local error_mt = { __name = "error" };

function error_mt:__tostring()

	return ("error<%s:%s:%s>"):format(self.type, self.condition, self.text or "");

end

local function is_err(e)

	return getmetatable(e) == error_mt;

end

local function new(e, context, registry)

	local template = (registry and registry[e]) or e or {};

	return setmetatable({

		type = template.type or "cancel";

		condition = template.condition or "undefined-condition";

		text = template.text;

		code = template.code or 500;

		context = context or template.context or { _error_id = e };

	}, error_mt);

end

local function coerce(ok, err, ...)

	if ok or is_err(err) then

		return ok, err, ...;

	end

	local new_err = setmetatable({

		native = err;

		type = "cancel";

		condition = "undefined-condition";

	}, error_mt);

	return ok, new_err, ...;

end

local function from_stanza(stanza, context)

	local error_type, condition, text = stanza:get_error();

	return setmetatable({

		type = error_type or "cancel";

		condition = condition or "undefined-condition";

		text = text;

		context = context or { stanza = stanza };

	}, error_mt);

end

return {

	new = new;

	coerce = coerce;

	is_err = is_err;

	from_stanza = from_stanza;

}