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/* This file is part of Gamma.
   Copyright (C) 2002, 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 <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 (SCM parmlist, const char *func_name)
{
	char *hostname = NULL;
	char *port = NULL;
	char *dbname = NULL;
	char *user = NULL;
	char *pass = NULL;
	struct gamma_parmdcl dcltab[] = {
		{ "iface",        NULL,          NULL },
		{ "host",         &hostname,     gamma_cvt_string },
		{ "port",         &port,         gamma_cvt_string },
		{ "db",           &dbname,       gamma_cvt_string },
		{ "user",         &user,         gamma_cvt_string },
		{ "pass",         &pass,         gamma_cvt_string },
		{ NULL }
	};
	
	PGconn *pgconn;
	SCM smob;
	struct sql_connect *conn;
	
	gamma_parmlist_parse (parmlist, dcltab, 0, func_name);
	
	pgconn = PQsetdbLogin(hostname, port, NULL, NULL, dbname, user, pass);
	
	if (PQstatus(pgconn) == CONNECTION_BAD) {
		SCM args, pmsg;
		
		free(hostname);
		free(port);
		free(user);
		free(pass);

		pmsg = scm_from_locale_string(PQerrorMessage(pgconn));
		args = scm_list_1(scm_from_locale_string("Cannot connect to the database"));
		PQfinish(pgconn);
		scm_error(gamma_sql_error, func_name,
			  "~A",
			  args,
			  scm_list_2(SCM_BOOL_F, pmsg));
	}

	smob = sql_connect_create("pgsql");
	conn = (struct sql_connect *)SCM_CDR(smob);
	conn->hostname = hostname;
	conn->port = port ? atoi (port) : 0;
	conn->username = user;
	conn->database = dbname;
	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 = SCM_EOL;

	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(val ?
					       scm_from_locale_string(val) :
					       SCM_BOOL_F, 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 = SCM_EOL;
	ExecStatusType stat;
	
	res = PQexec(pgconn, query);
	if (!res)
		scm_error(gamma_sql_error, "sql-query",
			  "~A",
			  scm_list_1(scm_from_locale_string("Error executing PostgreSQL query")),
			  scm_list_2(SCM_BOOL_F,
				     scm_from_locale_string(PQerrorMessage(pgconn))));

	stat = PQresultStatus(res);

	switch (stat) {
	case PGRES_COMMAND_OK:
		/* Successful completion of a command returning no data */
		cell = scm_from_ulong(strtoul(PQcmdTuples(res), NULL, 0));
		break;
	case PGRES_TUPLES_OK:
		/* The query successfully executed */
		cell = result_to_list(res);
		PQclear(res);
		break;
	default:
		scm_error(gamma_sql_error, "sql-query",
			  "~A",
			  scm_list_1(scm_from_locale_string("PostgreSQL error")),
			  scm_list_2(scm_from_uint(stat),
				     scm_from_locale_string(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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