/*
 * Copyright (C) 2025 Linux Studio Plugins Project <https://lsp-plug.in/>
 *           (C) 2025 Vladimir Sadovnikov <sadko4u@gmail.com>
 *
 * This file is part of lsp-plugins-mb-ringmod-sc
 * Created on: 08 сен 2025 г.
 *
 * lsp-plugins-mb-ringmod-sc is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * any later version.
 *
 * lsp-plugins-mb-ringmod-sc 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 Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with lsp-plugins-mb-ringmod-sc. If not, see <https://www.gnu.org/licenses/>.
 */

#ifndef PRIVATE_PLUGINS_MB_RINGMOD_SC_H_
#define PRIVATE_PLUGINS_MB_RINGMOD_SC_H_

#include <lsp-plug.in/dsp-units/ctl/Counter.h>
#include <lsp-plug.in/dsp-units/util/Analyzer.h>
#include <lsp-plug.in/dsp-units/util/Crossover.h>
#include <lsp-plug.in/dsp-units/util/Delay.h>
#include <lsp-plug.in/dsp-units/util/FFTCrossover.h>
#include <lsp-plug.in/dsp-units/util/RingBuffer.h>
#include <lsp-plug.in/dsp-units/ctl/Bypass.h>
#include <lsp-plug.in/plug-fw/core/IDBuffer.h>
#include <lsp-plug.in/plug-fw/plug.h>
#include <private/meta/mb_ringmod_sc.h>

namespace lsp
{
    namespace plugins
    {
        /**
         * Base class for the latency compensation delay
         */
        class mb_ringmod_sc: public plug::Module
        {
            protected:
                enum sc_type_t
                {
                    SC_TYPE_INTERNAL,
                    SC_TYPE_EXTERNAL,
                    SC_TYPE_SHM_LINK,
                };

                enum sc_source_t
                {
                    SC_SRC_LEFT_RIGHT,
                    SC_SRC_RIGHT_LEFT,
                    SC_SRC_LEFT,
                    SC_SRC_RIGHT,
                    SC_SRC_MID_SIDE,
                    SC_SRC_SIDE_MID,
                    SC_SRC_MIDDLE,
                    SC_SRC_SIDE,
                    SC_SRC_MIN,
                    SC_SRC_MAX
                };

                enum mode_t
                {
                    MODE_IIR,
                    MODE_SPM,
                };

                enum metering_t
                {
                    MTR_IN,
                    MTR_SC,
                    MTR_OUT,

                    MTR_TOTAL
                };

                typedef struct premix_t
                {
                    float               fInToSc;                // Input -> Sidechain mix
                    float               fInToLink;              // Input -> Link mix
                    float               fLinkToIn;              // Link -> Input mix
                    float               fLinkToSc;              // Link -> Sidechain mix
                    float               fScToIn;                // Sidechain -> Input mix
                    float               fScToLink;              // Sidechain -> Link mix

                    plug::IPort        *pInToSc;                // Input -> Sidechain mix
                    plug::IPort        *pInToLink;              // Input -> Link mix
                    plug::IPort        *pLinkToIn;              // Link -> Input mix
                    plug::IPort        *pLinkToSc;              // Link -> Sidechain mix
                    plug::IPort        *pScToIn;                // Sidechain -> Input mix
                    plug::IPort        *pScToLink;              // Sidechain -> Link mix
                } premix_t;

                typedef struct split_t
                {
                    plug::IPort        *pEnabled;               // Enable port
                    plug::IPort        *pFreq;                  // Split frequency
                } split_t;

                typedef struct band_t
                {
                    float              *vTr;                    // Band tansfer function

                    float               fFreqStart;             // Start frequency
                    float               fFreqEnd;               // End frequency
                    float               fTauRelease;            // Release time
                    float               fAmount;                // Amount
                    float               fGain;                  // Additional gain
                    uint32_t            nHold;                  // Band hold time
                    uint32_t            nLatency;               // Compensation latency of specific band
                    uint32_t            nDuck;                  // Compensation of ducking delay
                    float               fStereoLink;            // Stereo link between channels
                    bool                bActive;                // Band is active
                    bool                bOn;                    // Apply band processing
                    bool                bMute;                  // Mute band

                    plug::IPort        *pSolo;                  // Solo band
                    plug::IPort        *pMute;                  // Mute band
                    plug::IPort        *pOn;                    // Apply band processing
                    plug::IPort        *pLookahead;             // Look-ahead time
                    plug::IPort        *pHold;                  // Hold time
                    plug::IPort        *pRelease;               // Release time
                    plug::IPort        *pDuck;                  // Duck time
                    plug::IPort        *pAmount;                // Amount
                    plug::IPort        *pGain;                  // Additional gain
                    plug::IPort        *pFreqEnd;               // Frequency range end
                    plug::IPort        *pStereoLink;            // Stereo linking
                } band_t;

                typedef struct ch_band_t
                {
                    dspu::RingBuffer    sEnvDelay;              // Delay for envelope

                    float              *vEnvelope;              // Band-filtered sidechain envelope

                    uint32_t            nHold;                  // Hold time
                    float               fPeak;                  // Current peak value
                    float               fReduction;             // Reduction level

                    plug::IPort        *pReduction;             // Reduction level meters
                } ch_band_t;

                typedef struct channel_t
                {
                    dspu::Bypass        sBypass;                // Bypass
                    dspu::Delay         sInDelay;               // Delay for input signal
                    dspu::Delay         sScDelay;               // Delay for the sidechain signal
                    dspu::Delay         sDryDelay;              // Delay for dry (unprocessed) signal
                    dspu::Crossover     sCrossover;             // Crossover
                    dspu::Crossover     sScCrossover;           // Sidechain Crossover
                    dspu::FFTCrossover  sFFTCrossover;          // FFT crossover
                    dspu::FFTCrossover  sFFTScCrossover;        // Sidechain FFT crossover
                    ch_band_t           vBands[meta::mb_ringmod_sc::BANDS_MAX]; // Band processors

                    float              *vIn;                    // Plugin input buffer pointer
                    float              *vSc;                    // Plugin sidechain buffer pointer
                    float              *vLink;                  // Plugin link buffer pointer
                    float              *vOut;                   // Plugin output buffer pointer

                    float              *vInPtr;                 // Current pointer to the input data after pre-mix stage
                    float              *vScPtr;                 // Current pointer to the sidechain data after pre-mix stage
                    float              *vLinkPtr;               // Current pointer to the link data after pre-mix stage
                    float              *vOutPtr;                // Current pointer to output buffer after pre-mix stage

                    float              *vTmpIn;                 // Replacement buffer for input (premix)
                    float              *vTmpLink;               // Replacement buffer for link (premix)
                    float              *vTmpSc;                 // Replacement buffer for sidechain (premix)

                    float              *vDataIn;                // Input data buffer after crossover
                    float              *vSidechain;             // Sidechain buffer after crossover
                    float              *vDataOut;               // Data buffer after crossover and processing
                    float              *vGain;                  // Gain characteristics
                    float              *vFftIn;                 // Input FFT graph
                    float              *vFftOut;                // Output FFT graph

                    float               vMeters[MTR_TOTAL];     // Level meters
                    bool                bFft[MTR_TOTAL];        // FFT analysis flags

                    plug::IPort        *pIn;                    // Input port
                    plug::IPort        *pOut;                   // Output port
                    plug::IPort        *pSc;                    // Sidechain port
                    plug::IPort        *pShmIn;                 // Shared memory link input
                    plug::IPort        *pFft[MTR_TOTAL];        // FFT analysis input
                    plug::IPort        *pMeters[MTR_TOTAL];     // Level meters
                } channel_t;

            protected:
                size_t              nChannels;              // Number of channels
                channel_t          *vChannels;              // Delay channels
                dspu::Analyzer      sAnalyzer;              // Analyzer
                dspu::Counter       sCounter;               // Sync counter
                split_t             vSplits[meta::mb_ringmod_sc::BANDS_MAX - 1];    // Band splits
                band_t              vBands[meta::mb_ringmod_sc::BANDS_MAX];         // Bands
                float              *vBuffer;                // Temporary buffer for audio processing
                float              *vEmptyBuffer;           // Empty buffer filled with zeros
                float              *vFreqs;                 // Frequencies
                uint32_t           *vIndexes;               // Frequency indexes
                premix_t            sPremix;                // Sidechain pre-mix

                uint32_t            nType;                  // Sidechain type
                uint32_t            nSource;                // Sidechain source
                uint32_t            nMode;                  // Crossover mode
                uint32_t            nLatency;               // Lookahead-related latency
                float               fInGain;                // Input signal gain
                float               fScGain;                // Sidechain gain
                float               fDryGain;               // Dry gain
                float               fWetGain;               // Wet gain
                float               fScOutGain;             // Output gain for sidechain
                float               fZoom;                  // Zoom
                bool                bUpdFilters;            // Need to update filter state with UI
                bool                bSyncFilters;           // Need to synchronize filter state with UI
                bool                bActive;                // Apply sidechain processing
                bool                bInvert;                // Invert sidechain processing
                bool                bOutIn;                 // Output input signal
                bool                bOutSc;                 // Output sidechain signal

                core::IDBuffer     *pIDisplay;              // Inline display buffer

                plug::IPort        *pBypass;                // Bypass
                plug::IPort        *pGainIn;                // Input gain
                plug::IPort        *pGainSc;                // Sidechain gain
                plug::IPort        *pGainOut;               // Output gain
                plug::IPort        *pOutIn;                 // Output processed input signal
                plug::IPort        *pOutSc;                 // Output sidechain signal
                plug::IPort        *pActive;                // Activity
                plug::IPort        *pInvert;                // Invert
                plug::IPort        *pType;                  // Type of sidechain
                plug::IPort        *pMode;                  // Mode of sidechain
                plug::IPort        *pSlope;                 // Slope of sidechain
                plug::IPort        *pDry;                   // Dry gain
                plug::IPort        *pWet;                   // Wet gain
                plug::IPort        *pDryWet;                // Dry/Wet balance
                plug::IPort        *pZoom;                  // Zoom
                plug::IPort        *pReactivity;            // FFT Reactivity
                plug::IPort        *pShift;                 // FFT shift
                plug::IPort        *pFilterMesh;            // Filter meshes
                plug::IPort        *pMeterMesh;             // Metering meshes
                plug::IPort        *pSource;                // Sidechain source

                uint8_t            *pData;                  // Allocated data

            protected:
                static void         process_band(void *object, void *subject, size_t band, const float *data, size_t sample, size_t samples);
                static void         process_sc_band(void *object, void *subject, size_t band, const float *data, size_t sample, size_t samples);
                static size_t       select_fft_rank(size_t sample_rate);
                static size_t       decode_iir_slope(size_t slope);
                static float        decode_spm_slope(size_t slope);

            protected:
                void                do_destroy();
                void                update_premix();
                void                premix_channels(size_t samples);
                void                advance_premix(size_t samples);
                void                process_sidechain_type(size_t samples);
                void                process_sidechain_envelope(size_t samples);
                void                process_signal(size_t samples);
                void                update_meshes();
                void                output_meshes();
                void                output_meters();
                size_t              build_split_plan(band_t **plan);

            public:
                explicit mb_ringmod_sc(const meta::plugin_t *meta);
                mb_ringmod_sc (const mb_ringmod_sc &) = delete;
                mb_ringmod_sc (mb_ringmod_sc &&) = delete;
                virtual ~mb_ringmod_sc() override;

                mb_ringmod_sc & operator = (const mb_ringmod_sc &) = delete;
                mb_ringmod_sc & operator = (mb_ringmod_sc &&) = delete;

                virtual void        init(plug::IWrapper *wrapper, plug::IPort **ports) override;
                virtual void        destroy() override;

            public:
                virtual void        update_sample_rate(long sr) override;
                virtual void        update_settings() override;
                virtual void        ui_activated() override;
                virtual void        process(size_t samples) override;
                virtual bool        inline_display(plug::ICanvas *cv, size_t width, size_t height) override;
                virtual void        dump(dspu::IStateDumper *v) const override;
        };

    } /* namespace plugins */
} /* namespace lsp */


#endif /* PRIVATE_PLUGINS_MB_RINGMOD_SC_H_ */

