--[[
    Debug Overlay module
    @author : Eiyeron Fulmincendii

    The debug overlay is targeting to be a relatively agnositc debug framework for Love2D based on love-imgui.
    Requiring for now a custom class implementation and love-imgui.
    To turn on the debug module, set the global variable ENABLE_DEBUG_OVERLAY to true before requiring the debug module for the first time.
    It is very suggested to use imgui-love module as this module has been designed with it in mind.


    Modulable, th overlay create a menubar on the top of the game screen containing the different debug menus registered to
    the system. One being already registered containing
        - FPS and CPU/MEM usage graphs
        - an interactive console à-la Quake
        - a variable watch.

    Usage
    -----

    Create an instance like this:
        debug_overlay = require("debug_overlay"):new()

    In love.draw, before imgui.Render(), call your instance's render function:
        function love.draw()
            <snip>
            debug_overlay:render()
            imgui.Render();
        end

    To register a new window, create a class derived from DebugWindow (check debugwindow.lua and debug_overlay/graphs/init.lua for an example)
        local MyDebugWindow = class(DebugWindow)
    Note : to add a shortcut to the window in the menubar, add this line in your window's init function:
    function MyDebugWindow:init()
        <snip>
        self.shortcut = "f4"
        <snip>
    end

    And to register your debug windows in a menu:
        debug_overlay:register_menu("Menu button name", {WindowName=MyDebugWindow_Instance})
    (I use somemthing like this : )
        debug_overlay:register_menu("Menu button name", require("mydebugwindow"):new())

]]--
-- If not debug then returning a blank class.
if not _G.ENABLE_DEBUG_OVERLAY then
    local void = {}
    local mt = {
        __index = function(self, key) return self end,
        __newindex = function(self, key) return self end,
        __metatable = {},
        __call = function() return void end
        }
    setmetatable(void, mt)
    return void
end

require("imgui")
local class, object =  require("class"), require("class.object")
local Console = require("debug_overlay.console")
local Graphs = require("debug_overlay.graphs")
local Watch = require("debug_overlay.watch")


local Debug = class(object)

function Debug:init()
    self.debug_menus = {
        Debug = {
            Console = Console:new(),
            Watch = Watch:new(),
            Graphs = Graphs:new(),
        }
    }
    self.console = self.debug_menus.Debug.Console
    self.watch = self.debug_menus.Debug.Watch

end

function Debug:register_menu(menu_name, windows)
    if self.debug_menus[menu_name] then
        self.console:error('Debug : '..menu_name.." debug menu is already registered.")
        return
    end
    self.debug_menus[menu_name] = windows
end

function Debug:render()
    self.debug_menus.Debug.Graphs:update()
    if imgui.BeginMainMenuBar() then
        for menu,windows in pairs(self.debug_menus) do
        -- Menu
            if imgui.BeginMenu(menu) then
                for k,v in pairs(windows) do
                    if imgui.MenuItem(k, v.shortcut, v.visible) then
                        v:toggle()
                    end
                end
                imgui.EndMenu()
            end
        end
        imgui.EndMainMenuBar()
        for menu,windows in pairs(self.debug_menus) do
            for k, window in pairs(windows) do
                if window.visible then
                    window:render()
                end
            end
        end
    end
end

function Debug:keypressed(key)
    for _, windows in pairs(self.debug_menus) do
        for __, window in pairs(windows) do
            if window.shortcut and key == window.shortcut then
                window:toggle()
            end
        end
    end
end

return Debug