#include <stdlib.h>
#include <string.h>
#ifndef WIN32
#include "config.h"
#endif

#ifdef ENABLE_NLS
#include <libintl.h>
#endif

#define         _ISOC9X_SOURCE  1
#define         _ISOC99_SOURCE  1
#define         __USE_ISOC99    1
#define         __USE_ISOC9X    1

#include <math.h>

#include "ladspa.h"

#ifdef WIN32
#define _WINDOWS_DLL_EXPORT_ __declspec(dllexport)
int bIsFirstTime = 1;
void __attribute__((constructor)) swh_init(); // forward declaration
#else
#define _WINDOWS_DLL_EXPORT_
#endif

#line 9 "lowpass_iir_1891.xml"

#include "config.h"
#include "util/iir.h"
#include "ladspa-util.h"

#define LOWPASS_IIR_CUTOFF             0
#define LOWPASS_IIR_STAGES             1
#define LOWPASS_IIR_INPUT              2
#define LOWPASS_IIR_OUTPUT             3

static LADSPA_Descriptor *lowpass_iirDescriptor = NULL;

typedef struct {
    LADSPA_Data *cutoff;
    LADSPA_Data *stages;
    LADSPA_Data *input;
    LADSPA_Data *output;
    iir_stage_t* gt;
    iirf_t*      iirf;
    long         sample_rate;
    LADSPA_Data run_adding_gain;
} Lowpass_iir;

_WINDOWS_DLL_EXPORT_
const LADSPA_Descriptor *ladspa_descriptor(unsigned long index) {

#ifdef WIN32
    if (bIsFirstTime) {
        swh_init();
        bIsFirstTime = 0;
    }
#endif
    switch (index) {
    case 0:
        return lowpass_iirDescriptor;
    default:
        return NULL;
    }
}

static void activateLowpass_iir(LADSPA_Handle instance) {
    Lowpass_iir *plugin_data = (Lowpass_iir *)instance;
    iir_stage_t*gt = plugin_data->gt;
    iirf_t*iirf = plugin_data->iirf;
    long sample_rate = plugin_data->sample_rate;
#line 36 "lowpass_iir_1891.xml"

    gt = init_iir_stage(IIR_STAGE_LOWPASS,10,3,2);
    iirf = init_iirf_t(gt);
    chebyshev(iirf, gt, 2*CLAMP(f_round(*(plugin_data->stages)),1,10), IIR_STAGE_LOWPASS,
              *(plugin_data->cutoff)/(float)sample_rate, 0.5f);
    plugin_data->gt = gt;
    plugin_data->iirf = iirf;
    plugin_data->sample_rate = sample_rate;

}

static void cleanupLowpass_iir(LADSPA_Handle instance) {
#line 43 "lowpass_iir_1891.xml"
    Lowpass_iir *plugin_data = (Lowpass_iir *)instance;
    free_iirf_t(plugin_data->iirf, plugin_data->gt);
    free_iir_stage(plugin_data->gt);
    free(instance);
}

static void connectPortLowpass_iir(
 LADSPA_Handle instance,
 unsigned long port,
 LADSPA_Data *data) {
    Lowpass_iir *plugin;

    plugin = (Lowpass_iir *)instance;
    switch (port) {
    case LOWPASS_IIR_CUTOFF:
        plugin->cutoff = data;
        break;
    case LOWPASS_IIR_STAGES:
        plugin->stages = data;
        break;
    case LOWPASS_IIR_INPUT:
        plugin->input = data;
        break;
    case LOWPASS_IIR_OUTPUT:
        plugin->output = data;
        break;
    }
}

static LADSPA_Handle instantiateLowpass_iir(
 const LADSPA_Descriptor *descriptor,
 unsigned long s_rate) {
    Lowpass_iir *plugin_data = (Lowpass_iir *)calloc(1, sizeof(Lowpass_iir));
    iir_stage_t*gt = NULL;
    iirf_t*iirf = NULL;
    long sample_rate;

#line 25 "lowpass_iir_1891.xml"
    sample_rate = s_rate;

    plugin_data->gt = gt;
    plugin_data->iirf = iirf;
    plugin_data->sample_rate = sample_rate;

    return (LADSPA_Handle)plugin_data;
}

#undef buffer_write
#undef RUN_ADDING
#undef RUN_REPLACING

#define buffer_write(b, v) (b = v)
#define RUN_ADDING    0
#define RUN_REPLACING 1

static void runLowpass_iir(LADSPA_Handle instance, unsigned long sample_count) {
    Lowpass_iir *plugin_data = (Lowpass_iir *)instance;
    LADSPA_Data run_adding_gain = plugin_data->run_adding_gain;

    /* Cutoff Frequency (float value) */
    const LADSPA_Data cutoff = *(plugin_data->cutoff);

    /* Stages(2 poles per stage) (float value) */
    const LADSPA_Data stages = *(plugin_data->stages);

    /* Input (array of floats of length sample_count) */
    const LADSPA_Data * const input = plugin_data->input;

    /* Output (array of floats of length sample_count) */
    LADSPA_Data * const output = plugin_data->output;
    iir_stage_t* gt = plugin_data->gt;
    iirf_t* iirf = plugin_data->iirf;
    long sample_rate = plugin_data->sample_rate;

#line 28 "lowpass_iir_1891.xml"
    chebyshev(iirf, gt, 2*CLAMP((int)stages,1,10), IIR_STAGE_LOWPASS, cutoff/(float)sample_rate, 0.5f);
    iir_process_buffer_ns_5(iirf, gt, input, output, sample_count,RUN_ADDING);

    // Unused variable
    (void)(run_adding_gain);
}
#undef buffer_write
#undef RUN_ADDING
#undef RUN_REPLACING

#define buffer_write(b, v) (b += (v) * run_adding_gain)
#define RUN_ADDING    1
#define RUN_REPLACING 0

static void setRunAddingGainLowpass_iir(LADSPA_Handle instance, LADSPA_Data gain) {
    ((Lowpass_iir *)instance)->run_adding_gain = gain;
}

static void runAddingLowpass_iir(LADSPA_Handle instance, unsigned long sample_count) {
    Lowpass_iir *plugin_data = (Lowpass_iir *)instance;
    LADSPA_Data run_adding_gain = plugin_data->run_adding_gain;

    /* Cutoff Frequency (float value) */
    const LADSPA_Data cutoff = *(plugin_data->cutoff);

    /* Stages(2 poles per stage) (float value) */
    const LADSPA_Data stages = *(plugin_data->stages);

    /* Input (array of floats of length sample_count) */
    const LADSPA_Data * const input = plugin_data->input;

    /* Output (array of floats of length sample_count) */
    LADSPA_Data * const output = plugin_data->output;
    iir_stage_t* gt = plugin_data->gt;
    iirf_t* iirf = plugin_data->iirf;
    long sample_rate = plugin_data->sample_rate;

#line 28 "lowpass_iir_1891.xml"
    chebyshev(iirf, gt, 2*CLAMP((int)stages,1,10), IIR_STAGE_LOWPASS, cutoff/(float)sample_rate, 0.5f);
    iir_process_buffer_ns_5(iirf, gt, input, output, sample_count,RUN_ADDING);

    // Unused variable
    (void)(run_adding_gain);
}

void __attribute__((constructor)) swh_init() {
    char **port_names;
    LADSPA_PortDescriptor *port_descriptors;
    LADSPA_PortRangeHint *port_range_hints;

#ifdef ENABLE_NLS
#define D_(s) dgettext(PACKAGE, s)
    bindtextdomain(PACKAGE, PACKAGE_LOCALE_DIR);
#else
#define D_(s) (s)
#endif


    lowpass_iirDescriptor =
     (LADSPA_Descriptor *)malloc(sizeof(LADSPA_Descriptor));

    if (lowpass_iirDescriptor) {
        lowpass_iirDescriptor->UniqueID = 1891;
        lowpass_iirDescriptor->Label = "lowpass_iir";
        lowpass_iirDescriptor->Properties =
         LADSPA_PROPERTY_HARD_RT_CAPABLE;
        lowpass_iirDescriptor->Name =
         D_("Glame Lowpass Filter");
        lowpass_iirDescriptor->Maker =
         "Alexander Ehlert <[email protected]>";
        lowpass_iirDescriptor->Copyright =
         "GPL";
        lowpass_iirDescriptor->PortCount = 4;

        port_descriptors = (LADSPA_PortDescriptor *)calloc(4,
         sizeof(LADSPA_PortDescriptor));
        lowpass_iirDescriptor->PortDescriptors =
         (const LADSPA_PortDescriptor *)port_descriptors;

        port_range_hints = (LADSPA_PortRangeHint *)calloc(4,
         sizeof(LADSPA_PortRangeHint));
        lowpass_iirDescriptor->PortRangeHints =
         (const LADSPA_PortRangeHint *)port_range_hints;

        port_names = (char **)calloc(4, sizeof(char*));
        lowpass_iirDescriptor->PortNames =
         (const char **)port_names;

        /* Parameters for Cutoff Frequency */
        port_descriptors[LOWPASS_IIR_CUTOFF] =
         LADSPA_PORT_INPUT | LADSPA_PORT_CONTROL;
        port_names[LOWPASS_IIR_CUTOFF] =
         D_("Cutoff Frequency");
        port_range_hints[LOWPASS_IIR_CUTOFF].HintDescriptor =
         LADSPA_HINT_BOUNDED_BELOW | LADSPA_HINT_BOUNDED_ABOVE | LADSPA_HINT_DEFAULT_HIGH | LADSPA_HINT_SAMPLE_RATE | LADSPA_HINT_LOGARITHMIC;
        port_range_hints[LOWPASS_IIR_CUTOFF].LowerBound = 0.0001;
        port_range_hints[LOWPASS_IIR_CUTOFF].UpperBound = 0.45;

        /* Parameters for Stages(2 poles per stage) */
        port_descriptors[LOWPASS_IIR_STAGES] =
         LADSPA_PORT_INPUT | LADSPA_PORT_CONTROL;
        port_names[LOWPASS_IIR_STAGES] =
         D_("Stages(2 poles per stage)");
        port_range_hints[LOWPASS_IIR_STAGES].HintDescriptor =
         LADSPA_HINT_BOUNDED_BELOW | LADSPA_HINT_BOUNDED_ABOVE | LADSPA_HINT_DEFAULT_1 | LADSPA_HINT_INTEGER;
        port_range_hints[LOWPASS_IIR_STAGES].LowerBound = 1.0;
        port_range_hints[LOWPASS_IIR_STAGES].UpperBound = 10.0;

        /* Parameters for Input */
        port_descriptors[LOWPASS_IIR_INPUT] =
         LADSPA_PORT_INPUT | LADSPA_PORT_AUDIO;
        port_names[LOWPASS_IIR_INPUT] =
         D_("Input");
        port_range_hints[LOWPASS_IIR_INPUT].HintDescriptor = 0;

        /* Parameters for Output */
        port_descriptors[LOWPASS_IIR_OUTPUT] =
         LADSPA_PORT_OUTPUT | LADSPA_PORT_AUDIO;
        port_names[LOWPASS_IIR_OUTPUT] =
         D_("Output");
        port_range_hints[LOWPASS_IIR_OUTPUT].HintDescriptor = 0;

        lowpass_iirDescriptor->activate = activateLowpass_iir;
        lowpass_iirDescriptor->cleanup = cleanupLowpass_iir;
        lowpass_iirDescriptor->connect_port = connectPortLowpass_iir;
        lowpass_iirDescriptor->deactivate = NULL;
        lowpass_iirDescriptor->instantiate = instantiateLowpass_iir;
        lowpass_iirDescriptor->run = runLowpass_iir;
        lowpass_iirDescriptor->run_adding = runAddingLowpass_iir;
        lowpass_iirDescriptor->set_run_adding_gain = setRunAddingGainLowpass_iir;
    }
}

void __attribute__((destructor)) swh_fini() {
    if (lowpass_iirDescriptor) {
        free((LADSPA_PortDescriptor *)lowpass_iirDescriptor->PortDescriptors);
        free((char **)lowpass_iirDescriptor->PortNames);
        free((LADSPA_PortRangeHint *)lowpass_iirDescriptor->PortRangeHints);
        free(lowpass_iirDescriptor);
    }
    lowpass_iirDescriptor = NULL;

}