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

require "imgui"

local Watcher = class(DebugWindow)

function Watcher:init( )
    self.watched_values = {}
    self.shortcut = "f10"
end

function Watcher:add(obj, member, name)
    self.watched_values[#self.watched_values + 1] = setmetatable({
        obj = obj,
        member = member,
        name = name or member
    }, {__mode = 'v'})
end

function Watcher:render()
    imgui.Begin("Watch")
    if #self.watched_values > 0 then
        imgui.Columns(2)
        for k,v in ipairs(self.watched_values) do
            if v.obj and v.member then
                local status,res = pcall(function() return tostring(v.obj[v.member]) end)
                if status then
                    imgui.TextUnformatted(v.name)
                    imgui.NextColumn()
                    imgui.TextUnformatted(res)
                    imgui.NextColumn()
                else
                    debug_overlay.console:error("Watcher: "..v.name.. " couldn't be read. ")
                    debug_overlay.console:debug(res)
                    table.remove(self.watched_values, k)
                end


            elseif v.obj == nil then
                imgui.TextUnformatted(v.name .. " <<Miss. obj.>>")
                imgui.NextColumn()
                imgui.NextColumn()
            else
                imgui.TextUnformatted(v.name .. " <<Miss. mem.>>")
                imgui.NextColumn()
                imgui.NextColumn()

            end
        end
    end
    imgui.End()
end

return Watcher