/*
 * Copyright (C) 2014-2017 Eitan Isaacson
 *
 * 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 3 of the License, or
 * (at your option) 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.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, see: <http://www.gnu.org/licenses/>.
 */

#include <stdio.h>
#include <stdlib.h>
#include <emscripten.h>
#include "speak_lib.h"

static int gSamplerate = 0;

class eSpeakNGWorker {
public:
  eSpeakNGWorker() : rate(espeakRATE_NORMAL), pitch(50), current_voice(NULL) {
    if (!gSamplerate) {
      gSamplerate = espeak_Initialize(
        AUDIO_OUTPUT_SYNCHRONOUS, 100, NULL, espeakINITIALIZE_DONT_EXIT);
    }
    samplerate = gSamplerate;
    voices = espeak_ListVoices(NULL);
  }

  void synth_(const char* aText, void* aCallback) {
    t_espeak_callback* cb = reinterpret_cast<t_espeak_callback*>(aCallback);
    espeak_SetSynthCallback(cb);
    espeak_SetParameter(espeakPITCH, pitch, 0);
    espeak_SetParameter(espeakRATE, rate, 0);

    if (current_voice)
      espeak_SetVoiceByProperties(current_voice);
    else
      espeak_SetVoiceByName("default");

    espeak_Synth(aText, 0, 0, POS_CHARACTER, 0, 0, NULL, NULL);

    // Reset callback so other instances will work too.
    espeak_SetSynthCallback(NULL);
  }

  long set_voice(
        const char* aName,
        const char* aLang=NULL,
        unsigned char aGender=0,
        unsigned char aAge=0,
        unsigned char aVariant = 0
    ) {
    long result = 0;
    if (aLang || aGender || aAge || aVariant) {
      espeak_VOICE props = { 0 };
      props.name = aName;
      props.languages = aLang;
      props.gender = aGender;
      props.age = aAge;
      props.variant = aVariant;
      result = espeak_SetVoiceByProperties(&props);
    } else {
      result = espeak_SetVoiceByName(aName);
    }

    // This way we don't need to allocate the name/lang strings to the heap.
    // Instead, we store the actual global voice.
    current_voice = espeak_GetCurrentVoice();

    return result;
  }

  int getSizeOfEventStruct_() {
    return sizeof(espeak_EVENT);
  }

  const espeak_VOICE** voices;
  int samplerate;
  int rate;
  int pitch;

private:
  espeak_VOICE* current_voice;
};

#include <glue.cpp>