--[[
	* Copyright (c) 2011-2013 by Adam Hellberg.
	*
	* This file is part of KillTrack.
	*
	* KillTrack is free software: you can redistribute it and/or modify
	* it under the terms of the GNU General Public License as published by
	* the Free Software Foundation, either version 3 of the License, or
	* (at your option) any later version.
	*
	* KillTrack is distributed in the hope that it will be useful,
	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
	* GNU General Public License for more details.
	*
	* You should have received a copy of the GNU General Public License
	* along with KillTrack. If not, see <http://www.gnu.org/licenses/>.
--]]

KillTrack.Timer = {
	Time = {
		Start = 0,
		Stop = 0
	},
	Running = false,
	State = {
		START = 0,
		UPDATE = 1,
		STOP = 2
	}
}

local KT = KillTrack
local T = KT.Timer

local KTT = KillTrack_Tools

local TimerData = {}

local function FormatTime(s)
	local h = floor(s/60/60)
	local m = floor(s/60) - h * 60
	s = s - h * 60 ^ 2 - m * 60
	return ("%02.0f:%02.0f:%02.0f"):format(h, m, s)
end

T.Frame = CreateFrame("Frame")

local function TimeCheck(_, _)
	if not T.Running then T.Frame:SetScript("OnUpdate", nil) return end
	local now = time()
	TimerData.Last = now
	TimerData.Current = now - T.Time.Start
	TimerData.Start = T.Time.Start
	TimerData.Stop = T.Time.Stop
	TimerData.Total = TimerData.Stop - TimerData.Start
	TimerData.Left = TimerData.Total - TimerData.Current
	TimerData.LeftFormat = KTT:FormatSeconds(TimerData.Left)
	TimerData.Progress = TimerData.Current / TimerData.Total
	T:RunCallback(T:GetAllData(), T.State.UPDATE)
	if now >= T.Time.Stop then T:Stop() end
end

function T:GetAllData()
	return KTT:TableCopy(TimerData)
end

function T:GetData(key, failsafe)
	local r
	if failsafe then r = 0 end
	if not TimerData.__DATA__ then if failsafe then return 0 else return nil end end
	return TimerData.__DATA__[key] or r
end

function T:SetData(key, value)
	if type(TimerData.__DATA__) ~= "table" then TimerData.__DATA__ = {} end
	TimerData.__DATA__[key] = value
end

function T:IsRunning()
	return self.Running
end

function T:Start(seconds, minutes, hours, callback, data)
	if self.Running then return end
	self.Running = true
	self:Reset()
	seconds = tonumber(seconds) or 0
	minutes = tonumber(minutes) or 0
	hours = tonumber(hours) or 0
	seconds = seconds + minutes * 60 + hours * 60 ^ 2
	if seconds <= 0 then
		self.Running = false
		KT:Msg("Time must be greater than zero.")
		return false
	end
	if type(callback) == "function" then
		self:SetCallback(callback)
	end
	if type(data) == "table" then
		for k,v in pairs(data) do
			self:SetData(k, v)
		end
	end
	self.Time.Start = time()
	self.Time.Stop = self.Time.Start + seconds
	self:RunCallback(self:GetAllData(), self.State.START)
	self.Frame:SetScript("OnUpdate", TimeCheck)
	return true
end

function T:Stop()
	if not self.Running then return end
	self.Frame:SetScript("OnUpdate", nil)
	self:RunCallback(self:GetAllData(), self.State.STOP)
	self.Running = false
	self.Time.Diff = self.Time.Stop - self.Time.Start
	return self.Time.Diff
end

function T:Reset()
	wipe(TimerData)
	self.Time.Start = 0
	self.Time.Stop = 0
end

function T:GetCallback()
	return self.Callback
end

function T:SetCallback(func)
	if type(func) ~= "function" then error("Argument 'func' must be of type 'function'.") end
	self.Callback = func
end

function T:RunCallback(data, state)
	if type(data) ~= "table" then error("Argument 'data' must be of type 'table'.") end
	local callback = self:GetCallback()
	if callback then callback(data, state) end
end