From 288214312525e5a23d44f20c952ae9098f902b49 Mon Sep 17 00:00:00 2001
From: Michael Hunteman <michael@huntm.net>
Date: Mon, 18 Mar 2024 19:23:16 -0700
Subject: Update form based on party size

---
 src/components/RsvpForm.tsx | 84 +++++++++++++++++++++++++++++++++++++++++++--
 1 file changed, 81 insertions(+), 3 deletions(-)

diff --git a/src/components/RsvpForm.tsx b/src/components/RsvpForm.tsx
index 56d8c62..7173f32 100644
--- a/src/components/RsvpForm.tsx
+++ b/src/components/RsvpForm.tsx
@@ -9,20 +9,37 @@ import {
   RadioGroup,
   TextField,
 } from '@mui/material';
-import { useForm, Controller } from 'react-hook-form';
+import { useForm, Controller, useFieldArray } from 'react-hook-form';
 import { useOutletContext } from 'react-router-dom';
 import { useUpdateGuestMutation, Guest } from '../apiSlice';
+import { useState } from 'react';
+
+type FormValues = {
+  id: number;
+  firstName: string;
+  lastName: string;
+  attendance: string;
+  email: string;
+  partySize: number;
+  message: string;
+  partyList: {
+    firstName: string;
+    lastName: string;
+  }[];
+};
 
 function RsvpForm() {
   const [updateGuest] = useUpdateGuestMutation();
   const guest: Guest = useOutletContext();
+  const [previousPartySize, setPreviousPartySize] = useState(1);
 
   const {
     register,
     handleSubmit,
     control,
+    watch,
     formState: { errors },
-  } = useForm({
+  } = useForm<FormValues>({
     defaultValues: {
       id: guest?.id,
       firstName: guest?.firstName,
@@ -38,6 +55,34 @@ function RsvpForm() {
     updateGuest({ ...data });
   };
 
+  const { fields, append, remove } = useFieldArray({
+    control,
+    name: 'partyList',
+  });
+
+  const handleParty = () => {
+    const partySize = Number(watch('partySize'));
+    if (partySize > previousPartySize && partySize > 1 && partySize < 10) {
+      append(
+        new Array(partySize - previousPartySize).fill({
+          firstName: '',
+          lastName: '',
+        })
+      );
+      setPreviousPartySize(partySize);
+    } else if (partySize < previousPartySize && partySize > 0) {
+      remove(
+        [...Array(previousPartySize - partySize).keys()].map(
+          (_, i) => partySize + i - 1
+        )
+      );
+      setPreviousPartySize(partySize);
+    } else {
+      // TODO: use react-hook-form setError
+      console.log('error');
+    }
+  };
+
   return (
     <Container
       component="form"
@@ -47,7 +92,7 @@ function RsvpForm() {
     >
       <Grid container spacing={2} sx={{ mt: 8 }}>
         <Grid item xs={12}>
-          <p>
+          <p style={{ textAlign: 'center' }}>
             Please RSVP for the wedding by March 10, 2025. The ceremony will
             commence at 3 pm on April 26 in Divine Shepherd. The reception will
             follow at 5 pm in A Venue on the Ridge.
@@ -110,6 +155,7 @@ function RsvpForm() {
             helperText={errors.partySize?.message}
             required
             {...register('partySize', {
+              onChange: handleParty,
               required: 'This field is required',
               min: { value: 1, message: 'Please enter a positive integer' },
               max: {
@@ -129,6 +175,38 @@ function RsvpForm() {
             {...register('message')}
           />
         </Grid>
+        {fields.map((field, index) => {
+          return (
+            <Grid container item columnSpacing={2} key={field.id}>
+              <Grid item xs={12} md={6} lg={6}>
+                <TextField
+                  label="First Name"
+                  variant="outlined"
+                  fullWidth
+                  error={!!errors.partyList?.[index]?.firstName}
+                  helperText={errors.partyList?.[index]?.firstName?.message}
+                  required
+                  {...register(`partyList.${index}.firstName`, {
+                    required: 'This field is required',
+                  })}
+                />
+              </Grid>
+              <Grid item xs={12} md={6} lg={6}>
+                <TextField
+                  label="Last Name"
+                  variant="outlined"
+                  fullWidth
+                  error={!!errors.partyList?.[index]?.lastName}
+                  helperText={errors.partyList?.[index]?.lastName?.message}
+                  required
+                  {...register(`partyList.${index}.lastName`, {
+                    required: 'This field is required',
+                  })}
+                />
+              </Grid>
+            </Grid>
+          );
+        })}
         <Grid item xs={12}>
           <div
             style={{
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