frequency: freq }
    }

    /// 실시간 시계열 고조파(Harmonics) 신호 생성
    pub fn generate_harmonic_wave(&mut self, size: usize) -> Vec<f32> {
        self.time += 0.05;
        let mut wave = Vec::with_capacity(size * size);
        for y in 0..size {
            for x in 0..size {
                let dx = (x as f32) / (size as f32) * 2.0 - 1.0;
                let dy = (y as f32) / (size as f32) * 2.0 - 1.0;
                let dist = (dx * dx + dy * dy).sqrt();
                
                // 중심에서 퍼져나가는 사인파 + 고주파 간섭
                let signal = (dist * self.frequency * 2.0 * PI - self.time * 5.0).sin() * 0.8;
                wave.push(signal);
            }
        }
        wave
    }

    /// 특정 좌표에 순간적인 외부 에너지 충격파(Impulse) 주입
    pub fn inject_shockwave(grid: &mut [f32], size: usize, center_x: usize, center_y: usize, energy: f32) {
        if center_x < size && center_y < size {
            let idx = center_y * size + center_x;
            grid[idx] += energy;
        }
    }
}