-- Prosody IM
-- Copyright (C) 2008-2010 Matthew Wild
-- Copyright (C) 2008-2010 Waqas Hussain
--
-- This project is MIT/X11 licensed. Please see the
-- COPYING file in the source package for more information.
--

local modulemanager = require "core.modulemanager";
local log = require "util.logger".init("usermanager");
local type = type;
local ipairs = ipairs;
local jid_bare = require "util.jid".bare;
local jid_prep = require "util.jid".prep;
local config = require "core.configmanager";
local sasl_new = require "util.sasl".new;
local storagemanager = require "core.storagemanager";

local prosody = _G.prosody;
local hosts = prosody.hosts;

local setmetatable = setmetatable;

local default_provider = "internal_plain";

local _ENV = nil;
-- luacheck: std none

local function new_null_provider()
	local function dummy() return nil, "method not implemented"; end;
	local function dummy_get_sasl_handler() return sasl_new(nil, {}); end
	return setmetatable({name = "null", get_sasl_handler = dummy_get_sasl_handler}, {
		__index = function(self, method) return dummy; end --luacheck: ignore 212
	});
end

local provider_mt = { __index = new_null_provider() };

local function initialize_host(host)
	local host_session = hosts[host];
	if host_session.type ~= "local" then return; end

	host_session.events.add_handler("item-added/auth-provider", function (event)
		local provider = event.item;
		local auth_provider = config.get(host, "authentication") or default_provider;
		if config.get(host, "anonymous_login") then
			log("error", "Deprecated config option 'anonymous_login'. Use authentication = 'anonymous' instead.");
			auth_provider = "anonymous";
		end -- COMPAT 0.7
		if provider.name == auth_provider then
			host_session.users = setmetatable(provider, provider_mt);
		end
		if host_session.users ~= nil and host_session.users.name ~= nil then
			log("debug", "Host '%s' now set to use user provider '%s'", host, host_session.users.name);
		end
	end);
	host_session.events.add_handler("item-removed/auth-provider", function (event)
		local provider = event.item;
		if host_session.users == provider then
			host_session.users = new_null_provider();
		end
	end);
	host_session.users = new_null_provider(); -- Start with the default usermanager provider
	local auth_provider = config.get(host, "authentication") or default_provider;
	if config.get(host, "anonymous_login") then auth_provider = "anonymous"; end -- COMPAT 0.7
	if auth_provider ~= "null" then
		modulemanager.load(host, "auth_"..auth_provider);
	end
end;
prosody.events.add_handler("host-activated", initialize_host, 100);

local function test_password(username, host, password)
	return hosts[host].users.test_password(username, password);
end

local function get_password(username, host)
	return hosts[host].users.get_password(username);
end

local function set_password(username, password, host, resource)
	local ok, err = hosts[host].users.set_password(username, password);
	if ok then
		prosody.events.fire_event("user-password-changed", { username = username, host = host, resource = resource });
	end
	return ok, err;
end

local function user_exists(username, host)
	if hosts[host].sessions[username] then return true; end
	return hosts[host].users.user_exists(username);
end

local function create_user(username, password, host)
	return hosts[host].users.create_user(username, password);
end

local function delete_user(username, host)
	local ok, err = hosts[host].users.delete_user(username);
	if not ok then return nil, err; end
	prosody.events.fire_event("user-deleted", { username = username, host = host });
	return storagemanager.purge(username, host);
end

local function users(host)
	return hosts[host].users.users();
end

local function get_sasl_handler(host, session)
	return hosts[host].users.get_sasl_handler(session);
end

local function get_provider(host)
	return hosts[host].users;
end

local function is_admin(jid, host)
	if host and not hosts[host] then return false; end
	if type(jid) ~= "string" then return false; end

	jid = jid_bare(jid);
	host = host or "*";

	local host_admins = config.get(host, "admins");
	local global_admins = config.get("*", "admins");

	if host_admins and host_admins ~= global_admins then
		if type(host_admins) == "table" then
			for _,admin in ipairs(host_admins) do
				if jid_prep(admin) == jid then
					return true;
				end
			end
		elseif host_admins then
			log("error", "Option 'admins' for host '%s' is not a list", host);
		end
	end

	if global_admins then
		if type(global_admins) == "table" then
			for _,admin in ipairs(global_admins) do
				if jid_prep(admin) == jid then
					return true;
				end
			end
		elseif global_admins then
			log("error", "Global option 'admins' is not a list");
		end
	end

	-- Still not an admin, check with auth provider
	if host ~= "*" and hosts[host].users and hosts[host].users.is_admin then
		return hosts[host].users.is_admin(jid);
	end
	return false;
end

return {
	new_null_provider = new_null_provider;
	initialize_host = initialize_host;
	test_password = test_password;
	get_password = get_password;
	set_password = set_password;
	user_exists = user_exists;
	create_user = create_user;
	delete_user = delete_user;
	users = users;
	get_sasl_handler = get_sasl_handler;
	get_provider = get_provider;
	is_admin = is_admin;
};