/*
 * ZaMultiComp multiband compressor
 * Copyright (C) 2014  Damien Zammit <damien@zamaudio.com>
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as
 * published by the Free Software Foundation; either version 2 of
 * the License, or any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU General Public License for more details.
 */

#ifndef ZAMULTICOMPX2PLUGIN_HPP_INCLUDED
#define ZAMULTICOMPX2PLUGIN_HPP_INCLUDED

#include "DistrhoPlugin.hpp"
#include <algorithm>

START_NAMESPACE_DISTRHO

#define MAX_FILT 2
#define MAX_COMP 3
#define MAX_SAMPLES 480
#define DANGER 100000.f
#define EPS 1e-20f

// -----------------------------------------------------------------------

class ZaMultiCompPlugin : public Plugin
{
public:
    enum Parameters
    {
        paramAttack1 = 0,
        paramAttack2,
        paramAttack3,
        paramRelease1,
        paramRelease2,
        paramRelease3,
        paramKnee1,
        paramKnee2,
        paramKnee3,
        paramRatio1,
        paramRatio2,
        paramRatio3,
        paramThresh1,
        paramThresh2,
        paramThresh3,

        paramMakeup1,
        paramMakeup2,
        paramMakeup3,

        paramXover1,
        paramXover2,

	paramGainR1,
	paramGainR2,
	paramGainR3,

	paramToggle1,
	paramToggle2,
	paramToggle3,

	paramListen1,
	paramListen2,
	paramListen3,

	paramGlobalGain,
	paramOutputLevel,
	paramOutputLevelLow,
	paramOutputLevelMed,
	paramOutputLevelHigh,
        paramCount
    };

    enum States
    {
        stateReadMeter,
	stateCount
    };

    ZaMultiCompPlugin();

protected:
    // -------------------------------------------------------------------
    // Information

    const char* getLabel() const noexcept override
    {
        return "ZaMultiComp";
    }

    const char* getDescription() const noexcept override
    {
        return "Mono multiband compressor, with 3 adjustable bands.";
    }

    const char* getMaker() const noexcept override
    {
        return "Damien Zammit";
    }

    const char* getHomePage() const noexcept override
    {
        return "http://www.zamaudio.com";
    }

    const char* getLicense() const noexcept override
    {
        return "GPL v2+";
    }

    uint32_t getVersion() const noexcept override
    {
        return d_version(3, 7, 0);
    }

    int64_t getUniqueId() const noexcept override
    {
        return d_cconst('Z', 'M', 'M', 'C');
    }

    // -------------------------------------------------------------------
    // Init

    void initParameter(uint32_t index, Parameter& parameter) ;
    void initProgramName(uint32_t index, String& programName) ;
    void initState(uint32_t, String&, String&) override;

    // -------------------------------------------------------------------
    // Internal data

    float getParameterValue(uint32_t index) const override;
    void setParameterValue(uint32_t index, float value) override;
    void loadProgram(uint32_t index) override;
    String getState(const char* key) const override;
    void setState(const char* key, const char* value) override;

    // -------------------------------------------------------------------
    // Process

	static inline float
	sanitize_denormal(float v) {
	        if(!std::isnormal(v))
	                return 0.f;
	        return v;
	}

	static inline float
	from_dB(float gdb) {
	        return (exp(gdb/20.f*log(10.f)));
	}

	static inline float
	to_dB(float g) {
	        return (20.f*log10(g));
	}

    void run_comp(int k, float in, float *out);
    void run_limit(float in, float *out);
    void run_lr4(int i, float in, float *outlo, float *outhi);
    void calc_lr4(float f, int i);

    void activate() override;
    void run(const float** inputs, float** outputs, uint32_t frames) override;

	struct linear_svf {
		double k;
		double g;

		double s[2];
	};

	struct linear_svf simper[2][MAX_FILT];
    void linear_svf_set_xover(struct linear_svf *self, float sample_rate, float cutoff, float resonance);
    void linear_svf_reset(struct linear_svf *self);
    float run_linear_svf_xover(struct linear_svf *self, float in, float mixlow, float mixhigh);

	void pushsample(float samples[], float sample, int k);
	float averageabs(float samples[]);
    // -------------------------------------------------------------------

private:
    float attack[MAX_COMP],release[MAX_COMP],knee[MAX_COMP],ratio[MAX_COMP],thresdb[MAX_COMP],makeup[MAX_COMP],globalgain;
    float gainr[MAX_COMP],toggle[MAX_COMP],listen[MAX_COMP],max,out,xover1,xover2;
    float old_yl[MAX_COMP], old_y1[MAX_COMP], old_yg[MAX_COMP];
    float old_ll, old_l1;
    float limit, outlevel[3];
    int pos[3];
    float outlevelold[3][MAX_SAMPLES];
    float oldxover1, oldxover2;
    bool reset;

};

// -----------------------------------------------------------------------

END_NAMESPACE_DISTRHO

#endif