/*
 * Copyright (C) 2018 "IoT.bzh"
 * Author 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.
 *
 */

#define _GNU_SOURCE  // needed for vasprintf

#ifndef _ALSA_SOFTMIXER_
#define _ALSA_SOFTMIXER_

#include <json-c/json_object.h>
#include <stdlib.h>
#include <stdio.h>
#include <assert.h>
#include <alsa/asoundlib.h>
#include <stdbool.h>
#include <systemd/sd-event.h>
#include <semaphore.h>

#include <urcu/list.h>

#include "ctl-plugin.h"
#include "wrap-json.h"

#include "alsa-ringbuf.h"

#include "alsa-transaction.h"

#ifndef PUBLIC
#define PUBLIC
#endif
#ifndef STATIC
#define STATIC static
#endif

#define MAINLOOP_CONCURENCY 0
#define MAINLOOP_WATCHDOG 30000
#define ALSA_DEFAULT_PCM_RATE 48000
#define ALSA_DEFAULT_PCM_VOLUME 80

#define ALSA_CARDID_MAX_LEN 64


#define SMIXER_SUBDS_CTLS 16
#define SMIXER_DEFLT_LOOPS 4
#define SMIXER_DEFLT_SINKS 8
#define SMIXER_DEFLT_SOURCES 32
#define SMIXER_DEFLT_ZONES 32
#define SMIXER_DEFLT_STREAMS 32
#define SMIXER_DEFLT_RAMPS 8

#define SMIXER_DEFLT_DELAYMS	1000

#define SOFTMIXER_VERB_NONE "none"

#define ALSA_PLUG_PROTO(plugin) \
    int _snd_pcm_ ## plugin ## _open(snd_pcm_t **pcmp, const char *name, snd_config_t *root, snd_config_t *conf, snd_pcm_stream_t stream, int mode)

#define SOFTMIXER_NOMEM(api) \
	AFB_ApiError((api), "%s: Insufficient memory", __func__)

// auto switch from Log to API request depending on request presence.
#define AFB_IfReqFailF(mixer, request, status, format, ...) \
 if (request) AFB_ReqFailF(request, status, format, __VA_ARGS__); \
 else AFB_ApiError(mixer->api, format, __VA_ARGS__); 

#ifndef PUBLIC
#define PUBLIC
#endif
#ifndef STATIC
#define STATIC static
#endif

typedef enum {
    FONTEND_NUMID_IGNORE,
    FONTEND_NUMID_PAUSE,
    FONTEND_NUMID_RUN
} RegistryNumidT;

typedef struct {
    int cardidx;
    const char *devpath;
    const char *cardid;
    const char *name;
    const char *longname;
    const char *pcmplug_params;
    int device;
    int subdev;
} AlsaDevInfoT;

#define SND_FORMAT_STRING_LEN 16
#define SND_FORMAT_DEFAULT "S16_LE"

typedef struct {
    unsigned int rate;
    unsigned int channels;
    char formatString[SND_FORMAT_STRING_LEN];
    snd_pcm_format_t format;
    snd_pcm_access_t access;
    size_t sampleSize;
} AlsaPcmHwInfoT;

typedef struct {
	const char * name;
    int ccount;
    bool mute;
	int eventFd;
    AlsaDevInfoT cid;
    snd_pcm_t *handle;
    AlsaPcmHwInfoT *params;

	struct SoftMixerT_ * mixer;

    snd_pcm_uframes_t avail_min;

	bool closeAtDeletion; // intermediate pcms in the pcm chain must not be closed, else it make libasound abort()
	bool isPcmPlug;
} AlsaPcmCtlT;

typedef struct {
	AlsaPcmCtlT *pcmIn;
	AlsaPcmCtlT *pcmOut;
    AFB_ApiT api;
    sd_event_source* evtsrc;

    size_t frame_size;
    snd_pcm_uframes_t latency;	/* final latency in frames */

    // IO Job
	alsa_ringbuf_t * rbuf;

	uint32_t		  write_err_count;
	uint32_t		  read_err_count;

    unsigned int channels;
    sd_event *sdLoop;

    pthread_t rthread;
    pthread_t wthread;

    int tid;
    char* info;

    int nbPcmFds;
	struct pollfd * pollFds;

    sem_t sem;
    pthread_mutex_t mutex;

    int saveFd;
	bool ending;

	struct AlsaStreamAudioT_ *  stream;

} AlsaPcmCopyHandleT;

typedef struct {
    const char*name;
    int numid;
    int count;
    long min;
    long max;
    long step;
} AlsaSndControlT;


typedef struct {
    const char*uid;
    int port;
	double volume;
	struct cds_list_head	list;
} AlsaPcmChannelT;


typedef struct {
    const char *uid;
    int delay; // delay between volset in us
    int stepDown; // linear %
    int stepUp; // linear %
	struct cds_list_head list;
} AlsaVolRampT;


typedef struct {
    int numid;
    RegistryNumidT type;
    AlsaPcmCtlT *pcm;
	struct cds_list_head cardListEntry;	/* node to list in AlsaSndCtlT */
	struct AlsaSndCtlT_ *sndcard; /* ref to owner */
} RegistryEntryPcmT;


typedef struct AlsaSndCtlT_ {
    AlsaDevInfoT cid;
    snd_ctl_t *ctl;
    AlsaPcmHwInfoT *params;
	long nbRegistry;
	struct cds_list_head registryList;
	struct SubscribeHandleT_ * eventSubscribeHandle;
} AlsaSndCtlT;


typedef struct {
    const char *uid;
	unsigned int nbSources;
	AlsaPcmChannelT sources;
	unsigned int nbSinks;
	AlsaPcmChannelT sinks;
    int ccount;
    AlsaPcmHwInfoT *params;
	struct cds_list_head	list;
	snd_config_t * routeConfig;
	bool isPcmPlug;
} AlsaSndZoneT;

typedef struct {
    const char *uid;
    const char *verb;
    AlsaSndCtlT *sndcard;
    AlsaSndControlT volume;
    AlsaSndControlT mute;
	unsigned int nbChannels;
	AlsaPcmChannelT channels;
    snd_pcm_stream_t direction;
	struct cds_list_head	list;
	bool isPcmPlug;
	void * apiVerbHandle;
} AlsaSndPcmT;

typedef struct {
    char * uid;
    int index; // AVIRT: parent PCM index (Since subdev idx is always 0)
    int numid;
	struct cds_list_head list;
} AlsaLoopSubdevT;


struct SoftMixerT_;

typedef struct AlsaSndLoopT {
    bool avirt; // AVIRT: Is this loop AVIRT?
    const char *uid;
	struct SoftMixerT_ * mixer; /* owner */
    int playback; // AVIRT: UNUSED
    int capture; // AVIRT: UNUSED
    AlsaSndCtlT *sndcard;
	int nbSubdevs;
	AlsaLoopSubdevT subdevs;
	struct cds_list_head list;
} AlsaSndLoopT;

typedef struct AlsaStreamAudioT_ {
    const char *uid;
    const char *verb;
    const char *info;
    const char *sink;
	const char *playback;
    const char *source;
    const char *ramp;
    int volume;
    int mute;
	unsigned int	delayms;
    AlsaPcmHwInfoT *params;
    AlsaPcmCopyHandleT *copy;
	struct cds_list_head	list;	/* link to the global list*/
	AlsaPcmCtlT * softvol;
	snd_config_t * softvolConfig;
	snd_config_t * rateConfig;
	void * verbApiHandle;
} AlsaStreamAudioT;

typedef struct SoftMixerT_{
    const char *uid;
    const char *info;
    AFB_ApiT api;
    sd_event *sdLoop;

    struct {
        unsigned int loops;
        unsigned int sinks;
        unsigned int sources;
        unsigned int zones;
        unsigned int streams;
        unsigned int ramps;
    } max;
	unsigned int nbLoops;
	AlsaSndLoopT loops;
	unsigned int nbSinks;
	AlsaSndPcmT	sinks;
	unsigned int nbSources;
	AlsaSndPcmT	sources;
	unsigned int nbZones;
	AlsaSndZoneT zones;
	unsigned int nbStreams;
	AlsaStreamAudioT streams;
	unsigned int nbRamps;
	AlsaVolRampT ramps;

	AlsaMixerTransaction * transaction; // current transaction

	struct cds_list_head list; // node to list of all mixers

	struct cds_list_head transactionList; // all transactions of this mixer
} SoftMixerT;

// alsa-utils-bypath.c
PUBLIC snd_ctl_card_info_t *AlsaByPathInfo(SoftMixerT *mixer, const char *devpath);
PUBLIC AlsaPcmCtlT * AlsaPcmCtlNew(SoftMixerT*, const char*);
PUBLIC void AlsaPcmCtlDelete(SoftMixerT *mixer, void *);
PUBLIC AlsaPcmCtlT *AlsaByPathOpenPcmCtl(SoftMixerT *mixer, AlsaDevInfoT *pcmId, snd_pcm_stream_t direction);
PUBLIC snd_ctl_t *AlsaByPathOpenCtl(SoftMixerT *mixer, const char *uid, AlsaSndCtlT *dev);

// alsa-utils-dump.c
#define ALSA_PCM_UID(pcmHandle, buffer) AlsaDumpPcmUid(pcmHandle, buffer, sizeof(buffer))
#define ALSA_CTL_UID(ctlHandle, buffer) AlsaDumpCtlUid(ctlHandle, buffer, sizeof(buffer))
PUBLIC json_object *AlsaDumpObjF(const char *format, ...);
PUBLIC char *AlsaDumpPcmUid(snd_pcm_t *pcmHandle, char *buffer, size_t len);
PUBLIC char *AlsaDumpCtlUid(snd_ctl_t *ctlHandle, char *buffer, size_t len);
PUBLIC void AlsaDumpFormats(SoftMixerT *mixer, snd_pcm_t *pcmHandle);
PUBLIC void AlsaDumpCtlSubdev(SoftMixerT *mixer, snd_ctl_t *handle);
PUBLIC void AlsaDumpPcmParams(SoftMixerT *mixer, snd_pcm_hw_params_t *pcmHwParams);
PUBLIC void AlsaDumpPcmInfo(SoftMixerT *mixer, const char* info, snd_pcm_t *pcm);
PUBLIC void AlsaDumpElemConfig(SoftMixerT *mixer, const char* info, const char* elem);
PUBLIC void AlsaDumpCtlConfig(SoftMixerT *mixer, const char* info, snd_config_t *config, int indent);

// alsa-core-ctl.c
PUBLIC snd_ctl_elem_id_t *AlsaCtlGetNumidElemId(SoftMixerT *mixer, AlsaSndCtlT *sndcard, int numid) ;
PUBLIC snd_ctl_elem_id_t *AlsaCtlGetNameElemId(SoftMixerT *mixer, AlsaSndCtlT *sndcard, const char *ctlName) ;

PUBLIC int CtlElemIdGetLong(SoftMixerT *mixer, AlsaSndCtlT *sndcard, snd_ctl_elem_id_t *elemId, long *value) ;
PUBLIC int CtlElemIdSetLong(SoftMixerT *mixer, AlsaSndCtlT *sndcard, snd_ctl_elem_id_t *elemId, long value) ;
PUBLIC snd_ctl_card_info_t *AlsaCtlGetCardInfo(SoftMixerT *mixer, const char *cardid) ;
PUBLIC int AlsaCtlNumidSetLong(SoftMixerT *mixer, AlsaSndCtlT *sndcard, int numid, long value) ;
PUBLIC int AlsaCtlNumidGetLong(SoftMixerT *mixer, AlsaSndCtlT *sndcard, int numid, long* value) ;
PUBLIC int AlsaCtlNameSetLong(SoftMixerT *mixer, AlsaSndCtlT *sndcard, const char *ctlName, long value) ;
PUBLIC int AlsaCtlNameGetLong(SoftMixerT *mixer, AlsaSndCtlT *sndcard, const char *ctlName, long* value) ;
PUBLIC int AlsaCtlCreateControl(SoftMixerT *mixer, AlsaSndCtlT *sndcard, char* ctlName, int ctlCount, int ctlMin, int ctlMax, int ctlStep, long value) ;

PUBLIC int AlsaCtlSubscribe(SoftMixerT *mixer, const char *uid, AlsaSndCtlT *sndcard) ;

PUBLIC void AlsaCtlUnregister(SoftMixerT* mixer, void *);
PUBLIC int AlsaCtlRegister(SoftMixerT *mixer, AlsaSndCtlT *sndcard, AlsaPcmCtlT *pcmdev,  RegistryNumidT type, int numid);

// alsa-core-pcm.c
PUBLIC int AlsaPcmConf(SoftMixerT *mixer, AlsaPcmCtlT *pcm, int mode);
PUBLIC int AlsaPcmCopyStart(SoftMixerT *mixer, AlsaStreamAudioT *stream, AlsaPcmCtlT *pcmIn, AlsaPcmCtlT *pcmOut, AlsaPcmHwInfoT * opts);
PUBLIC int AlsaPcmCopyStop(SoftMixerT *mixer, AlsaPcmCopyHandleT * handle);

// alsa-plug-*.c _snd_pcm_PLUGIN_open_ see macro ALSA_PLUG_PROTO(plugin)
PUBLIC int AlsaPcmCopyMuteSignal(SoftMixerT *mixer, AlsaPcmCtlT *pcmIn, bool mute);

PUBLIC AlsaPcmCtlT* AlsaCreateSoftvol(SoftMixerT *mixer, AlsaStreamAudioT *stream, char *slaveid, AlsaSndCtlT *sndcard, char* ctlName, int max, int open);
PUBLIC AlsaPcmCtlT* AlsaCreateRoute(SoftMixerT *mixer, AlsaSndZoneT *zone, int open);
PUBLIC AlsaPcmCtlT* AlsaCreateRate(SoftMixerT *mixer, AlsaStreamAudioT *stream, const char* pcmName, AlsaPcmCtlT *pcmSlave, AlsaPcmHwInfoT *params, int open);
PUBLIC AlsaPcmCtlT* AlsaCreateDmix(SoftMixerT *mixer, const char* pcmName, AlsaSndPcmT *pcmSlave, int open);

// alsa-api-*

PUBLIC int ApiLoopAttach(SoftMixerT *mixer, AFB_ReqT request, const char *, json_object * argsJ, json_object *streamsJ);
PUBLIC int ApiSourceAttach(SoftMixerT *mixer, AFB_ReqT request, const char *, json_object * argsJ);
PUBLIC int ApiSinkAttach(SoftMixerT *mixer, AFB_ReqT request, const char *, json_object * argsJ);
PUBLIC int ApiStreamAttach(SoftMixerT *mixer, AFB_ReqT request, const char * uid, const char *prefix, json_object * argsJ);
PUBLIC int ApiZoneAttach(SoftMixerT *mixer, AFB_ReqT request, const char *, json_object * argsJ);
PUBLIC int ApiRampAttach(SoftMixerT *mixer, AFB_ReqT request, const char *, json_object *argsJ);

PUBLIC void loopsDisplay(SoftMixerT * mixer);

// helper used for attach verb,and also by the streams API for fake zones
PUBLIC AlsaSndZoneT * zoneCreate(SoftMixerT* mixer, const char * uid, json_object * argsJ);

PUBLIC AlsaLoopSubdevT *ApiLoopFindSubdev(SoftMixerT *mixer, const char *streamUid, const char *targetUid, AlsaSndLoopT **loop);

PUBLIC AlsaPcmHwInfoT *ApiPcmSetParams(SoftMixerT *mixer, const char *uid, json_object *paramsJ);
PUBLIC AlsaPcmHwInfoT* ApiPcmParamsDup(SoftMixerT* mixer, AlsaPcmHwInfoT* params);
PUBLIC void ApiPcmParamsShow(SoftMixerT * mixer, const char * msg, const AlsaPcmHwInfoT * params);
PUBLIC void ApiPcmDelParams(SoftMixerT*, AlsaPcmHwInfoT*);

PUBLIC AlsaSndPcmT *ApiPcmAttachOne(SoftMixerT *mixer, const char *uid, snd_pcm_stream_t direction, json_object *argsJ);
PUBLIC AlsaSndPcmT * ApiPcmNew(SoftMixerT* mixer);
PUBLIC void ApiPcmDelete(SoftMixerT * mixer, AlsaSndPcmT * pcm);

PUBLIC AlsaVolRampT *ApiRampGetByUid(SoftMixerT *mixer, const char *uid);

PUBLIC AlsaPcmHwInfoT *ApiSinkGetParamsByZone(SoftMixerT *mixer, const char *target);

PUBLIC AlsaSndPcmT  *ApiSinkGetByUid(SoftMixerT *mixer, const char *target);
PUBLIC AlsaSndCtlT *ApiSourceFindSubdev(SoftMixerT *mixer, const char *target);


PUBLIC AlsaSndZoneT *ApiZoneGetByUid(SoftMixerT *mixer, const char *target);

// alsa-effect-ramp.c
PUBLIC AlsaVolRampT *ApiRampGetByUid(SoftMixerT *mixer, const char *uid);
PUBLIC int AlsaVolRampApply(SoftMixerT *mixer, AlsaSndCtlT *sndcard, AlsaStreamAudioT *stream, json_object *rampJ);

#endif