From 2278ecd2584050c28e62f0f5fd8967b81d64cc5b Mon Sep 17 00:00:00 2001
From: Ilion Beyst <ilion.beyst@gmail.com>
Date: Thu, 13 Oct 2022 17:45:11 +0200
Subject: implement ListBotMatches, allow querying matches by bot/opponent pair

---
 planetwars-server/src/db/match_queries.rs | 86 +++++++++++++++++++++++++++++++
 planetwars-server/src/db/matches.rs       | 35 +++++--------
 planetwars-server/src/db/mod.rs           |  1 +
 3 files changed, 99 insertions(+), 23 deletions(-)
 create mode 100644 planetwars-server/src/db/match_queries.rs

(limited to 'planetwars-server/src/db')

diff --git a/planetwars-server/src/db/match_queries.rs b/planetwars-server/src/db/match_queries.rs
new file mode 100644
index 0000000..2e89706
--- /dev/null
+++ b/planetwars-server/src/db/match_queries.rs
@@ -0,0 +1,86 @@
+use super::matches::BotMatchOutcome;
+use crate::schema::matches;
+use chrono::NaiveDateTime;
+use diesel::pg::Pg;
+use diesel::query_builder::{AstPass, Query, QueryFragment, QueryId};
+use diesel::sql_types::*;
+use diesel::{PgConnection, QueryResult, RunQueryDsl};
+
+pub struct ListBotMatches {
+    pub bot_id: i32,
+    pub opponent_id: Option<i32>,
+    pub outcome: Option<BotMatchOutcome>,
+
+    pub before: Option<NaiveDateTime>,
+    pub after: Option<NaiveDateTime>,
+    pub amount: i64,
+}
+
+impl QueryFragment<Pg> for ListBotMatches {
+    fn walk_ast<'b>(&'b self, mut out: AstPass<'_, 'b, Pg>) -> QueryResult<()> {
+        out.unsafe_to_cache_prepared();
+
+        out.push_sql("SELECT matches.* FROM matches");
+        out.push_sql(" JOIN (");
+        out.push_sql(concat!(
+            "SELECT match_id, player_id, bot_version_id, bot_id ",
+            "FROM match_players ",
+            "JOIN bot_versions ON match_players.bot_version_id = bot_versions.id ",
+            "WHERE bot_id = "
+        ));
+        out.push_bind_param::<Integer, _>(&self.bot_id)?;
+        out.push_sql(") main_player ON matches.id = main_player.match_id");
+
+        if let Some(opponent_id) = self.opponent_id.as_ref() {
+            out.push_sql(" JOIN (");
+            out.push_sql(concat!(
+                "SELECT match_id, player_id, bot_version_id, bot_id ",
+                "FROM match_players ",
+                "JOIN bot_versions ON match_players.bot_version_id = bot_versions.id ",
+                "WHERE bot_id = "
+            ));
+            out.push_bind_param::<Integer, _>(opponent_id)?;
+            out.push_sql(") other_player ON matches.id = other_player.match_id");
+        }
+
+        out.push_sql(" WHERE matches.state = 'finished' AND matches.is_public = true");
+        if let Some(outcome) = self.outcome.as_ref() {
+            match outcome {
+                BotMatchOutcome::Win => {
+                    out.push_sql(" AND matches.winner = main_player.player_id");
+                }
+                BotMatchOutcome::Loss => {
+                    out.push_sql(" AND matches.winner <> main_player.player_id");
+                }
+                BotMatchOutcome::Tie => {
+                    out.push_sql(" AND matches.winner IS NULL");
+                }
+            }
+        }
+        if let Some(before) = self.before.as_ref() {
+            out.push_sql(" AND matches.created_at < ");
+            out.push_bind_param::<Timestamp, _>(before)?;
+            out.push_sql(" ORDER BY matches.created_at DESC");
+        } else if let Some(after) = self.after.as_ref() {
+            out.push_sql(" AND matches.created_at > ");
+            out.push_bind_param::<Timestamp, _>(after)?;
+            out.push_sql(" ORDER BY matches.created_at ASC");
+        }
+        out.push_sql(" LIMIT ");
+        out.push_bind_param::<BigInt, _>(&self.amount)?;
+
+        Ok(())
+    }
+}
+
+impl Query for ListBotMatches {
+    type SqlType = matches::SqlType;
+}
+
+impl QueryId for ListBotMatches {
+    type QueryId = ();
+
+    const HAS_STATIC_QUERY_ID: bool = false;
+}
+
+impl RunQueryDsl<PgConnection> for ListBotMatches {}
diff --git a/planetwars-server/src/db/matches.rs b/planetwars-server/src/db/matches.rs
index 813f998..d628b14 100644
--- a/planetwars-server/src/db/matches.rs
+++ b/planetwars-server/src/db/matches.rs
@@ -14,6 +14,7 @@ use crate::schema::{bot_versions, bots, maps, match_players, matches};
 
 use super::bots::{Bot, BotVersion};
 use super::maps::Map;
+use super::match_queries::ListBotMatches;
 
 #[derive(Insertable)]
 #[diesel(table_name = matches)]
@@ -173,35 +174,23 @@ pub fn list_public_matches(
 
 pub fn list_bot_matches(
     bot_id: i32,
+    opponent_id: Option<i32>,
     outcome: Option<BotMatchOutcome>,
     amount: i64,
     before: Option<NaiveDateTime>,
     after: Option<NaiveDateTime>,
     conn: &mut PgConnection,
 ) -> QueryResult<Vec<FullMatchData>> {
-    let mut query = finished_public_matches_query(before, after)
-        .inner_join(match_players::table)
-        .inner_join(
-            bot_versions::table.on(match_players::bot_version_id.eq(bot_versions::id.nullable())),
-        )
-        .filter(bot_versions::bot_id.eq(bot_id))
-        .select(matches::all_columns);
-
-    if let Some(outcome) = outcome {
-        query = match outcome {
-            BotMatchOutcome::Win => {
-                query.filter(matches::winner.eq(match_players::player_id.nullable()))
-            }
-            BotMatchOutcome::Loss => {
-                query.filter(matches::winner.ne(match_players::player_id.nullable()))
-            }
-            BotMatchOutcome::Tie => query.filter(matches::winner.is_null()),
-        };
-    }
-
-    query = query.limit(amount);
-
-    let matches = query.get_results::<MatchBase>(conn)?;
+    let lbm = ListBotMatches {
+        bot_id,
+        opponent_id,
+        outcome,
+        before,
+        after,
+        amount,
+    };
+
+    let matches = lbm.get_results::<MatchBase>(conn)?;
     fetch_full_match_data(matches, conn)
 }
 
diff --git a/planetwars-server/src/db/mod.rs b/planetwars-server/src/db/mod.rs
index f014cea..ec6f94e 100644
--- a/planetwars-server/src/db/mod.rs
+++ b/planetwars-server/src/db/mod.rs
@@ -1,5 +1,6 @@
 pub mod bots;
 pub mod maps;
+pub mod match_queries;
 pub mod matches;
 pub mod ratings;
 pub mod sessions;
-- 
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