From 516a9035656cb53cb47f66908818ed2afbf578df Mon Sep 17 00:00:00 2001
From: "Daniel J. Summers" <daniel@bitbadger.solutions>
Date: Wed, 11 Dec 2024 20:22:10 -0500
Subject: [PATCH] Add relative-date-time component

---
 src/lib/UI/Component.php |  16 +++---
 src/public/script/mpj.js | 111 ++++++++++++++++++++++++++++++++++++++-
 2 files changed, 118 insertions(+), 9 deletions(-)

diff --git a/src/lib/UI/Component.php b/src/lib/UI/Component.php
index d5ccde8..1152530 100644
--- a/src/lib/UI/Component.php
+++ b/src/lib/UI/Component.php
@@ -36,7 +36,9 @@ class Component
             <section id=journalItems class="row row-cols-1 row-cols-md-2 row-cols-lg-3 row-cols-xl-4 g-3" hx-target=this
                      hx-swap=outerHTML aria-label="Prayer Requests"><?php
             $spacer = '<span>&nbsp;</span>';
-            foreach ($reqs->items as /** @var Request $req */ $req) { ?>
+            foreach ($reqs->items as /** @var Request $req */ $req) {
+                $lastPrayed   = $req->lastPrayed;
+                $lastActivity = $lastPrayed->getOrDefault($req->history[0]->asOf); ?>
                 <div class=col>
                 <div class="card h-100">
                     <div class="card-header p-0 d-flex" role=toolbar>
@@ -58,10 +60,8 @@ class Component
                         <p class=request-text><?=htmlentities($req->currentText);?>
                     </div>
                     <div class="card-footer text-end text-muted px-1 py-0">
-                        <em><?php
-                            $lastPrayed = $req->lastPrayed;
-                            echo 'last ' . $lastPrayed->map(fn() => 'prayed')->getOrDefault('activity') . ' '
-                                . self::relativeDate($lastPrayed->getOrDefault($req->history[0]->asOf)); ?>
+                        <em>last <?=$lastPrayed->map(fn() => 'prayed')->getOrDefault('activity')?>
+                            <?=self::relativeDate($lastPrayed->getOrDefault($req->history[0]->asOf))?>
                         </em>
                     </div>
                 </div>
@@ -115,9 +115,9 @@ class Component
     public static function relativeDate(string $date): string
     {
         $parsed = new DateTimeImmutable($date);
-        $inZone = $parsed->setTimezone(new DateTimeZone($_REQUEST['time_zone']));
-        return sprintf('<span title="%s">%s</span>', date_format($inZone, 'l, F j, Y \a\t g:ia T'),
-            RelativeDate::between('now', $parsed));
+        $iso    = $parsed->format('c');
+        $title  = $parsed->setTimezone(new DateTimeZone($_REQUEST['time_zone']))->format('l, F j, Y \a\t g:ia T');
+        return "<relative-date-time title=\"$title\" interval=5000>$iso</relative-date-time>";
     }
 
     /**
diff --git a/src/public/script/mpj.js b/src/public/script/mpj.js
index 946b751..d9d7c72 100644
--- a/src/public/script/mpj.js
+++ b/src/public/script/mpj.js
@@ -1,7 +1,7 @@
 "use strict"
 
 /** myPrayerJournal script */
-this.mpj = {
+window.mpj = {
   /**
    * Show a message via toast
    * @param {string} message The message to show
@@ -102,3 +102,112 @@ htmx.on("htmx:configRequest", function (evt) {
 })
 
 mpj.deriveTimeZone()
+
+class RelativeDateTime extends HTMLElement {
+  static observedAttributes = ["interval"]
+
+  static #LessThanXMinutes = Symbol()
+  static #XMinutes = Symbol()
+  static #AboutXHours = Symbol()
+  static #XDays = Symbol()
+  static #AboutXMonths = Symbol()
+  static #XMonths = Symbol()
+  static #AboutXYears = Symbol()
+  static #OverXYears = Symbol()
+  static #AlmostXYears = Symbol()
+
+  static #messages = new Map([
+    [RelativeDateTime.#LessThanXMinutes, ['less than a minute', 'less than %d minutes']],
+    [RelativeDateTime.#XMinutes, ['a minute', '%d minutes']],
+    [RelativeDateTime.#AboutXHours, ['about an hour', 'about %d hours']],
+    [RelativeDateTime.#XDays, ['a day', '%d days']],
+    [RelativeDateTime.#AboutXMonths, ['about a month', 'about %d months']],
+    [RelativeDateTime.#XMonths, ['a month', '%d months']],
+    [RelativeDateTime.#AboutXYears, ['about a year', 'about %d years']],
+    [RelativeDateTime.#OverXYears, ['over a year', 'over %d years']],
+    [RelativeDateTime.#AlmostXYears, ['almost a year', 'almost %d years']],
+  ])
+
+  static #aDay = 1440.0
+  static #almost2Days = 2520.0
+  static #aMonth = 43200.0
+  static #twoMonths = 86400.0
+
+  /** @type Date The date/time for this relative date */
+  #jsDate
+  /** @type ?number The interval timer for this element */
+  #timeOut = null
+
+  constructor() {
+    super();
+  }
+
+  #update() {
+
+    const now = new Date()
+    const minutes = Math.abs((this.#jsDate.getTime() - now.getTime()) / 60 / 1000);
+    const months = Math.round(minutes / RelativeDateTime.#aMonth);
+    const years = Math.floor(months / 12);
+
+    /** @type symbol */
+    let typ
+    /** @type number */
+    let nbr
+
+    if (minutes < 1.0) {
+      typ = RelativeDateTime.#LessThanXMinutes
+      nbr = 1
+    } else if (minutes < 45.0) {
+      typ = RelativeDateTime.#XMinutes
+      nbr = Math.round(minutes)
+    } else if (minutes < 90.0) {
+      typ = RelativeDateTime.#AboutXHours
+      nbr = 1
+    } else if (minutes < RelativeDateTime.#aDay) {
+      typ = RelativeDateTime.#AboutXHours
+      nbr = Math.round(minutes / 60)
+    } else if (minutes < RelativeDateTime.#almost2Days) {
+      typ = RelativeDateTime.#XDays
+      nbr = 1
+    } else if (minutes < RelativeDateTime.#aMonth) {
+      typ = RelativeDateTime.#XDays
+      nbr = Math.round(minutes / RelativeDateTime.#aDay)
+    } else if (minutes < RelativeDateTime.#twoMonths) {
+      typ = RelativeDateTime.#AboutXMonths
+      nbr = Math.round(minutes / RelativeDateTime.#aMonth)
+    } else if (months < 12) {
+      typ = RelativeDateTime.#XMonths
+      nbr = Math.round(minutes / RelativeDateTime.#aMonth)
+    } else if (months % 12 < 3) {
+      typ = RelativeDateTime.#AboutXYears
+      nbr = years
+    } else if (months % 12 < 9) {
+      typ = RelativeDateTime.#OverXYears
+      nbr = years
+    } else {
+      typ = RelativeDateTime.#AlmostXYears
+      nbr = years + 1
+    }
+
+    const tmpl = RelativeDateTime.#messages.get(typ)
+    const message = nbr === 1 ? tmpl[0] : tmpl[1].replace("%d", nbr.toString())
+    this.innerText = this.#jsDate < now ? `${message} ago` : `in ${message}`
+  }
+
+  connectedCallback() {
+    this.#jsDate = new Date(this.innerText)
+    this.#update()
+  }
+
+  disconnectedCallback() {
+    if (this.#timeOut) clearInterval(this.#timeOut)
+  }
+
+  attributeChangedCallback(name, oldValue, newValue) {
+    if (this.#timeOut) clearInterval(this.#timeOut)
+    if (this.#jsDate) this.#update()
+    this.#timeOut = setInterval(() => this.#update, parseInt(newValue))
+  }
+}
+
+customElements.define("relative-date-time", RelativeDateTime)