hist = {
	name = "history",
	version = "26",
	initialised = false,
	SV={},
	L={},
	me = {},
	playerName = "",	-- might change
	playerID = "",  	-- Unique through renames
	tz_offset =0,
	debug = false
}

local function log_truncate(max)
--Limit log to max
	for _ = max, (#hist.SV.log-1)  do
		table.remove(hist.SV.log,1)
		if hist.debug then
			d("Truncated log.  Size now:  " .. tostring(#hist.SV.log))
		end
	end
end


local function log(text)

	table.insert(hist.SV.log,{["TimeStamp"]=GetTimeStamp(),
							["text"] = text,
							["Char"] = hist.playerName,
							["CharID"] = hist.playerID,
							})
end

local function log_me(text)	-- per char log

	table.insert(hist.me.log,{["TimeStamp"]=GetTimeStamp(),
							["text"] = text,
							})
end

local Keep_Acheivement = function (cat) -- is this an acheivement we want to save?
	if cat == 8 or cat == 3 or cat == 5 then
		return false
	end
	return true
end

local function get_start ()	-- get better start date from Achievements
		-- Check Achievements
		local earliest_time = 0
		local earliest_Achievement
		for id, ach in pairs(hist.me.ach) do
			if earliest_time == 0 then
				earliest_time = ach.time
				earliest_Achievement = id
			elseif earliest_time > ach.time then
				earliest_time = ach.time
			end
		end

		if earliest_time == 0 then	-- No Achievements
			earliest_time = GetTimeStamp()
		end

		if hist.me.Created == nil	then
			hist.me.Created = earliest_time
		elseif hist.me.Created > earliest_time then		-- Quest was earlier, then reset to earlier
			if hist.debug then
					d("Start Time Reset for " .. hist.playerName)
			end
			log ("Start Time Reset.")
			hist.me.Created = earliest_time
		end
end

local function Achievement(_, name, points, id, link)
	local description
	local cat  = GetCategoryInfoFromAchievementId(id)
	local category_name =GetAchievementCategoryInfo(category_id)
		_,description,_,_,_,_,_= GetAchievementInfo(id)
	if Keep_Acheivement(cat)  then
	hist.me.ach[id]={
		["Category_ID"] = cat,
		["Category"] = category_name,
		["time"] = GetTimeStamp(),
		["points"] = points,
		["name"] = zo_strformat(name),
		["description"] = zo_strformat(description),
		["link"] = link
		}

      if hist.debug then
        d("Achievement Awarded:.. ")
        d(hist.me.ach[id])
      end
	end
end

local function  log_clear()
	hist.SV.log = {}
	log("Cleared")
end
function load_history()
-- load up historic Achievements
	log("Request to load historic Dungeon Achievements")
	local name,points,description,completed,adate,atime
  local cat
  local count = 0
	for i = 1,2000 do
		name,description,points,_,completed,adate,atime= GetAchievementInfo(i)
		if completed then
			cat,_,_ =GetCategoryInfoFromAchievementId(i)
			if Keep_Acheivement(cat)  then
				if hist.me.ach[i] == nil then
				--	log("Added historic achievement " ..i .. " " .. name)
						local category_id  = GetCategoryInfoFromAchievementId(i)
						local category_name =GetAchievementCategoryInfo(category_id)
						hist.me.ach[i]={
							["Category_ID"] = category_id,
							["Category"] = category_name,
							["time"] = (luatz_esodate(adate .. " " .. atime)+ hist.tz_offset),
							["points"] = points,
							["name"] = zo_strformat(name),
							["description"] = zo_strformat(description),
							["link"] = GetAchievementLink(i)
							}
						count = count + 1
				end
			end
		end
	end
	log("Added " .. tostring(count) .. " historic achievements.")
	d("reloaded achievements")
end

local function fix()  -- fix links etc for any old data
local description
	hist.me.ach_updates = nil
	log("Request to fix Achievement data")
 for i,_ in pairs(hist.me.ach) do
 		_, description,_,_,_,_,_= GetAchievementInfo(i)
		local category_id  = GetCategoryInfoFromAchievementId(i)
		local category_name =GetAchievementCategoryInfo(category_id)
		hist.me.ach[i]["Category_ID"] = category_id
		hist.me.ach[i]["Category"] = category_name
		hist.me.ach[i]["description"] = zo_strformat(description)
		hist.me.ach[i]["link"] = GetAchievementLink(i)
 end

end

local function new_map()
    local map = zo_strformat("<<C:1>>",GetMapName())
	if hist.me.maps[map] == nil then
		hist.me.maps[map] = {}
		hist.me.maps[map].firstvisitdate = GetTimeStamp()
		if hist.debug then
			d("New Map: " .. map )
		end
		log("New map: " .. map)
	end
	return map
end

local function Activated()
	hist.me.timeplayed_last = hist.me.timeplayed
	hist.me.timeplayed = math.floor(GetSecondsPlayed() /60)
	if hist.me.levels[hist.me.level] ~= nil then
		hist.me.levels[hist.me.level].time = hist.me.timeplayed
	end

	if hist.SV.CP_Level > 0 and hist.SV.CP[hist.SV.CP_Level] ~= nil then
		hist.SV.CP[hist.SV.CP_Level].time = hist.SV.CP[hist.SV.CP_Level].time + hist.me.timeplayed - hist.me.timeplayed_last
	end

	local map = new_map()
	if hist.me.maps[map].visit == nil then
		hist.me.maps[map].visit = 1
	else
		hist.me.maps[map].visit = hist.me.maps[map].visit +1
	end
end


local function levelup(_, unitTag,_)
	if unitTag ~= "player" then
		return
	end

	hist.me.base_level = GetUnitLevel("player")
	hist.me.veteran_level =  GetUnitVeteranRank("player")

		-- Duplication of info, but easier to work with
	local map = new_map()
	if hist.me.maps[map].timeslevel == nil then
		hist.me.maps[map].timeslevel = 1
		hist.me.maps[map].firstlevel = hist.me.level
	else
		hist.me.maps[map].timeslevel = hist.me.maps[map].timeslevel + 1
	end


	if hist.me.veteran_level > 0 then return end

	hist.me.level = hist.me.base_level

	log("Level up to " .. hist.me.level)
    hist.me.levels[hist.me.level] = {
        begin = GetTimeStamp(),
        time  = 0,		-- Accumulated time in Minutes
        Ach_Points = GetEarnedAchievementPoints(),
        deaths = 0
    }

	--Update Level data with map
	if hist.me.levels[hist.me.level].map == nil then
		hist.me.levels[hist.me.level].map = map

		local msg = "First Levelup in map " .. map
		log (msg)
		if hist.debug then
			d(msg)
		end
	end
end


local function CP_Levelup(_,unitTag, old, new)
	if unitTag ~= "player" then
		return
	end

	hist.SV.CP_Level=tonumber(new)	-- unclear of type, coerce
	log("CP Gained was " .. old .. ",  now " .. new)

	hist.SV.CP[hist.SV.CP_Level] = {}
	hist.SV.CP[hist.SV.CP_Level].begin= GetTimeStamp()
	hist.SV.CP[hist.SV.CP_Level].playerID = hist.playerID
	hist.SV.CP[hist.SV.CP_Level].map = map
	hist.SV.CP[hist.SV.CP_Level].deaths =0
	hist.SV.CP[hist.SV.CP_Level].time=0

	hist.me.base_level = GetUnitLevel("player")
	hist.me.veteran_level =  GetUnitVeteranRank("player")
	hist.me.level = hist.me.base_level + hist.me.veteran_level

	if hist.debug then
	end
	log("CP_Level up to " .. new)

end

local function CP_Achieved(_,_)
	log("Achieved Champion Rank.")
end

local function gendertext()
	if (GetUnitGender("player") == GENDER_MALE)
	then return "M"
	end

	if (GetUnitGender("player") == GENDER_FEMALE)
	then return "F"
	end

	return "U"
end
local function setup_char()
		log("Set up: " .. hist.playerName )
		hist.SV.data[hist.playerID] = {}		-- initialise data for current char, using unique GUID
		hist.me = hist.SV.data[hist.playerID]
		hist.me.name=hist.playerName

		hist.me.Class = zo_strformat("<<C:1>>",GetUnitClass("player"))
		hist.me.Race = zo_strformat("<<C:1>>",GetUnitRace("player"))
		hist.me.Gender = gendertext()
		hist.me.base_level = GetUnitLevel("player")
		hist.me.veteran_level =  GetUnitVeteranRank("player")
		hist.me.level = hist.me.base_level + hist.me.veteran_level
		hist.me.Alliance = zo_strformat("<<C:1>>",GetAllianceName(GetUnitAlliance("player")))
		hist.me.ach={}
		hist.me.maps={}
		hist.me.log={}

		hist.me.levels = {}
		hist.me.levels[hist.me.level] = {
			begin = GetTimeStamp(),
			time  = 0,		-- Accumulated time in Minutes
			Ach_Points = GetEarnedAchievementPoints(),
			deaths = 0

		}  -- end of defaults
		hist.me["LoadTime"] = GetTimeStamp()
		load_history()
		get_start()
		log_me("Started")
end

local function Dead()
	-- Per Level
	if hist.me.levels[hist.me.base_level] == nil then
		log("err: dead at " .. hist.me.base_level)
		return
	end
	hist.me.levels[hist.me.base_level].deaths = hist.me.levels[hist.me.base_level].deaths +1
	-- Per Map

	local map = new_map()

	--Update map data with Deaths
	if hist.me.maps[map].deaths == nil then
		hist.me.maps[map].deaths = 0
		hist.me.maps[map].firstdeathlevel = hist.me.level
		local msg = "First Death in map " .. map
		log (msg)
		if hist.debug then
		d("First Death in map " ..map)
		end
	end
	hist.me.maps[map].deaths = hist.me.maps[map].deaths +1

	if hist.me.maps[map].firstdeathdate == nil then
		hist.me.maps[map].firstdeathdate  = GetTimeStamp()
	end

	if hist.SV.CP[hist.SV.CP_Level] ~= nil then
		hist.SV.CP[hist.SV.CP_Level].deaths = hist.SV.CP[hist.SV.CP_Level].deaths +1
	end

end

del_old_categories = function()
	log("Unwanted Category information Purged for all chars.")
	for playerID, player in pairs (hist.SV.data)  do
		for ID, ach in pairs  (player.ach) do
			if Keep_Acheivement (ach["Category_ID"]) then
				player.ach[ID] = nil
			end
		end
	end
end

function hist.Initialise(_, addOnName)
	if (hist.name ~= addOnName) then return end

	-- find computed time difference.
	local now = GetTimeStamp()
	hist.datestr = GetDateStringFromTimestamp(now)
	hist.timestr = GetTimeString()
	hist.luatz_ts = luatz_esodate(hist.datestr .." " .. hist.timestr)
	hist.tz_offset = now - hist.luatz_ts

	hist.playerName = GetUnitName("player")
	hist.playerID = GetCurrentCharacterId()

    -- Load the saved variables
    hist.SV = ZO_SavedVars:NewAccountWide("History_SV", 1, nil, nil)

	--remove old acheivement categories

	if hist.SV.catcleaned == nil then
		del_old_categories()
		hist.SV.catcleaned = 1
	end

	if hist.SV.log == nil then
		hist.SV.log = {}
		log("hist.SV.log created")
	end

	if hist.SV.CP == nil then
		hist.SV.CP = {}
	end

	if hist.SV.CP_Level == nil then
		hist.SV.CP_Level = 0
	end


	if (hist.SV.data == nil ) then
		hist.SV.data = {}
		log("hist.SV.data  created")
	end
	if (hist.SV.old ~= nil) then -- Delete legacy data that we never used anyway
		hist.SV.old = nil
	end

	if (hist.SV.start_version  == nil ) then
		hist.SV.start_version = hist.version
	end

	hist.SV.this_version = hist.version

 --- hist.SV.version    -- Used by ZOS System

	if hist.SV.data[hist.playerID] == nil then
		if debug then
			log("No data found for PlayerID")
		end
	-- Ok playerID may be nil, but we might still have data under player name
	-- In which case we rename it, otherwise it is a new char.

		if hist.SV.data[hist.playerName] == nil then
			--No name, no ID, must be new.
			setup_char()
		else
			-- Ok old name data, fix it.
			log("New data format, saving " .. hist.playerName .. " as " ..  hist.playerID)
			hist.SV.data[hist.playerID] = hist.SV.data[hist.playerName]
			hist.SV.data[hist.playerID].name = hist.playerName

			hist.SV.data[hist.playerName] = nil		-- and on the eighth day God invented Lua
		end
	end

	hist.me = hist.SV.data[hist.playerID]

	hist.me.CP = nil
	hist.me.craft = nil

	hist.me.base_level = GetUnitLevel("player")
	hist.me.veteran_level =  GetUnitVeteranRank("player")
	hist.me.level = hist.me.base_level + hist.me.veteran_level

	hist.SV.CP_Level = GetPlayerChampionPointsEarned()


	if 	hist.me.levels == nil then
		hist.me.levels = {}
	end

	if hist.me.maps == nil then
		hist.me.maps = {}
	end

	if hist.me.log == nil then	-- special events we want to keep, like name changes
		hist.me.log = {}
	end


	if hist.debug then
		log_truncate(500)
	else
		log_truncate(20)
	end

	hist.SV.lang=GetCVar("language.2")	-- For offline use

	if hist.me.logins == nil then
		hist.me.logins = 0
	end
	hist.me.logins = hist.me.logins +1		-- count them.

	hist.me["LoginTime"] = GetTimeStamp()

	if hist.me["ReloadTime"] == nil then
		hist.me["ReloadTime"] = GetTimeStamp()
	end

	if  hist.me["ReloadTime"] + 80080 <= GetTimeStamp() then	 --  23 hours or more have past
		load_history()		-- pickup anything that might be missed
		hist.me["ReloadTime"] = GetTimeStamp()
		log ("Startup: Timed check on missed achievements.")
	end

	if hist.me.name ~= hist.playerName then
		log("Changed Name, Was " ..  hist.me.name)
		log_me("Changed Name, Was " ..  hist.me.name)
		hist.me.name = hist.playerName
	end

	if 	hist.me.Race ~= zo_strformat("<<C:1>>",GetUnitRace("player")) then
		log("Changed Race, Was " .. hist.me.Race)
		log_me("Changed Race, Was " .. hist.me.Race)
		hist.me.Race = zo_strformat("<<C:1>>",GetUnitRace("player"))
	end

	if 	hist.me.Gender ~= gendertext() then
		log("Changed Gender, Was " .. hist.me.Gender)
		log_me("Changed Gender, Was " .. hist.me.Gender)
		hist.me.Gender = gendertext()
	end

	--[[
	--  remove levels without maps- these are probably CP and dud anyway.
	local dud = 0
	for key,L in pairs (hist.me.levels) do
		if L.map == nil then
			dud = dud +1
			hist.me.levels[key] = nil
		else

			if key > 66 then	-- is CP move to accountwide if not already there
				local cpkey = key-50	-- max level now set to 50, so everything beyon
				if hist.SV.CP[cpkey] == nil then
					hist.SV.CP[cpkey] = {}
					hist.SV.CP[cpkey].begin = L.begin
					hist.SV.CP[cpkey].map = L.map
					hist.SV.CP[cpkey].deaths = L.deaths
					hist.SV.CP[cpkey].playerID = hist.playerID
					hist.SV.CP[cpkey].time = L.time
					log(cpkey  .. " moved to CP")
					hist.me.levels[key] = nil		-- and delete old
				else
					log(key  .. " not moved to CP")
				end
			end
		end
	end
	--]]

	--[[
    hist.me.levels[hist.me.level] = {
        begin = GetTimeStamp(),
        time  = 0,		-- Accumulated time in Minutes
        Ach_Points = GetEarnedAchievementPoints(),
        deaths = 0
    }

			hist.SV.CP[new].begin= GetTimeStamp()
		hist.SV.CP[new].playerID = hist.playerID
		hist.SV.CP[new].map = map
		hist.SV.CP[new].deaths =0
		hist.SV.CP[new].time=0

	--]]
	EVENT_MANAGER:RegisterForEvent(hist.name, EVENT_ACHIEVEMENT_AWARDED, Achievement)
	EVENT_MANAGER:RegisterForEvent(hist.name, EVENT_LEVEL_UPDATE, levelup)
	EVENT_MANAGER:RegisterForEvent(hist.name, EVENT_CHAMPION_POINT_UPDATE, CP_Levelup)
	EVENT_MANAGER:RegisterForEvent(hist.name, EVENT_CHAMPION_LEVEL_ACHIEVED , CP_Achieved)
	EVENT_MANAGER:RegisterForEvent(hist.name, EVENT_VETERAN_RANK_UPDATE, levelup)
	EVENT_MANAGER:RegisterForEvent(hist.name, EVENT_PLAYER_ACTIVATED, Activated)
--	EVENT_MANAGER:RegisterForEvent(hist.name, EVENT_PLAYER_DEACTIVATED, Activated)
	EVENT_MANAGER:RegisterForEvent(hist.name, EVENT_PLAYER_DEAD, Dead)
	EVENT_MANAGER:RegisterForEvent(hist.name, EVEN_ZONE_CHANGED, new_map)
	hist.initialised = true
end



SLASH_COMMANDS["/histload"] = load_history
SLASH_COMMANDS["/histfix"] = fix
SLASH_COMMANDS["/histclear"] = log_clear
SLASH_COMMANDS["/histstart"] = get_start

EVENT_MANAGER:RegisterForEvent(hist.name, EVENT_ADD_ON_LOADED, hist.Initialise)