/*********************************************************************************
 *      Copyright:  (C) 2019 LingYun IoT System Studio
 *                  All rights reserved.
 *
 *       Filename:  main.c
 *    Description:  This file 
 *                 
 *        Version:  1.0.0(29/01/19)
 *         Author:  Guo Wenxue <guowenxue@gmail.com>
 *      ChangeLog:  1, Release initial version on "29/01/19 15:34:41"
 *                 
 ********************************************************************************/
#include <stdio.h>
#include <time.h>
#include <unistd.h>
#include <getopt.h>
#include <libgen.h>
#include <string.h>
#include <math.h>

#include <cjson/cJSON.h>
#include <mosquitto.h>

#include "lylib/util_time.h"
#include "lylib/logger.h"
#include "lylib/util_proc.h"
#include "hal/hal.h"
#include "conf/conf.h"

#define PROG_VERSION               "v1.0.0"
#define DAEMON_PIDFILE             "/tmp/.iotd.pid"


int check_set_program_running(int daemon);
void *mqtt_sub_worker(void *args);

static void program_usage(char *progname)
{
    
    printf("Usage: %s [OPTION]...\n", progname);
    printf(" %s is LingYun studio MQTT daemon program running on RaspberryPi\n", progname);

    printf("\nMandatory arguments to long options are mandatory for short options too:\n");
    printf(" -d[debug   ]  Running in debug mode\n");
    printf(" -c[conf    ]  Specify configure file\n");
    printf(" -h[help    ]  Display this help information\n");
    printf(" -v[version ]  Display the program version\n");

    printf("\n%s version %s\n", progname, PROG_VERSION);
    return;
}

void auto_light_off(int signum)
{
    log_nrml("turn hallway auto light off now\n");
    //turn_light(LIGHT_HALLWAY, OFF);
}

int main (int argc, char **argv)
{
    float              temp;
    float              rh;
    int                daemon = 1;
    pthread_t          tid;
    iotd_ctx_t         ctx;
    hal_ctx_t         *hal_ctx = &ctx.hal_ctx;
    char               *conf_file="/etc/iotd.conf";
    int                debug = 0;
    int                opt;
    char              *progname=NULL;
    float              lux = 0.0;

    struct option long_options[] = {
        {"conf", required_argument, NULL, 'c'},
        {"debug", no_argument, NULL, 'd'},
        {"version", no_argument, NULL, 'v'},
        {"help", no_argument, NULL, 'h'},
        {NULL, 0, NULL, 0}
    };

    progname = (char *)basename(argv[0]);

    /* Parser the command line parameters */
    while ((opt = getopt_long(argc, argv, "c:dvh", long_options, NULL)) != -1)
    {
        switch (opt)
        {
            case 'c': /* Set configure file */
                conf_file = optarg;
                break;

            case 'd': /* Set debug running */
                daemon = 0;
                debug = 1;
                break;

            case 'v':  /* Get software version */
                printf("%s version %s\n", progname, PROG_VERSION);
                return 0;

            case 'h':  /* Get help information */
                program_usage(progname);
                return 0;
        
            default:
                break;
        }
    
    }


    if( !conf_file )
        debug = 1;

    //printf("conf_file: %s debug:%d\n", conf_file, debug);

    if( parser_conf(conf_file, &ctx, debug)<0 )
    {
        fprintf(stderr, "Parser mqtted configure file failure\n");
        return -2;
    }

    return 0;

    if( hal_init(hal_ctx) < 0 )
    {
        log_err("Initialise hardware failure\n");
        return -3;
    }
    else 
    {
        log_nrml("HAL initialise ok\n");
    }

    install_default_signal();
    signal(SIGALRM, auto_light_off);

    if( check_set_program_running(daemon) < 0 ) 
        goto OUT;

    mosquitto_lib_init();

    if( thread_start(&tid, mqtt_sub_worker, &ctx ) < 0 )
    {
        log_fatal("Start MQTT subsciber worker thread failure\n");
        goto OUT;
    }
    log_nrml("Start MQTT subsciber worker thread ok\n");

    log_nrml("Start infrared monitor thread working...\n");
    while( ! g_signal.stop )
    { 
        lux = tsl2561_get_lux(); 
        if( lux > hal_ctx->lux_threshold )
        {
            log_nrml("Lux[%.3f] > Treshold[%.3f], don't need auto light.\n", lux, hal_ctx->lux_threshold);
            sleep(30);
            continue;
        }

        log_nrml("start infrared monitor detect...\n");
        if( infrared_detect() ) 
        {
            log_nrml("Someone incoming detected by infrared\n");
            if( lux < hal_ctx->lux_threshold )
            {
                log_nrml("Lux[%.3f] < Treshold[%.3f], auto light on now..\n", lux, hal_ctx->lux_threshold);
                //turn_light(LIGHT_HALLWAY, ON);
                alarm(hal_ctx->gpio.light_intval);
            }
        }
    }


OUT:
    mosquitto_lib_cleanup();
    hal_term(hal_ctx);
    logger_term();
    
    return 0;
} /* ----- End of main() ----- */

int check_set_program_running(int daemon)
{
    if( check_daemon_running(DAEMON_PIDFILE) ) 
    {
        log_err("Program already running, process exit now");
        return -1;
    }

    if( daemon ) 
    {
        if( set_daemon_running(DAEMON_PIDFILE) < 0 )
        {
            log_err("set program running as daemon failure\n");
            return -2;
        }
    }
    else
    {
        if( record_daemon_pid(DAEMON_PIDFILE) < 0 )
        {
            log_err("record program running PID failure\n");
            return -3;
        }
    }

    return 0;
}


void sub_connect_callback(struct mosquitto *mosq, void *userdata, int result)
{
    iotd_ctx_t             *ctx = (iotd_ctx_t *)userdata;

    if( result )
    {
        log_err("Subscriber connect to broker server failed, rv=%d\n", result);
        return ;
    }
    
    log_nrml("Subscriber connect to broker server[%s:%d] successfully\n", ctx->mqtt_ctx.host, ctx->mqtt_ctx.port); 
    mosquitto_subscribe(mosq, NULL, ctx->mqtt_ctx.subTopic, ctx->mqtt_ctx.subQos);
}

void sub_disconnect_callback(struct mosquitto *mosq, void *userdata, int result)
{
    iotd_ctx_t             *ctx = (iotd_ctx_t *)userdata;

    log_warn("Subscriber disconnect to broker server[%s:%d], reason=%d\n", 
		    ctx->mqtt_ctx.host, ctx->mqtt_ctx.port, result); 
}

void proc_json_items(cJSON *root)
{
    int                    i;
    char                  *value;
    cJSON                 *item; 
    cJSON                 *array;

    if( !root )
    {
        log_err("Invalid input arguments $root\n");
        return ;
    }

    for( i=0; i<cJSON_GetArraySize(root); i++ )
    {
        item = cJSON_GetArrayItem(root, i); 
        if( !item )
            break;

        /* if item is cJSON_Object, then recursive call proc_json */
        if( cJSON_Object == item->type )
        {
            proc_json_items(item);
        }
        else if( cJSON_Array != item->type )
        {
            value = cJSON_Print(item);

            /* light controled by relay */
            if( !strcasecmp(item->string, "hallway") )
            {
                if( strcasestr(value, "on") )
                {
                    //turn_light(LIGHT_HALLWAY, ON);
                    log_nrml("Turn on hallway light\n");
                }
                else if( strcasestr(value, "off") )
                {
                    //turn_light(LIGHT_HALLWAY, OFF);
                    log_nrml("Turn off hallway light\n");
                }
            }
            else if( !strcasecmp(item->string, "livroom_left") )
            {
                if( strcasestr(value, "on") )
                {
                    //turn_light(LIGHT_LVROOM_LEFT, ON);
                    log_nrml("Turn on livingroom left light\n");
                }
                else if( strcasestr(value, "off") )
                {
                    //turn_light(LIGHT_LVROOM_LEFT, OFF);
                    log_nrml("Turn off livingroom left light\n");
                }
            }
            if( !strcasecmp(item->string, "livroom_right") )
            {
                if( strcasestr(value, "on") )
                {
                    //turn_light(LIGHT_LVROOM_RIGHT, ON);
                    log_nrml("Turn on livingroom right light\n");
                }
                else if( strcasestr(value, "off") )
                {
                    //turn_light(LIGHT_LVROOM_RIGHT, OFF);
                    log_nrml("Turn off livingroom right light\n");
                }
            }

            free(value); /* must free it, or it will result memory leak */
        }
    }

}

void sub_message_callback(struct mosquitto *mosq, void *userdata, const struct mosquitto_message *message)
{
    iotd_ctx_t             *ctx = (iotd_ctx_t *)userdata;

    cJSON                  *root = NULL;
    cJSON                  *item;
    char                   *value;


    if ( !message->payloadlen )
    {
        log_err("%s (null)\n", message->topic);
        return ;
    }

    log_dbg("Subscriber receive message: '%s'\n", message->payload);

    root = cJSON_Parse(message->payload);
    if( !root )
    {
        log_err("cJSON_Parse parser failure: %s\n", cJSON_GetErrorPtr());
        return ;
    }

    /* check ID matched or not */
    item = cJSON_GetObjectItem(root, "id");
    if( !item )
    {
        log_err("cJSON_Parse get ID failure: %s\n", cJSON_GetErrorPtr());
        goto OUT;
    }

    value = cJSON_PrintUnformatted(item);
    if( strcasecmp(value, ctx->mqtt_ctx.id) )
    {
        log_warn("cJSON_Parse get ID not matchs [%s<->%s], drop this message!\n", value, ctx->mqtt_ctx.id);
        free(value);
        goto OUT;
    }
    
    free(value); 

    /* proc JSON mesage */
    proc_json_items(root); 

OUT:
    cJSON_Delete(root); /* must delete it, or it will result memory leak */
    return ;
}


void *mqtt_sub_worker(void *args)
{
    struct mosquitto       *mosq;
    bool                    session = true;

    iotd_ctx_t             *ctx = (iotd_ctx_t *)args;
    mqtt_ctx_t             *mqtt_ctx;

    if( !ctx )
    {
        log_err("Invalid input arguments\n");
	return NULL;
    }

    mqtt_ctx = &ctx->mqtt_ctx;


    mosq = mosquitto_new(NULL, session, ctx);
    if( !mosq )
    {
        log_err("mosquitto_new failure\n");
        return NULL;
    }

    /* set connnect to broker username and password  */
    if( strlen(mqtt_ctx->uid)> 0  && strlen(mqtt_ctx->pwd)> 0 )
        mosquitto_username_pw_set(mosq, mqtt_ctx->uid, mqtt_ctx->pwd);

    /* set callback functions */
    mosquitto_connect_callback_set(mosq, sub_connect_callback);
    mosquitto_disconnect_callback_set(mosq, sub_disconnect_callback);
    mosquitto_message_callback_set(mosq, sub_message_callback);

    while( !g_signal.stop )
    { 
        /* connect to MQTT broker  */
        if( mosquitto_connect(mosq, mqtt_ctx->host, mqtt_ctx->port, mqtt_ctx->keepalive) )
        {
            log_err("Subscriber connect to broker[%s:%d] failure: %s\n", mqtt_ctx->host, mqtt_ctx->port, strerror(errno)); 
            msleep(1000);
            continue;
        }

        /* -1: use default timeout 1000ms  1: unused */
        mosquitto_loop_forever(mosq, -1, 1);
    }

    mosquitto_destroy(mosq);
    return NULL;
}