--   This file is part of Reno desktop.
--
--  Reno desktop is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version.
--
--  Reno desktop is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
--
--  You should have received a copy of the GNU General Public License along with Reno desktop. If not, see <https://www.gnu.org/licenses/>. 
local awful = require("awful")
local gears = require("gears")
local awmtk2 = require("awmtk2")
local beautiful = require("beautiful")
local wibox = require("wibox")
local json = require("dkjson")
local try_blur = require("imagemagick_blur")
local ask = require("asckey")

local bgimagegen = function(path)
    return function(cont,cr,width,height)
        local s = gears.surface.load_uncached_silently(
            path
        )
        local bg_width,bg_height = gears.surface.get_size(s)
        local scale = height/bg_height
        if width/bg_width > scale then
            scale = width/bg_width
        end
        cr:translate((width - (bg_width*scale))/2,(height - (bg_height*scale))/2)
        cr:rectangle(0,0, (bg_width*scale), (bg_height*scale))
        cr:clip()
        cr:scale(scale,scale)
        cr:set_source_surface(s)
        cr:paint()
    end
end
local function _preload(args)
    local style = awmtk2.create_style("supermenu",
        awmtk2.generic.composite_widget,{})
    local templates = awmtk2.create_template_lib("supermenu",awmtk2.templates,{})
    local t = awmtk2.build_templates(templates,style,args.vertical)
    local wallpaper
    if gears.filesystem.file_readable(root_path.."/wallpaper.txt") then
        local wallpaper_f = io.open(root_path.."/wallpaper.txt","r")
        wallpaper = wallpaper_f:read("*a")
        wallpaper_f:close()
    end
    supermenu = awful.popup(t.popup({
        {
            {
                widget = wibox.container.background
            },
            {
                layout = wibox.layout.flex.vertical,
                id = "contents"
            },
            {
                t.container({
                    id = "buttonlist",
                    layout = wibox.layout.fixed.vertical
                },{
                    bg = style.container.bg_highlight
                }),
                valign = "center",
                halign = "right",
                fill_vertical = true,
                fill_horizontal = false,
                widget = wibox.container.place
            },
            layout = wibox.layout.align.horizontal
        },
        widget = wibox.container.background,
        forced_width = args.screen.workarea.width-style.popup.margins,
        forced_height = args.screen.workarea.height-style.popup.margins,
        id = "supermenu_root"
    },{
        x = args.screen.workarea.x,
        y = args.screen.workarea.y,
        visible = false
    }))
    local supermenu_root = supermenu.widget:get_children_by_id("supermenu_root")[1]
    if style.popup.transparent then
        if not awesome.composite_manager_running then
            -- Really slow but the effect is ok
            supermenu_root.bgimage = bgimagegen(try_blur(wallpaper or beautiful.wallpaper,
                function(path)
                    supermenu_root.bgimage = bgimagegen(path)
                end))
        else
            -- Let the compositor handle transparency
            supermenu_root.bg = style.popup.bg_normal.."66"
            supermenu.widget.bg = "#00000000"
        end
    end
    args.screen:connect_signal("property::workarea",function()
        supermenu.x = args.screen.workarea.x
        supermenu.y = args.screen.workarea.y
        supermenu_root.forced_width = args.screen.workarea.width-style.popup.margins*2
        supermenu_root.forced_height = args.screen.workarea.height-style.popup.margins*2
    end)
    supermenu:connect_signal("button::press",function(self,x,y,button)
        if button == 3 then
            supermenu.visible = false
        end
    end)
    local tabsfile = io.open(root_path.."/themes/"..global.theme..'/config/supermenu.json',"r")
    local contents = supermenu.widget:get_children_by_id("contents")[1]
    local buttonlist = supermenu.widget:get_children_by_id("buttonlist")[1]
    local tabs = {}
    local tab_icons = {}
    local function gen_buttons(tab_id,icon)
        local button = wibox.widget({
            image = icon,
            resize = true,
            widget = wibox.widget.imagebox,
            forced_width = style.icon.width,
            forced_height = style.icon.height
        })
        button:connect_signal("button::press",function()
            contents:set(1,tabs[tab_id])
        end)
        return button
    end
    if tabsfile then
        for k,v in pairs(json.decode(tabsfile:read("*a"))) do
            local widget,icon = require(k)(v)
            print(widget,icon)
            table.insert(tab_icons,icon or beautiful.icon_default)
            table.insert(tabs,widget)
        end
    end
    if tabs[1] then
        contents:add(tabs[1])
    end
    for k,_ in pairs(tabs) do
        buttonlist:add(gen_buttons(k,tab_icons[k]))
    end
    root.keys(gears.table.join(
        root.keys(),
        ask.k(":supermenu.open",function()
            supermenu.visible = not supermenu.visible
        end,{
            description = "open supermenu",
            group = "widgets"
        })
    ))
    return supermenu
end
return function(args)
    for s in screen do
        s.lock = _preload(gears.table.join(args,{
            screen = s
        }))
    end
end