From cc7c5968cbceecdb1a41fa1db2de3c154815bfdc Mon Sep 17 00:00:00 2001
From: joe fleming <joe.fleming@gmail.com>
Date: Wed, 17 Oct 2018 15:08:30 -0700
Subject: [PATCH] feat: add history tracking

---
 src/lib/history.mjs | 30 ++++++++++++++++++++++++++++++
 1 file changed, 30 insertions(+)
 create mode 100644 src/lib/history.mjs

diff --git a/src/lib/history.mjs b/src/lib/history.mjs
new file mode 100644
index 0000000..1b1f939
--- /dev/null
+++ b/src/lib/history.mjs
@@ -0,0 +1,30 @@
+import fs from 'fs';
+import path from 'path';
+
+export default class History {
+  constructor() {
+    this.filePath = path.resolve('data', 'history.json');
+    try {
+      const data = fs.readFileSync(this.filePath);
+      this.db = data.length === 0 ? [] : JSON.parse(data);
+    } catch (e) {
+      this.db = [];
+    }
+  }
+
+  get(id) {
+    return this.db.find(doc => parseInt(doc.id, 10) === parseInt(id, 10));
+  }
+
+  add(doc) {
+    // prevent duplicate entries
+    if (this.get(doc.id)) return;
+
+    // add doc to history, truncate as needed
+    this.db.push(doc);
+    if (this.db.length > 1000) this.db.splice(0, 1000);
+
+    // write the updated content to the file
+    fs.writeFileSync(this.filePath, JSON.stringify(this.db), { encoding: 'utf8' });
+  }
+}