/*
 *	aegis - project change supervisor
 *	Copyright (C) 2000, 2001 Peter Miller;
 *	All rights reserved.
 *
 *	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 2 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, write to the Free Software
 *	Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111, USA.
 *
 * MANIFEST: functions to manipulate uconf values
 */

#include <aer/value/error.h>
#include <aer/value/integer.h>
#include <aer/value/list.h>
#include <aer/value/string.h>
#include <aer/value/struct.h>
#include <aer/value/uconf.h>
#include <getpw_cache.h>
#include <os.h>
#include <sub.h>
#include <trace.h>
#include <user.h>


static rpt_value_ty *build_result _((struct passwd *));

static rpt_value_ty *
build_result(pw)
	struct passwd	*pw;
{
	string_ty	*path;
	int		err;
	uconf		tmp;
	rpt_value_ty	*result;
	string_ty	*name;
	rpt_value_ty	*value;
	string_ty	*s;

	trace(("build_struct()\n{\n"/*}*/));
	path = str_format("%s/.aegisrc", pw->pw_dir);

	/*
	 * Read the file if it exists and is readable,
	 * otherwise default lots of things.
	 */
	os_become_orig();
	err = os_readable(path);
	if (err)
	{
		sub_context_ty  *scp;

		os_become_undo();
		scp = sub_context_new();
		sub_errno_setx(scp, err);
		sub_var_set_string(scp, "File_Name", path);
		str_free(path);
		s = subst_intl(scp, "stat $filename: $errno");
		sub_context_delete(scp);
		result = rpt_value_error((void *)0, s);
		str_free(s);
		goto done;
	}
	tmp = uconf_read_file(path);
	os_become_undo();
	if (!tmp->email_address)
		tmp->email_address = str_from_c(pw->pw_name);
	str_free(path);

	/*
	 * Convert the data
	 */
	result = uconf_type.convert(&tmp);
	uconf_type.free(tmp);

	/*
	 * Insert the user name into the result.
	 */
	trace(("name\n"));
	name = str_from_c("name");
	s = str_from_c(pw->pw_name);
	value = rpt_value_string(s);
	str_free(s);
	rpt_value_struct__set(result, name, value);
	str_free(name);
	rpt_value_free(value);

	/*
	 * All done.
	 */
	done:
	trace(("return %08lX;\n", (long)result));
	trace((/*{*/"}\n"));
	return result;
}


static rpt_value_ty *lookup _((rpt_value_ty *, rpt_value_ty *, int));

static rpt_value_ty *
lookup(lhs, rhs, lvalue)
	rpt_value_ty	*lhs;
	rpt_value_ty	*rhs;
	int		lvalue;
{
	rpt_value_ty	*rhs2;
	rpt_value_ty	*result;
	struct passwd	*pw;
	string_ty	*s;

	trace(("value_uconf::lookup()\n{\n"/*}*/));
	rhs2 = rpt_value_arithmetic(rhs);
	if (rhs2->method->type == rpt_value_type_integer)
	{
		int		uid;

		uid = rpt_value_integer_query(rhs2);
		pw = getpwuid_cached(uid);
		if (pw)
			result = build_result(pw);
		else
		{
			sub_context_ty  *scp;
		
			scp = sub_context_new();
			sub_var_set_long(scp, "Number", uid);
			s = subst_intl(scp, i18n("uid $number unknown"));
			sub_context_delete(scp);
			result = rpt_value_error((struct rpt_pos_ty *)0, s);
			str_free(s);
		}
	}
	else
	{
		rpt_value_free(rhs2);
		rhs2 = rpt_value_stringize(rhs);
		if (rhs2->method->type == rpt_value_type_string)
		{
			string_ty       *name;

			name = rpt_value_string_query(rhs2);
			pw = getpwnam_cached(name);
			if (pw)
				result = build_result(pw);
			else
			{
				sub_context_ty  *scp;

				scp = sub_context_new();
				sub_var_set_string(scp, "Name", name);
				s = subst_intl(scp, i18n("user $name unknown"));
				sub_context_delete(scp);
				result = rpt_value_error((struct rpt_pos_ty *)0, s);
				str_free(s);
			}
		}
		else
		{
			sub_context_ty	*scp;

			scp = sub_context_new();
			sub_var_set_charstar(scp, "Name1", "user");
			sub_var_set_charstar(scp, "Name2", rhs->method->name);
			s = subst_intl(scp, i18n("illegal lookup ($name1[$name2])"));
			sub_context_delete(scp);
			result = rpt_value_error((struct rpt_pos_ty *)0, s);
			str_free(s);
		}
		rpt_value_free(rhs2);
	}
	trace(("return %08lX;\n", (long)result));
	trace((/*{*/"}\n"));
	return result;
}


static rpt_value_ty *keys _((rpt_value_ty *));

static rpt_value_ty *
keys(vp)
	rpt_value_ty	*vp;
{
	rpt_value_ty	*result;

	/*
         * We always return the empty list.  I suppose we could read the
         * passwd file and return that as the list.  Or worse, I could
         * go through looking for .aegisrc files in each home directory,
         * and return that as the list.  There doesn't seem to be a real
         * need, so only implement something if folks yelp.
	 */
	result = rpt_value_list();
	return result;
}


static rpt_value_ty *count _((rpt_value_ty *));

static rpt_value_ty *
count(vp)
	rpt_value_ty	*vp;
{
	/*
	 * See rpt_value_uconf::keys comment.
	 * If you change that function, change this function too.
	 */
	return rpt_value_integer(0);
}


static char *type_of _((rpt_value_ty *));

static char *
type_of(this)
	rpt_value_ty	*this;
{
	return "struct";
}


static rpt_value_method_ty method =
{
	sizeof(rpt_value_ty),
	"user",
	rpt_value_type_structure,
	0, /* construct */
	0, /* destruct */
	0, /* arithmetic */
	0, /* stringize */
	0, /* booleanize */
	lookup,
	keys,
	count,
	type_of,
	0, /* undefer */
};


rpt_value_ty *
rpt_value_uconf()
{
	static rpt_value_ty *vp;

	if (!vp)
		vp = rpt_value_alloc(&method);
	return rpt_value_copy(vp);
}