email refactor

backend/services/email/core/emailUtils.js

@@ -0,0 +1,98 @@
+/**
+ * Email utility functions shared across all email services
+ */
+
+/**
+ * Convert HTML to plain text for email fallback
+ * Strips HTML tags and formats content for plain text email clients
+ * @param {string} html - HTML content to convert
+ * @returns {string} Plain text version of the HTML
+ */
+function htmlToPlainText(html) {
+  return (
+    html
+      // Remove style and script tags and their content
+      .replace(/<style[^>]*>[\s\S]*?<\/style>/gi, "")
+      .replace(/<script[^>]*>[\s\S]*?<\/script>/gi, "")
+      // Convert common HTML elements to text equivalents
+      .replace(/<br\s*\/?>/gi, "\n")
+      .replace(/<\/p>/gi, "\n\n")
+      .replace(/<\/div>/gi, "\n")
+      .replace(/<\/li>/gi, "\n")
+      .replace(/<\/h[1-6]>/gi, "\n\n")
+      .replace(/<li>/gi, "• ")
+      // Remove remaining HTML tags
+      .replace(/<[^>]+>/g, "")
+      // Decode HTML entities
+      .replace(/&nbsp;/g, " ")
+      .replace(/&amp;/g, "&")
+      .replace(/&lt;/g, "<")
+      .replace(/&gt;/g, ">")
+      .replace(/&quot;/g, '"')
+      .replace(/&#39;/g, "'")
+      // Remove emojis and special characters that don't render well in plain text
+      .replace(/[\u{1F600}-\u{1F64F}]/gu, "") // Emoticons
+      .replace(/[\u{1F300}-\u{1F5FF}]/gu, "") // Misc Symbols and Pictographs
+      .replace(/[\u{1F680}-\u{1F6FF}]/gu, "") // Transport and Map
+      .replace(/[\u{2600}-\u{26FF}]/gu, "") // Misc symbols
+      .replace(/[\u{2700}-\u{27BF}]/gu, "") // Dingbats
+      .replace(/[\u{FE00}-\u{FE0F}]/gu, "") // Variation Selectors
+      .replace(/[\u{1F900}-\u{1F9FF}]/gu, "") // Supplemental Symbols and Pictographs
+      .replace(/[\u{1FA70}-\u{1FAFF}]/gu, "") // Symbols and Pictographs Extended-A
+      // Clean up excessive whitespace
+      .replace(/\n\s*\n\s*\n/g, "\n\n")
+      .trim()
+  );
+}
+
+/**
+ * Format a date consistently for email display
+ * @param {Date|string} date - Date to format
+ * @returns {string} Formatted date string
+ */
+function formatEmailDate(date) {
+  const dateObj = typeof date === "string" ? new Date(date) : date;
+  return dateObj.toLocaleString("en-US", {
+    weekday: "long",
+    year: "numeric",
+    month: "long",
+    day: "numeric",
+    hour: "numeric",
+    minute: "2-digit",
+    hour12: true,
+  });
+}
+
+/**
+ * Format a date as a short date (no time)
+ * @param {Date|string} date - Date to format
+ * @returns {string} Formatted date string
+ */
+function formatShortDate(date) {
+  const dateObj = typeof date === "string" ? new Date(date) : date;
+  return dateObj.toLocaleString("en-US", {
+    year: "numeric",
+    month: "long",
+    day: "numeric",
+  });
+}
+
+/**
+ * Format currency for email display
+ * @param {number} amount - Amount in cents or smallest currency unit
+ * @param {string} currency - Currency code (default: USD)
+ * @returns {string} Formatted currency string
+ */
+function formatCurrency(amount, currency = "USD") {
+  return new Intl.NumberFormat("en-US", {
+    style: "currency",
+    currency: currency,
+  }).format(amount / 100);
+}
+
+module.exports = {
+  htmlToPlainText,
+  formatEmailDate,
+  formatShortDate,
+  formatCurrency,
+};