-- Copyright (C) 2008 Matthew Wild

-- Copyright (C) 2008 Waqas Hussain

-- 

-- 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., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.

--

local _G = _G;

local 	setmetatable, loadfile, pcall, rawget, rawset, io = 

		setmetatable, loadfile, pcall, rawget, rawset, io;

module "configmanager"

local parsers = {};

local config = { ["*"] = { core = {} } };

local global_config = config["*"];

-- When host not found, use global

setmetatable(config, { __index = function () return global_config; end});

local host_mt = { __index = global_config };

-- When key not found in section, check key in global's section

function section_mt(section_name)

	return { __index = 	function (t, k)

									local section = rawget(global_config, section_name);

									if not section then return nil; end

									return section[k];

							end };

end

function getconfig()

	return config;

end

function get(host, section, key)

	local sec = config[host][section];

	if sec then

		return sec[key];

	end

	return nil;

end

function set(host, section, key, value)

	if host and section and key then

		local hostconfig = rawget(config, host);

		if not hostconfig then

			hostconfig = rawset(config, host, setmetatable({}, host_mt))[host];

		end

		if not rawget(hostconfig, section) then

			hostconfig[section] = setmetatable({}, section_mt(section));

		end

		hostconfig[section][key] = value;

		return true;

	end

	return false;

end

function load(filename, format)

	format = format or filename:match("%w+$");

	if parsers[format] and parsers[format].load then

		local f, err = io.open(filename);

		if f then 

			local ok, err = parsers[format].load(f:read("*a"));

			f:close();

			return ok, err;

		end

		return f, err;

	end

	if not format then

		return nil, "no parser specified";

	else

		return nil, "no parser for "..(format);

	end

end

function save(filename, format)

end

function addparser(format, parser)

	if format and parser then

		parsers[format] = parser;

	end

end

-- Built-in Lua parser

do

	local loadstring, pcall, setmetatable = _G.loadstring, _G.pcall, _G.setmetatable;

	local setfenv, rawget, tostring = _G.setfenv, _G.rawget, _G.tostring;

	parsers.lua = {};

	function parsers.lua.load(data)

		local env;

		env = setmetatable({ Host = true; host = true; }, { __index = function (t, k)

												return rawget(_G, k) or

														function (settings_table)

															config[__currenthost or "*"][k] = settings_table;

														end;

										end,

								__newindex = function (t, k, v)

											set(env.__currenthost or "*", "core", k, v);

										end});

		function env.Host(name)

			rawset(env, "__currenthost", name);

			set(name or "*", "core", "defined", true);

		end

		env.host = env.Host;

		local chunk, err = loadstring(data);

		if not chunk then

			return nil, err;

		end

		setfenv(chunk, env);

		local ok, err = pcall(chunk);

		if not ok then

			return nil, err;

		end

		return true;

	end

end

return _M;