-- Leaderboards written by Not

local FILENAME = "leaderboard.txt"
local lb = {}
local timeFinished = 0
local disable = false
local prevLap = 0
local splits = {}
local PATCH = nil
local help = true

-- Retry / changelevel map
local nextMap = nil

local Flags = 0

-- SPB flags with the least significance first
local F_SPBATK = 0x1
local F_SPBJUS = 0x2
local F_SPBBIG = 0x4
local F_SPBEXP = 0x8

local clearcheats = false

local START_TIME = 6 * TICRATE + (3 * TICRATE / 4)
local AFK_TIMEOUT = TICRATE * 5
local AFK_BALANCE = TICRATE * 60
local PREVENT_JOIN_TIME = START_TIME + TICRATE * 5

-- patch caching function
local cachePatches

local function lbID(map, flags)
	local id = tostring(map)
	if flags & F_SPBATK then
		id = id + "S"
	end

	return id
end

local function score_t(map, name, skin, color, time, splits, flags)
	return {
		["map"]    = map,
		["name"]   = name,
		["skin"]   = skin,
		["color"]  = color,
		["time"]   = time,
		["splits"] = splits,
		["flags"]  = flags
	}
end

-- Read the leaderboard
local f = io.open(FILENAME, "r")
if f then
	for l in f:lines() do
		-- Leaderboard is stored in the following tab separated format
		-- name, skin, color, time, splits, flags
		local t = {}
		for word in (l+"\t"):gmatch("(.-)\t") do
			table.insert(t, word)
		end

		local flags = 0
		if t[7] != nil then
			flags = tonumber(t[7])
		end

		local lbt = lb[lbID(t[1], flags)]
		if lbt == nil then
			lbt = {}
		end

		local spl = {}
		if t[6] != nil then
			for str in t[6]:gmatch("([^ ]+)") do
				table.insert(spl, tonumber(str))
			end
		end

		table.insert(
			lbt,
			score_t(
				t[1],
				t[2],
				t[3],
				t[4],
				tonumber(t[5]),
				spl,
				flags
			)
		)
		lb[lbID(t[1], flags)] = lbt
	end
	f:close()
else
	print("Failed to open file: ", FILENAME)
end

local function allowJoin(v)
	local y
	if v then
		y = "yes"
		hud.enable("freeplay")
	else
		y = "no"
		hud.disable("freeplay")
	end

	COM_BufInsertText(server, "allowteamchange " + y)
end

local function ingame()
	local n = 0
	for p in players.iterate do
		if p.valid and not p.spectator then
			n = $ + 1
		end
	end
	return n
end

local function initLeaderboard(player)
	if disable and leveltime < START_TIME then
		disable = ingame() > 1
	else
		disable = disable or ingame() > 1
	end
	player.afkTimeout = leveltime
end
addHook("PlayerSpawn", initLeaderboard)

local function doyoudare(player)
	if ingame() > 1 or player.spectator then
		CONS_Printf(player, "How dare you")
		return false
	end
	return true
end

local function retry(player, ...)
	if doyoudare(player) then
		-- Prevents bind crash
		if leveltime < 20 then
			return
		end
		nextMap = G_BuildMapName(gamemap)
	end
end
COM_AddCommand("retry", retry)

local function exitlevel(player, ...)
	if doyoudare(player) then
		G_ExitLevel()
	end
end
COM_AddCommand("exit", exitlevel)

local function mapNotExists(player, map)
	CONS_Printf(player, string.format("Map doesn't exist: %s", map:upper()))
end

local ALPH = "ABCDEFGHIJKLMNOPQRSTUVWXYZ"

local function changelevel(player, ...)
	if not doyoudare(player) then
		return
	end
	if leveltime < 20 then
		return
	end

	local map = ...
	if map == nil then
		CONS_Printf(player, "Usage: changelevel MAPXX")
		return
	end

	local p, q = map:upper():match("MAP(%w)(%w)$", 1)
	if not (p and q) then
		CONS_Printf(player, string.format("Invalid map name: %s", map))
		return
	end

	local mapnum = 0
	if tonumber(p) != nil then
		-- Non extended map numbers
		if tonumber(q) == nil then
			mapNotExists(player, map)
			return
		end
		mapnum = tonumber(p) * 10 + tonumber(q)
	else
		--Extended map numbers
		p = ALPH:find(p) - 1
		q = (tonumber(q) or ALPH:find(q) + 9)
		mapnum = 36 * p + q + 100
	end
	
	if mapheaderinfo[mapnum] == nil then
		mapNotExists(player, map)
		return
	end

	nextMap = G_BuildMapName(mapnum)
end
COM_AddCommand("changelevel", changelevel)

local function clearcheats(player)
	if not player.spectator then
		clearcheats = true
		CONS_Printf(player, "SPB Attack cheats will be cleared on next round")
	end
end
COM_AddCommand("spba_clearcheats", clearcheats)

--DEBUGGING
--local function printTable(tb)
--	for k, v in pairs(tb) do
--		for i = 1, #v do
--			print("TABLE: " + k, tb[k])
--			if v[i] != nil then
--				print(
--					v[i]["name"],
--					v[i]["skin"],
--					v[i]["color"],
--					v[i]["time"],
--					table.concat(v[i]["splits"]),
--					v[i]["flags"],
--					","
--				)
--					
--			end
--		end
--	end
--end

addHook("MapLoad", function()
		timeFinished = 0
		splits = {}
		prevLap = 0

		allowJoin(true)
		--printTable(lb)
	end
)

local function ticsToTime(tics)
	return string.format(
		"%d:%02d:%02d",
		G_TicsToMinutes(tics),
		G_TicsToSeconds(tics),
		G_TicsToCentiseconds(tics)
	)
end

-- Item patches have the amazing property of being displaced 12x 13y pixels
local iXoffset = 13 * FRACUNIT
local iYoffset = 12 * FRACUNIT
local function drawitem(v, x, y, scale, itempatch, vflags)
	v.drawScaled(
		x * FRACUNIT - FixedMul(iXoffset, scale),
		y * FRACUNIT - FixedMul(iYoffset, scale),
		scale,
		itempatch,
		vflags
	)
end

local function marquee(text, maxwidth)
	if #text <= maxwidth then
		return text
	end
	
	local shift = 16
	local pos = ((leveltime / 16) % (#text - maxwidth + shift * 2)) + 1 - shift
	pos = min(max(pos, 1), #text - maxwidth + 1)
	return text:sub(pos, pos + maxwidth - 1)
end

local bodium = {V_YELLOWMAP, V_GRAYMAP, V_BROWNMAP, 0}
local splitColor = {[true]=V_SKYMAP, [false]=V_REDMAP}
local splitSymbol = {[true]="-", [false]="+"}

local showSplit = 0
local VFLAGS = V_SNAPTOLEFT
local function drawScoreboard(v, player)
	if disable then return end
	if player != displayplayers[0] then return end

	cachePatches(v)
	
	local m = lb[lbID(gamemap, Flags)]
	if m == nil then
		return
	end

	for i, score in ipairs(m) do
		local name = score["name"]
		local skin = skins[score["skin"]]
		if skin == nil then
			skin = skins["sonic"]
		end
		local skinPatch = PATCH["FACERANK"][skin.name]

		--        |    OFFSET   | + |      PADDING       | * |INDEX|
		local h = ((200 / 4) + 4) + (skinPatch.height + 4) * (i - 1)

		v.draw(4, h, skinPatch, V_HUDTRANS | VFLAGS, v.getColormap("sonic", score["color"]))
		if player.name == name then
			v.draw(4, h, PATCH["CHILI"][(leveltime / 4) % 8], V_HUDTRANS | VFLAGS)
		end

		-- SPB
		if score["flags"] & F_SPBATK then
			local scale = FRACUNIT / 4
			drawitem(
				v,
				4 - 2,
				h - 2,
				scale,
				PATCH["SPB"],
				V_HUDTRANS | VFLAGS
			)
			if score["flags"] & F_SPBEXP then
				drawitem(
					v,
					skinPatch.width,
					h - 2,
					scale,
					PATCH["INV"][(leveltime / 4) % 6],
					V_HUDTRANS | VFLAGS
				)
			end
			if score["flags"] & F_SPBBIG then
				drawitem(
					v,
					4 - 2,
					h + skinPatch.height - 4,
					scale,
					PATCH["BIG"],
					V_HUDTRANS | VFLAGS
				)
			end
			if score["flags"] & F_SPBJUS then
				drawitem(
					v,
					skinPatch.width,
					h + skinPatch.height - 4,
					scale,
					PATCH["HYUD"],
					V_HUDTRANS | VFLAGS
				)
			end
		end

		-- Shorten long names
		local stralign = "left"
		local MAXWIDTH = 70
		local px = 6
		local py = 0
		if v.stringWidth(name) > MAXWIDTH then
			stralign = "thin"
			py = -1
			if v.stringWidth(name, 0, "thin") > MAXWIDTH then
				stralign = "small"
				py = 2
				if v.stringWidth(name, 0, "small") > MAXWIDTH then
					name = marquee(name, 15)
				end
			end
		end

		v.drawString(
			px + skinPatch.width,
			h + py,
			name,
			V_HUDTRANSHALF | V_ALLOWLOWERCASE | VFLAGS,
			stralign
		)

		-- Draw splits
		if showSplit > 0 and score["splits"][prevLap] != nil then
			local split = splits[prevLap] - score["splits"][prevLap]
			v.drawString(
				px + skinPatch.width,
				h + 8,
				splitSymbol[split < 0] + ticsToTime(abs(split)),
				V_HUDTRANSHALF | splitColor[split < 0] | VFLAGS
			)
		else
			v.drawString(
				px + skinPatch.width,
				h + 8,
				ticsToTime(score["time"]),
				V_HUDTRANSHALF | bodium[min(i, 4)] | VFLAGS
			)
		end
	end
end
hud.add(drawScoreboard, "game")

function cachePatches(v)
	if PATCH == nil then
		PATCH = {}

		PATCH["CHILI"] = {}
		for i = 1, 8 do
			PATCH["CHILI"][i-1] = v.cachePatch("K_CHILI" + i)
		end

		PATCH["FACERANK"] = {}
		for skin in skins.iterate do
			PATCH["FACERANK"][skin.name] = v.cachePatch(skin.facerank)
		end

		PATCH["SPB"] = v.cachePatch("K_ISSPB")
		PATCH["INV"] = {}
		for i = 1, 6 do
			PATCH["INV"][i - 1] = v.cachePatch("K_ISINV" + i)
		end
		PATCH["BIG"] = v.cachePatch("K_ISGROW")
		PATCH["HYUD"] = v.cachePatch("K_ISHYUD")
	end
end

-- True if a is better than b
local function lbComp(a, b)
	-- Calculates the difficulty, harder has higher priority
	-- if s is positive then a is harder
	-- if s is negative then b is harder
	-- if s is 0 then compare time
	local s = (a["flags"] & (F_SPBEXP | F_SPBBIG)) - (b["flags"] & (F_SPBEXP | F_SPBBIG))
	return s > 0 or not(s < 0 or a["time"] >= b["time"])
end

local function saveTime(player)
	local m = lb[lbID(gamemap, Flags)]
	if m == nil then
		m = {}
	end
	local newscore = score_t(
		gamemap,
		player.name,
		player.mo.skin,
		player.skincolor,
		timeFinished,
		splits,
		Flags
	)

	-- Check if you beat your previous best
	for i = 1, #m do
		if m[i]["name"] == player.name then
			if lbComp(newscore, m[i]) then
				table.remove(m, i)
				S_StartSound(nil, 130)
				break
			else
				-- You suck lol
				S_StartSound(nil, 201)
				return
			end
		end
	end

	print("Saving score")
	table.insert(
		m,
		newscore
	)

	table.sort(m, lbComp)
	while #m > 5 do
		table.remove(m)
	end

	lb[lbID(gamemap, Flags)] = m

	local f = assert(io.open(FILENAME, "w"))
	if f == nil then
		print("Failed to open file for writing: " + FILENAME)
		return
	end

	for k, v in pairs(lb) do
		for i = 1, #v do
			local s = v[i]
			f:write(
				s["map"], "\t",
				s["name"], "\t",
				s["skin"], "\t",
				s["color"], "\t",
				s["time"], "\t",
				table.concat(s["splits"], " "), "\t",
				s["flags"], "\n"
			)
		end
	end

	f:close()
end

-- DEBUGGING
--local function saveLeaderboard(player, ...)
--	timeFinished = tonumber(... or player.realtime)
--	splits = {1000, 2000, 3000}
--	saveTime(player)
--end
--COM_AddCommand("save", saveLeaderboard)

local function regLap(player)
	if player.laps > prevLap and timeFinished == 0 then
		prevLap = player.laps
		table.insert(splits, player.realtime)
		showSplit = 5 * TICRATE
	end
end

local function getGamer()
	for p in players.iterate do
		if p.valid and not p.spectator then
			return p
		end
	end
end

local function think()
	if nextMap then
		COM_BufInsertText(server, "map " + nextMap)
		nextMap = nil
	end

	if disable then
		if ingame() > 1 then
			for p in players.iterate do
				if p.valid and not p.spectator and not p.exiting then
					if p.cmd.buttons then
						p.afkTimeout = leveltime
					end
					if p.afkTimeout + AFK_BALANCE < leveltime then
						p.spectator = true
						chatprint("\x89" + p.name + " was moved to the other team for game balance", true)
					end
				end
			end
		else
			for p in players.iterate do
				if p.valid and not p.spectator then
					p.afkTimeout = leveltime
				end
			end
		end

		help = true
		return
	end
	if showSplit > 0 then
		showSplit = showSplit - 1
	end

	local p = getGamer()
	if leveltime < START_TIME then
		-- Help message
		if leveltime == START_TIME - TICRATE * 3 then
			if ingame() == 1  then
				if help then
					help = false
					chatprint("\x89Leaderboard Commands:\nretry exit findmap changelevel spba_clearcheats", true)
				end
			else
				help = true
			end
		end

		-- Autospec
		if leveltime == 1 then
			if p then
				for s in players.iterate do
					if s.valid and s.spectator then
						COM_BufInsertText(s, string.format("view \"%d\"", #p))
					end
				end
			end
		end
		
		-- Gamemode flags
		Flags = $ & !(F_SPBATK | F_SPBEXP | F_SPBBIG | F_SPBJUS)
		if leveltime > START_TIME - (3 * TICRATE) / 2 and server.SPBArunning then
			Flags = $ | F_SPBATK
			if server.SPBAexpert then
				Flags = $ | F_SPBEXP
			end
			if clearcheats then
				clearcheats = false
				for p in players.iterate do
					p.SPBAKARTBIG = false
					p.SPBAjustice = false
					p.SPBAshutup = false
				end
			end
			for p in players.iterate do
				if not p.spectator then
					if p.SPBAKARTBIG then
						Flags = $ | F_SPBBIG
					end
					if p.SPBAjustice then
						Flags = $ | F_SPBJUS
					end
				end
			end
		end
	end

	local cv_teamchange = CV_FindVar("allowteamchange")
	if p then
		if p.cmd.buttons then
			p.afkTimeout = leveltime
		end

		if leveltime > PREVENT_JOIN_TIME and p.afkTimeout + AFK_TIMEOUT > leveltime then
			if cv_teamchange.value then
				allowJoin(false)
			end
		elseif p.afkTimeout + AFK_TIMEOUT < leveltime then
			if not cv_teamchange.value then
				allowJoin(true)
			end
		end

		if p.laps >= mapheaderinfo[gamemap].numlaps and timeFinished == 0 then
			timeFinished = p.realtime
			saveTime(p)
		end
		regLap(p)
	elseif cv_teamchange.value == 0 then
		allowJoin(true)
	end
end
addHook("ThinkFrame", think)

local function interThink()
	if nextMap then
		COM_BufInsertText(server, "map " + nextMap)
		nextMap = nil
	end
	if not CV_FindVar("allowteamchange").value then
		allowJoin(true)
	end
end
addHook("IntermissionThinker", interThink)

local function netvars(net)
	lb = net($)
end
addHook("NetVars", netvars)