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/* This file is part of guile-sql.
   Copyright (C) 2002 Sergey Poznyakoff

   This program 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 of the License, or (at your
   option) any later version.

   This program 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 this program. If not, see <http://www.gnu.org/licenses/>. */

#ifdef HAVE_CONFIG_H
# include <config.h>
#endif
#include <string.h>
#include <guile-sql.h>
#include <libpq-fe.h>

static SCM
s_pgsql_mark(struct sql_connect *conn)
{
	return SCM_BOOL_F;
}

static scm_sizet
s_pgsql_free(struct sql_connect *conn)
{
	PGconn *pgconn = (PGconn*) conn->data;
	if (!pgconn)
		return 0;
	PQfinish(pgconn);
	return sizeof(pgconn);
}

static SCM
s_pgsql_connect (const char *hostname, int port,
		 const char *dbname, const char *user, const char *pass,
		 const char *why)
{
	PGconn *pgconn;
	char buf[24];
	SCM smob;
	struct sql_connect *conn;
	
	snprintf(buf, sizeof buf, "%d", port);
	pgconn = PQsetdbLogin(hostname, buf, NULL, NULL, dbname, user, pass);
	if (PQstatus(pgconn) == CONNECTION_BAD) {
		SCM args = scm_list_2(scm_makfrom0str("Cannot connect to the database"),
				      scm_makfrom0str(PQerrorMessage(pgconn)));
		PQfinish(pgconn);
		scm_throw(gsql_error, args);
	}

	smob = sql_connect_create("pgsql");
	conn = (struct sql_connect *)SCM_CDR(smob);
	conn->data = pgconn;
	return smob;
}

static SCM
result_to_list(PGresult *res)
{
	int i, j;
	int ntuples = PQntuples(res);
	int nfields = PQnfields(res);
	SCM row_head = SCM_EOL, row_tail;

	for (i = 0; i < ntuples; i++) {
		SCM new_row;
		SCM head = SCM_EOL, tail;

		for (j = 0; j < nfields; j++) {
			char *val = PQgetvalue(res, i, j);
			SCM new_elt = scm_cons(scm_makfrom0str(val), SCM_EOL);
			if (head == SCM_EOL)
				head = new_elt;
			else
				SCM_SETCDR(tail, new_elt);
			tail = new_elt;
		}

		new_row = scm_cons(head, SCM_EOL);
			
		if (row_head == SCM_EOL) 
			row_head = new_row;
		else 
			SCM_SETCDR(row_tail, new_row);
		row_tail = new_row;
	}
	return row_head;
}

static SCM
s_pgsql_query(struct sql_connect *conn, const char *query)
{
	PGconn *pgconn = (PGconn*) conn->data;
	PGresult       *res;
	SCM cell;
	ExecStatusType stat;
	
	res = PQexec(pgconn, query);
	if (!res)
		scm_throw(gsql_error,
			  scm_list_2(scm_makfrom0str("Error executing PostgreSQL query"),
				     scm_makfrom0str(PQerrorMessage(pgconn))));

	stat = PQresultStatus(res);

	switch (stat) {
	case PGRES_COMMAND_OK:
		/* Successful completion of a command returning no data */
		cell = scm_makenum(strtoul(PQcmdTuples(res), NULL, 0));
		break;
	case PGRES_TUPLES_OK:
		/* The query successfully executed */
		cell = result_to_list(res);
		PQclear(res);
		break;
	default:
		scm_throw(gsql_error, scm_list_2(scm_makfrom0str("PostgreSQL error"),
						 scm_makfrom0str(PQresStatus(stat))));
	}

	return cell;
}

static void
s_pgsql_close(struct sql_connect *conn)
{
	PGconn *pgconn = (PGconn*) conn->data;
	if (!pgconn)
		return;
	PQfinish(pgconn);
	conn->data = NULL;
}

struct sql_iface pgsql_iface = {
	"pgsql",
	s_pgsql_mark,
	s_pgsql_free,
	s_pgsql_connect,
	s_pgsql_close,
	s_pgsql_query,
};


	

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