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// Copyright (c) 2021 Weird Constructor <weirdconstructor@gmail.com>
// This file is a part of HexoDSP. Released under GPL-3.0-or-later.
// See README.md and COPYING for details.

use crate::dsp::{
    at, denorm, inp, DspNode, GraphFun, LedPhaseVals, NodeContext, NodeGlobalRef, NodeId, ProcBuf,
    SAtom,
};
use crate::nodes::{NodeAudioContext, NodeExecContext};

#[macro_export]
macro_rules! fa_out_mono {
    ($formatter: expr, $v: expr, $denorm_v: expr) => {{
        let s = match ($v.round() as usize) {
            0 => "Stereo",
            1 => "Mono",
            _ => "?",
        };
        write!($formatter, "{}", s)
    }};
}

/// The (stereo) output port of the plugin
#[derive(Debug, Clone)]
pub struct Out {
    /// - 0: signal channel 1
    /// - 1: signal channel 2
    #[allow(dead_code)]
    input: [f32; 2],
}

impl Out {
    pub fn new(_nid: &NodeId, _node_global: &NodeGlobalRef) -> Self {
        Self { input: [0.0; 2] }
    }

    pub const mono: &'static str =
        "If set to **Mono**, ~~ch1~~ will be sent to both output channels.\n(UI only)";
    pub const vol: &'static str =
        "The main volume of the synthesizer output, applied to all channels. \
        Please note that this is a linear control, to prevent inaccuracies for **1.0**. \
        ";
    pub const ch1: &'static str = "Audio channel 1 (left)";
    pub const ch2: &'static str = "Audio channel 2 (right)";

    pub const DESC: &'static str = "Audio Output Port\n\n\
        This output port node allows you to send audio signals \
        to audio devices or tracks in your DAW.";
    pub const HELP: &'static str = r#"Audio Output Port

This output port node allows you to send audio signals to audio devices
or tracks in your DAW. If you need a stereo output but only have a mono
signal you can use the ~~mono~~ setting to duplicate the signal on the ~~ch1~~
input to the second channel ~~ch2~~.
"#;

    pub fn graph_fun() -> Option<GraphFun> {
        None
    }
}

impl DspNode for Out {
    fn set_sample_rate(&mut self, _srate: f32) {}
    fn reset(&mut self) {}

    #[inline]
    fn process(
        &mut self,
        ctx: &mut dyn NodeAudioContext,
        _ectx: &mut NodeExecContext,
        _nctx: &NodeContext,
        atoms: &[SAtom],
        inputs: &[ProcBuf],
        _outputs: &mut [ProcBuf],
        ctx_vals: LedPhaseVals,
    ) {
        let in1 = inp::Out::ch1(inputs);
        let vol = inp::Out::vol(inputs);

        if at::Out::mono(atoms).i() > 0 {
            for frame in 0..ctx.nframes() {
                let vol = denorm::Out::vol(vol, frame);
                ctx.output(0, frame, vol * in1.read(frame));
                ctx.output(1, frame, vol * in1.read(frame));
            }
        } else {
            let in2 = inp::Out::ch2(inputs);

            for frame in 0..ctx.nframes() {
                let vol = denorm::Out::vol(vol, frame);
                ctx.output(0, frame, vol * in1.read(frame));
                ctx.output(1, frame, vol * in2.read(frame));
            }
        }

        let last_val = in1.read(ctx.nframes() - 1);
        ctx_vals[0].set(last_val);
    }
}