X-Git-Url: https://git.sesse.net/?a=blobdiff_plain;f=sql%2Fccbs.sql;h=ab682cdcacfa6b5dbe749b6722024e84328f834f;hb=63544803b9ba1949099c79b44e494437dea671a6;hp=4c42d56187a4c01f185ead62367b10f081503ff5;hpb=bf9387900ec73b0703128d8d2aa11996509006b8;p=ccbs

diff --git a/sql/ccbs.sql b/sql/ccbs.sql
index 4c42d56..ab682cd 100644
--- a/sql/ccbs.sql
+++ b/sql/ccbs.sql
@@ -224,3 +224,115 @@ $$
     LANGUAGE SQL
     STABLE
     RETURNS NULL ON NULL INPUT;
+
+-- get_max_score_for_players(tournament, round, playmode)
+CREATE FUNCTION get_max_score_for_players(integer, integer, varchar) RETURNS SETOF max_score
+    AS $$
+	SELECT player,
+	  (
+	     SELECT feetrating
+	     FROM songratings
+	     WHERE machine=(         -- only find songs on the machine we use
+	       SELECT machine FROM tournaments WHERE tournament=$1
+	     )
+	     AND song NOT IN (       -- not a song that has been in elimination or seeding
+	       SELECT song FROM scores 
+	       WHERE tournament=$1
+	         AND song IS NOT NULL
+                 AND parallel=0
+                 AND chosen='f'
+             )
+             AND (player,song) NOT IN (  -- not a song the player has chosen before, or is a random song in this round
+	       SELECT player,song FROM scores
+	       WHERE tournament=$1
+                 AND song IS NOT NULL
+                 AND ( chosen='t' OR round=$2 )
+             )
+             AND playmode=$3
+             ORDER BY feetrating DESC LIMIT 1
+	  ) * 1000 AS max_score FROM tournamentparticipation;
+$$
+    LANGUAGE SQL
+    STABLE
+    RETURNS NULL ON NULL INPUT;
+
+-- Find out, for each player in the group, what the maximum remaining score
+-- possibly can be, using get_max_score_for_{songs,players} (the first for
+-- selected but not played songs, the second for random songs that have not
+-- been chosen yet).
+--
+-- This doesn't solve problems we'd face with more than one chosen song, but it
+-- should be good enough.
+
+CREATE TYPE minmax_score AS (
+	player INTEGER,
+	min_score INTEGER,
+	max_score INTEGER
+);
+
+-- get_minmax_score_for_players(tournament, round, playmode)
+CREATE FUNCTION get_minmax_score_for_players(integer, integer, varchar) RETURNS SETOF minmax_score
+    AS $$
+DECLARE
+	ret minmax_score;
+	tp RECORD;
+	ts RECORD;
+BEGIN
+	FOR tp IN SELECT player FROM roundparticipation WHERE tournament=$1 AND round=$2 LOOP
+		ret.player := tp.player;
+		ret.min_score := 0;
+		ret.max_score := 0;
+
+		FOR ts IN SELECT song,score FROM scores WHERE tournament=$1 and round=$2 and player=tp.player LOOP
+			IF ts.score IS NOT NULL THEN
+				-- score is already given
+				ret.min_score := ret.min_score + ts.score;
+				ret.max_score := ret.max_score + ts.score;
+			ELSE
+				IF ts.song IS NOT NULL THEN
+					ret.max_score := ret.max_score + ( SELECT max_score FROM get_max_score_for_songs($1, $3) WHERE song=ts.song );
+				ELSE
+					ret.max_score := ret.max_score + ( SELECT max_score FROM get_max_score_for_players($1, $3) WHERE song=tp.player );
+				END IF;
+			END IF;
+		END LOOP;
+
+		RETURN NEXT ret;
+	END LOOP;
+	RETURN;
+END;
+$$
+    LANGUAGE plpgsql
+    STABLE
+    RETURNS NULL ON NULL INPUT;
+
+-- use the minmax_score as a basis for finding best and worst possible ranks
+CREATE TYPE minmax_rank AS (
+	player INTEGER,
+	best_rank INTEGER,
+	worst_rank INTEGER
+);
+
+-- get_minmax_score_for_players(tournament, round, playmode)
+CREATE FUNCTION get_minmax_rank_for_players(integer, integer, varchar) RETURNS SETOF minmax_rank
+    AS $$
+DECLARE
+	ret minmax_rank;
+	tp RECORD;
+BEGIN
+	CREATE TEMPORARY TABLE temp_minmax AS SELECT * FROM get_minmax_score_for_players($1, $2, $3);
+	FOR tp IN SELECT * FROM temp_minmax LOOP
+		ret.player = tp.player;
+		ret.best_rank = 1 + ( SELECT COUNT(*) FROM temp_minmax WHERE min_score >= tp.max_score AND player<>tp.player);
+		ret.worst_rank = 1 + ( SELECT COUNT(*) FROM temp_minmax WHERE max_score > tp.min_score AND player<>tp.player );
+
+		RETURN NEXT ret;
+	END LOOP;
+	DROP TABLE temp_minmax;	
+	RETURN;
+END;
+    $$
+    LANGUAGE plpgsql
+    VOLATILE    -- not really, but needed for the TEMPORARY TABLE
+    RETURNS NULL ON NULL INPUT;
+