local GetTime = QuestHelper_GetTime

QuestHelper_File["manager_event.lua"] = "4.0.1.$svnversion$"
QuestHelper_Loadtime["manager_event.lua"] = GetTime()

-- zorba why does this file exist, are you a terrible person? you are a terrible person aren't you
-- yep, I'm a terrible person

-- File exists to centralize all the event hooks in one place. QH should never (rarely) eat CPU without going through this file. As a nice side effect, I can use this to measure when QH is using CPU. yaaaaay

local next_started = false

local time_used = 0

local EventRegistrar = {}

local OnUpdate_Keyed = {}

local qh_event_frame = CreateFrame("Frame")



function QH_Hook_NotMyFault(func, ...)
  return func(...)
end

local function wraptime(ident, func, ...)
  if QuestHelper then QuestHelper: Assert(ident) end
  local st, qhh_nmf
  local qhh_adj = 0
  if qh_loud_and_annoying then
    qhh_nmf = QH_Hook_NotMyFault
    --[[
      Function nesting == OMFG NO!
      What seems to be happening here is that we are setting QH_HOOK_NotMyFault
      to be an anonymous function, which returns the result of an internal
      anonymous function, which takes the result of func as its argument, does
      some work with the outer function's variables and spits its arguments
      back out unmodified.
    
      The fix so far...
      We can set a variable to represent the result of func, do our data
      manipulation and then return the contents of the temp variable.
      SO MUCH PRETTIER! AND EASIER TO READ TO BOOT!
    --]]
    QH_Hook_NotMyFault = function(func, ...)
      local zst = GetTime()
      local ret = {func(...)}
      qhh_adj = qhh_adj + (GetTime() - zst)
      return unpack(ret)
      --print("a", GetTime())
      --[[
      return (function(...)
        --print("c", GetTime(), GetTime() - zst, qhh_adj)
        qhh_adj = qhh_adj + (GetTime() - zst)
        --print(qhh_adj)
        return ...
      end)(func(...))
      --]]
    end
    st = GetTime()
  end
  func(...)
  if qh_loud_and_annoying then
    if GetTime() - st - qhh_adj > 0.0025 then
      QuestHelper: TextOut(string.format("Took way too long, %4f, at %s (adjusted by %4f)", (GetTime() - st - qhh_adj) * 1000, ident, qhh_adj * 1000))
    end
    QH_Hook_NotMyFault = qhh_nmf
  end
end

local function OnEvent(_, event, ...)
  if not next_started then next_started, time_used = true, 0 end
  
  if not qh_hackery_eventless and EventRegistrar[event] then 
    local tstart = GetTime()
    for _, v in pairs(EventRegistrar[event]) do
      wraptime(v.id, v.func, ...)
    end
    time_used = time_used + (GetTime() - tstart)
  end
end

qh_event_frame:UnregisterAllEvents()
qh_event_frame:RegisterAllEvents() -- I wonder what the performance penalty of this actually is
qh_event_frame:SetScript("OnEvent", OnEvent)

function QH_Event(event, func, identifier)
  QuestHelper: Assert(func)
  if type(event) == "table" then
    for _, v in ipairs(event) do
      QH_Event(v, func, identifier)
    end
  else
    if not identifier then identifier = "(unknown event " .. event .. ")" end
    if not EventRegistrar[event] then
      --qh_event_frame:RegisterEvent(event)
      EventRegistrar[event] = {}
    end
    table.insert(EventRegistrar[event], {func = func, id = identifier})
  end
end

local tls = GetTime()

-- I'm just putting this here so I can stop rewriting it

--[[
Try "/script qh_hackery_no_work = true". See if that fixes things.

Whether it does or not, log out, log back in, then do "/qh hackery_event_timing = true". Wait a few seconds, then take a screenshot. Post that here.
]]

local last_frame = GetTime()
local time_per_frame = 0.01 -- Assume 100fps so we don't fuck with people's framerate

local OnUpdate = {}
local OnUpdateHigh = {}
local function OnUpdateTrigger(_, ...)
  if not QuestHelper then return end
  
  if not next_started then next_started, time_used = true, 0 end
  
  do
    local tstart = GetTime()
    for _, v in pairs(OnUpdateHigh) do
      wraptime(v.id, v.func, ...)
    end
    
    for _, v in pairs(OnUpdate) do
      if v.func then wraptime(v.id, v.func, ...) end
    end
    time_used = time_used + (GetTime() - tstart)
  end
  
  local tframe = GetTime()
  local tplf = tframe - last_frame
  tplf = math.min(time_per_frame + 0.1, tplf)
  local tplf_weight = tplf * 20
  time_per_frame = (time_per_frame * (1 / (tplf_weight + 0.0005)) + tplf) / (1 + 1 / (tplf_weight + 0.0005))
  
  QuestHelper: Assert(time_per_frame > 0 and time_per_frame < 10000)  -- hmmm
  
  local verbose = false
  if qh_hackery_event_timing and tls < GetTime() - 1 then
    tls = GetTime()
    print(string.format("Avg TPF %f, current TPLF %f, time_used %f, this adjustment %f, bonus time %f", time_per_frame, tplf, time_used, time_per_frame - tplf - time_used, math.min(time_per_frame - tplf, (time_per_frame - tplf) * 0.8, 0.05)))
    verbose = true
  end
  if not qh_hackery_no_work then
    QH_Timeslice_Work(time_used, time_per_frame, math.min(time_per_frame - tplf, (time_per_frame - tplf) * 0.8, 0.05), verbose)
  end
  last_frame = GetTime()
  
  next_started = false
end

function QH_OnUpdate(func, identifier)
  if not identifier then identifier = "(unknown onupdate)" end
  table.insert(OnUpdate, {func = func, id = identifier})
end

function QH_OnUpdate_High(func, identifier)
  if not identifier then identifier = "(unknown high-onupdate)" end
  table.insert(OnUpdateHigh, {func = func, id = identifier})
end

qh_event_frame:SetScript("OnUpdate", OnUpdateTrigger)


function QH_Hook(target, hookname, func, identifier)
  if not identifier then identifier = string.format("(unknown hook %s/%s)", hookname, tostring(target)) end
  if hookname == "OnUpdate" then
    if not func then
      OnUpdate[target] = nil
    else
      OnUpdate[target] = {func = function (...) func(target, ...) end, id = identifier}
    end
  else
    if not func then
      target:SetScript(hookname, nil)
    else
      target:SetScript(hookname, function (...) wraptime(identifier, func, ...) end)
    end
  end
end