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

#[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
    input:  [f32; 2],
}

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

    pub const mono : &'static str =
        "Out mono\nIf set to 'Mono', ch1 will be sent to both output channels.\n(UI only)";
    pub const gain : &'static str =
        "Out gain\nThe main gain of the synthesizer output, applied to all channels. \
        Please note that this is a linear control, to prevent inaccuracies for 1.0. \
        \nRange: (0..1)";
    pub const ch1 : &'static str =
        "Out ch1\nAudio channel 1 (left)\nRange: (-1..1)";
    pub const ch2 : &'static str =
        "Out ch2\nAudio channel 2 (right)\nRange: (-1..1)";

    pub const ch3 : &'static str = "Out ch2\nAudio channel 2 (right)\nRange: (-1..1)";
    pub const ch4 : &'static str = "Out ch2\nAudio channel 2 (right)\nRange: (-1..1)";
    pub const ch5 : &'static str = "Out ch2\nAudio channel 2 (right)\nRange: (-1..1)";
    pub const ch6 : &'static str = "Out ch2\nAudio channel 2 (right)\nRange: (-1..1)";
    pub const ch7 : &'static str = "Out ch2\nAudio channel 2 (right)\nRange: (-1..1)";
    pub const ch8 : &'static str = "Out ch2\nAudio channel 2 (right)\nRange: (-1..1)";
    pub const ch9 : &'static str = "Out ch2\nAudio channel 2 (right)\nRange: (-1..1)";
    pub const ch10: &'static str = "Out ch2\nAudio channel 2 (right)\nRange: (-1..1)";
    pub const ch11: &'static str = "Out ch2\nAudio channel 2 (right)\nRange: (-1..1)";
    pub const ch12: &'static str = "Out ch2\nAudio channel 2 (right)\nRange: (-1..1)";
    pub const ch13: &'static str = "Out ch2\nAudio channel 2 (right)\nRange: (-1..1)";
    pub const ch14: &'static str = "Out ch2\nAudio channel 2 (right)\nRange: (-1..1)";
    pub const ch15: &'static str = "Out ch2\nAudio channel 2 (right)\nRange: (-1..1)";
    pub const ch16: &'static str = "Out ch2\nAudio channel 2 (right)\nRange: (-1..1)";
    pub const ch17: &'static str = "Out ch2\nAudio channel 2 (right)\nRange: (-1..1)";

    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'.
"#;
}

impl DspNode for Out {
    fn outputs() -> usize { 0 }

    fn set_sample_rate(&mut self, _srate: f32) { }
    fn reset(&mut self) { }

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

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

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

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