#include <stdio.h>
#include <sys/socket.h>
#include <arpa/inet.h>
#include <stdlib.h>
#include <netdb.h>
#include <string.h>
#include <time.h>
#include <fcntl.h>
#include <syslog.h>
#include <sys/mman.h>
#include <unistd.h>
#include <sys/time.h>

#define BCM2708_PERI_BASE        0x3F000000
#define GPIO_BASE                (BCM2708_PERI_BASE + 0x200000) /* GPIO controller */
#define PAGE_SIZE (4*1024)
#define BLOCK_SIZE (4*1024)

//#define HOST "open.live.bbc.co.uk"
#define HOST "天気予報サーバアドレス"
#define RSSSIZE 8096
#define PAGE "RSSファイル名"
#define PORT 80
#define USERAGENT "HTMLGET 1.0"

// GPIO setup macros. Always use INP_GPIO(x) before using OUT_GPIO(x) or SET_GPIO_ALT(x,y)
#define INP_GPIO(g) *(gpio+((g)/10)) &= ~(7<<(((g)%10)*3))
#define OUT_GPIO(g) *(gpio+((g)/10)) |=  (1<<(((g)%10)*3))
#define SET_GPIO_ALT(g,a) *(gpio+(((g)/10))) |= (((a)<=3?(a)+4:(a)==4?3:2)<<(((g)%10)*3))
#define GPIO_SET *(gpio+7)  // sets   bits which are 1 ignores bits which are 0
#define GPIO_CLR *(gpio+10) // clears bits which are 1 ignores bits which are 0
#define GET_GPIO(g) (*(gpio+13)&(1<<g)) // 0 if LOW, (1<<g) if HIGH
#define GPIO_PULL *(gpio+37) // Pull up/pull down
#define GPIO_PULLCLK0 *(gpio+38) // Pull up/pull down clock

int  mem_fd;
void *gpio_map;
// I/O access
volatile unsigned *gpio;
void setup_io();

int create_tcp_socket();
int speakweather();
char *get_ip(char *host);
char *build_get_query(char *host, char *page);
int get_weather(char *rssbuf, int *index, char *title);

int main(int argc, char **argv)
{
  if (daemon(1,0) == -1) {
      syslog(LOG_USER|LOG_INFO,"failed to launch daemon.\n");
      return -1;
  }
  chdir("/home/pi/cpp/speakweather");

  struct tm *s_time;
  time_t the_time;
  static int timecount=0;
  setup_io();
  INP_GPIO(4);
  INP_GPIO(17);
  OUT_GPIO(17);

  while(1){
    if(GET_GPIO(4) > 0 && timecount==0){
      (void) time(&the_time);
      s_time=localtime(&the_time);
      if(s_time->tm_hour>=6 && s_time->tm_hour<12){
        GPIO_SET = 1<<17;
        if(speakweather()!=0){
          syslog(LOG_USER|LOG_INFO,"speakweather error.");
          break;
        }
        GPIO_CLR = 1<<17;
        timecount=60;
      }
    }else if(timecount>0){
      timecount--;
    }
    sleep(1);
  }
  GPIO_CLR = 1<<17;
  return 0;
}

int speakweather()
{
  struct sockaddr_in *remote;
  int sock;
  int tmpres;
  char *ip;
  char *get;
  char totalbuf[RSSSIZE+1];
  char buf[BUFSIZ+1];
  char titlebuf[BUFSIZ+1];
  char todayweekday[100];
  char todayweekdayjp[100];
  char host[]=HOST;
  char page[]=PAGE;
  char *tempchar;
  int titlenum;
  int index;

  time_t timer;
  struct tm *date;
  timer = time(NULL);
  date = localtime(&timer);
  strftime(todayweekday, sizeof(todayweekday), "%A", date);
  if (strcmp(todayweekday,"Sunday")==0){
    strcpy(todayweekdayjp,"日");
  }else
  if (strcmp(todayweekday,"Monday")==0){
    strcpy(todayweekdayjp,"月");
  }else
  if (strcmp(todayweekday,"Tuesday")==0){
    strcpy(todayweekdayjp,"火");
  }else
  if (strcmp(todayweekday,"Wednesday")==0){
    strcpy(todayweekdayjp,"水");
  }else
  if (strcmp(todayweekday,"Thursday")==0){
    strcpy(todayweekdayjp,"木");
  }else
  if (strcmp(todayweekday,"Friday")==0){
    strcpy(todayweekdayjp,"金");
  }else{
    strcpy(todayweekdayjp,"土");
  }

  sock = create_tcp_socket();
  ip = get_ip(host);
  remote = (struct sockaddr_in *)malloc(sizeof(struct sockaddr_in *));
  remote->sin_family = AF_INET;
  tmpres = inet_pton(AF_INET, ip, (void *)(&(remote->sin_addr.s_addr)));
  if( tmpres < 0)  
  {
    syslog(LOG_USER|LOG_INFO,"Can't set remote->sin_addr.s_addr");
    return -1;
  }else if(tmpres == 0){
    syslog(LOG_USER|LOG_INFO,"%s is not a valid IP addressn", ip);
    return -1;
  }
  remote->sin_port = htons(PORT);

  if(connect(sock, (struct sockaddr *)remote, sizeof(struct sockaddr)) < 0){
    syslog(LOG_USER|LOG_INFO,"Could not connect");
    return -1;
  }
  get = build_get_query(host, page);
  
  //Send the query to the server
  int sent = 0;
  while(sent < strlen(get))
  { 
    tmpres = send(sock, get+sent, strlen(get)-sent, 0);
    if(tmpres == -1){
      syslog(LOG_USER|LOG_INFO,"Can't send query");
    }
    sent += tmpres;
  }
  //now it is time to receive the page
  memset(buf, 0, sizeof(buf));
  memset(totalbuf, 0, sizeof(totalbuf));
  char * htmlcontent;
  while((tmpres = recv(sock, buf, BUFSIZ, 0)) > 0){
    if(strlen(totalbuf)+strlen(buf) < RSSSIZE){
      strcat(totalbuf, buf);
    }
    memset(buf, 0, tmpres);
  }
  if(tmpres < 0)
  {
      syslog(LOG_USER|LOG_INFO,"Error receiving data");
  }

  htmlcontent = totalbuf;
  while(get_weather(htmlcontent, &index, titlebuf)==0){
    if(strstr(titlebuf, todayweekdayjp)!=NULL){
      printf("%s\n",titlebuf);
      system("aplay tenki.wav > /dev/null 2>&1");
      if(strstr(titlebuf,"雨")!=NULL){
        system("aplay ame.wav > /dev/null 2>&1");
        system("aplay kasa.wav > /dev/null 2>&1");
      }else
      if(strstr(titlebuf,"雪")!=NULL){
        system("aplay yuki.wav > /dev/null 2>&1");
      }else
      if(strstr(titlebuf,"曇")!=NULL){
        system("aplay kumori.wav > /dev/null 2>&1");
      }else
      if(strstr(titlebuf,"晴")!=NULL){
        system("aplay hare.wav > /dev/null 2>&1");
      }
      break;
    }
    htmlcontent += index + 15;
  }
  free(get);
  free(remote);
  free(ip);
  close(sock);
  return 0;
}

int create_tcp_socket()
{
  int sock;
  if((sock = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP)) < 0){
    syslog(LOG_USER|LOG_INFO,"Can't create TCP socket");
    exit(1);
  }
  return sock;
}


char *get_ip(char *host)
{
  struct hostent *hent;
  int iplen = 15; //XXX.XXX.XXX.XXX
  char *ip = (char *)malloc(iplen+1);
  memset(ip, 0, iplen+1);
  if((hent = gethostbyname(host)) == NULL)
  {
    syslog(LOG_USER|LOG_INFO,"Can't get IP");
    exit(1);
  }
  if(inet_ntop(AF_INET, (void *)hent->h_addr_list[0], ip, iplen) == NULL)
  {
    syslog(LOG_USER|LOG_INFO,"Can't resolve host");
    exit(1);
  }
  return ip;
}

char *build_get_query(char *host, char *page)
{
  char *query;
  char *getpage = page;
  char tpl[] = "GET /%s HTTP/1.0\r\nHost: %s\r\nUser-Agent: %s\r\n\r\n";
  if(getpage[0] == '/'){
    getpage = getpage + 1;
    syslog(LOG_USER|LOG_INFO,"Removing leading \"/\", converting %s to %s\n", page, getpage);
  }
  // -5 is to consider the %s %s %s in tpl and the ending \0
  query = (char *)malloc(strlen(host)+strlen(getpage)+strlen(USERAGENT)+strlen(tpl)-5);
  sprintf(query, tpl, getpage, host, USERAGENT);
  return query;
}

int get_weather(char *rssbuf, int *index, char *title)
{
  char* ret;
  char* retend;
  ret = strstr(rssbuf, "<title>");
  if(ret!=NULL){
    ret+=7;
    retend = strstr(ret, "</title>");
    if(retend!=NULL && retend-ret<BUFSIZ){
      strncpy(title, ret, retend-ret);
      *index=retend-rssbuf;
      return 0;
    }
  }
  return -1;
}

//
// Set up a memory regions to access GPIO
//
void setup_io()
{
   /* open /dev/mem */
   if ((mem_fd = open("/dev/mem", O_RDWR|O_SYNC) ) < 0) {
      syslog(LOG_USER|LOG_INFO,"can't open /dev/mem ");
      exit(-1);
   }

   /* mmap GPIO */
   gpio_map = mmap(
      NULL,             //Any adddress in our space will do
      BLOCK_SIZE,       //Map length
      PROT_READ|PROT_WRITE,// Enable reading & writting to mapped memory
      MAP_SHARED,       //Shared with other processes
      mem_fd,           //File to map
      GPIO_BASE         //Offset to GPIO peripheral
   );

   close(mem_fd); //No need to keep mem_fd open after mmap

   if (gpio_map == MAP_FAILED) {
      syslog(LOG_USER|LOG_INFO,"mmap error %d", (int)gpio_map);//errno also set!
      exit(-1);
   }

   // Always use volatile pointer!
   gpio = (volatile unsigned *)gpio_map;


} // setup_io

#! /bin/sh
### BEGIN INIT INFO
# Provides:          speakweather
# Required-Start:    $remote_fs $syslog
# Required-Stop:     $remote_fs $syslog
# Default-Start:     2 3 4 5
# Default-Stop:      0 1 6
### END INIT INFO

PATH=/sbin:/usr/sbin:/bin:/usr/bin
DESC="speakweather"
NAME=speakweather
DAEMON=/home/pi/cpp/speakweather/$NAME
SCRIPTNAME=/etc/init.d/$NAME

# Exit if the package is not installed
[ -x "$DAEMON" ] || exit 0

# Define LSB log_* functions.
# Depend on lsb-base (>= 3.2-14) to ensure that this file is present
# and status_of_proc is working.
. /lib/lsb/init-functions

#
# Function that starts the daemon/service
#
do_start()
{
    # Return
    #   0 if daemon has been started
    #   1 if daemon was already running
    #   2 if daemon could not be started
    start-stop-daemon --start --quiet --exec $DAEMON --test > /dev/null \
            || return 1
    start-stop-daemon --start --quiet --exec $DAEMON \
            || return 2
    return 0
}

#
# Function that stops the daemon/service
#
do_stop()
{
    # Return
    #   0 if daemon has been stopped
    #   1 if daemon was already stopped
    #   2 if daemon could not be stopped
    #   other if a failure occurred
    start-stop-daemon --stop --quiet --name $NAME
    RETVAL="$?"
    return "$RETVAL"
}

case "$1" in
  start)
    do_start
    ;;
  stop)
    do_stop
    ;;
  status)
    status_of_proc "$DAEMON" "$NAME" && exit 0 || exit $?
    ;;
  *)
    echo "Usage: $SCRIPTNAME {start|stop|status}" >&2
    exit 3
    ;;
esac

:

pi@raspberrypi ~ $ sudo update-rc.d speakweather defaults
update-rc.d: using dependency based boot sequencing
pi@raspberrypi ~ $ ls /etc/rc[0-6].d/*speakweather*
/etc/rc0.d/K01speakweather  /etc/rc2.d/S02speakweather  /etc/rc4.d/S02speakweather  /etc/rc6.d/K01speakweather
/etc/rc1.d/K01speakweather  /etc/rc3.d/S02speakweather  /etc/rc5.d/S02speakweather

pi@raspberrypi ~ $ sudo service speakweather start
pi@raspberrypi ~ $ sudo service speakweather status
[ ok ] speakweather is running.
pi@raspberrypi ~ $ sudo service speakweather stop
pi@raspberrypi ~ $ sudo service speakweather status
[FAIL] speakweather is not running ... failed!