separate playtime file

src/library.js

@@ -1,14 +1,41 @@
 'use strict'
 
 const path = require('path')
+const fs = require('fs')
 const { DIRS, readJson, writeJson } = require('./paths')
 const { prefixPath } = require('./prefixes')
 
 const REGISTRY = path.join(DIRS.DATA, 'apps.json')
 const SETTINGS = path.join(DIRS.DATA, 'settings.json')
 
+// Playtime lives in its own tiny file holding ONLY a number of seconds
+// (files/data/appdata/<id>/playtime.txt) so the running game can update it
+// every ~30s without rewriting the whole apps.json registry on each tick.
+function playtimeFile(id) {
+  return path.join(DIRS.DATA, 'appdata', id, 'playtime.txt')
+}
+
+function readPlaySeconds(id) {
+  try {
+    const n = parseInt(fs.readFileSync(playtimeFile(id), 'utf8').trim(), 10)
+    if (Number.isFinite(n) && n >= 0) return n
+  } catch {}
+  return null // no file yet -> fall back to the registry value
+}
+
+function writePlaySeconds(id, seconds) {
+  const file = playtimeFile(id)
+  fs.mkdirSync(path.dirname(file), { recursive: true })
+  fs.writeFileSync(file, String(Math.max(0, Math.round(seconds))))
+}
+
 function loadGames() {
-  return readJson(REGISTRY, [])
+  const games = readJson(REGISTRY, [])
+  for (const g of games) {
+    const ps = readPlaySeconds(g.id)
+    if (ps != null) g.playSeconds = ps
+  }
+  return games
 }
 
 function saveGames(games) {
@@ -30,11 +57,18 @@ function updateGame(id, patch) {
   const games = loadGames()
   const g = games.find(x => x.id === id)
   if (!g) return null
+  // playSeconds goes to its own tiny file; the registry just mirrors it for
+  // anything reading apps.json directly (loadGames prefers the file anyway).
+  if (patch.playSeconds !== undefined) writePlaySeconds(id, patch.playSeconds)
   Object.assign(g, patch)
   saveGames(games)
   return g
 }
 
+function clearPlaytime(id) {
+  return updateGame(id, { playSeconds: 0, lastPlayed: 0 })
+}
+
 function removeGame(id) {
   const games = loadGames()
   const idx = games.findIndex(g => g.id === id)
@@ -86,4 +120,4 @@ function resolvePrefixDir(game) {
   return prefixPath(defs.default || 'default')
 }
 
-module.exports = { loadGames, saveGames, getGame, addGame, updateGame, removeGame, loadSettings, saveSettings, newGame, resolvePrefixDir }
+module.exports = { loadGames, saveGames, getGame, addGame, updateGame, removeGame, loadSettings, saveSettings, newGame, resolvePrefixDir, clearPlaytime, readPlaySeconds, writePlaySeconds, playtimeFile }