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/* This file is part of Gamma.
   Copyright (C) 2002, 2005, 2010 Sergey Poznyakoff

   Gamma is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 3, or (at your option)
   any later version.

   Gamma is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with Gamma.  If not, see <http://www.gnu.org/licenses/>. */

#ifdef HAVE_CONFIG_H
# include <config.h>
#endif
#include <string.h>
#include <guile-sql.h>
#include <app.h>
#include <stdio.h>

static int num_iface;
static struct sql_iface sql_iftab[MAX_IFACES];

SCM_GLOBAL_SYMBOL (gamma_sql_error, "sql-error");

static long sql_connect_tag = -1;

/* SMOB functions: */
static SCM
sql_connect_mark (SCM connect_smob)
{
	struct sql_connect *conn = (struct sql_connect *)SCM_CDR(connect_smob);
	return sql_iftab[conn->iface].mark(conn);
}

static scm_sizet
sql_connect_free (SCM connect_smob)
{
	scm_sizet size = sizeof(struct sql_connect);
	struct sql_connect *conn = (struct sql_connect *)SCM_CDR(connect_smob);
	size += sql_iftab[conn->iface].free(conn);
	if (conn->hostname)
		free(conn->hostname);
	if (conn->username)
		free(conn->username);
	if (conn->database)
		free(conn->database);
	scm_gc_free(conn, sizeof *conn, "SQL connection");
	return size;
}

static int
sql_connect_print (SCM connect_smob, SCM port, scm_print_state * pstate)
{
	struct sql_connect *conn = (struct sql_connect *)SCM_CDR(connect_smob);
	scm_puts("#<SQL connection (", port);
	scm_puts(sql_iftab[conn->iface].name, port);
	scm_puts(")", port);
	if (!conn->data)
		scm_puts("not connected", port);
	else {
		static const char *unspecified = "<unspecified>";
		scm_puts(conn->username ? conn->username : unspecified, port);
		scm_puts("@", port);
		scm_puts(conn->hostname ? conn->hostname : unspecified, port);
		scm_puts(":", port);
		scm_intprint(conn->port, 10, port);
		scm_puts(" ", port);
		scm_puts(conn->database ? conn->database : unspecified, port);
	};
	scm_puts (">", port);
	return 1;
}

static int
sql_find_iface(const char *name)
{	
	int iface;
	
	for (iface = 0; iface < num_iface; iface++) 
		if (strcmp(sql_iftab[iface].name, name) == 0)
			return iface;
	return -1;
}

SCM
sql_connect_create (char *name)
{
	struct sql_connect *conn;
	int iface = sql_find_iface(name);
	if (iface < 0) 
		scm_misc_error("sql_connect_create",
			       "Unknown SQL interface ~S",
			       scm_list_1(scm_from_locale_string(name)));
	
	conn = scm_gc_malloc (sizeof (*conn), "sql_connect");
	memset(conn, 0, sizeof *conn);
	conn->iface = iface;
	SCM_RETURN_NEWSMOB (sql_connect_tag, conn);
}

static int
scm_is_sql_connect (SCM scm)
{
	return SCM_NIMP (scm) && SCM_CAR (scm) == (SCM) sql_connect_tag;
}

/* Interface */

static void
gamma_cvt_iface(SCM inval, void *outval, const char *func_name)
{
	int iface;
	
	if (scm_is_integer(inval)) 
		iface = scm_to_int(inval);
	else if (scm_is_string(inval)) {
		char *s = scm_to_locale_string(inval);
		iface = sql_find_iface(s);
		free(s);
	} else
		SCM_ASSERT(0, inval, SCM_ARG1, func_name);

	if (iface < 0 || iface >= num_iface) 
		scm_misc_error(func_name,
			       "Argument ~S (~S) out of range",
			       scm_list_2(scm_from_int(1),
					  inval));
	*(int*)outval = iface;
}


SCM_DEFINE_PUBLIC (sql_open_connection, "sql-open-connection", 1, 0, 0,
		   (SCM param),
"Connect to a database.  Take connection parameters from @var{param}, "
"which must be a list of conses.  In each cons, the @samp{car} contains "
"a @dfn{key} identifying the parameter, and the @samp{cdr} supplies the "
"value for that parameter.\n"
"\n"
"Valid keys are:\n"
"@table @asis\n"
"@item #:iface\n"
"Defines the type of the @acronym{SQL} interface (either @samp{mysql} or "
"@samp{postgres}.\n"
"@item #:host\n"
"Server host name.\n"
"@item #:port\n"
"Port number on @samp{#:host}.\n"
"@item #:socket\n"
"Socket path, if the server is listening on a UNIX socket.  Either\n"
"@samp{#:port} or @samp{#:socket} may be given, but not both.\n"
"@item #:user\n"
"Sets the @acronym{SQL} user name.\n"
"@item #:pass\n"
"Sets the password for @samp{#:user}\n"
"@item #:ssl-cert\n"
"Full pathname of the @acronym{SSL} certificate to use (MySQL only).\n"
"@item #:config-file\n"
"Read missing parameters from the specified file (MySQL only).\n"
"@item #:config-group\n"
"Read the specified group in the config file (MySQL only).\n"
"@end table\n")
#define FUNC_NAME s_sql_open_connection
{
	int iface;

	struct gamma_parmdcl dcltab[] = {
		{ "iface",        &iface,          gamma_cvt_iface },
		{ NULL }
	};

	SCM smob;

	SCM_ASSERT(scm_is_pair(param), param, SCM_ARG1, FUNC_NAME);
	gamma_parmlist_parse (param, dcltab,
			      GAMMA_PARMLIST_IGNORE_UNKNOWN, FUNC_NAME);
	
	smob = sql_iftab[iface].connect(param, FUNC_NAME);
	
	return smob;
}
#undef FUNC_NAME

SCM_DEFINE_PUBLIC (sql_close_connection, "sql-close-connection", 1, 0, 0,
		   (SCM conn),
		   "Close connection to a database.")
#define FUNC_NAME s_sql_close_connection
{
	struct sql_connect *cp;
	SCM_ASSERT(scm_is_sql_connect(conn), conn, SCM_ARG1, FUNC_NAME);
	cp = (struct sql_connect *)SCM_CDR(conn);
	sql_iftab[cp->iface].close(cp);
	return SCM_UNSPECIFIED;
}
#undef FUNC_NAME

SCM_DEFINE_PUBLIC (sql_query, "sql-query", 2, 0, 0,
		   (SCM conn, SCM query),
"Send the SQL query @var{query} to the server using connection @var{conn} \
and return the result.\n\
If @var{query} is a @samp{SELECT}, or similar query, returning tuples, the \
return value is a list of rows.  Each row is a list of values, one for each \
column.  All values are returned as strings.  NULL values are returned as \
@samp{#f}.\n\n\
If @var{query} is an @samp{UPDATE} (or a similar query), @code{sql-query} \
returns number of rows affected by the query.\n")
#define FUNC_NAME s_sql_query
{
	struct sql_connect *conn_ptr;
	char *query_ptr;
	SCM ret;
	
	SCM_ASSERT(scm_is_sql_connect(conn), conn, SCM_ARG1, FUNC_NAME);
	SCM_ASSERT(scm_is_string(query), query, SCM_ARG2, FUNC_NAME);
	conn_ptr = (struct sql_connect *)SCM_CDR(conn);
	query_ptr = scm_to_locale_string(query);
	ret = sql_iftab[conn_ptr->iface].query(conn_ptr, query_ptr);
	free(query_ptr);
	return ret;
}
#undef FUNC_NAME

int
sql_register_iface(struct sql_iface *ifp)
{
	int n = sql_find_iface(ifp->name);
	if (n != -1)
		return n;
	if (num_iface >= MAX_IFACES)
		scm_misc_error("sql_register_iface",
			       "Too many ifaces registered",
			       SCM_EOL);
	memcpy(&sql_iftab[num_iface], ifp, sizeof sql_iftab[0]);
	sql_iftab[num_iface].name = strdup(ifp->name);
	return num_iface++;
}

void
gsql_conn_init()
{
	if (sql_connect_tag == -1) {
		sql_connect_tag = scm_make_smob_type ("sql_connect",
					      sizeof (struct sql_connect));
		scm_set_smob_mark (sql_connect_tag, sql_connect_mark);
		scm_set_smob_free (sql_connect_tag, sql_connect_free);
		scm_set_smob_print (sql_connect_tag, sql_connect_print);
	}
#ifndef SCM_MAGIC_SNARFER
# include <gsql_conn.x>
#endif
}


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