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/*
 * AlsaLibMapping -- provide low level interface with AUDIO lib (extracted from alsa-json-gateway code)
 * Copyright (C) 2015,2016,2017, Fulup Ar Foll fulup@iot.bzh
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#ifndef SHAREHALLIB_H
#define SHAREHALLIB_H

#include <stdio.h>
#include <alsa/asoundlib.h>

#include "audio-interface.h"
#include <systemd/sd-event.h>


typedef enum {
   ACTION_SET,
   ACTION_GET
} ActionSetGetT;

// VolRamp Handle Store current status for a given VolRam CB set
typedef struct {
  halRampEnumT mode;
  halCtlsEnumT slave;
  int delay;     // delay between volset in us
  int stepDown;  // linear %
  int stepUp;    // linear %
  int current;   // current volume for slave ctl
  int target;    // target volume
  sd_event_source *evtsrc; // event loop timer source
} halVolRampT;

typedef struct {
    int min;
    int max;
    int step;
    int mute;
} alsaHalDBscaleT;

typedef struct {
     char* name;
     int numid;
     snd_ctl_elem_type_t type;
     int count;    
     int minval;
     int maxval;
     int value;
     int step;
     char **enums;
     alsaHalDBscaleT  *dbscale;
} alsaHalCtlMapT;

// avoid compiler warning [Jose does not like typedef :) ]
typedef struct afb_service alsaHalServiceT;

typedef struct {
   void (*callback)(halCtlsEnumT tag, alsaHalCtlMapT *control, void* handle,  json_object *valuesJ);
   void* handle;
} alsaHalCbMapT;

typedef struct {
    halCtlsEnumT tag;
    const char *label;
    alsaHalCtlMapT ctl;
    alsaHalCbMapT cb;
    char* info;
} alsaHalMapT;

typedef struct  {
    const char  *name;
    const char  *info;
    alsaHalMapT *ctls; 
    const char  *devid;
    json_object* (*volumeCB)(ActionSetGetT action, const alsaHalCtlMapT *halCtls,  json_object *valuesJ);
} alsaHalSndCardT;

// hal-interface.c
extern afb_verb_v2 halServiceApi[];
extern char *halVolRampModes[];
PUBLIC void halServiceEvent(const char *evtname, json_object *object);
PUBLIC int  halServiceInit (const char *apiPrefix, alsaHalSndCardT *alsaHalSndCard);
PUBLIC json_object *halGetCtlByTag (halRampEnumT tag);
PUBLIC int halSetCtlByTag (halRampEnumT tag, int value);


// hal-volramp.c
PUBLIC void volumeRamp (halCtlsEnumT halTag,alsaHalCtlMapT *control, void* handle, json_object *valJ);

// hal-volume.c
PUBLIC json_object *volumeNormalise(ActionSetGetT action, const alsaHalCtlMapT *halCtls,  json_object *valuesJ);


#endif /* SHAREHALLIB_H */