From c23164619083d1c30a7a79ad48958e7e26bee228 Mon Sep 17 00:00:00 2001
From: Thomas Ruoff <ThomasRuoff@gmail.com>
Date: Wed, 23 Sep 2020 23:56:52 +0200
Subject: [PATCH] disable selection of range over other bookings

---
 components/wizard/calendar.tsx | 16 ++++++++++++++--
 styles/index.css               | 23 ++++++++++++++++++-----
 2 files changed, 32 insertions(+), 7 deletions(-)

diff --git a/components/wizard/calendar.tsx b/components/wizard/calendar.tsx
index 620cf34..e216fa9 100644
--- a/components/wizard/calendar.tsx
+++ b/components/wizard/calendar.tsx
@@ -2,8 +2,9 @@ import React, { useContext } from 'react'
 import classnames from 'classnames'
 import { isPast, isSameDay, isAfter, isWithinInterval } from 'date-fns'
 import useSWR from 'swr'
-import Calendar, { DateCallback } from 'react-calendar'
+import Calendar from 'react-calendar'
 import { dateFormatBackend } from '../../helpers/date'
+import { getNextBigger, getNextSmaller } from '../../helpers/array'
 import { WizardContext } from './context/wizardStore'
 
 const fetcher = (path: string) => fetch(path).then((r) => r.json())
@@ -18,6 +19,10 @@ export default function MyCalendar() {
     fetcher
   )
 
+  const inSelection = !!start && !end
+  const prevBooked = inSelection && getNextSmaller(daysBooked, start)
+  const nextBooked = inSelection && getNextBigger(daysBooked, start)
+
   function tileClassName({ date, view }) {
     const isMonthView = view === 'month'
     const isDaysBookedLoaded = !!daysBooked
@@ -29,6 +34,8 @@ export default function MyCalendar() {
         isMonthView && isDaysBookedLoaded && isBooked && !isInPast,
       'react-calendar__tile--free':
         isMonthView && isDaysBookedLoaded && !isBooked && !isInPast,
+      'react-calendar__tile--selected-start': isSameDay(date, startDate),
+      'react-calendar__tile--selected-end': isSameDay(date, endDate),
       'react-calendar__tile--selected':
         (startDate &&
           isWithinInterval(date, {
@@ -36,6 +43,10 @@ export default function MyCalendar() {
             end: endDate || startDate,
           })) ||
         isSameDay(date, startDate),
+      'react-calendar__tile--unselectable':
+        inSelection &&
+        ((prevBooked && date < new Date(prevBooked)) ||
+          (nextBooked && date > new Date(nextBooked))),
     })
   }
 
@@ -62,7 +73,8 @@ export default function MyCalendar() {
 
           if (
             targetClassList.contains('react-calendar__tile--past') ||
-            targetClassList.contains('react-calendar__tile--booked')
+            targetClassList.contains('react-calendar__tile--booked') ||
+            targetClassList.contains('react-calendar__tile--unselectable')
           ) {
             return
           }
diff --git a/styles/index.css b/styles/index.css
index 51e24ac..eb47b0a 100644
--- a/styles/index.css
+++ b/styles/index.css
@@ -161,7 +161,7 @@
   @apply text-red-600;
 }
 .react-calendar__month-view__days__day--neighboringMonth {
-  @apply text-gray-400;
+  @apply text-gray-600;
 }
 .react-calendar__year-view .react-calendar__tile,
 .react-calendar__decade-view .react-calendar__tile,
@@ -169,7 +169,7 @@
 }
 
 .react-calendar__tile {
-  @apply py-1;
+  @apply py-1 border border-gray-500;
 }
 
 .react-calendar__tile--free {
@@ -177,6 +177,10 @@
   cursor: pointer;
 }
 
+.react-calendar__tile--free:hover:not(.react-calendar__tile--unselectable) {
+  @apply bg-gray-500;
+}
+
 .react-calendar__tile--booked {
   @apply bg-red-200 cursor-not-allowed;
 }
@@ -190,12 +194,21 @@
 }
 
 .react-calendar__tile--selected {
-  @apply bg-blue-200;
+  @apply bg-blue-400;
 }
 
-.react-calendar__tile--free:hover {
-  @apply bg-gray-500;
+.react-calendar__tile--unselectable {
+  @apply cursor-not-allowed;
 }
+
+.react-calendar__tile--selected-start {
+  @apply rounded-tl-sm rounded-bl-sm;
+}
+
+.react-calendar__tile--selected-end {
+  @apply rounded-tr-sm rounded-br-sm;
+}
+
 .react-calendar__tile--now {
   @apply text-green-400;
 }