/*******************************************************************************
        form1.c
        Z-World, 2000

        An example of a simple HTTP form generation and parsing
        program.  It includes an example of how to handle interdependent
        variables in the form (see the low and high temperature
        variables).
*******************************************************************************/

/***********************************
 * Configuration                   *
 * -------------                   *
 * All fields in this section must *
 * be altered to match your local  *
 * network settings.               *
 ***********************************/

/*
 * You must change the following values to whatever
 * your local IP address and netmask are. Contact your
 * network administrator for these numbers.
 */
#define MY_IP_ADDRESS   "10.10.6.100"
#define MY_NETMASK      "255.255.255.0"

/*
 * Web server configuration
 */

/*
 * Only one socket and server are needed for a reserved port
 */
#define HTTP_MAXSERVERS 1
#define MAX_TCP_SOCKET_BUFFERS 1

/*
 * Size of the buffer that will be allocated to do error
 * processing during form parsing.  This buffer is allocated
 * in root RAM.  Note that it must be large enough to hold
 * the name, value, and 4 more bytes for each variable in the
 * form.
 *
 * This parameter must be defined in order to use the form
 * generation and parsing functionality.
 */
#define FORM_ERROR_BUF 256

/*
 * Define this if you do not need to use the http_flashspec array.
 * Since this program uses only the ZSERVER.LIB functionality,
 * then it does not need the http_flashspec array.
 */
#define HTTP_NO_FLASHSPEC

/*
 * This program does not need to do any DNS lookups, so it
 * disables them in order to save memory.  Note that resolve()
 * can still handle IP addresses with this option defined, but
 * it can not handle names.
 */
#define DISABLE_DNS

/********************************
 * End of configuration section *
 ********************************/

#memmap xmem
#use "dcrtcp.lib"
#use "http.lib"

/* the default mime type for '/' must be first */
const HttpType http_types[] =
{
   { ".html", "text/html", NULL}
};

/* The following variables will be included in the form */
int temphi;
int tempnow;
int templo;
float humidity;
char fail[21];

/* This function checks the low temperature against the new value for the
 * high temperature to make sure that the low temperature is not higher
 * than the high temperature.  To check against the new high temperature,
 * it must use the value in the error buffer. */
int checkLowTemp(int newval)
{
	char* var;
	char* value;
	long hightemp;

	var = http_finderrbuf("temphi");
	if (var != NULL) {
		http_nextfverr(var, NULL, &value, NULL, NULL);
		hightemp = strtol(value, NULL, 10);
		if (newval <= hightemp) {
			return 0;
		} else {
			return -1;
		}
	} else {
		if (newval <= temphi) {
			return 0;
		} else {
			return -1;
		}
	}
}

/* This function is like the above function, except that it checks the
 * high temperature. */
int checkHighTemp(int newval)
{
	char* var;
	char* value;
	long lowtemp;

	var = http_finderrbuf("templo");
	if (var != NULL) {
		http_nextfverr(var, NULL, &value, NULL, NULL);
		lowtemp = strtol(value, NULL, 10);
		if (newval >= lowtemp) {
			return 0;
		} else {
			return -1;
		}
	} else {
		if (newval <= templo) {
			return 0;
		} else {
			return -1;
		}
	}
}

void main(void)
{
	// Declare the FormVar array to hold form variable information
	FormVar myform[5];
	int var;
	int form;
	// This array lists the options that are possible for the fail variable
	static const char* const fail_options[] = {
		"Email",
		"Page",
		"Email and page",
		"Nothing"
	};

	// Initialize variables
	temphi = 80;
	tempnow = 72;
	templo = 65;
	humidity = 0.3;
	strcpy(fail, "Page");
	
	// Add the form (array of variables)
	form = sspec_addform("myform.html", myform, 5, SERVER_HTTP);

	// Set the title of the form
	sspec_setformtitle(form, "ACME Thermostat Settings");

	// Add the first variable, and set it up with the form
	var = sspec_addvariable("temphi", &temphi, INT16, "%d", SERVER_HTTP);
	var = sspec_addfv(form, var);
	sspec_setfvname(form, var, "High Temp");
	sspec_setfvdesc(form, var, "Maximum in temperature range (60 - 90 &deg;F)");
	sspec_setfvlen(form, var, 5);
	sspec_setfvrange(form, var, 60, 90);
	sspec_setfvcheck(form, var, checkHighTemp);

	// Add the second variable, and set it up with the form
	var = sspec_addvariable("tempnow", &tempnow, INT16, "%d", SERVER_HTTP);
	var = sspec_addfv(form, var);
	sspec_setfvname(form, var, "Current Temp");
	sspec_setfvdesc(form, var, "Current temperature in &deg;F");
	sspec_setfvlen(form, var, 5);
	sspec_setfvreadonly(form, var, 1);

	// Add the third variable, and set it up with the form
	var = sspec_addvariable("templo", &templo, INT16, "%d", SERVER_HTTP);
	var = sspec_addfv(form, var);
	sspec_setfvname(form, var, "Low Temp");
	sspec_setfvdesc(form, var, "Minimum in temperature range (50 - 80 &deg;F)");
	sspec_setfvlen(form, var, 5);
	sspec_setfvrange(form, var, 50, 80);
	sspec_setfvcheck(form, var, checkLowTemp);

	// Add the fourth variable, and set it up with the form
	var = sspec_addvariable("failure", fail, PTR16, "%s", SERVER_HTTP);
	var = sspec_addfv(form, var);
	sspec_setfvname(form, var, "Failure Action");
	sspec_setfvdesc(form, var, "Action to take in case of air-conditioning failure");
	sspec_setfvlen(form, var, 20);
	sspec_setfvoptlist(form, var, fail_options, 4);
	sspec_setfventrytype(form, var, HTML_FORM_PULLDOWN);

	// Add the fifth variable, and set it up with the form
	var = sspec_addvariable("humidity", &humidity, FLOAT32, "%.2f", SERVER_HTTP);
	var = sspec_addfv(form, var);
	sspec_setfvname(form, var, "Humidity");
	sspec_setfvdesc(form, var, "Target humidity (between 0.0 and 1.0)");
	sspec_setfvlen(form, var, 8);
	sspec_setfvfloatrange(form, var, 0.0, 1.0);

	// Create aliases for this form.  This allows the form to be accessed from
	// other locations.
	sspec_aliasspec(form, "index.html");
	sspec_aliasspec(form, "/");

   sock_init();
   http_init();
   tcp_reserveport(80);

   while (1) {
      http_handler();
   }
}
