--[[
    Debug resource graph class
    @author : Eiyeron Fulmincendii

    A Flixel-like graph class to show some graphs related to CPU and Memory usage.
]]--

require("imgui")
local class =  require("class")
local DebugWindow = require("debug_overlay.debugwindow")

local Graphs = class(DebugWindow)

local function shift_push_array(arr, new)
    for i=1,#arr-1 do
        arr[i] = arr[i+1]
    end
    arr[#arr] = new
end

function Graphs:init()
    self.shortcut = "f11"
    self.fps = {}
    self.cpu = {}
    self.mem = {}
    self.mem_avg = 0
    for i=1,60 do self.fps[i], self.cpu[i], self.mem[i] = 0,0,0 end
end

function Graphs:update_avg()
    local sum = 0
    for k,v in ipairs(self.mem) do
        sum = sum + v
    end
    self.mem_avg = sum / #self.mem
end

function Graphs:update()
    shift_push_array(self.fps, love.timer.getFPS())
    shift_push_array(self.cpu, love.timer.getDelta())
    shift_push_array(self.mem, collectgarbage("count"))
    self:update_avg()
end

function Graphs:render()
    imgui.Begin("Performance")
    imgui.PlotLines("CPU", self.cpu, #self.cpu, 0, "", 0, 15)
    imgui.PlotLines("FPS", self.fps, #self.fps, 0, "", 0, 60)
    imgui.PlotLines("Mem", self.mem, #self.mem)
    imgui.TextUnformatted(string.format("Average DT %0.3f ms", love.timer.getAverageDelta()*1000))
    imgui.TextUnformatted(string.format("Memory %0.2f KB", self.mem_avg))
    imgui.End()
end

return Graphs