------------------------------------------------------------------------------
--
--  LGI Lua-side core.
--
--  Copyright (c) 2010, 2011 Pavel Holejsovsky
--  Licensed under the MIT license:
--  http://www.opensource.org/licenses/mit-license.php
--
------------------------------------------------------------------------------

local assert, require, pcall, setmetatable, pairs, type, error, tostring,
_VERSION, jit
   = assert, require, pcall, setmetatable, pairs, type, error, tostring,
_VERSION, rawget(_G, 'jit')

local package = require 'package'

-- Require core lgi utilities, used during bootstrap.
local core = require 'lgi.core'

-- Create lgi table, containing the module.
local lgi = { _NAME = 'lgi', _VERSION = require 'lgi.version' }

-- Forward selected core methods into external interface.
for _, name in pairs { 'yield', 'lock', 'enter', 'leave' } do
   lgi[name] = core[name]
end

-- If global package 'bytes' does not exist (i.e. not provided
-- externally), use our internal (although incomplete) implementation.
local ok, bytes = pcall(require, 'bytes')
if not ok or not bytes then
   package.loaded.bytes = core.bytes
end

-- Prepare logging support.  'log' is module-exported table, containing all
-- functionality related to logging wrapped around GLib g_log facility.
lgi.log = require 'lgi.log'

-- For the rest of bootstrap, prepare logging to lgi domain.
local log = lgi.log.domain('lgi')

-- Repository, table with all loaded namespaces.  Its metatable takes care of
-- loading on-demand.  Created by C-side bootstrap.
local repo = core.repo

local namespace = require 'lgi.namespace'
lgi.require = namespace.require

-- Install 'lgi.package' method.
lgi.package = require('lgi.package').ensure

-- Add assert override, which accepts not only text message but any
-- kind of error object.
function lgi.assert(cond, ...)
   if cond then return cond, ... end
   local err = ...
   if _VERSION == 'Lua 5.1' and not jit then
      -- Lua 5.1 does not support displaying message of non-string
      -- errors on the commandline interpreter, so better stringize
      -- the error message right now.
      err = tostring(err)
   end
   error(err, 2)
end

-- Install metatable into repo table, so that on-demand loading works.
setmetatable(repo, { __index = function(_, name)
				  return lgi.require(name)
			       end })

-- Create lazy-loading components for base gobject entities.
assert(core.gi.require ('GLib', '2.0'))
assert(core.gi.require ('GObject', '2.0'))
repo.GObject._precondition = {}
for _, name in pairs { 'Type', 'Value', 'Closure', 'Object' } do
   repo.GObject._precondition[name] = 'GObject-' .. name
end
repo.GObject._precondition.InitiallyUnowned = 'GObject-Object'

-- Create lazy-loading components for GLib primitives.
repo.GLib._precondition = {}
repo.GLib._precondition.Error = 'GLib-Error'
repo.GLib._precondition.Bytes = 'GLib-Bytes'
repo.GLib._precondition.Timer = 'GLib-Timer'
repo.GLib._precondition.MarkupParser = 'GLib-Markup'
repo.GLib._precondition.MarkupParseContext = 'GLib-Markup'
for _, name in pairs { 'Variant', 'VariantType', 'VariantBuilder' } do
   repo.GLib._precondition[name] = 'GLib-Variant'
end

-- Access to module proxies the whole repo, so that lgi.'namespace'
-- notation works.
return setmetatable(lgi, { __index = repo })
