chore(j-s): Redirect logged in user (#16978)

* chore(j-s): Redirect logged in user

* Update Login.tsx

---------

Co-authored-by: kodiakhq[bot] <49736102+kodiakhq[bot]@users.noreply.github.com>

apps/judicial-system/web/src/routes/Shared/Login/Login.tsx

@@ -1,12 +1,27 @@
+import { useContext, useEffect } from 'react'
 import { useIntl } from 'react-intl'
 import { useRouter } from 'next/router'
 
 import { AlertMessage, Box, Button, Text } from '@island.is/island-ui/core'
+import {
+  CASES_ROUTE,
+  COURT_OF_APPEAL_CASES_ROUTE,
+  DEFENDER_CASES_ROUTE,
+  PRISON_CASES_ROUTE,
+  USERS_ROUTE,
+} from '@island.is/judicial-system/consts'
+import {
+  isCourtOfAppealsUser,
+  isDefenceUser,
+  isPrisonStaffUser,
+} from '@island.is/judicial-system/types'
 import { login, titles } from '@island.is/judicial-system-web/messages'
 import {
   PageHeader,
   PageTitle,
+  UserContext,
 } from '@island.is/judicial-system-web/src/components'
+import { UserRole } from '@island.is/judicial-system-web/src/graphql/schema'
 import { api } from '@island.is/judicial-system-web/src/services'
 import { LoginErrorCodes } from '@island.is/judicial-system-web/src/types'
 
@@ -15,6 +30,7 @@ import * as styles from './Login.css'
 const Login = () => {
   const router = useRouter()
   const { formatMessage } = useIntl()
+  const { user } = useContext(UserContext)
 
   const getErrorAlert = (errorCode: LoginErrorCodes): JSX.Element | null => {
     switch (errorCode) {
@@ -55,6 +71,22 @@ const Login = () => {
     }
   }
 
+  useEffect(() => {
+    if (user) {
+      const redirectRoute = isDefenceUser(user)
+        ? DEFENDER_CASES_ROUTE
+        : isPrisonStaffUser(user)
+        ? PRISON_CASES_ROUTE
+        : isCourtOfAppealsUser(user)
+        ? COURT_OF_APPEAL_CASES_ROUTE
+        : user.role === UserRole.ADMIN
+        ? USERS_ROUTE
+        : CASES_ROUTE
+
+      router.push(redirectRoute)
+    }
+  }, [router, user])
+
   return (
     <>
       <PageHeader title={formatMessage(titles.shared.login)} />