From 80508eb432acea4559cff7ed721cb2a370628d44 Mon Sep 17 00:00:00 2001
From: JeonDoGyun <wjsehrbs2632@naver.com>
Date: Sun, 22 Oct 2023 00:02:56 +0900
Subject: [PATCH] =?UTF-8?q?fix:=20prevMonth,=20nextMonth=20=ED=99=94?=
 =?UTF-8?q?=EB=A9=B4=20=EC=A0=84=ED=99=98=20=EC=97=90=EB=9F=AC=20=ED=95=B4?=
 =?UTF-8?q?=EA=B2=B0?=
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회색 글씨 눌렀을 때 연도가 다르면 예상했던 결과가 나오지 않는 문제 해결
---
 src/commons/MonthDays.tsx       |   6 +-
 src/pages/register/Calendar.tsx | 120 +++++++++++++++++++++-----------
 2 files changed, 82 insertions(+), 44 deletions(-)

diff --git a/src/commons/MonthDays.tsx b/src/commons/MonthDays.tsx
index d7da5b0e..28ea7ce8 100644
--- a/src/commons/MonthDays.tsx
+++ b/src/commons/MonthDays.tsx
@@ -29,16 +29,16 @@ export const CurrentMonthDays = ({
   handleClick,
 }: CurrentDaysProps) => {
   return (
-    <td key={index} className={className}>
+    <td key={index} className="flex justify-center items-center">
       <button
-        className="w-full h-full"
+        className={className}
         onClick={() => {
           const dateFormat = `${day.getFullYear()}-${String(
             day.getMonth() + 1 < 9
               ? `0${day.getMonth() + 1}`
               : day.getMonth() + 1,
           )}-${String(
-            day.getDate() + 1 < 9 ? `0${day.getDate() + 1}` : day.getDate() + 1,
+            day.getDate() < 9 ? `0${day.getDate()}` : day.getDate(),
           )}`;
           setProtectionDate((prev) => ({
             ...prev,
diff --git a/src/pages/register/Calendar.tsx b/src/pages/register/Calendar.tsx
index be572fe5..1a27cc48 100644
--- a/src/pages/register/Calendar.tsx
+++ b/src/pages/register/Calendar.tsx
@@ -1,4 +1,4 @@
-import React, { useState } from 'react';
+import React, { useEffect, useState } from 'react';
 import { useSetRecoilState } from 'recoil';
 import registerState from 'recoil/registerState';
 import {
@@ -103,31 +103,29 @@ const Calendar = ({ handleClick }: CalendarProps) => {
   };
 
   // 이전 달로 이동
-  const prevMonth = (month: number) => {
+  const prevMonth = (year: number, month: number) => {
     const prevIndex = month - 1;
-    if (prevIndex < 0) {
-      // 1월 이전은 12월로 넘어가야 됨
-      // 날짜도 변경해야 됨
+    const prevYear = currentDate.getFullYear() - 1;
+    if (prevIndex > 11 && prevYear !== year) {
       setCurrentYear((prev) => prev - 1);
-      setCurrentMonth(prevIndex + 12);
-      setCurrentDate(new Date(currentYear, prevIndex + 12));
+      setCurrentMonth((prev) => prev + 11);
+      setCurrentDate(new Date(prevYear, prevIndex + 12));
     } else {
-      setCurrentMonth(prevIndex);
-      setCurrentDate(new Date(currentYear, prevIndex)); // 시작, 끝나는 요일 정하기
+      setCurrentMonth((prev) => prev - 1);
+      setCurrentDate(new Date(currentYear, prevIndex));
     }
   };
 
   // 다음 달로 이동
-  const nextMonth = (month: number) => {
+  const nextMonth = (year: number, month: number) => {
     const nextIndex = month + 1;
-    if (nextIndex > 11) {
-      // 12월 다음은 다음 연도 1월로 넘어가야 됨
-      // 날짜도 변경해야 됨
+    const nextYear = currentDate.getFullYear() + 1;
+    if (nextIndex > 11 && nextYear !== year) {
       setCurrentYear((prev) => prev + 1);
-      setCurrentMonth(nextIndex - 12);
-      setCurrentDate(new Date(currentYear, nextIndex - 12));
+      setCurrentMonth((prev) => prev - 11);
+      setCurrentDate(new Date(nextYear, nextIndex - 12));
     } else {
-      setCurrentMonth(nextIndex);
+      setCurrentMonth((prev) => prev + 1);
       setCurrentDate(new Date(currentYear, nextIndex));
     }
   };
@@ -137,31 +135,71 @@ const Calendar = ({ handleClick }: CalendarProps) => {
     const today = new Date();
     today.setHours(0, 0, 0, 0);
 
+    // 리팩토링 필요
     return days.map((day: Date, index: number) => {
       // 지난 달에서 가져온 날짜
-      if (day.getMonth() < currentDate.getMonth()) {
-        return (
-          <PrevMonthDays
-            key={index}
-            day={day}
-            index={index}
-            className={'prevMonthDay text-gray-400 py-2'}
-            prevMonth={() => prevMonth(currentDate.getMonth())}
-          />
-        );
+      // 연도가 같을 때
+      if (day.getFullYear() === currentDate.getFullYear()) {
+        if (day.getMonth() < currentDate.getMonth()) {
+          return (
+            <PrevMonthDays
+              key={index}
+              day={day}
+              index={index}
+              className={'prevMonthDay text-gray-400 py-2'}
+              prevMonth={() =>
+                prevMonth(currentDate.getFullYear(), currentDate.getMonth())
+              }
+            />
+          );
+        }
+
+        // 다음 달에서 가져온 날짜
+        if (day.getMonth() > currentDate.getMonth()) {
+          return (
+            <NextMonthDays
+              key={index}
+              day={day}
+              index={index}
+              className={'nextMonthDay text-gray-400 py-2'}
+              nextMonth={() =>
+                nextMonth(currentDate.getFullYear(), currentDate.getMonth())
+              }
+            />
+          );
+        }
       }
 
-      // 다음 달에서 가져온 날짜
-      if (day.getMonth() > currentDate.getMonth()) {
-        return (
-          <NextMonthDays
-            key={index}
-            day={day}
-            index={index}
-            className={'nextMonthDay text-gray-400 py-2'}
-            nextMonth={() => nextMonth(currentDate.getMonth())}
-          />
-        );
+      // 연도가 다를 때
+      if (day.getFullYear() !== currentDate.getFullYear()) {
+        if (day.getMonth() < currentDate.getMonth()) {
+          return (
+            <NextMonthDays
+              key={index}
+              day={day}
+              index={index}
+              className={'nextMonthDay2 text-gray-400 py-2'}
+              nextMonth={() =>
+                nextMonth(currentDate.getFullYear(), currentDate.getMonth())
+              }
+            />
+          );
+        }
+
+        // 다음 달에서 가져온 날짜
+        if (day.getMonth() > currentDate.getMonth()) {
+          return (
+            <PrevMonthDays
+              key={index}
+              day={day}
+              index={index}
+              className={'prevMonthDay2 text-gray-400 py-2'}
+              prevMonth={() =>
+                prevMonth(currentDate.getFullYear(), currentDate.getMonth())
+              }
+            />
+          );
+        }
       }
 
       // 이번달 중 날짜가 지난 날
@@ -193,7 +231,7 @@ const Calendar = ({ handleClick }: CalendarProps) => {
             key={index}
             day={day}
             index={index}
-            className={'today bg-brand-color rounded-full text-white py-2'}
+            className={'today bg-brand-color rounded-full text-white w-8 h-8'}
             setProtectionDate={setProtectionDate}
             handleClick={handleClick}
           />
@@ -238,16 +276,16 @@ const Calendar = ({ handleClick }: CalendarProps) => {
         <div className="calendarNav-title flex flex-row justify-around p-4">
           <button
             className="calendarNav-arrow px-6"
-            onClick={() => prevMonth(currentMonth)}
+            onClick={() => prevMonth(currentDate.getFullYear(), currentMonth)}
           >
             {'<'}
           </button>
           <div className="current-month-year text-2xl font-bold">
-            {months[currentMonth]} {currentYear}
+            {months[currentDate.getMonth()]} {currentDate.getFullYear()}
           </div>
           <button
             className="calendarNav-arrow px-6"
-            onClick={() => nextMonth(currentMonth)}
+            onClick={() => nextMonth(currentDate.getFullYear(), currentMonth)}
           >
             {'>'}
           </button>