---------------------------------------------------------------------------
-- @author Uli Schlachter
-- @copyright 2010 Uli Schlachter
-- @release @AWESOME_VERSION@
-- @classmod wibox.widget.systray
---------------------------------------------------------------------------

local wbase = require("wibox.widget.base")
local beautiful = require("beautiful")
local capi = { awesome = awesome }
local setmetatable = setmetatable
local error = error
local abs = math.abs

local systray = { mt = {} }

local horizontal = true
local base_size = nil
local reverse = false

function systray:draw(context, cr, width, height)
    local x, y, _, _ = wbase.rect_to_device_geometry(cr, 0, 0, width, height)
    local num_entries = capi.awesome.systray()
    local bg = beautiful.bg_systray or beautiful.bg_normal or "#000000"
    local spacing = beautiful.systray_icon_spacing or 0

    if context and not context.wibox then
        error("The systray widget can only be placed inside a wibox.")
    end

    -- Figure out if the cairo context is rotated
    local dir_x, dir_y = cr:user_to_device_distance(1, 0)
    local is_rotated = abs(dir_x) < abs(dir_y)

    local in_dir, ortho, base
    if horizontal then
        in_dir, ortho = width, height
        is_rotated = not is_rotated
    else
        ortho, in_dir = width, height
    end
    if ortho * num_entries <= in_dir then
        base = ortho
    else
        base = in_dir / num_entries
    end
    capi.awesome.systray(context.wibox.drawin, math.ceil(x), math.ceil(y),
                         base, is_rotated, bg, reverse, spacing)
end

function systray:fit(_, width, height)
    local num_entries = capi.awesome.systray()
    local base = base_size
    local spacing = beautiful.systray_icon_spacing or 0
    if num_entries == 0 then
        return 0, 0
    end
    if base == nil then
        if width < height then
            base = width
        else
            base = height
        end
    end
    base = base + spacing
    if horizontal then
        return base * num_entries - spacing, base
    end
    return base, base * num_entries - spacing
end

local function new(revers)
    local ret = wbase.make_widget()

    ret.fit = systray.fit
    ret.draw = systray.draw
    ret.set_base_size = function(_, size) base_size = size end
    ret.set_horizontal = function(_, horiz) horizontal = horiz end
    ret.set_reverse = function(arg) reverse = arg end

    if revers then
        ret:set_reverse(true)
    end

    capi.awesome.connect_signal("systray::update", function()
        ret:emit_signal("widget::layout_changed")
        ret:emit_signal("widget::redraw_needed")
    end)

    return ret
end

local instance
function systray.mt:__call(...)
    if not instance then
        instance = new(...)
    end
    return instance
end

return setmetatable(systray, systray.mt)

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