local m = mtimer
local S = m.translator


-- Build the formspec frame
--
-- With this function the size and title of  a formspec are set. It also adds
-- the default buttons to the formspec. All calculations for the buttons are
-- done automatically but directly correlate to the size of the formspec.
--
-- All formspecs are by minimum 6 units wide and 2 units high to allow enough
-- space for the buttons and the button texts.
--
-- @param width  The width of the formspec in formspec units
-- @param height The height of the formspec in formspec units
-- @param title  The title for the formspec (a label shown on the formspec)
-- @return string the constructed “frame”
mtimer.build_frame = function (width, height, title)
    local formspec_frame = [[
    size[+width,+height] label[0,-0.125;+title]
    container[0,+position]
    button_exit[+exitpos,0;+bwidth,1;exit;]]..S('Exit')..[[]
    button[+mainpos,0;+bwidth,1;main_menu;]]..S('Main Menu')..[[]
    button[+defaultpos,0;+bwidth,1;default;]]..S('Default')..[[]
    container_end[]
    ]]

    local width = width < 6 and 6 or width
    local height = height < 2 and 2 or height

    return formspec_frame:gsub('%+%a+', {
        ['+width'] = width,
        ['+height'] = height,
        ['+title'] = minetest.formspec_escape('[mTimer] '..title),
        ['+position'] = height-0.7,
        ['+bwidth'] = width/3,
        ['+exitpos'] = 0,
        ['+mainpos'] = width/3,
        ['+defaultpos'] = (width/3)*2
    })
end