From 1a8d9c529ea80828992177f0830fe2cf115f5690 Mon Sep 17 00:00:00 2001
From: Max Lynch <max@ionic.io>
Date: Wed, 30 Dec 2020 16:10:30 -0600
Subject: [PATCH] Routing shell

---
 components/AppShell.jsx       | 89 ++++++++++++++++++++---------------
 components/pages/Lists.jsx    |  7 ++-
 components/pages/Settings.jsx |  2 +-
 components/ui/Tab.jsx         | 39 ++++++++-------
 hooks/useLocation.js          | 86 +++++++++++++++++++++++++++++++++
 pages/lists.js                |  6 +++
 pages/settings.js             |  6 +++
 7 files changed, 175 insertions(+), 60 deletions(-)
 create mode 100644 hooks/useLocation.js
 create mode 100644 pages/lists.js
 create mode 100644 pages/settings.js

diff --git a/components/AppShell.jsx b/components/AppShell.jsx
index 0de06ba..ce0347f 100644
--- a/components/AppShell.jsx
+++ b/components/AppShell.jsx
@@ -1,5 +1,7 @@
+import { useCallback, useEffect, useState } from 'react';
 import { useDrag } from 'react-use-gesture';
-import { Route, Switch } from 'wouter';
+import { Router, Route, Switch, useRoute } from 'wouter';
+import { cog, cogOutline, home, homeOutline, list, listOutline } from 'ionicons/icons';
 
 import Store from '../store';
 import * as actions from '../store/actions';
@@ -16,13 +18,16 @@ import TabBar from '../components/ui/TabBar';
 import { SafeAreaProvider } from '../components/ui/SafeArea';
 import Notifications from '../components/Notifications';
 import MenuContent from '../components/MenuContent';
-import { useEffect, useState } from 'react';
 import Home from './pages/Home';
-import { cog, cogOutline, home, homeOutline, list, listOutline } from 'ionicons/icons';
+import Lists from './pages/Lists';
+import Settings from './pages/Settings';
+import useLocation from '../hooks/useLocation';
 
 const CurrentPage = ({ page }) => {
   const currentPage = Store.useState(selectors.getCurrentPage);
 
+  const [match, params] = useRoute('/lists');
+  console.log('Matches?', match);
   // const Page = currentPage.component;
   const Page = page;
 
@@ -32,19 +37,23 @@ const CurrentPage = ({ page }) => {
     setLocal(true);
   }, []);
 
+  console.log('Rendering current page', local);
+
   return (
     <PageStack>
       {local ? (
         <Switch>
           <Route path="/" component={Home} />
+          <Route path="/lists" component={Lists} />
+          <Route path="/settings" component={Settings} />
         </Switch>
       ) : (
         <Page selected={true} />
       )}
       {/*pages.map(p => {
-        const Page = p.component;
-        return <Page selected={page.id === p.id} key={p.id} />;
-      })*/}
+          const Page = p.component;
+          return <Page selected={page.id === p.id} key={p.id} />;
+        })*/}
       {/*<Page selected={true} />*/}
     </PageStack>
   );
@@ -87,39 +96,41 @@ const AppShell = ({ page }) => {
       }}
     >
       <SafeAreaProvider>
-        <Menu open={showMenu} onClose={closeMenu}>
-          <MenuContent />
-        </Menu>
-        <Nav page={currentPage} />
-        {/*<CurrentPage page={currentPage} />*/}
-        <CurrentPage page={page} />
-        <TabBar>
-          <Tab
-            icon={homeOutline}
-            selectedIcon={home}
-            title="Home"
-            onClick={() => actions.setPage(p)}
-            selected={'home' === currentPage?.id}
-          />
-          <Tab
-            icon={listOutline}
-            selectedIcon={list}
-            title="Lists"
-            onClick={() => actions.setPage(p)}
-            selected={'lists' === currentPage?.id}
-          />
-          <Tab
-            icon={cogOutline}
-            selectedIcon={cog}
-            title="settings"
-            onClick={() => actions.setPage(p)}
-            selected={'settings' === currentPage?.id}
-          />
-        </TabBar>
-        <Backdrop open={showMenu || showNotifications} onClose={backdropClose} />
-        <Modal open={showNotifications} onClose={closeNotifications}>
-          <Notifications />
-        </Modal>
+        <Router hook={useLocation}>
+          <Menu open={showMenu} onClose={closeMenu}>
+            <MenuContent />
+          </Menu>
+          <Nav page={currentPage} />
+          {/*<CurrentPage page={currentPage} />*/}
+          <CurrentPage page={page} />
+          <TabBar>
+            <Tab
+              icon={homeOutline}
+              selectedIcon={home}
+              title="Home"
+              href="/"
+              selected={'home' === currentPage?.id}
+            />
+            <Tab
+              icon={listOutline}
+              selectedIcon={list}
+              title="Lists"
+              href="/lists"
+              selected={'lists' === currentPage?.id}
+            />
+            <Tab
+              icon={cogOutline}
+              selectedIcon={cog}
+              title="settings"
+              href="/settings"
+              selected={'settings' === currentPage?.id}
+            />
+          </TabBar>
+          <Backdrop open={showMenu || showNotifications} onClose={backdropClose} />
+          <Modal open={showNotifications} onClose={closeNotifications}>
+            <Notifications />
+          </Modal>
+        </Router>
       </SafeAreaProvider>
     </App>
   );
diff --git a/components/pages/Lists.jsx b/components/pages/Lists.jsx
index 584b076..465d61c 100644
--- a/components/pages/Lists.jsx
+++ b/components/pages/Lists.jsx
@@ -7,7 +7,10 @@ import List from '../ui/List';
 import VirtualScroll from '../ui/VirtualScroll';
 
 const ListEntry = ({ list, ...props }) => (
-  <div {...props} className="p-4 border-solid dark:border-gray-800 border-b cursor-pointer dark:text-gray-200">
+  <div
+    {...props}
+    className="p-4 border-solid dark:border-gray-800 border-b cursor-pointer dark:text-gray-200"
+  >
     <span className="text-md">{list.name}</span>
   </div>
 );
@@ -29,7 +32,7 @@ const AllLists = ({ onSelect }) => {
 
 const Lists = ({ selected }) => {
   return (
-    <Content visible={selected} className="p-4 dark:bg-black">
+    <Content visible={true} className="p-4 dark:bg-black">
       <List className="h-full w-full">
         {selected && (
           <AllLists
diff --git a/components/pages/Settings.jsx b/components/pages/Settings.jsx
index 1890eed..3e3643f 100644
--- a/components/pages/Settings.jsx
+++ b/components/pages/Settings.jsx
@@ -12,7 +12,7 @@ const Settings = ({ selected }) => {
   const settings = Store.useState(selectors.getSettings);
 
   return (
-    <Content visible={selected} className="p-4 dark:bg-black">
+    <Content visible={true} className="p-4 dark:bg-black">
       <List>
         <ListItem className="flex">
           <span className="text-md flex-1 dark:text-gray-200">Enable Notifications</span>
diff --git a/components/ui/Tab.jsx b/components/ui/Tab.jsx
index c78ed0e..5775478 100644
--- a/components/ui/Tab.jsx
+++ b/components/ui/Tab.jsx
@@ -1,24 +1,27 @@
 import classNames from 'classnames';
 import Icon from './Icon';
+import { Link } from 'wouter';
 
-const Tab = ({ title, icon, selected, selectedIcon, onClick }) => (
-  <a
-    onClick={onClick}
-    href="#"
-    className={classNames('px-6 rounded-md text-sm text-center font-medium cursor-pointer', {
-      'text-gray-500 dark:text-white': !selected,
-      'text-gray-800 dark:text-gray-600': selected,
-    })}
-  >
-    {icon && (
-      <Icon
-        icon={selected ? selectedIcon : icon}
-        className="cursor-pointer"
-        style={{ fontSize: '18px' }}
-      />
-    )}
-    <label className="block cursor-pointer">{title}</label>
-  </a>
+const Tab = ({ title, href, icon, selected, selectedIcon, onClick }) => (
+  <Link href={href}>
+    <a
+      onClick={onClick}
+      href="#"
+      className={classNames('px-6 rounded-md text-sm text-center font-medium cursor-pointer', {
+        'text-gray-500 dark:text-white': !selected,
+        'text-gray-800 dark:text-gray-600': selected,
+      })}
+    >
+      {icon && (
+        <Icon
+          icon={selected ? selectedIcon : icon}
+          className="cursor-pointer"
+          style={{ fontSize: '18px' }}
+        />
+      )}
+      <label className="block cursor-pointer">{title}</label>
+    </a>
+  </Link>
 );
 
 export default Tab;
diff --git a/hooks/useLocation.js b/hooks/useLocation.js
new file mode 100644
index 0000000..a396f0d
--- /dev/null
+++ b/hooks/useLocation.js
@@ -0,0 +1,86 @@
+import { useEffect, useRef, useState, useCallback } from 'react';
+
+/**
+ * History API docs @see https://developer.mozilla.org/en-US/docs/Web/API/History
+ */
+const eventPopstate = 'popstate';
+const eventPushState = 'pushState';
+const eventReplaceState = 'replaceState';
+export const events = [eventPopstate, eventPushState, eventReplaceState];
+
+const useLocation = ({ base = '' } = {}) => {
+  const getCurrentPathname = useCallback(base => {
+    const path = typeof location === 'undefined' ? '/' : location.pathname;
+
+    return !path.toLowerCase().indexOf(base.toLowerCase())
+      ? path.slice(base.length) || '/'
+      : '~' + path;
+  }, []);
+
+  const [path, update] = useState(() => getCurrentPathname(base)); // @see https://reactjs.org/docs/hooks-reference.html#lazy-initial-state
+  const prevPath = useRef(path);
+
+  useEffect(() => {
+    // While History API does have `popstate` event, the only
+    // proper way to listen to changes via `push/replaceState`
+    // is to monkey-patch these methods.
+    //
+    // See https://stackoverflow.com/a/4585031
+    if (typeof history !== 'undefined') {
+      for (const type of [eventPushState, eventReplaceState]) {
+        const original = history[type];
+
+        history[type] = function () {
+          const result = original.apply(this, arguments);
+          const event = new Event(type);
+          event.arguments = arguments;
+
+          dispatchEvent(event);
+          return result;
+        };
+      }
+    } else {
+      console.log('No history API');
+    }
+  });
+
+  useEffect(() => {
+    // this function checks if the location has been changed since the
+    // last render and updates the state only when needed.
+    // unfortunately, we can't rely on `path` value here, since it can be stale,
+    // that's why we store the last pathname in a ref.
+    const checkForUpdates = () => {
+      const pathname = getCurrentPathname(base);
+      console.log('CHECK FOR UPDATES', pathname);
+      prevPath.current !== pathname && update((prevPath.current = pathname));
+    };
+
+    events.map(e => addEventListener(e, checkForUpdates));
+
+    // it's possible that an update has occurred between render and the effect handler,
+    // so we run additional check on mount to catch these updates. Based on:
+    // https://gist.github.com/bvaughn/e25397f70e8c65b0ae0d7c90b731b189
+    checkForUpdates();
+
+    return () => events.map(e => removeEventListener(e, checkForUpdates));
+  }, [base]);
+
+  // the 2nd argument of the `useLocation` return value is a function
+  // that allows to perform a navigation.
+  //
+  // the function reference should stay the same between re-renders, so that
+  // it can be passed down as an element prop without any performance concerns.
+  const navigate = useCallback(
+    (to, { replace = false } = {}) =>
+      history[replace ? eventReplaceState : eventPushState](
+        null,
+        '',
+        // handle nested routers and absolute paths
+        to[0] === '~' ? to.slice(1) : base + to
+      ),
+    [base]
+  );
+
+  return [path, navigate];
+};
+export default useLocation;
diff --git a/pages/lists.js b/pages/lists.js
new file mode 100644
index 0000000..cbbc0ba
--- /dev/null
+++ b/pages/lists.js
@@ -0,0 +1,6 @@
+import AppShell from '../components/AppShell';
+import ListsPage from '../components/pages/Lists';
+
+export default function Lists() {
+  return <AppShell page={ListsPage} />;
+}
diff --git a/pages/settings.js b/pages/settings.js
new file mode 100644
index 0000000..89dcf95
--- /dev/null
+++ b/pages/settings.js
@@ -0,0 +1,6 @@
+import AppShell from '../components/AppShell';
+import SettingsPage from '../components/pages/Settings';
+
+export default function Settings() {
+  return <AppShell page={SettingsPage} />;
+}