Shift version history to separate file

client/homebrew/utils/versionHistory.js

@@ -0,0 +1,50 @@
+const HISTORY_PREFIX = 'HOMEBREWERY-HISTORY'
+const HISTORY_SAVE_DELAYS = [
+	1,			// 1 minute
+	30,			// 30 minutes
+	60,			// 60 minutes
+	24 * 60,	// 24 hours
+	5 * 24 * 60 // 5 days
+];
+const HISTORY_VERSION_DIFFS = [
+	1,
+	10,
+	50,
+	100,
+	250
+]
+
+function updateStoredBrew(key, brew){
+    const archiveBrew = {};
+    archiveBrew.title = brew.title;
+    archiveBrew.text = brew.text;
+    archiveBrew.style = brew.style;
+    archiveBrew.savedAt = new Date();
+    archiveBrew.version = brew.version;
+    localStorage.setItem(key, JSON.stringify(archiveBrew));
+    return;
+};
+
+export function updateHistory(brew) {
+    const historyKeys = [];
+    [1,2,3,4,5].forEach((i)=>{
+        historyKeys.push(`${HISTORY_PREFIX}-${brew.shareId}-${i}`);
+    });
+    historyKeys.forEach((key, i)=>{
+        const storedVersion = localStorage.getItem(key);
+        if(!storedVersion){
+            updateStoredBrew(key, brew);
+            return;
+        }
+        
+        const storedObject = JSON.parse(storedVersion);
+        let targetTime = new Date(storedObject.savedAt);
+        targetTime.setMinutes(targetTime.getMinutes() + HISTORY_SAVE_DELAYS[i]);
+
+        const targetVersion = storedObject.version + HISTORY_VERSION_DIFFS[i];
+
+        if(new Date() >= targetTime && brew.version >= targetVersion){
+            updateStoredBrew(key, brew);
+        }
+    });
+};