Rewrite scoring algorithm

mods/ctf_stats/README.md

@@ -0,0 +1,14 @@
+## Score
+
+* +5 for picking up a flag.
+* +20 for then capturing the flag.
+* +X for killing someone, where X is:
+	* +5 for every kill they've made since last death in this match.
+	* `15 * kd` ratio, with variable cap based on player's score:
+		* capped at X * 10 for < X * 100 player score
+			(eg 10 for 100, 20 for 200, 40 for 400+).
+		* capped to 40.
+		* deaths > kills gives 0 score
+	* Limited to 0 ≤ X ≤ 100
+	* If they don't have a good weapon: half given score.
+	  A good weapon is a non-default one which is not a pistol, stone sword, or crossbow.

mods/ctf_stats/gui.lua

@@ -15,36 +15,10 @@ function ctf_stats.get_formspec_match_summary(stats)
 	return ret
 end
 
-local function calc_scores(players)
-	for i = 1, #players do
-		local pstat = players[i]
-		pstat.kills = pstat.kills or 0
-		pstat.deaths = pstat.deaths or 0
-		pstat.captures = pstat.captures or 0
-		pstat.attempts = pstat.attempts or 0
-		local kd = pstat.kills
-		if pstat.deaths > 0 then
-			kd = kd / pstat.deaths
-		end
-		--[[local killbonus = 0
-		if pstat.kills > 50 and pstat.kills < 200 then
-			killbonus = pstat.kills - 50
-		elseif pstat.kills >= 200 then
-			killbonus = 150
-		end]]--
-		pstat.score = --killbonus +
-		              50 * pstat.captures +
-					  8 * pstat.attempts +
-				      6  * kd
-	end
+function ctf_stats.get_formspec(title, players)
 	table.sort(players, function(one, two)
 		return one.score > two.score
 	end)
-end
-ctf_stats.calc_scores = calc_scores
-
-function ctf_stats.get_formspec(title, players)
-	calc_scores(players)
 
 	local ret = "size[12,6.5]"
 	ret = ret .. "vertlabel[0,0;" .. title .. "]"
@@ -81,7 +55,9 @@ function ctf_stats.get_formspec(title, players)
 end
 
 function ctf_stats.get_html(title, players)
-	calc_scores(players)
+	table.sort(players, function(one, two)
+		return one.score > two.score
+	end)
 
 	local ret = "<h1>" .. title .. "</h1>"
 	ret = ret .. "<table>" ..
@@ -148,7 +124,11 @@ minetest.register_chatcommand("rankings", {
 				pstat.color = nil
 				table.insert(players, pstat)
 			end
-			calc_scores(players)
+
+			table.sort(players, function(one, two)
+				return one.score > two.score
+			end)
+
 			local place = -1
 			local me = nil
 			for i = 1, #players do

mods/ctf_stats/init.lua

@@ -1,76 +1,95 @@
 ctf_stats = {}
 
+local storage = minetest.get_mod_storage()
+local data_to_persist = { "matches", "players" }
+
 function ctf_stats.load()
 	local file = io.open(minetest.get_worldpath() .. "/ctf_stats.txt", "r")
 	if file then
 		local table = minetest.deserialize(file:read("*all"))
+		file:close()
 		if type(table) == "table" then
+			ctf.log("ctf_stats", "Migrating stats...")
 			ctf_stats.matches = table.matches
-			ctf_stats.current = table.current
 			ctf_stats.players = table.players
-			return
+
+			for name, player_stats in pairs(ctf_stats.players) do
+				if not player_stats.score or player_stats.score < 0 then
+					player_stats.score = 0
+				end
+				if player_stats.score > 300 then
+					player_stats.score = (player_stats.score - 300) / 30 + 300
+				end
+				if player_stats.score > 800 then
+					player_stats.score = 800
+				end
+			end
+			ctf.needs_save = true
+		end
+		os.remove(minetest.get_worldpath() .. "/ctf_stats.txt")
+	else
+		for _, key in pairs(data_to_persist) do
+			ctf_stats[key] = minetest.parse_json(storage:get_string(key))
 		end
 	end
 
-	ctf_stats.matches = {
-		blue_wins = 0,
-		red_wins = 0,
+	ctf_stats.matches = ctf_stats.matches or {
+		wins = {
+			blue = 0,
+			red = 0,
+		},
 		skipped = 0
 	}
 
-	ctf_stats.current = {
+	ctf_stats.current = ctf_stats.current or {
 		red = {},
 		blue = {}
 	}
 
-	ctf_stats.players = {}
+	ctf_stats.players = ctf_stats.players or {}
 end
 
 ctf.register_on_save(function()
-	local file = io.open(minetest.get_worldpath().."/ctf_stats.txt", "w")
-	if file then
-		file:write(minetest.serialize({
-			matches = ctf_stats.matches,
-			current = ctf_stats.current,
-			players = ctf_stats.players
-		}))
-		file:close()
-	else
-		ctf.error("io", "CTF file failed to save!")
+	for _, key in pairs(data_to_persist) do
+		storage:set_string(key, minetest.write_json(ctf_stats[key]))
 	end
 
 	return nil
 end)
 
+-- Returns a tuple: `player_stats`, `match_player_stats`
 function ctf_stats.player(name)
-	local tplayer = ctf.player(name)
-	local player = ctf_stats.players[name]
-	if not player then
-		player = {
+	local player_stats = ctf_stats.players[name]
+	if not player_stats then
+		player_stats = {
 			name = name,
-			red_wins = 0,
-			blue_wins = 0,
+			wins = {
+				red = 0,
+				blue = 0,
+			},
 			kills = 0,
 			deaths = 0,
 			captures = 0,
 			attempts = 0,
-			score = -1,
+			score = 0,
 		}
-		ctf_stats.players[name] = player
+		ctf_stats.players[name] = player_stats
 	end
 
-	local mplayer = ctf_stats.current.red[name] or
-			ctf_stats.current.blue[name]
+	local match_player_stats =
+			ctf_stats.current.red[name] or ctf_stats.current.blue[name]
 
-	return player, mplayer
+	return player_stats, match_player_stats
 end
 
 ctf.register_on_join_team(function(name, tname)
-	ctf_stats.current[tname][name] = {
+	ctf_stats.current[tname][name] = ctf_stats.current[tname][name] or {
 		kills = 0,
+		kills_since_death = 0,
 		deaths = 0,
 		attempts = 0,
-		captures = 0
+		captures = 0,
+		score = 0,
 	}
 end)
 
@@ -83,14 +102,16 @@ ctf_flag.register_on_capture(function(name, flag)
 	local main, match = ctf_stats.player(name)
 	if main and match then
 		main.captures  = main.captures  + 1
+		main.score     = main.score     + 20
 		match.captures = match.captures + 1
+		match.score     = match.score     + 20
 		ctf.needs_save = true
 	end
 end)
 
 ctf_match.register_on_winner(function(winner)
 	ctf.needs_save = true
-	ctf_stats.matches[winner .. "_wins"] = ctf_stats.matches[winner .. "_wins"] + 1
+	ctf_stats.matches.wins[winner] = ctf_stats.matches.wins[winner] + 1
 end)
 
 ctf_match.register_on_new_match(function()
@@ -111,7 +132,9 @@ ctf_flag.register_on_pick_up(function(name, flag)
 	local main, match = ctf_stats.player(name)
 	if main and match then
 		main.attempts  = main.attempts  + 1
+		main.score     = main.score     + 5
 		match.attempts = match.attempts + 1
+		match.score     = match.score     + 5
 		ctf.needs_save = true
 	end
 end)
@@ -120,17 +143,73 @@ ctf_flag.register_on_precapture(function(name, flag)
 	local tplayer = ctf.player(name)
 	local main, match = ctf_stats.player(name)
 	if main then
-		main[tplayer.team .. "_wins"] = main[tplayer.team .. "_wins"] + 1
+		main.wins[tplayer.team] = main.wins[tplayer.team] + 1
 		ctf.needs_save = true
 	end
 	return true
 end)
 
+local good_weapons = {
+	"default:sword_steel",
+	"shooter:grenade",
+	"shooter:shotgun",
+	"shooter:rifle",
+	"shooter:machine_gun",
+}
+local function invHasGoodWeapons(inv)
+	for _, weapon in pairs(good_weapons) do
+		if inv:contains_item("main", weapon) then
+			return true
+		end
+	end
+	return false
+end
+
+local function calculateKillReward(victim, killer)
+	local vmain, victim_match = ctf_stats.player(victim)
+
+	-- +5 for every kill they've made since last death in this match.
+	local reward = victim_match.kills_since_death * 5
+	ctf.log("ctf_stats", "Player " .. victim .. " has made " .. reward .. " kills since last death")
+
+	-- 15 * kd ration, with variable based on player's score
+	local kdreward = 15 * vmain.kills / (vmain.deaths + 1)
+	local max = vmain.score / 10
+	if kdreward > max then
+		kdreward = max
+	end
+	if kdreward > 40 then
+		kdreward = 40
+	end
+
+	-- Limited to  0 <= X <= 100
+	if reward > 100 then
+		reward = 100
+	elseif reward < 0 then
+		reward = 0
+	end
+
+	-- Half if no good weapons
+	local inv = minetest.get_inventory({ type="player", name = victim })
+	if not invHasGoodWeapons(inv) then
+		ctf.log("ctf_stats", "Player " .. victim .. " has no good weapons")
+		reward = reward * 0.5
+	else
+		ctf.log("ctf_stats", "Player " .. victim .. " has good weapons")
+	end
+
+	return reward
+end
+
 ctf.register_on_killedplayer(function(victim, killer)
 	local main, match = ctf_stats.player(killer)
 	if main and match then
+		local reward = calculateKillReward(victim, killer)
 		main.kills  = main.kills  + 1
+		main.score  = main.score  + reward
 		match.kills = match.kills + 1
+		match.score = match.score + reward
+		match.kills_since_death = match.kills_since_death + 1
 		ctf.needs_save = true
 	end
 end)
@@ -140,6 +219,7 @@ minetest.register_on_dieplayer(function(player)
 	if main and match then
 		main.deaths = main.deaths + 1
 		match.deaths = match.deaths + 1
+		match.kills_since_death = 0
 		ctf.needs_save = true
 	end
 end)

mods/ctf_team_base/init.lua

@@ -42,7 +42,6 @@ local function get_is_player_pro(player)
 		pstat.color = nil
 		table.insert(players, pstat)
 	end
-	ctf_stats.calc_scores(players)
 	return ctf_stats.player(player:get_player_name()).score > 0
 end