/*
   Peacock-8 VA polysynth

   Copyright 2025 Gordon JC Pearce <gordonjcp@gjcp.net>

   Permission to use, copy, modify, and/or distribute this software for any
   purpose with or without fee is hereby granted, provided that the above
   copyright notice and this permission notice appear in all copies.

   THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
   WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
   MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
   SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
   WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
   OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
   CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/

#ifndef _MODULE_HPP
#define _MODULE_HPP

#include <stdint.h>

#include "DistrhoPluginInfo.h"
#include "chorus.hpp"

extern double sampleRate;

class Voice;

class Module {
   public:
    Module();
    ~Module();

    void genNoise();
    void lfoRampOn();
    void run(Voice* voices, uint32_t blockLeft);

    float res = 0;

    // "internal state" values for patch parameters
    uint16_t a, d, s, r;

    float saw = 0, square = 0, sub = 0, noise = 0, master = 0;

    /*
    #if 0
        struct {
            uint8_t lfoRate = 0x58;
            uint8_t lfoDelay = 0x00;
            uint8_t vcoLfo = 0x00;
            uint8_t pwmLfo = 0x3b;
            uint8_t noise = 0x00;
            uint8_t vcfFreq = 0x25;  // 1c;  // 0x3f80
            uint8_t vcfReso = 0x6a;
            uint8_t vcfEnv = 0x25;  // 4e;
            uint8_t vcfLfo = 0x00;
            uint8_t vcfKey = 0x00;  // 47;
            uint8_t vca = 0x35;
            uint8_t env_a = 0x00;
            uint8_t env_d = 0x3c;
            uint8_t env_s = 0x00;  // 0x3f80
            uint8_t env_r = 0x3c;
            uint8_t sub = 0x7f;
            uint8_t switch1 = 0x4a;
            uint8_t switch2 = 0x18;
        } patchRam;

    #else
        struct {
            uint8_t lfoRate = 0x40;
            uint8_t lfoDelay = 0x00;
            uint8_t vcoLfo = 0x00;
            uint8_t pwmLfo = 0x00;
            uint8_t noise = 0x01;
            uint8_t vcfFreq = 0x31;
            uint8_t vcfReso = 0x7f;
            uint8_t vcfEnv = 0x00;
            uint8_t vcfLfo = 0x00;
            uint8_t vcfKey = 0x7f;
            uint8_t vca = 0x40;
            uint8_t env_a = 0x00;
            uint8_t env_d = 0x00;
            uint8_t env_s = 0x00;  // 0x3f80
            uint8_t env_r = 0x00;
            uint8_t sub = 0x00;
            uint8_t switch1 = 0x22;
            uint8_t switch2 = 0x1d;
        } patchRam;
    #endif
    */

    struct {
        uint8_t lfoRate = 0x1f;
        uint8_t lfoDelay = 0x00;
        uint8_t vcoLfo = 0x00;
        uint8_t pwmLfo = 0x3c;
        uint8_t noise = 0x00;
        uint8_t vcfFreq = 0x25;  // 1c;  // 0x3f80
        uint8_t vcfReso = 0x1d;
        uint8_t vcfEnv = 0x1c;  // 4e;
        uint8_t vcfLfo = 0x00;
        uint8_t vcfKey = 0x2b;  // 47;
        uint8_t vca = 0x5c;
        uint8_t env_a = 0x00;
        uint8_t env_d = 0x2a;
        uint8_t env_s = 0x23;  // 0x3f80
        uint8_t env_r = 0x00;
        uint8_t sub = 0x40;
        uint8_t switch1 = 0x19;
        uint8_t switch2 = 0x18;
    } patchRam;

    Chorus* chorus;

    float vcaTC;
    uint32_t bufPtr = 0;

    float* vcaBuf;
    float* subBuf;
    float* pwmBuf;
    float* noiseBuf;

   private:
    void runLFO();

    // precalculated coefficients for RC networks
    float pwmTC = 0, subTC = 0, mVcaTC = 0;
    float pwmRC = 0, subRC = 0, vcaRC = 0;

    int16_t lfo, pw;
    int16_t lfoPhase;
    uint8_t lfoState = 0;
    uint16_t lfoRate;

    uint32_t noiseRNG = 1;

    uint16_t lfoDelay = 0;
    uint8_t lfoDelayState = 0;
    uint16_t lfoDelayTimer = 0;
};

class Voice {
    friend Module;

   public:
    Voice();
    void on(uint8_t midiNote);
    void off();
    void run(Module* m, float* buffer, uint32_t framePos, uint32_t samples);

   private:
    float omega = 0, theta = 0;   // phase increment and angle FIXME better names
    float delay = 0, lastpw = 0;  // delay slots for antialiasing
    uint8_t pulseStage = 1;       // pulse wave phase
    float subosc = 1;             // sub oscillator flipflop output

    uint8_t envPhase = 0;   // current running state of envelope
    int16_t env = 0; // calculated envelope amount
    int16_t vcfCut; // calculated cutoff to filter
    int16_t vcaEnv; // calculated level to VCA (env/gate)
    float vcaRC = 0, vcfRC = 0; // RC circuit state values

    uint8_t note = 0;

    // filter
    float y0 = 0, y1 = 0, y2 = 0, y3 = 0;
};

#endif