// Sound effect dispatch: turns game sound events into positioned effect voices
// (volume by distance to the camera, stereo panning along the screen's x axis).
// The audio itself is rendered by audio.rs.

use crate::audio;
use crate::game::{Sfx, SfxEvent, SFX_ALL};
use macroquad::prelude::*;

pub struct SoundBank {
    last: Vec<f64>,
}

impl SoundBank {
    pub fn new() -> SoundBank {
        SoundBank { last: vec![-1.0; SFX_ALL.len()] }
    }

    // minimum gap between two identical sounds (avoids a wall of noise)
    fn min_gap(sfx: Sfx) -> f64 {
        match sfx {
            Sfx::Dig | Sfx::GoldDig | Sfx::MeleeHit | Sfx::Shoot | Sfx::GateHit | Sfx::CoreHit => 0.08,
            Sfx::Claim | Sfx::Deposit | Sfx::DigDone => 0.12,
            _ => 0.03,
        }
    }

    // listener: camera target on the ground; right: screen-right direction on the ground;
    // hear: audible radius in tiles
    pub fn play(&mut self, ev: SfxEvent, listener: Vec2, right: Vec2, hear: f32, now: f64) {
        let i = ev.sfx.index();
        if now - self.last[i] < Self::min_gap(ev.sfx) {
            return;
        }
        let mut vol = 1.0;
        let mut pan = 0.0;
        if let Some((wx, wy)) = ev.pos {
            let d = vec2(wx, wy) - listener;
            let f = 1.0 - ((d.length() - hear * 0.5) / hear).clamp(0.0, 1.0);
            if f <= 0.05 {
                return;
            }
            vol *= f;
            pan = (d.dot(right) / hear).clamp(-1.0, 1.0) * 0.7;
        }
        self.last[i] = now;
        audio::play_sfx(i, vol, pan);
    }
}