From edb9e94a98458fbac00075a3a407246668123eb4 Mon Sep 17 00:00:00 2001
From: Mitsuo Tokumori <mitsuo@tokumori.xyz>
Date: Sun, 9 Mar 2025 20:30:25 +0900
Subject: Add world clocks to block_time

---
 app/static/block_time.js | 85 ++++++++++++++++++++++++++++++++++++++++++++----
 app/static/script.js     | 18 ++++++----
 app/static/style.css     | 33 +++++++++++++++----
 app/templates/index.html |  5 +--
 4 files changed, 120 insertions(+), 21 deletions(-)

diff --git a/app/static/block_time.js b/app/static/block_time.js
index d6510ae..8841e7b 100644
--- a/app/static/block_time.js
+++ b/app/static/block_time.js
@@ -1,13 +1,86 @@
 function init() {
-  initTimeVisualizer('timeVisualizer');
+  initTimeVisualizer("time-timeVisualizer");
 }
 
 export function updateTime() {
-  fetch("/time")
-    .then(res => res.json())
-    .then(data => {
-      document.getElementById("weatherSummary").innerText = data.time;
-    });
+  const cities = [
+    { name: "Tokyo", tz: "Asia/Tokyo", note: "JST" },
+    { name: "Berlin", tz: "Europe/Berlin", note: "CET, CEST from last Sunday in March at 02:00 to last Sunday in October at 03:00" },
+    { name: "London", tz: "Europe/London", note: "GMT, BST from last Sunday of March to last Sunday of October" },
+    { name: "Lima", tz: "America/Lima", note: "aka: \"PET\""},
+    { name: "Santiago", tz: "America/Santiago", note: "aka: \"CLT\""},
+    { name: "New York", tz: "America/New_York", note: "EST, EDT from second Sunday in March at 02:00 to first Sunday in November at 02:00" },
+    { name: "Chicago", tz: "America/Chicago", note: "CST, CDT from second Sunday in March at 02:00 to first Sunday in November at 02:00" },
+    { name: "Denver", tz: "America/Denver", note: "MST, MDT from second Sunday in March at 02:00 to first Sunday in November at 02:00" },
+    { name: "Los Angeles", tz: "America/Los_Angeles", note: "PST, PDT from second Sunday in March at 02:00 to first Sunday in November at 02:00" },
+    { name: "Arizona", tz: "America/Denver", note: "MST" },
+    { name: "Anchorage", tz: "America/Anchorage", note: "AKST, AKDT from second Sunday in March at 02:00 to first Sunday in November at 02:00" },
+    { name: "Honolulu", tz: "Pacific/Honolulu", note: "HST" },
+  ];
+
+  const escapeHtml = str => str.replace(/[&<>"']/g, c => `&#${c.charCodeAt(0)};`);
+
+  const now = new Date();
+  const locale = "en-US";
+  let output = "<ul>";
+
+  // Tokyo datetime header
+  const tokyoDate = new Intl.DateTimeFormat("ja-JP", {
+    calendar: 'japanese', era: 'long',
+    year: "numeric", month: "numeric", day: "numeric", weekday: "long",
+    hour: "2-digit", minute: "2-digit", hour12: false,
+    timeZone: "Asia/Tokyo"
+  }).format(now);
+  const qw = getDateInfo(now);  // quarter and ISO8601 week
+  let s = `Tokyo: (Q${qw.quarter}) (W${qw.isoWeek.toString().padStart(2, '0')}) ${tokyoDate}\n`;
+  document.getElementById("time-localClock").innerText = s;
+
+  // Time in other cities
+  cities.forEach(city => {
+    const formatter = new Intl.DateTimeFormat(locale, {
+      year: "numeric", month: "2-digit", day: "2-digit", weekday: "short",
+      hour: "2-digit", minute: "2-digit", hour12: false,
+      timeZoneName: "shortOffset",
+      timeZone: city.tz
+    })
+    const parts = formatter.formatToParts(now);
+    const t = {
+      time: parts.slice(8, -1).map(part => part.value).join('').trim(),
+      offset: parts.find(part => part.type === "timeZoneName")?.value.replace("GMT", "UTC"),
+      timeZoneName: new Intl.DateTimeFormat(locale, { timeZoneName: 'long', timeZone: city.tz })
+        .formatToParts(now).find(part => part.type === "timeZoneName")?.value,
+    }
+    t.dst = ["Daylight", "Summer"].some(sub => t.timeZoneName.includes(sub));
+    //const timeData = parts.reduce((obj, part) => { obj[part.type] = obj[part.value]; return obj; }, {})
+    const offsetAndDST = `${t.offset}` + (t.dst ? "+1" : "");
+    output += `<li>${city.name}: ${t.time} (<span title="${escapeHtml(city.note)}">${offsetAndDST}</span>) </li>`;
+  });
+  output += "</ul>"
+
+  document.getElementById("time-worldClock").innerHTML = output.trim();
+}
+
+function getQuarter(date) {
+  const month = date.getMonth(); // 0-11 (January is 0)
+  return Math.floor(month / 3) + 1; // Returns 1-4
+}
+
+function getISOWeek(date) {
+  const tempDate = new Date(date);
+  tempDate.setHours(0, 0, 0, 0);
+  tempDate.setDate(tempDate.getDate() + 3 - ((tempDate.getDay() + 6) % 7)); // Move to nearest Thursday
+  const firstThursday = new Date(tempDate.getFullYear(), 0, 4); // First Thursday of the year
+  firstThursday.setDate(firstThursday.getDate() + 3 - ((firstThursday.getDay() + 6) % 7));
+  const weekNumber = Math.round(((tempDate - firstThursday) / 86400000) / 7) + 1;
+  return weekNumber;
+}
+
+function getDateInfo(date) {
+  return {
+    quarter: getQuarter(date),
+    isoWeek: getISOWeek(date),
+    year: date.getFullYear()
+  };
 }
 
 function initTimeVisualizer(containerId) {
diff --git a/app/static/script.js b/app/static/script.js
index efd6836..84230a5 100644
--- a/app/static/script.js
+++ b/app/static/script.js
@@ -1,24 +1,22 @@
+"use strict";
 import { updateTime } from './block_time.js';
 import { updateWeather } from './block_weather.js';
 
 const config = {
-  polling: true
+  polling: true,
+  pollingDelay: 500,     // in ms.  To be light on CPU make it >= 500ms
 }
 
 function init() {
   const blocks = {
-    time: { interval: 30 * 1000, lastUpdate: 0, update: updateTime },        // 30s
+    time: { interval: 30 * 1000, lastUpdate: 0, update: updateTime },       // 30s
     weather: { interval: 30 * 60000, lastUpdate: 0, update: updateWeather } // 30min
     // Add more: { interval: X, lastUpdate: 0, update: updateFunction }
   };
 
   initHeaderControls(blocks)
-
-  // Initial load
-  // Poll every 500ms to check intervals (fast enough for 1s updates, light on CPU)
-  // maybe the 1s updates should be special case, but for now let's keep it simple
   reloadAll(blocks);
-  setInterval(() => pollUpdates(blocks), 500);
+  setInterval(() => pollUpdates(blocks), config.pollingDelay);
 }
 
 function reloadAll(blocks) {
@@ -45,6 +43,12 @@ function initHeaderControls(blocks) {
   document.getElementById("pause").addEventListener("change", (e) => {
     config.polling = e.target.checked;
   });
+  config.polling = document.getElementById("pause").checked;
+  document.getElementById("city").addEventListener("keypress", (e) => {
+    if (e.key === "Enter") {
+      updateWeather()
+    }
+  });
 }
 
 init()
diff --git a/app/static/style.css b/app/static/style.css
index a186f24..9089bc6 100644
--- a/app/static/style.css
+++ b/app/static/style.css
@@ -1,4 +1,12 @@
 /* MASU */
+/* Design decisions:
+ * * Minimum viewport resolution: 440x440px
+ * * simple is better
+ *
+ * Good and simple UI sites:
+ * * https://archlinux.org/packages/  (https://github.com/archlinux/archweb)
+ * * https://suckless.org/
+ */
 body {
     margin: 0;
     padding: 0;
@@ -47,12 +55,25 @@ header button, header label {
     }
 }
 
+/* tooltip: span element with "title" attribute (KISS) */
+span[title] {
+    /*border-bottom: 1px dotted;*/
+    text-decoration: dotted underline;
+}
+
 /* block_time */
 #time .block {
     justify-content: center;
 }
 
-#timeVisualizer .grid {
+#time-localClock {
+}
+
+#time-worldClock {
+    font-size: 12px;
+}
+
+#time-timeVisualizer .grid {
     display: grid;
     grid-template-columns: repeat(8, 42px);
     grid-template-rows: repeat(3, 42px);
@@ -63,7 +84,7 @@ header button, header label {
     margin: 0 auto;
 }
 
-#timeVisualizer .cell {
+#time-timeVisualizer .cell {
     width: 42px;
     height: 42px;
     background: #ffffff;
@@ -71,15 +92,15 @@ header button, header label {
     border: 1px solid #ddd;
 }
 
-#timeVisualizer .sleep {
+#time-timeVisualizer .sleep {
     background: #e6f3ff;
 }
 
-#timeVisualizer .past {
+#time-timeVisualizer .past {
     background: #cccccc;
 }
 
-#timeVisualizer .current::after {
+#time-timeVisualizer .current::after {
     content: '';
     position: absolute;
     left: 0;
@@ -89,7 +110,7 @@ header button, header label {
     background: #cccccc;
 }
 
-#timeVisualizer .timeline {
+#time-timeVisualizer .timeline {
     position: absolute;
     width: 2px;
     height: 100%;
diff --git a/app/templates/index.html b/app/templates/index.html
index 4647619..0d10afa 100644
--- a/app/templates/index.html
+++ b/app/templates/index.html
@@ -14,8 +14,9 @@
   <div id="container">
     <!-- TODO: Use Jinja2 blocks -->
     <div class="block" id="time">
-        <p id="weatherSummary"></p>
-        <div id="timeVisualizer"></div>
+        <div id="time-localClock"></div>
+        <div id="time-worldClock"></div>
+        <div id="time-timeVisualizer"></div>
     </div>
     <div class="block" id="weather">
       <img id="weather-icon" src="" alt="weather icon">
-- 
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