mostly working

src/server/email-templates/index.ts

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+import { readFileSync } from "fs";
+import { join } from "path";
+import { AUTH_CONFIG } from "~/config";
+
+/**
+ * Convert expiry string to human-readable format
+ * @param expiry - Expiry string like "15m", "1h", "7d"
+ * @returns Human-readable string like "15 minutes", "1 hour", "7 days"
+ */
+export function expiryToHuman(expiry: string): string {
+  const value = parseInt(expiry);
+  if (expiry.endsWith("m")) {
+    return value === 1 ? "1 minute" : `${value} minutes`;
+  } else if (expiry.endsWith("h")) {
+    return value === 1 ? "1 hour" : `${value} hours`;
+  } else if (expiry.endsWith("d")) {
+    return value === 1 ? "1 day" : `${value} days`;
+  }
+  return expiry;
+}
+
+/**
+ * Load email template from file
+ * @param templateName - Name of the template file (without .html extension)
+ * @returns Template content as string
+ */
+function loadTemplate(templateName: string): string {
+  try {
+    const templatePath = join(
+      process.cwd(),
+      "src",
+      "server",
+      "email-templates",
+      `${templateName}.html`
+    );
+    return readFileSync(templatePath, "utf-8");
+  } catch (error) {
+    console.error(`Failed to load email template: ${templateName}`, error);
+    throw new Error(`Email template not found: ${templateName}`);
+  }
+}
+
+/**
+ * Replace placeholders in template with actual values
+ * @param template - Template string with {{PLACEHOLDER}} markers
+ * @param vars - Object with placeholder values
+ * @returns Processed template string
+ */
+function processTemplate(
+  template: string,
+  vars: Record<string, string>
+): string {
+  let processed = template;
+  for (const [key, value] of Object.entries(vars)) {
+    const placeholder = `{{${key}}}`;
+    processed = processed.replaceAll(placeholder, value);
+  }
+  return processed;
+}
+
+export interface LoginLinkEmailParams {
+  email: string;
+  loginUrl: string;
+  loginCode: string;
+}
+
+/**
+ * Generate login link email HTML
+ */
+export function generateLoginLinkEmail(params: LoginLinkEmailParams): string {
+  const template = loadTemplate("login-link");
+  const expiryTime = expiryToHuman(AUTH_CONFIG.EMAIL_LOGIN_LINK_EXPIRY);
+
+  return processTemplate(template, {
+    LOGIN_URL: params.loginUrl,
+    LOGIN_CODE: params.loginCode,
+    EXPIRY_TIME: expiryTime
+  });
+}
+
+export interface PasswordResetEmailParams {
+  resetUrl: string;
+}
+
+/**
+ * Generate password reset email HTML
+ */
+export function generatePasswordResetEmail(
+  params: PasswordResetEmailParams
+): string {
+  const template = loadTemplate("password-reset");
+  const expiryTime = "1 hour"; // Password reset is hardcoded to 1 hour
+
+  return processTemplate(template, {
+    RESET_URL: params.resetUrl,
+    EXPIRY_TIME: expiryTime
+  });
+}
+
+export interface EmailVerificationParams {
+  verificationUrl: string;
+}
+
+/**
+ * Generate email verification email HTML
+ */
+export function generateEmailVerificationEmail(
+  params: EmailVerificationParams
+): string {
+  const template = loadTemplate("email-verification");
+  const expiryTime = expiryToHuman(AUTH_CONFIG.EMAIL_VERIFICATION_LINK_EXPIRY);
+
+  return processTemplate(template, {
+    VERIFICATION_URL: params.verificationUrl,
+    EXPIRY_TIME: expiryTime
+  });
+}