Scope live chat to the current match and save match history

tests/unit/server-chat.test.ts

@@ -1,5 +1,5 @@
 import { afterEach, beforeEach, describe, expect, it, vi } from 'vitest';
-import { mkdir, utimes, writeFile } from 'node:fs/promises';
+import { mkdir, rm, utimes, writeFile } from 'node:fs/promises';
 import { join } from 'node:path';
 import { newFixture, type Fixture } from '../helpers/fixture.js';
 import { gameEvent } from '../helpers/telemetry.js';
@@ -137,8 +137,70 @@ describe('server chat API', () => {
         await log(['60:50 say;abc;0;Player;previous server', '61:40 say;abc;0;Player;current server'], 100);
         const body = await (await get()).json();
         const messages = body.entries.filter((entry: { type: string }) => entry.type === 'message');
-        expect(messages).toHaveLength(2);
-        expect(messages[0].context).toEqual({ realTime: at(50), matchElapsedMs: null, round: null });
-        expect(messages[1].context).toEqual({ realTime: at(100), matchElapsedMs: 20_000, round: 2 });
+        expect(messages).toHaveLength(1);
+        expect(messages[0].message.message).toBe('current server');
+        expect(messages[0].context).toEqual({ realTime: at(100), matchElapsedMs: 20_000, round: 2 });
+    });
+
+    it('clears at a new match before it writes to the log and keeps the old chat with its match', async () => {
+        await report('game_start', 0);
+        await report('round_change', 20, 4);
+        await log(['60:30 say;abc;0;Player;old match'], 30);
+        expect((await (await get()).json()).entries[0].message.message).toBe('old match');
+        await report('game_end', 60, 4);
+        await report('game_start', 80);
+        expect((await (await get()).json()).entries).toEqual([]);
+        await report('heartbeat', 90, 2);
+        await log(['60:30 say;abc;0;Player;old match', '61:40 say;abc;0;Player;new match'], 100);
+        const body = await (await get()).json();
+        expect(body.entries.map((entry: any) => entry.message.message)).toEqual(['new match']);
+        const { getMatchDetail } = await import('../../src/lib/server/fleet/match-history.js');
+        expect(getMatchDetail(1)!.chat.map(entry => entry.type === 'message' && entry.message.message)).toEqual(['old match']);
+    });
+
+    it('clears on log boundaries and clock resets before the next telemetry report', async () => {
+        for (const boundary of ['61:00 InitGame:', '0:00 InitGame:', '0:00 J;abc;0;Player', 'InitGame:']) {
+            await report('game_start', 0);
+            await report('heartbeat', 20, 4);
+            await log(['60:30 say;abc;0;Player;old match'], 30);
+            expect((await (await get()).json()).entries).toHaveLength(1);
+            await log(['60:30 say;abc;0;Player;old match', boundary], 60);
+            expect((await (await get()).json()).entries, boundary).toEqual([]);
+        }
+    });
+
+    it('shows only the latest log session without telemetry', async () => {
+        await log(['80:00 say;abc;0;Player;old match', '0:00 InitGame:', '0:30 say;abc;0;Player;new match'], 60);
+        const entries = (await (await get()).json()).entries;
+        expect(entries.filter((entry: any) => entry.type === 'message').map((entry: any) => entry.message.message))
+            .toEqual(['new match']);
+        await log(['80:00 say;abc;0;Player;old match', '0:00 InitGame:'], 60);
+        expect((await (await get()).json()).entries.some((entry: any) => entry.type === 'message')).toBe(false);
+    });
+
+    it('collects without a viewer and retains repeated messages after log rotation, restart and server deletion', async () => {
+        await report('game_start', 0);
+        await report('heartbeat', 20, 4);
+        const lines = ['60:30 say;abc;0;Player;hello', '60:30 say;abc;0;Player;hello'];
+        await log(lines, 30);
+        const { collectFleetChat } = await import('../../src/lib/server/fleet/chat.js');
+        await collectFleetChat();
+        await collectFleetChat();
+        await report('game_end', 60, 4);
+        await log([...lines, '61:00 ExitLevel:'], 60);
+        await collectFleetChat();
+        const { closeDb, db } = await import('../../src/lib/server/db/index.js');
+        const { getMatchDetail } = await import('../../src/lib/server/fleet/match-history.js');
+        const saved = getMatchDetail(1)!.chat;
+        expect(saved).toHaveLength(2);
+        expect(saved[0]).toMatchObject({ message: { message: 'hello' }, context: { realTime: at(30), round: 4 } });
+        await rm(join(fixture.t5, SERVER, 'logs'), { recursive: true });
+        closeDb();
+        expect((await (await get()).json()).entries).toEqual(saved);
+        db().prepare('DELETE FROM servers WHERE name = ?').run(SERVER);
+        expect(getMatchDetail(1)!.chat).toEqual(saved);
+        // Match retention also removes its chat, with no orphaned history.
+        db().prepare('DELETE FROM leaderboard_matches WHERE id = 1').run();
+        expect(db().prepare('SELECT * FROM match_chat').all()).toEqual([]);
     });
 });