From 323b0ea1282abc0945cef1ebf8185bdf9a156f5d Mon Sep 17 00:00:00 2001
From: Sebastien Castiel <sebastien@castiel.me>
Date: Tue, 9 Jan 2024 15:32:19 -0500
Subject: Feedback button

---
 src/app/groups/layout.tsx                          |  10 +-
 src/app/layout.tsx                                 |   2 +
 .../feedback-button/feedback-button-client.tsx     | 198 +++++++++++++++++++++
 .../feedback-button/feedback-button-common.tsx     |   9 +
 .../feedback-button/feedback-button-email.tsx      |  24 +++
 src/components/feedback-button/feedback-button.tsx |  27 +++
 src/components/ui/textarea.tsx                     |  24 +++
 src/components/ui/toast.tsx                        | 127 +++++++++++++
 src/components/ui/toaster.tsx                      |  35 ++++
 src/components/ui/use-toast.ts                     | 192 ++++++++++++++++++++
 src/lib/env.ts                                     |   3 +
 src/lib/resend.ts                                  |   5 +
 12 files changed, 653 insertions(+), 3 deletions(-)
 create mode 100644 src/components/feedback-button/feedback-button-client.tsx
 create mode 100644 src/components/feedback-button/feedback-button-common.tsx
 create mode 100644 src/components/feedback-button/feedback-button-email.tsx
 create mode 100644 src/components/feedback-button/feedback-button.tsx
 create mode 100644 src/components/ui/textarea.tsx
 create mode 100644 src/components/ui/toast.tsx
 create mode 100644 src/components/ui/toaster.tsx
 create mode 100644 src/components/ui/use-toast.ts
 create mode 100644 src/lib/resend.ts

(limited to 'src')

diff --git a/src/app/groups/layout.tsx b/src/app/groups/layout.tsx
index 8c221e1..dadd3a1 100644
--- a/src/app/groups/layout.tsx
+++ b/src/app/groups/layout.tsx
@@ -1,9 +1,13 @@
+import { FeedbackButton } from '@/components/feedback-button/feedback-button'
 import { PropsWithChildren } from 'react'
 
 export default function GroupsLayout({ children }: PropsWithChildren<{}>) {
   return (
-    <main className="flex-1 max-w-screen-md w-full mx-auto px-4 py-6 flex flex-col gap-6">
-      {children}
-    </main>
+    <>
+      <main className="flex-1 max-w-screen-md w-full mx-auto px-4 py-6 flex flex-col gap-6">
+        {children}
+      </main>
+      <FeedbackButton />
+    </>
   )
 }
diff --git a/src/app/layout.tsx b/src/app/layout.tsx
index c6965b9..7ffaab0 100644
--- a/src/app/layout.tsx
+++ b/src/app/layout.tsx
@@ -2,6 +2,7 @@ import { ProgressBar } from '@/components/progress-bar'
 import { ThemeProvider } from '@/components/theme-provider'
 import { ThemeToggle } from '@/components/theme-toggle'
 import { Button } from '@/components/ui/button'
+import { Toaster } from '@/components/ui/toaster'
 import { env } from '@/lib/env'
 import type { Metadata, Viewport } from 'next'
 import PlausibleProvider from 'next-plausible'
@@ -132,6 +133,7 @@ export default function RootLayout({
               </span>
             </div>
           </footer>
+          <Toaster />
         </ThemeProvider>
       </body>
     </html>
diff --git a/src/components/feedback-button/feedback-button-client.tsx b/src/components/feedback-button/feedback-button-client.tsx
new file mode 100644
index 0000000..16debec
--- /dev/null
+++ b/src/components/feedback-button/feedback-button-client.tsx
@@ -0,0 +1,198 @@
+'use client'
+import { formSchema } from '@/components/feedback-button/feedback-button-common'
+import { Button } from '@/components/ui/button'
+import {
+  Dialog,
+  DialogContent,
+  DialogDescription,
+  DialogHeader,
+  DialogTitle,
+  DialogTrigger,
+} from '@/components/ui/dialog'
+import {
+  Drawer,
+  DrawerContent,
+  DrawerDescription,
+  DrawerHeader,
+  DrawerTitle,
+  DrawerTrigger,
+} from '@/components/ui/drawer'
+import {
+  Form,
+  FormControl,
+  FormDescription,
+  FormField,
+  FormItem,
+  FormLabel,
+  FormMessage,
+} from '@/components/ui/form'
+import { Input } from '@/components/ui/input'
+import { Textarea } from '@/components/ui/textarea'
+import { useToast } from '@/components/ui/use-toast'
+import { useMediaQuery } from '@/lib/hooks'
+import { zodResolver } from '@hookform/resolvers/zod'
+import { Loader2, MessageCircle } from 'lucide-react'
+import { useState } from 'react'
+import { useForm } from 'react-hook-form'
+import * as z from 'zod'
+
+type FormValues = z.infer<typeof formSchema>
+
+type Props = {
+  sendFeedback: (values: FormValues) => Promise<void>
+}
+
+export function FeedbackButtonClient({ sendFeedback }: Props) {
+  const { toast } = useToast()
+  const isDesktop = useMediaQuery('(min-width: 768px)')
+
+  async function onSubmit(values: FormValues) {
+    await sendFeedback(values)
+    toast({
+      title: 'Thank you for your feedback!',
+      description:
+        'We will have a look at it as soon as possible, and will get back to you if needed.',
+    })
+  }
+
+  return (
+    <div className="fixed right-4 bottom-4">
+      {isDesktop ? (
+        <FeedbackDialog onSubmit={onSubmit} />
+      ) : (
+        <FeedbackDrawer onSubmit={onSubmit} />
+      )}
+    </div>
+  )
+}
+
+function FeedbackDrawer({
+  onSubmit,
+}: {
+  onSubmit: (values: FormValues) => Promise<void>
+}) {
+  const [open, setOpen] = useState(false)
+
+  return (
+    <div className="fixed right-4 bottom-4">
+      <Drawer open={open} onOpenChange={setOpen}>
+        <DrawerTrigger asChild>
+          <Button>
+            <MessageCircle className="w-4 h-4 mr-2" /> Feedback
+          </Button>
+        </DrawerTrigger>
+        <DrawerContent>
+          <DrawerHeader>
+            <DrawerTitle>Give us your feedback!</DrawerTitle>
+            <DrawerDescription>
+              We are always working to improve the user experience, and your
+              feedback helps us a lot.
+            </DrawerDescription>
+          </DrawerHeader>
+          <div className="px-4 pb-4">
+            <FeedbackForm
+              onSubmit={async (values) => {
+                await onSubmit(values)
+                setOpen(false)
+              }}
+            />
+          </div>
+        </DrawerContent>
+      </Drawer>
+    </div>
+  )
+}
+
+function FeedbackDialog({
+  onSubmit,
+}: {
+  onSubmit: (values: FormValues) => Promise<void>
+}) {
+  const [open, setOpen] = useState(false)
+
+  return (
+    <div className="fixed right-4 bottom-4">
+      <Dialog open={open} onOpenChange={setOpen}>
+        <DialogTrigger asChild>
+          <Button>
+            <MessageCircle className="w-4 h-4 mr-2" /> Feedback
+          </Button>
+        </DialogTrigger>
+        <DialogContent>
+          <DialogHeader>
+            <DialogTitle>Give us your feedback!</DialogTitle>
+            <DialogDescription>
+              We are always working to improve the user experience, and your
+              feedback helps us a lot.
+            </DialogDescription>
+          </DialogHeader>
+          <FeedbackForm
+            onSubmit={async (values) => {
+              await onSubmit(values)
+              setOpen(false)
+            }}
+          />
+        </DialogContent>
+      </Dialog>
+    </div>
+  )
+}
+
+function FeedbackForm({
+  onSubmit,
+}: {
+  onSubmit: (values: FormValues) => Promise<void>
+}) {
+  const form = useForm<FormValues>({
+    resolver: zodResolver(formSchema),
+    defaultValues: { email: '', message: '' },
+  })
+
+  const isSubmitting = form.formState.isSubmitting
+  return (
+    <Form {...form}>
+      <form onSubmit={form.handleSubmit(onSubmit)} className="grid gap-4">
+        <div className="grid gap-4">
+          <FormField
+            control={form.control}
+            name="email"
+            render={({ field }) => (
+              <FormItem>
+                <FormLabel>Your email address</FormLabel>
+                <FormControl>
+                  <Input placeholder="your@email.com" {...field} />
+                </FormControl>
+                <FormDescription>
+                  Optional. Provide it if you want us to get back to you.
+                </FormDescription>
+                <FormMessage />
+              </FormItem>
+            )}
+          />
+          <FormField
+            control={form.control}
+            name="message"
+            render={({ field }) => (
+              <FormItem>
+                <FormLabel>Your feedback</FormLabel>
+                <FormControl>
+                  <Textarea placeholder="Enter your feedback" {...field} />
+                </FormControl>
+                <FormMessage />
+              </FormItem>
+            )}
+          />
+        </div>
+        <Button type="submit" disabled={isSubmitting}>
+          {isSubmitting ? (
+            <>
+              <Loader2 className="w-4 h-4 mr-2 animate-spin" /> Submitting…
+            </>
+          ) : (
+            <>Submit</>
+          )}
+        </Button>
+      </form>
+    </Form>
+  )
+}
diff --git a/src/components/feedback-button/feedback-button-common.tsx b/src/components/feedback-button/feedback-button-common.tsx
new file mode 100644
index 0000000..04567ef
--- /dev/null
+++ b/src/components/feedback-button/feedback-button-common.tsx
@@ -0,0 +1,9 @@
+import { z } from 'zod'
+
+export const formSchema = z.object({
+  email: z.union([
+    z.string().email('Please enter a valid email address.'),
+    z.string().max(0),
+  ]),
+  message: z.string().min(10, 'Please enter at least 10 characters.').max(5000),
+})
diff --git a/src/components/feedback-button/feedback-button-email.tsx b/src/components/feedback-button/feedback-button-email.tsx
new file mode 100644
index 0000000..ecb8c7d
--- /dev/null
+++ b/src/components/feedback-button/feedback-button-email.tsx
@@ -0,0 +1,24 @@
+import { Heading } from '@react-email/heading'
+import { Html } from '@react-email/html'
+import { Preview } from '@react-email/preview'
+import { Text } from '@react-email/text'
+
+type Props = {
+  email?: string
+  message: string
+}
+
+export function FeedbackButtonEmail({ email, message }: Props) {
+  return (
+    <Html>
+      <Preview>New feedback from {email || 'anonymous user'}</Preview>
+      <Heading>New feedback on Spliit</Heading>
+      <Text>
+        Email address: <strong>{email || 'not provided'}</strong>
+      </Text>
+      <pre style={{ padding: 16, borderLeft: '2px solid lightgray' }}>
+        {message}
+      </pre>
+    </Html>
+  )
+}
diff --git a/src/components/feedback-button/feedback-button.tsx b/src/components/feedback-button/feedback-button.tsx
new file mode 100644
index 0000000..d43f8a7
--- /dev/null
+++ b/src/components/feedback-button/feedback-button.tsx
@@ -0,0 +1,27 @@
+import { FeedbackButtonClient } from '@/components/feedback-button/feedback-button-client'
+import { formSchema } from '@/components/feedback-button/feedback-button-common'
+import { FeedbackButtonEmail } from '@/components/feedback-button/feedback-button-email'
+import { env } from '@/lib/env'
+import { getResend } from '@/lib/resend'
+
+export function FeedbackButton() {
+  async function sendFeedback(values: unknown) {
+    'use server'
+    const { email, message } = formSchema.parse(values)
+    const resend = getResend()
+    if (!resend || !env.FEEDBACK_EMAIL_FROM || !env.FEEDBACK_EMAIL_TO) {
+      console.warn(
+        'Resend is not properly configured. Feedback email won’t be sent.',
+      )
+      return
+    }
+    await resend.emails.send({
+      from: env.FEEDBACK_EMAIL_FROM,
+      to: env.FEEDBACK_EMAIL_TO,
+      subject: `Spliit: new feedback from ${email || 'anonymous user'}`,
+      react: <FeedbackButtonEmail email={email} message={message} />,
+    })
+  }
+
+  return <FeedbackButtonClient sendFeedback={sendFeedback} />
+}
diff --git a/src/components/ui/textarea.tsx b/src/components/ui/textarea.tsx
new file mode 100644
index 0000000..9f9a6dc
--- /dev/null
+++ b/src/components/ui/textarea.tsx
@@ -0,0 +1,24 @@
+import * as React from "react"
+
+import { cn } from "@/lib/utils"
+
+export interface TextareaProps
+  extends React.TextareaHTMLAttributes<HTMLTextAreaElement> {}
+
+const Textarea = React.forwardRef<HTMLTextAreaElement, TextareaProps>(
+  ({ className, ...props }, ref) => {
+    return (
+      <textarea
+        className={cn(
+          "flex min-h-[80px] w-full rounded-md border border-input bg-background px-3 py-2 text-sm ring-offset-background placeholder:text-muted-foreground focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-ring focus-visible:ring-offset-2 disabled:cursor-not-allowed disabled:opacity-50",
+          className
+        )}
+        ref={ref}
+        {...props}
+      />
+    )
+  }
+)
+Textarea.displayName = "Textarea"
+
+export { Textarea }
diff --git a/src/components/ui/toast.tsx b/src/components/ui/toast.tsx
new file mode 100644
index 0000000..a822477
--- /dev/null
+++ b/src/components/ui/toast.tsx
@@ -0,0 +1,127 @@
+import * as React from "react"
+import * as ToastPrimitives from "@radix-ui/react-toast"
+import { cva, type VariantProps } from "class-variance-authority"
+import { X } from "lucide-react"
+
+import { cn } from "@/lib/utils"
+
+const ToastProvider = ToastPrimitives.Provider
+
+const ToastViewport = React.forwardRef<
+  React.ElementRef<typeof ToastPrimitives.Viewport>,
+  React.ComponentPropsWithoutRef<typeof ToastPrimitives.Viewport>
+>(({ className, ...props }, ref) => (
+  <ToastPrimitives.Viewport
+    ref={ref}
+    className={cn(
+      "fixed top-0 z-[100] flex max-h-screen w-full flex-col-reverse p-4 sm:bottom-0 sm:right-0 sm:top-auto sm:flex-col md:max-w-[420px]",
+      className
+    )}
+    {...props}
+  />
+))
+ToastViewport.displayName = ToastPrimitives.Viewport.displayName
+
+const toastVariants = cva(
+  "group pointer-events-auto relative flex w-full items-center justify-between space-x-4 overflow-hidden rounded-md border p-6 pr-8 shadow-lg transition-all data-[swipe=cancel]:translate-x-0 data-[swipe=end]:translate-x-[var(--radix-toast-swipe-end-x)] data-[swipe=move]:translate-x-[var(--radix-toast-swipe-move-x)] data-[swipe=move]:transition-none data-[state=open]:animate-in data-[state=closed]:animate-out data-[swipe=end]:animate-out data-[state=closed]:fade-out-80 data-[state=closed]:slide-out-to-right-full data-[state=open]:slide-in-from-top-full data-[state=open]:sm:slide-in-from-bottom-full",
+  {
+    variants: {
+      variant: {
+        default: "border bg-background text-foreground",
+        destructive:
+          "destructive group border-destructive bg-destructive text-destructive-foreground",
+      },
+    },
+    defaultVariants: {
+      variant: "default",
+    },
+  }
+)
+
+const Toast = React.forwardRef<
+  React.ElementRef<typeof ToastPrimitives.Root>,
+  React.ComponentPropsWithoutRef<typeof ToastPrimitives.Root> &
+    VariantProps<typeof toastVariants>
+>(({ className, variant, ...props }, ref) => {
+  return (
+    <ToastPrimitives.Root
+      ref={ref}
+      className={cn(toastVariants({ variant }), className)}
+      {...props}
+    />
+  )
+})
+Toast.displayName = ToastPrimitives.Root.displayName
+
+const ToastAction = React.forwardRef<
+  React.ElementRef<typeof ToastPrimitives.Action>,
+  React.ComponentPropsWithoutRef<typeof ToastPrimitives.Action>
+>(({ className, ...props }, ref) => (
+  <ToastPrimitives.Action
+    ref={ref}
+    className={cn(
+      "inline-flex h-8 shrink-0 items-center justify-center rounded-md border bg-transparent px-3 text-sm font-medium ring-offset-background transition-colors hover:bg-secondary focus:outline-none focus:ring-2 focus:ring-ring focus:ring-offset-2 disabled:pointer-events-none disabled:opacity-50 group-[.destructive]:border-muted/40 group-[.destructive]:hover:border-destructive/30 group-[.destructive]:hover:bg-destructive group-[.destructive]:hover:text-destructive-foreground group-[.destructive]:focus:ring-destructive",
+      className
+    )}
+    {...props}
+  />
+))
+ToastAction.displayName = ToastPrimitives.Action.displayName
+
+const ToastClose = React.forwardRef<
+  React.ElementRef<typeof ToastPrimitives.Close>,
+  React.ComponentPropsWithoutRef<typeof ToastPrimitives.Close>
+>(({ className, ...props }, ref) => (
+  <ToastPrimitives.Close
+    ref={ref}
+    className={cn(
+      "absolute right-2 top-2 rounded-md p-1 text-foreground/50 opacity-0 transition-opacity hover:text-foreground focus:opacity-100 focus:outline-none focus:ring-2 group-hover:opacity-100 group-[.destructive]:text-red-300 group-[.destructive]:hover:text-red-50 group-[.destructive]:focus:ring-red-400 group-[.destructive]:focus:ring-offset-red-600",
+      className
+    )}
+    toast-close=""
+    {...props}
+  >
+    <X className="h-4 w-4" />
+  </ToastPrimitives.Close>
+))
+ToastClose.displayName = ToastPrimitives.Close.displayName
+
+const ToastTitle = React.forwardRef<
+  React.ElementRef<typeof ToastPrimitives.Title>,
+  React.ComponentPropsWithoutRef<typeof ToastPrimitives.Title>
+>(({ className, ...props }, ref) => (
+  <ToastPrimitives.Title
+    ref={ref}
+    className={cn("text-sm font-semibold", className)}
+    {...props}
+  />
+))
+ToastTitle.displayName = ToastPrimitives.Title.displayName
+
+const ToastDescription = React.forwardRef<
+  React.ElementRef<typeof ToastPrimitives.Description>,
+  React.ComponentPropsWithoutRef<typeof ToastPrimitives.Description>
+>(({ className, ...props }, ref) => (
+  <ToastPrimitives.Description
+    ref={ref}
+    className={cn("text-sm opacity-90", className)}
+    {...props}
+  />
+))
+ToastDescription.displayName = ToastPrimitives.Description.displayName
+
+type ToastProps = React.ComponentPropsWithoutRef<typeof Toast>
+
+type ToastActionElement = React.ReactElement<typeof ToastAction>
+
+export {
+  type ToastProps,
+  type ToastActionElement,
+  ToastProvider,
+  ToastViewport,
+  Toast,
+  ToastTitle,
+  ToastDescription,
+  ToastClose,
+  ToastAction,
+}
diff --git a/src/components/ui/toaster.tsx b/src/components/ui/toaster.tsx
new file mode 100644
index 0000000..e223385
--- /dev/null
+++ b/src/components/ui/toaster.tsx
@@ -0,0 +1,35 @@
+"use client"
+
+import {
+  Toast,
+  ToastClose,
+  ToastDescription,
+  ToastProvider,
+  ToastTitle,
+  ToastViewport,
+} from "@/components/ui/toast"
+import { useToast } from "@/components/ui/use-toast"
+
+export function Toaster() {
+  const { toasts } = useToast()
+
+  return (
+    <ToastProvider>
+      {toasts.map(function ({ id, title, description, action, ...props }) {
+        return (
+          <Toast key={id} {...props}>
+            <div className="grid gap-1">
+              {title && <ToastTitle>{title}</ToastTitle>}
+              {description && (
+                <ToastDescription>{description}</ToastDescription>
+              )}
+            </div>
+            {action}
+            <ToastClose />
+          </Toast>
+        )
+      })}
+      <ToastViewport />
+    </ToastProvider>
+  )
+}
diff --git a/src/components/ui/use-toast.ts b/src/components/ui/use-toast.ts
new file mode 100644
index 0000000..1671307
--- /dev/null
+++ b/src/components/ui/use-toast.ts
@@ -0,0 +1,192 @@
+// Inspired by react-hot-toast library
+import * as React from "react"
+
+import type {
+  ToastActionElement,
+  ToastProps,
+} from "@/components/ui/toast"
+
+const TOAST_LIMIT = 1
+const TOAST_REMOVE_DELAY = 1000000
+
+type ToasterToast = ToastProps & {
+  id: string
+  title?: React.ReactNode
+  description?: React.ReactNode
+  action?: ToastActionElement
+}
+
+const actionTypes = {
+  ADD_TOAST: "ADD_TOAST",
+  UPDATE_TOAST: "UPDATE_TOAST",
+  DISMISS_TOAST: "DISMISS_TOAST",
+  REMOVE_TOAST: "REMOVE_TOAST",
+} as const
+
+let count = 0
+
+function genId() {
+  count = (count + 1) % Number.MAX_SAFE_INTEGER
+  return count.toString()
+}
+
+type ActionType = typeof actionTypes
+
+type Action =
+  | {
+      type: ActionType["ADD_TOAST"]
+      toast: ToasterToast
+    }
+  | {
+      type: ActionType["UPDATE_TOAST"]
+      toast: Partial<ToasterToast>
+    }
+  | {
+      type: ActionType["DISMISS_TOAST"]
+      toastId?: ToasterToast["id"]
+    }
+  | {
+      type: ActionType["REMOVE_TOAST"]
+      toastId?: ToasterToast["id"]
+    }
+
+interface State {
+  toasts: ToasterToast[]
+}
+
+const toastTimeouts = new Map<string, ReturnType<typeof setTimeout>>()
+
+const addToRemoveQueue = (toastId: string) => {
+  if (toastTimeouts.has(toastId)) {
+    return
+  }
+
+  const timeout = setTimeout(() => {
+    toastTimeouts.delete(toastId)
+    dispatch({
+      type: "REMOVE_TOAST",
+      toastId: toastId,
+    })
+  }, TOAST_REMOVE_DELAY)
+
+  toastTimeouts.set(toastId, timeout)
+}
+
+export const reducer = (state: State, action: Action): State => {
+  switch (action.type) {
+    case "ADD_TOAST":
+      return {
+        ...state,
+        toasts: [action.toast, ...state.toasts].slice(0, TOAST_LIMIT),
+      }
+
+    case "UPDATE_TOAST":
+      return {
+        ...state,
+        toasts: state.toasts.map((t) =>
+          t.id === action.toast.id ? { ...t, ...action.toast } : t
+        ),
+      }
+
+    case "DISMISS_TOAST": {
+      const { toastId } = action
+
+      // ! Side effects ! - This could be extracted into a dismissToast() action,
+      // but I'll keep it here for simplicity
+      if (toastId) {
+        addToRemoveQueue(toastId)
+      } else {
+        state.toasts.forEach((toast) => {
+          addToRemoveQueue(toast.id)
+        })
+      }
+
+      return {
+        ...state,
+        toasts: state.toasts.map((t) =>
+          t.id === toastId || toastId === undefined
+            ? {
+                ...t,
+                open: false,
+              }
+            : t
+        ),
+      }
+    }
+    case "REMOVE_TOAST":
+      if (action.toastId === undefined) {
+        return {
+          ...state,
+          toasts: [],
+        }
+      }
+      return {
+        ...state,
+        toasts: state.toasts.filter((t) => t.id !== action.toastId),
+      }
+  }
+}
+
+const listeners: Array<(state: State) => void> = []
+
+let memoryState: State = { toasts: [] }
+
+function dispatch(action: Action) {
+  memoryState = reducer(memoryState, action)
+  listeners.forEach((listener) => {
+    listener(memoryState)
+  })
+}
+
+type Toast = Omit<ToasterToast, "id">
+
+function toast({ ...props }: Toast) {
+  const id = genId()
+
+  const update = (props: ToasterToast) =>
+    dispatch({
+      type: "UPDATE_TOAST",
+      toast: { ...props, id },
+    })
+  const dismiss = () => dispatch({ type: "DISMISS_TOAST", toastId: id })
+
+  dispatch({
+    type: "ADD_TOAST",
+    toast: {
+      ...props,
+      id,
+      open: true,
+      onOpenChange: (open) => {
+        if (!open) dismiss()
+      },
+    },
+  })
+
+  return {
+    id: id,
+    dismiss,
+    update,
+  }
+}
+
+function useToast() {
+  const [state, setState] = React.useState<State>(memoryState)
+
+  React.useEffect(() => {
+    listeners.push(setState)
+    return () => {
+      const index = listeners.indexOf(setState)
+      if (index > -1) {
+        listeners.splice(index, 1)
+      }
+    }
+  }, [state])
+
+  return {
+    ...state,
+    toast,
+    dismiss: (toastId?: string) => dispatch({ type: "DISMISS_TOAST", toastId }),
+  }
+}
+
+export { useToast, toast }
diff --git a/src/lib/env.ts b/src/lib/env.ts
index 89648eb..ddaa553 100644
--- a/src/lib/env.ts
+++ b/src/lib/env.ts
@@ -5,6 +5,9 @@ const envSchema = z.object({
   POSTGRES_URL_NON_POOLING: z.string().url(),
   POSTGRES_PRISMA_URL: z.string().url(),
   PLAUSIBLE_DOMAIN: z.string().optional(),
+  FEEDBACK_EMAIL_FROM: z.string().email().optional(),
+  FEEDBACK_EMAIL_TO: z.string().email().optional(),
+  RESEND_API_KEY: z.string().optional(),
 })
 
 export const env = envSchema.parse(process.env)
diff --git a/src/lib/resend.ts b/src/lib/resend.ts
new file mode 100644
index 0000000..48c5fb7
--- /dev/null
+++ b/src/lib/resend.ts
@@ -0,0 +1,5 @@
+import { env } from '@/lib/env'
+import { Resend } from 'resend'
+
+export const getResend = () =>
+  env.RESEND_API_KEY ? new Resend(env.RESEND_API_KEY) : null
-- 
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