From e71f0cb091cfea01a348e5b9181458e7f21cc8a4 Mon Sep 17 00:00:00 2001
From: Elian Doran <contact@eliandoran.me>
Date: Sat, 15 Feb 2025 12:05:35 +0200
Subject: [PATCH] feat(calendar_view): draggable events

---
 package-lock.json                             | 10 +++
 package.json                                  |  1 +
 .../app/widgets/view_widgets/calendar_view.ts | 61 +++++++++++++++++--
 3 files changed, 67 insertions(+), 5 deletions(-)

diff --git a/package-lock.json b/package-lock.json
index 6ecbf9a9b..123acb09e 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -14,6 +14,7 @@
         "@excalidraw/excalidraw": "0.17.6",
         "@fullcalendar/core": "6.1.15",
         "@fullcalendar/daygrid": "6.1.15",
+        "@fullcalendar/interaction": "6.1.15",
         "@highlightjs/cdn-assets": "11.11.1",
         "@joplin/turndown-plugin-gfm": "1.0.61",
         "@mermaid-js/layout-elk": "0.1.7",
@@ -2155,6 +2156,15 @@
         "@fullcalendar/core": "~6.1.15"
       }
     },
+    "node_modules/@fullcalendar/interaction": {
+      "version": "6.1.15",
+      "resolved": "https://registry.npmjs.org/@fullcalendar/interaction/-/interaction-6.1.15.tgz",
+      "integrity": "sha512-DOTSkofizM7QItjgu7W68TvKKvN9PSEEvDJceyMbQDvlXHa7pm/WAVtAc6xSDZ9xmB1QramYoWGLHkCYbTW1rQ==",
+      "license": "MIT",
+      "peerDependencies": {
+        "@fullcalendar/core": "~6.1.15"
+      }
+    },
     "node_modules/@gar/promisify": {
       "version": "1.1.3",
       "resolved": "https://registry.npmjs.org/@gar/promisify/-/promisify-1.1.3.tgz",
diff --git a/package.json b/package.json
index d44202f15..ad05b0216 100644
--- a/package.json
+++ b/package.json
@@ -64,6 +64,7 @@
     "@excalidraw/excalidraw": "0.17.6",
     "@fullcalendar/core": "6.1.15",
     "@fullcalendar/daygrid": "6.1.15",
+    "@fullcalendar/interaction": "6.1.15",
     "@highlightjs/cdn-assets": "11.11.1",
     "@joplin/turndown-plugin-gfm": "1.0.61",
     "@mermaid-js/layout-elk": "0.1.7",
diff --git a/src/public/app/widgets/view_widgets/calendar_view.ts b/src/public/app/widgets/view_widgets/calendar_view.ts
index f485f763c..31572e2f3 100644
--- a/src/public/app/widgets/view_widgets/calendar_view.ts
+++ b/src/public/app/widgets/view_widgets/calendar_view.ts
@@ -1,7 +1,9 @@
-import type { EventSourceInput } from "@fullcalendar/core";
+import type { EventSourceInput, PluginDef } from "@fullcalendar/core";
 import froca from "../../services/froca.js";
 import ViewMode, { type ViewModeArgs } from "./view_mode.js";
 import type FNote from "../../entities/fnote.js";
+import server from "../../services/server.js";
+import ws from "../../services/ws.js";
 
 const TPL = `
 <div class="calendar-view">
@@ -40,13 +42,47 @@ export default class CalendarView extends ViewMode {
     }
 
     async renderList(): Promise<JQuery<HTMLElement> | undefined> {
+        const editable = true;
+
         const { Calendar } = await import("@fullcalendar/core");
-        const dayGridPlugin = (await import("@fullcalendar/daygrid")).default;
+        const plugins: PluginDef[] = [];
+        plugins.push((await import("@fullcalendar/daygrid")).default);
+
+        if (editable) {
+            plugins.push((await import("@fullcalendar/interaction")).default);
+        }
 
         const calendar = new Calendar(this.$calendarContainer[0], {
-            plugins: [ dayGridPlugin ],
+            plugins,
             initialView: "dayGridMonth",
-            events: await CalendarView.#buildEvents(this.noteIds)
+            events: await CalendarView.#buildEvents(this.noteIds),
+            editable,
+            eventDragStop: async (e) => {
+                const startDate = e.event.start?.toISOString().substring(0, 10);
+                let endDate = e.event.end?.toISOString().substring(0, 10);
+                const noteId = e.event.extendedProps.noteId;
+
+                // Fullcalendar end date is exclusive, not inclusive but we store it the other way around.
+                if (endDate) {
+                    const endDateParsed = new Date(endDate);
+                    endDateParsed.setDate(endDateParsed.getDate() - 1);
+                    endDate = endDateParsed.toISOString().substring(0, 10);
+                }
+
+                // Don't store the end date if it's empty.
+                if (endDate === startDate) {
+                    endDate = undefined;
+                }
+
+                // Update start date
+                const note = await froca.getNote(noteId);
+                if (!note) {
+                    return;
+                }
+
+                CalendarView.#setAttribute(note, "label", "startDate", startDate);
+                CalendarView.#setAttribute(note, "label", "endDate", endDate);
+            }
         });
         calendar.render();
 
@@ -70,7 +106,8 @@ export default class CalendarView extends ViewMode {
                 const eventData: typeof events[0] = {
                     title: title,
                     start: startDate,
-                    url: `#${note.noteId}`
+                    url: `#${note.noteId}`,
+                    noteId: note.noteId
                 };
 
                 const endDate = new Date(note.getAttributeValue("label", "endDate") ?? startDate);
@@ -116,4 +153,18 @@ export default class CalendarView extends ViewMode {
         return [ note.title ];
     }
 
+    static async #setAttribute(note: FNote, type: "label" | "relation", name: string, value: string | null | undefined) {
+        if (value) {
+            // Create or update the attribute.
+            await server.put(`notes/${note.noteId}/set-attribute`, { type, name, value });
+        } else {
+            // Remove the attribute if it exists on the server but we don't define a value for it.
+            const attributeId = note.getAttribute(type, name);
+            if (attributeId) {
+                await server.remove(`notes/${note.noteId}/attributes/${attributeId}`);
+            }
+        }
+        await ws.waitForMaxKnownEntityChangeId();
+    }
+
 }