From 7c6008077261ab84a3ef48073703e4bd8f2575f1 Mon Sep 17 00:00:00 2001
From: zadam <zadam.apps@gmail.com>
Date: Sun, 1 Sep 2019 08:58:13 +0200
Subject: [PATCH] basic implementation of "similar notes" widget

---
 db/migrations/0142__similar_notes_widget.sql  |  2 ++
 .../javascripts/dialogs/options/sidebar.js    |  3 +-
 src/public/javascripts/services/sidebar.js    |  3 +-
 .../javascripts/widgets/similar_notes.js      | 36 +++++++++++++++++++
 src/routes/api/options.js                     |  1 +
 src/routes/api/similar_notes.js               | 24 +++++++++++++
 src/routes/routes.js                          |  3 ++
 src/services/app_info.js                      |  2 +-
 8 files changed, 71 insertions(+), 3 deletions(-)
 create mode 100644 db/migrations/0142__similar_notes_widget.sql
 create mode 100644 src/public/javascripts/widgets/similar_notes.js
 create mode 100644 src/routes/api/similar_notes.js

diff --git a/db/migrations/0142__similar_notes_widget.sql b/db/migrations/0142__similar_notes_widget.sql
new file mode 100644
index 000000000..1cfa6d65f
--- /dev/null
+++ b/db/migrations/0142__similar_notes_widget.sql
@@ -0,0 +1,2 @@
+INSERT INTO options (name, value, utcDateCreated, utcDateModified, isSynced)
+VALUES ('similarNotesWidget', '{"enabled":false,"expanded":true,"position":60}', '2018-07-29T18:31:00.874Z', '2018-07-29T18:31:00.874Z', 0);
\ No newline at end of file
diff --git a/src/public/javascripts/dialogs/options/sidebar.js b/src/public/javascripts/dialogs/options/sidebar.js
index ff0f73e7a..5fc29a712 100644
--- a/src/public/javascripts/dialogs/options/sidebar.js
+++ b/src/public/javascripts/dialogs/options/sidebar.js
@@ -51,7 +51,8 @@ export default class SidebarOptions {
             {name: 'linkMap', title: 'Link map'},
             {name: 'noteInfo', title: 'Note info'},
             {name: 'noteRevisions', title: 'Note revisions'},
-            {name: 'whatLinksHere', title: 'What links here'}
+            {name: 'whatLinksHere', title: 'What links here'},
+            {name: 'similarNotes', title: 'Similar notes'}
         ].map(widget => {
             widget.option = this.parseJsonSafely(options[widget.name + 'Widget']) || {
                 enabled: true,
diff --git a/src/public/javascripts/services/sidebar.js b/src/public/javascripts/services/sidebar.js
index 8102fe888..be8688ff8 100644
--- a/src/public/javascripts/services/sidebar.js
+++ b/src/public/javascripts/services/sidebar.js
@@ -65,7 +65,8 @@ class Sidebar {
             import("../widgets/link_map.js"),
             import("../widgets/note_revisions.js"),
             import("../widgets/attributes.js"),
-            import("../widgets/what_links_here.js")
+            import("../widgets/what_links_here.js"),
+            import("../widgets/similar_notes.js")
         ])).map(m => m.default);
 
         const options = await optionsService.waitForOptions();
diff --git a/src/public/javascripts/widgets/similar_notes.js b/src/public/javascripts/widgets/similar_notes.js
new file mode 100644
index 000000000..d1a3bf2e0
--- /dev/null
+++ b/src/public/javascripts/widgets/similar_notes.js
@@ -0,0 +1,36 @@
+import StandardWidget from "./standard_widget.js";
+import linkService from "../services/link.js";
+import server from "../services/server.js";
+import treeCache from "../services/tree_cache.js";
+
+class SimilarNotesWidget extends StandardWidget {
+    getWidgetTitle() { return "Similar notes"; }
+
+    getMaxHeight() { return "200px"; }
+
+    async doRenderBody() {
+        const similarNoteIds = await server.get('similar_notes/' + this.ctx.note.noteId);
+
+        console.log(similarNoteIds);
+
+        if (similarNoteIds.length === 0) {
+            this.$body.text("No similar notes found ...");
+            return;
+        }
+
+        await treeCache.getNotes(similarNoteIds); // preload all at once
+
+        const $list = $("<ul>");
+
+        for (const similarNoteId of similarNoteIds) {
+            const $item = $("<li>")
+                .append(await linkService.createNoteLink(similarNoteId));
+
+            $list.append($item);
+        }
+
+        this.$body.empty().append($list);
+    }
+}
+
+export default SimilarNotesWidget;
\ No newline at end of file
diff --git a/src/routes/api/options.js b/src/routes/api/options.js
index 13f977ba8..32fdf81e4 100644
--- a/src/routes/api/options.js
+++ b/src/routes/api/options.js
@@ -29,6 +29,7 @@ const ALLOWED_OPTIONS = [
     'linkMapWidget',
     'noteRevisionsWidget',
     'whatLinksHereWidget',
+    'similarNotesWidget',
     'codeNotesMimeTypes'
 ];
 
diff --git a/src/routes/api/similar_notes.js b/src/routes/api/similar_notes.js
new file mode 100644
index 000000000..dd072cf98
--- /dev/null
+++ b/src/routes/api/similar_notes.js
@@ -0,0 +1,24 @@
+"use strict";
+
+const noteCacheService = require('../../services/note_cache');
+const repository = require('../../services/repository');
+
+async function getSimilarNotes(req) {
+    const noteId = req.params.noteId;
+
+    const note = await repository.getNote(noteId);
+
+    if (!note) {
+        return [404, `Note ${noteId} not found.`];
+    }
+
+    const results = await noteCacheService.findNotes(note.title);
+
+    return results
+        .map(r => r.noteId)
+        .filter(similarNoteId => similarNoteId !== noteId);
+}
+
+module.exports = {
+    getSimilarNotes
+};
\ No newline at end of file
diff --git a/src/routes/routes.js b/src/routes/routes.js
index c74a0b13e..e772d87b6 100644
--- a/src/routes/routes.js
+++ b/src/routes/routes.js
@@ -34,6 +34,7 @@ const searchRoute = require('./api/search');
 const dateNotesRoute = require('./api/date_notes');
 const linkMapRoute = require('./api/link_map');
 const clipperRoute = require('./api/clipper');
+const similarNotesRoute = require('./api/similar_notes');
 
 const log = require('../services/log');
 const express = require('express');
@@ -235,6 +236,8 @@ function register(app) {
     route(POST, '/api/clipper/notes', clipperMiddleware, clipperRoute.createNote, apiResultHandler);
     route(POST, '/api/clipper/open/:noteId', clipperMiddleware, clipperRoute.openNote, apiResultHandler);
 
+    apiRoute(GET, '/api/similar_notes/:noteId', similarNotesRoute.getSimilarNotes);
+
     app.use('', router);
 }
 
diff --git a/src/services/app_info.js b/src/services/app_info.js
index ea5e7ebb1..d1eb34232 100644
--- a/src/services/app_info.js
+++ b/src/services/app_info.js
@@ -4,7 +4,7 @@ const build = require('./build');
 const packageJson = require('../../package');
 const {TRILIUM_DATA_DIR} = require('./data_dir');
 
-const APP_DB_VERSION = 141;
+const APP_DB_VERSION = 142;
 const SYNC_VERSION = 10;
 const CLIPPER_PROTOCOL_VERSION = "1.0";