---@class TimerPrivateProps
---@field initialTime number the initial duration of the timer.
---@field onEnd? fun() cb function triggered when the timer finishes
---@field async? boolean wether the timer should run asynchronously or not
---@field startTime number the gametimer stamp of when the timer starts. changes when paused and played
---@field triggerOnEnd boolean set in the forceEnd method using the optional param. wether or not the onEnd function is triggered when force ending the timer early
---@field currentTimeLeft number current timer length
---@field paused boolean the pause state of the timer

---@class OxTimer : OxClass
---@field private private TimerPrivateProps
---@field start fun(self: self, async?: boolean) starts the timer
---@field forceEnd fun(self: self, triggerOnEnd: boolean) end timer early and optionally trigger the onEnd function still
---@field isPaused fun(self: self): boolean returns wether the timer is paused or not
---@field pause fun(self: self) pauses the timer until play method is called
---@field play fun(self: self) resumes the timer if paused
---@field getTimeLeft fun(self: self, format?: 'ms' | 's' | 'm' | 'h'): number | table returns the time left on the timer with the specified format rounded to 2 decimal places (miliseconds, seconds, minutes, hours). returns a table of all if not specified.
local timer = lib.class('OxTimer')

---@private
---@param time number
---@param onEnd fun(self: OxTimer)
---@param async? boolean
function timer:constructor(time, onEnd, async)
    assert(type(time) == "number" and time > 0, "Time must be a positive number")
    assert(onEnd == nil or type(onEnd) == "function", "onEnd must be a function or nil")
    assert(type(async) == "boolean" or async == nil, "async must be a boolean or nil")

    self.private.initialTime = time
    self.private.currentTimeLeft = time
    self.private.startTime = 0
    self.private.paused = false
    self.private.onEnd = onEnd
    self.private.triggerOnEnd = true

    self:start(async)
end

function timer:start(async)
    if self.private.startTime > 0 then return end

    self.private.startTime = GetGameTimer()

    local function tick()
        while self:getTimeLeft('ms') > 0 do
            while self:isPaused() do
                Wait(0)
            end
            Wait(0)
        end
        self:onEnd()
    end

    if async then
        Citizen.CreateThreadNow(function()
            tick()
        end)
    else
        tick()
    end
end

function timer:onEnd()
    if self:getTimeLeft('ms') > 0 then return end

    if self.private.triggerOnEnd and self.private.onEnd then
        self.private:onEnd()
    end
end

function timer:forceEnd(triggerOnEnd)
    if self:getTimeLeft('ms') <= 0 then return end
    self.private.triggerOnEnd = triggerOnEnd
    self.private.paused = false
    self.private.currentTimeLeft = 0
    Wait(0)
end

function timer:pause()
    if self.private.paused then return end
    self.private.currentTimeLeft = self:getTimeLeft('ms') --[[@as number]]
    self.private.paused = true
end

function timer:play()
    if not self.private.paused then return end
    self.private.startTime = GetGameTimer()
    self.private.paused = false
end

function timer:isPaused()
    return self.private.paused
end

function timer:restart(async)
    self:forceEnd(false)
    Wait(0)
    self.private.currentTimeLeft = self.private.initialTime
    self.private.startTime = 0
    self:start(async)
end

function timer:getTimeLeft(format)
    local ms = self.private.currentTimeLeft - (GetGameTimer() - self.private.startTime)

    local roundedfloat = function(value)
        return tonumber(string.format('%.2f', value))
    end

    if format == 'ms' then
        return roundedfloat(ms)
    end

    local s = ms / 1000

    if format == 's' then
        return roundedfloat(s)
    end

    local m = s / 60

    if format == 'm' then
        return roundedfloat(m)
    end

    local h = m / 60

    if format == 'h' then
        return roundedfloat(h)
    end

    return {
        ms = roundedfloat(ms),
        s = roundedfloat(s),
        m = roundedfloat(m),
        h = roundedfloat(h)
    }
end

---@param time number
---@param onEnd fun(self: OxTimer)
---@param async? boolean
function lib.timer(time, onEnd, async)
    return timer:new(time, onEnd, async)
end

return lib.timer