Add functionality for displaying params in email

This takes input from the user and displays it in a preview email template for sending out comms for planned maintenance and unexpected extension to planned maintenance

Author: joe-fol

packages/cli/commands/user-comms/pncMaintenance.ts

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+import fs from "fs"
+import path from "path"
+import { input, confirm } from "@inquirer/prompts"
+import nunjucks from "nunjucks"
+import { parse, format, isValid } from "date-fns"
+
+export const pncMaintenance = async () => {
+  const templateFile = "pnc-maintenance.txt"
+  const templatePath = path.join("./commands/user-comms/templates", templateFile)
+  const templateContent = fs.readFileSync(templatePath, "utf-8")
+
+  const dateInput = await input({ message: "Enter the date (dd/MM/yyyy)" })
+  const startTime = await input({ message: "Enter start time (HH:mm)" })
+  const endTime = await input({ message: "Enter end time (HH:mm)" })
+
+  const parsedDate = parse(dateInput, "dd/MM/yyyy", new Date())
+
+  if (!isValid(parsedDate)) {
+    console.error("Invalid date format. Please use 'dd/MM/yyyy' (e.g., '17/03/2025').")
+    return
+  }
+
+  const formattedDate = format(parsedDate, "EEEE d MMMM yyyy")
+
+  const renderedEmail = nunjucks.renderString(templateContent, {
+    date: formattedDate,
+    startTime: startTime,
+    endTime: endTime
+  })
+
+  console.log("\n=== Preview Email ===\n")
+  console.log(renderedEmail)
+
+  const answer = await confirm({ message: "Do you want to use this template?" })
+
+  if (!answer) {
+    process.exit(1)
+  }
+}

packages/cli/commands/user-comms/pncMaintenanceExtended.ts

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+import fs from "fs"
+import path from "path"
+import { confirm, select } from "@inquirer/prompts"
+import nunjucks from "nunjucks"
+
+export const pncMaintenanceExtended = async () => {
+  const templateFile = "pnc-maintenance-extended.txt"
+  const templatePath = path.join("./commands/user-comms/templates", templateFile)
+  const templateContent = fs.readFileSync(templatePath, "utf-8")
+
+  const extendedTimeFrameInput = await select({
+    message: "Select a time frame",
+    choices: [
+      {
+        name: "1 hour",
+        value: "1 hour",
+        description: "The extended time frame is estimated at 1 hour"
+      },
+      {
+        name: "2 hour",
+        value: "2 hour",
+        description: "The extended time frame is estimated at 2 hour"
+      }
+    ]
+  })
+
+  const renderedEmail = nunjucks.renderString(templateContent, {
+    extendedTimeFrame: extendedTimeFrameInput
+  })
+
+  console.log("\n=== Preview Email ===\n")
+  console.log(renderedEmail)
+
+  const answer = await confirm({ message: "Do you want to use this template?" })
+
+  if (!answer) {
+    process.exit(1)
+  }
+}

packages/cli/commands/user-comms/templates/pnc-maintenance-extended.txt

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+Hello {{ firstName | default("first-name") }},
+
+We regret to inform you that the PNC planned maintenance has be unexpectedly extended. 
+We have been informed that the on going work should be resolved in {{ extendedTimeFrame }}
+
+This is an estimated time, so we apologise for the inconvenience and appreciate your patience.
+We will keep you informed on any changes
+
+Thank you,
+The Bichard 7 Support team

packages/cli/commands/user-comms/templates/pnc-maintenance.txt

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+Hello {{ firstName | default("first-name") }},
+
+As a part of ongoing work to maintain and improve Bichard 7 and the PNC, there will be an impact on service during the following window:
+
+    {{ day }} {{ date }} {{ startTime }} - {{ endTime }}
+
+During this window, the PNC will be unavailable. Any messages submitted will cause an error message to be displayed and will need to be resubmitted after the change window.
+
+We apologise for the inconvenience and appreciate your patience.
+
+Thank you,
+The Bichard 7 Support team