-- local Madwork = _G.Madwork
--[[
{Madwork}

-[ProfileService]---------------------------------------
	(STANDALONE VERSION)
	DataStore profiles - universal session-locked savable table API
	
	Official documentation:
		https://madstudioroblox.github.io/ProfileService/

	DevForum discussion:
		https://devforum.roblox.com/t/ProfileService/667805
	
	WARNINGS FOR "Profile.Data" VALUES:
	 	! Do not create numeric tables with gaps - attempting to replicate such tables will result in an error;
		! Do not create mixed tables (some values indexed by number and others by string key), as only
		     the data indexed by number will be replicated.
		! Do not index tables by anything other than numbers and strings.
		! Do not reference Roblox Instances
		! Do not reference userdata (Vector3, Color3, CFrame...) - Serialize userdata before referencing
		! Do not reference functions
		
	WARNING: Calling ProfileStore:LoadProfileAsync() with a "profile_key" which wasn't released in the SAME SESSION will result
		in an error! If you want to "ProfileStore:LoadProfileAsync()" instead of using the already loaded profile, :Release()
		the old Profile object.
		
	Members:
	
		ProfileService.ServiceLocked         [bool]
		
		ProfileService.IssueSignal           [ScriptSignal] (error_message, profile_store_name, profile_key)
		ProfileService.CorruptionSignal      [ScriptSignal] (profile_store_name, profile_key)
		ProfileService.CriticalStateSignal   [ScriptSignal] (is_critical_state)
	
	Functions:
	
		ProfileService.GetProfileStore(profile_store_index, profile_template) --> [ProfileStore]
			profile_store_index   [string] -- DataStore name
			OR
			profile_store_index   [table]: -- Allows the developer to define more GlobalDataStore variables
				{
					Name = "StoreName", -- [string] -- DataStore name
					-- Optional arguments:
					Scope = "StoreScope", -- [string] -- DataStore scope
				}
			profile_template      [table] -- Profiles will default to given table (hard-copy) when no data was saved previously
				
	Members [ProfileStore]:
	
		ProfileStore.Mock   [ProfileStore] -- Reflection of ProfileStore methods, but the methods will use a mock DataStore
		
	Methods [ProfileStore]:
	
		ProfileStore:LoadProfileAsync(profile_key, not_released_handler) --> [Profile / nil] not_released_handler(place_id, game_job_id)
		ProfileStore:GlobalUpdateProfileAsync(profile_key, update_handler) --> [GlobalUpdates / nil] (update_handler(GlobalUpdates))
			-- Returns GlobalUpdates object if update was successful, otherwise returns nil
		
		ProfileStore:ViewProfileAsync(profile_key) --> [Profile / nil] -- Notice #1: Profile object methods will not be available;
			Notice #2: Profile object members will be nil (Profile.Data = nil, Profile.MetaData = nil) if the profile hasn't
			been created, with the exception of Profile.GlobalUpdates which could be empty or populated by
			ProfileStore:GlobalUpdateProfileAsync()
			
		ProfileStore:WipeProfileAsync(profile_key) --> is_wipe_successful [bool] -- Completely wipes out profile data from the
			DataStore / mock DataStore with no way to recover it.
		
		* Parameter description for "ProfileStore:LoadProfileAsync()":
		
			profile_key            [string] -- DataStore key
			not_released_handler = "ForceLoad" -- Force loads profile on first call
			OR
			not_released_handler = "Steal" -- Steals the profile ignoring it's session lock
			OR
			not_released_handler   [function] (place_id, game_job_id) --> [string] ("Repeat" / "Cancel" / "ForceLoad")
				-- "not_released_handler" will be triggered in cases where the profile is not released by a session. This
				function may yield for as long as desirable and must return one of three string values:
					["Repeat"] - ProfileService will repeat the profile loading proccess and may trigger the release handler again
					["Cancel"] - ProfileStore:LoadProfileAsync() will immediately return nil
					["ForceLoad"] - ProfileService will repeat the profile loading call, but will return Profile object afterwards
						and release the profile for another session that has loaded the profile
					["Steal"] - The profile will usually be loaded immediately, ignoring an existing remote session lock and applying
						a session lock for this session.
						
		* Parameter description for "ProfileStore:GlobalUpdateProfileAsync()":
		
			profile_key      [string] -- DataStore key
			update_handler   [function] (GlobalUpdates) -- This function gains access to GlobalUpdates object methods
				(update_handler can't yield)
		
	Members [Profile]:
	
		Profile.Data            [table] -- Writable table that gets saved automatically and once the profile is released
		Profile.MetaData        [table] (Read-only) -- Information about this profile
		
			Profile.MetaData.ProfileCreateTime   [number] (Read-only) -- os.time() timestamp of profile creation
			Profile.MetaData.SessionLoadCount    [number] (Read-only) -- Amount of times the profile was loaded
			Profile.MetaData.ActiveSession       [table] (Read-only) {place_id, game_job_id} / nil -- Set to a session link if a
				game session is currently having this profile loaded; nil if released
			Profile.MetaData.MetaTags            [table] {["tag_name"] = tag_value, ...} -- Saved and auto-saved just like Profile.Data
			Profile.MetaData.MetaTagsLatest      [table] (Read-only) -- Latest version of MetaData.MetaTags that was definetly saved to DataStore
				(You can use Profile.MetaData.MetaTagsLatest for product purchase save confirmation, but create a system to clear old tags after
				they pile up)

		Profile.MetaTagsUpdated [ScriptSignal] (meta_tags_latest) -- Fires after every auto-save, after
			--	Profile.MetaData.MetaTagsLatest has been updated with the version that's guaranteed to be saved;
			--  .MetaTagsUpdated will fire regardless of whether .MetaTagsLatest changed after update;
			--	.MetaTagsUpdated may fire after the Profile is released - changes to Profile.Data are not saved
			--	after release.
		
		Profile.GlobalUpdates   [GlobalUpdates]
		
	Methods [Profile]:
	
		-- SAFE METHODS - Will not error after profile expires:
		Profile:IsActive() --> [bool] -- Returns true while the profile is active and can be written to
			
		Profile:GetMetaTag(tag_name) --> value
		
		Profile:Reconcile() -- Fills in missing (nil) [string_key] = [value] pairs to the Profile.Data structure
		
		Profile:ListenToRelease(listener) --> [ScriptConnection] (place_id / nil, game_job_id / nil) -- WARNING: Profiles can be released externally if another session
			force-loads this profile - use :ListenToRelease() to handle player leaving cleanup.
			
		Profile:Release() -- Call after the session has finished working with this profile
			e.g., after the player leaves (Profile object will become expired) (Does not yield)

		Profile:ListenToHopReady(listener) --> [ScriptConnection] () -- Passed listener will be executed after the releasing UpdateAsync call finishes;
			--	Wrap universe teleport requests with this method AFTER releasing the profile to improve session lock sharing between universe places;
			--  :ListenToHopReady() will usually call the listener in around a second, but may ocassionally take up to 7 seconds when a release happens
			--	next to an auto-update in regular usage scenarios.

		Profile:Identify() --> [string] -- Returns a string containing DataStore name, scope and key; Used for debug;
			-- Example return: "[Store:"GameData";Scope:"Live";Key:"Player_2312310"]"
		
		-- DANGEROUS METHODS - Will error if the profile is expired:
		-- MetaTags - Save and read values stored in Profile.MetaData for storing info about the
			profile itself like "Profile:SetMetaTag("FirstTimeLoad", true)"
		Profile:SetMetaTag(tag_name, value)
		
		Profile:Save() -- Call to quickly progress global update state or to speed up save validation processes (Does not yield)

		
	Methods [GlobalUpdates]:
	
	-- ALWAYS PUBLIC:
		GlobalUpdates:GetActiveUpdates() --> [table] {{update_id, update_data}, ...}
		GlobalUpdates:GetLockedUpdates() --> [table] {{update_id, update_data}, ...}
		
	-- ONLY WHEN FROM "Profile.GlobalUpdates":
		GlobalUpdates:ListenToNewActiveUpdate(listener) --> [ScriptConnection] listener(update_id, update_data)
		GlobalUpdates:ListenToNewLockedUpdate(listener) --> [ScriptConnection] listener(update_id, update_data)
		-- WARNING: GlobalUpdates:LockUpdate() and GlobalUpdates:ClearLockedUpdate() will error after profile expires
		GlobalUpdates:LockActiveUpdate(update_id)
		GlobalUpdates:ClearLockedUpdate(update_id)
		
	-- EXPOSED TO "update_handler" DURING ProfileStore:GlobalUpdateProfileAsync() CALL
		GlobalUpdates:AddActiveUpdate(update_data)
		GlobalUpdates:ChangeActiveUpdate(update_id, update_data)
		GlobalUpdates:ClearActiveUpdate(update_id)
		
--]]


local SETTINGS = {

	AutoSaveProfiles = 30, -- Seconds (This value may vary - ProfileService will split the auto save load evenly in the given time)
	RobloxWriteCooldown = 7, -- Seconds between successive DataStore calls for the same key
	ForceLoadMaxSteps = 8, -- Steps taken before ForceLoad request steals the active session for a profile
	AssumeDeadSessionLock = 30 * 60, -- (seconds) If a profile hasn't been updated for 30 minutes, assume the session lock is dead
		-- As of writing, os.time() is not completely reliable, so we can only assume session locks are dead after a significant amount of time.
	
	IssueCountForCriticalState = 5, -- Issues to collect to announce critical state
	IssueLast = 120, -- Seconds
	CriticalStateLast = 120, -- Seconds
	
	MetaTagsUpdatedValues = { -- Technical stuff - do not alter
		ProfileCreateTime = true,
		SessionLoadCount = true,
		ActiveSession = true,
		ForceLoadSession = true,
		LastUpdate = true,
	}
	
}

local Madwork -- Standalone Madwork reference for portable version of ProfileService
do

	local MadworkScriptSignal = {}
	
	local ScriptConnection = {}
	
	function ScriptConnection:Disconnect()
		local listener = self._listener
		if listener ~= nil then
			local script_signal = self._script_signal
			local fire_pointer_stack = script_signal._fire_pointer_stack
			local listeners_next = script_signal._listeners_next
			local listeners_back = script_signal._listeners_back
			-- Check fire pointers:
			for i = 1, script_signal._stack_count do
				if fire_pointer_stack[i] == listener then
					fire_pointer_stack[i] = listeners_next[listener]
				end
			end
			-- Remove listener:
			if script_signal._tail_listener == listener then
				local new_tail = listeners_back[listener]
				if new_tail ~= nil then
					listeners_next[new_tail] = nil
					listeners_back[listener] = nil
				else
					script_signal._head_listener = nil -- tail was also head
				end
				script_signal._tail_listener = new_tail
			elseif script_signal._head_listener == listener then
				-- If this listener is not the tail, assume another listener is the tail:
				local new_head = listeners_next[listener]
				listeners_back[new_head] = nil
				listeners_next[listener] = nil
				script_signal._head_listener = new_head
			else
				local next_listener = listeners_next[listener]
				local back_listener = listeners_back[listener]
				if next_listener ~= nil or back_listener ~= nil then -- Catch cases when duplicate listeners are disconnected
					listeners_next[back_listener] = next_listener
					listeners_back[next_listener] = back_listener
					listeners_next[listener] = nil
					listeners_back[listener] = nil
				end
			end
			self._listener = nil
			script_signal._listener_count -= 1
		end
		if self._disconnect_listener ~= nil then
			self._disconnect_listener(self._disconnect_param)
			self._disconnect_listener = nil
		end
	end
	
	local ScriptSignal = {}
	
	function ScriptSignal:Connect(listener, disconnect_listener, disconnect_param) --> [ScriptConnection]
		if type(listener) ~= "function" then
			error("[MadworkScriptSignal]: Only functions can be passed to ScriptSignal:Connect()")
		end
		local tail_listener = self._tail_listener
		if tail_listener == nil then
			self._head_listener = listener
			self._tail_listener = listener
			self._listener_count += 1
		elseif tail_listener ~= listener and self._listeners_next[listener] == nil then -- Prevent connecting the same listener more than once
			self._listeners_next[tail_listener] = listener
			self._listeners_back[listener] = tail_listener
			self._tail_listener = listener
			self._listener_count += 1
		end
		return {
			_listener = listener,
			_script_signal = self,
			_disconnect_listener = disconnect_listener,
			_disconnect_param = disconnect_param,
			Disconnect = ScriptConnection.Disconnect
		}
	end
	
	function ScriptSignal:GetListenerCount()
		return self._listener_count
	end
	
	function ScriptSignal:Fire(...)
		local fire_pointer_stack = self._fire_pointer_stack
		local stack_id = self._stack_count + 1
		self._stack_count = stack_id
		
		local listeners_next = self._listeners_next
		fire_pointer_stack[stack_id] = self._head_listener
		while true do
			local pointer = fire_pointer_stack[stack_id]
			fire_pointer_stack[stack_id] = listeners_next[pointer]
			if pointer ~= nil then
				coroutine.wrap(pointer)(...)
			else
				break
			end
		end
		self._stack_count -= 1
	end

	function ScriptSignal:FireUntil(continue_callback, ...)
		local fire_pointer_stack = self._fire_pointer_stack
		local stack_id = self._stack_count + 1
		self._stack_count = stack_id
	
		local listeners_next = self._listeners_next
		fire_pointer_stack[stack_id] = self._head_listener
		while true do
			local pointer = fire_pointer_stack[stack_id]
			fire_pointer_stack[stack_id] = listeners_next[pointer]
			if pointer ~= nil then
				coroutine.wrap(pointer)(...)
				if continue_callback() ~= true then
					fire_pointer_stack[stack_id] = nil
					break
				end
			else
				break
			end
		end
		self._stack_count -= 1
	end
	
	function MadworkScriptSignal.NewScriptSignal() --> [ScriptSignal]
		return {
			_fire_pointer_stack = {},
			_stack_count = 0,
			_listener_count = 0,
			_listeners_next = {},
			_listeners_back = {},
			_head_listener = nil,
			_tail_listener = nil,
			Connect = ScriptSignal.Connect,
			GetListenerCount = ScriptSignal.GetListenerCount,
			Fire = ScriptSignal.Fire,
			FireUntil = ScriptSignal.FireUntil,
		}
	end
	
	local RunService = game:GetService("RunService")
	local Heartbeat = RunService.Heartbeat
	
	Madwork = {
		NewScriptSignal = MadworkScriptSignal.NewScriptSignal,
		HeartbeatWait = function(wait_time) --> time_elapsed
			if wait_time == nil or wait_time == 0 then
				return Heartbeat:Wait()
			else
				local time_elapsed = 0
				while time_elapsed <= wait_time do
					local time_waited = Heartbeat:Wait()
					time_elapsed = time_elapsed + time_waited
				end
				return time_elapsed
			end
		end,
		ConnectToOnClose = function(task, run_in_studio_mode)
			if game:GetService("RunService"):IsStudio() == false or run_in_studio_mode == true then
				game:BindToClose(task)
			end
		end,
	}
end
