import './app.css';

import { createHashHistory } from 'history';
import { login } from 'masto';
import Router from 'preact-router';
import { useEffect, useLayoutEffect, useState } from 'preact/hooks';
import { useSnapshot } from 'valtio';

import Account from './components/account';
import Compose from './components/compose';
import Icon from './components/icon';
import Loader from './components/loader';
import Modal from './components/modal';
import Home from './pages/home';
import Login from './pages/login';
import Notifications from './pages/notifications';
import Settings from './pages/settings';
import Status from './pages/status';
import Welcome from './pages/welcome';
import { getAccessToken } from './utils/auth';
import openCompose from './utils/open-compose';
import states from './utils/states';
import store from './utils/store';

const { VITE_CLIENT_NAME: CLIENT_NAME } = import.meta.env;

window.__STATES__ = states;

async function startStream() {
  const stream = await masto.v1.stream.streamUser();
  console.log('STREAM START', { stream });
  stream.on('update', (status) => {
    console.log('UPDATE', status);

    const inHomeNew = states.homeNew.find((s) => s.id === status.id);
    const inHome = states.home.find((s) => s.id === status.id);
    if (!inHomeNew && !inHome) {
      states.homeNew.unshift({
        id: status.id,
        reblog: status.reblog?.id,
        reply: !!status.inReplyToAccountId,
      });
    }

    states.statuses.set(status.id, status);
    if (status.reblog) {
      states.statuses.set(status.reblog.id, status.reblog);
    }
  });
  stream.on('status.update', (status) => {
    console.log('STATUS.UPDATE', status);
    states.statuses.set(status.id, status);
    if (status.reblog) {
      states.statuses.set(status.reblog.id, status.reblog);
    }
  });
  stream.on('delete', (statusID) => {
    console.log('DELETE', statusID);
    // states.statuses.delete(statusID);
    const s = states.statuses.get(statusID);
    if (s) s._deleted = true;
  });
  stream.on('notification', (notification) => {
    console.log('NOTIFICATION', notification);

    const inNotificationsNew = states.notificationsNew.find(
      (n) => n.id === notification.id,
    );
    const inNotifications = states.notifications.find(
      (n) => n.id === notification.id,
    );
    if (!inNotificationsNew && !inNotifications) {
      states.notificationsNew.unshift(notification);
    }

    if (notification.status && !states.statuses.has(notification.status.id)) {
      states.statuses.set(notification.status.id, notification.status);
      if (
        notification.status.reblog &&
        !states.statuses.has(notification.status.reblog.id)
      ) {
        states.statuses.set(
          notification.status.reblog.id,
          notification.status.reblog,
        );
      }
    }
  });

  stream.ws.onclose = () => {
    console.log('STREAM CLOSED!');

    requestAnimationFrame(() => {
      startStream();
    });
  };

  return {
    stream,
    stopStream: () => {
      stream.ws.close();
    },
  };
}

function startVisibility() {
  const handleVisibilityChange = () => {
    if (document.hidden) {
      const timestamp = Date.now();
      store.session.set('lastHidden', timestamp);
    } else {
      const timestamp = Date.now();
      const lastHidden = store.session.get('lastHidden');
      const diff = timestamp - lastHidden;
      const diffMins = Math.round(diff / 1000 / 60);
      if (diffMins > 1) {
        console.log('visible', { lastHidden, diffMins });
        setTimeout(() => {
          // Buffer for WS reconnect
          (async () => {
            try {
              const fetchHome = masto.v1.timelines.listHome({
                limit: 1,
              });
              const fetchNotifications = masto.v1.notifications.list({
                limit: 1,
              });

              const newStatuses = await fetchHome;
              if (
                newStatuses.length &&
                newStatuses[0].id !== states.home[0].id
              ) {
                states.homeNew = newStatuses.map((status) => {
                  states.statuses.set(status.id, status);
                  if (status.reblog) {
                    states.statuses.set(status.reblog.id, status.reblog);
                  }
                  return {
                    id: status.id,
                    reblog: status.reblog?.id,
                    reply: !!status.inReplyToAccountId,
                  };
                });
              }

              const newNotifications = await fetchNotifications;
              if (newNotifications.length) {
                const notification = newNotifications[0];
                const inNotificationsNew = states.notificationsNew.find(
                  (n) => n.id === notification.id,
                );
                const inNotifications = states.notifications.find(
                  (n) => n.id === notification.id,
                );
                if (!inNotificationsNew && !inNotifications) {
                  states.notificationsNew.unshift(notification);
                }

                if (
                  notification.status &&
                  !states.statuses.has(notification.status.id)
                ) {
                  states.statuses.set(
                    notification.status.id,
                    notification.status,
                  );
                  if (
                    notification.status.reblog &&
                    !states.statuses.has(notification.status.reblog.id)
                  ) {
                    states.statuses.set(
                      notification.status.reblog.id,
                      notification.status.reblog,
                    );
                  }
                }
              }
            } catch (e) {
              // Silently fail
              console.error(e);
            }
          })();
        }, 100);
      }
    }
  };
  document.addEventListener('visibilitychange', handleVisibilityChange);
  return {
    stop: () => {
      document.removeEventListener('visibilitychange', handleVisibilityChange);
    },
  };
}

export function App() {
  const snapStates = useSnapshot(states);
  const [isLoggedIn, setIsLoggedIn] = useState(false);
  const [uiState, setUIState] = useState('loading');

  useLayoutEffect(() => {
    const theme = store.local.get('theme');
    if (theme) {
      document.documentElement.classList.add(`is-${theme}`);
      document
        .querySelector('meta[name="color-scheme"]')
        .setAttribute('content', theme);
    }
  }, []);

  useEffect(() => {
    const instanceURL = store.local.get('instanceURL');
    const accounts = store.local.getJSON('accounts') || [];
    const code = (window.location.search.match(/code=([^&]+)/) || [])[1];

    if (code) {
      console.log({ code });
      // Clear the code from the URL
      window.history.replaceState({}, document.title, '/');

      const clientID = store.session.get('clientID');
      const clientSecret = store.session.get('clientSecret');

      (async () => {
        setUIState('loading');
        const tokenJSON = await getAccessToken({
          instanceURL,
          client_id: clientID,
          client_secret: clientSecret,
          code,
        });
        const { access_token: accessToken } = tokenJSON;
        store.session.set('accessToken', accessToken);

        window.masto = await login({
          url: `https://${instanceURL}`,
          accessToken,
          disableVersionCheck: true,
          timeout: 30_000,
        });

        const mastoAccount = await masto.v1.accounts.verifyCredentials();

        console.log({ tokenJSON, mastoAccount });

        let account = accounts.find((a) => a.info.id === mastoAccount.id);
        if (account) {
          account.info = mastoAccount;
          account.instanceURL = instanceURL;
          account.accessToken = accessToken;
        } else {
          account = {
            info: mastoAccount,
            instanceURL,
            accessToken,
          };
          accounts.push(account);
        }

        store.local.setJSON('accounts', accounts);
        store.session.set('currentAccount', account.info.id);

        setIsLoggedIn(true);
        setUIState('default');
      })();
    } else if (accounts.length) {
      const currentAccount = store.session.get('currentAccount');
      const account =
        accounts.find((a) => a.info.id === currentAccount) || accounts[0];
      const instanceURL = account.instanceURL;
      const accessToken = account.accessToken;
      store.session.set('currentAccount', account.info.id);

      (async () => {
        try {
          setUIState('loading');
          window.masto = await login({
            url: `https://${instanceURL}`,
            accessToken,
            disableVersionCheck: true,
            timeout: 30_000,
          });
          setIsLoggedIn(true);
        } catch (e) {
          setIsLoggedIn(false);
        }
        setUIState('default');
      })();
    } else {
      setUIState('default');
    }
  }, []);

  const [currentDeck, setCurrentDeck] = useState('home');

  useEffect(() => {
    // HACK: prevent this from running again due to HMR
    if (states.init) return;

    if (isLoggedIn) {
      requestAnimationFrame(() => {
        startStream();
        startVisibility();

        // Collect instance info
        (async () => {
          const info = await masto.v2.instance.fetch();
          console.log(info);
          const { uri } = info;
          const instances = store.local.getJSON('instances') || {};
          instances[uri] = info;
          store.local.setJSON('instances', instances);
        })();
      });
      states.init = true;
    }
  }, [isLoggedIn]);

  return (
    <>
      {isLoggedIn && currentDeck && (
        <>
          <button
            type="button"
            id="compose-button"
            onClick={(e) => {
              if (e.shiftKey) {
                const newWin = openCompose();
                if (!newWin) {
                  alert('Looks like your browser is blocking popups.');
                  states.showCompose = true;
                }
              } else {
                states.showCompose = true;
              }
            }}
          >
            <Icon icon="quill" size="xxl" alt="Compose" />
          </button>
          <div class="decks">
            {/* Home will never be unmounted */}
            <Home hidden={currentDeck !== 'home'} />
            {/* Notifications can be unmounted */}
            {currentDeck === 'notifications' && <Notifications />}
          </div>
        </>
      )}
      {!isLoggedIn && uiState === 'loading' && <Loader />}
      <Router
        history={createHashHistory()}
        onChange={(e) => {
          // Special handling for Home and Notifications
          const { url } = e;
          if (/notifications/i.test(url)) {
            setCurrentDeck('notifications');
          } else if (url === '/') {
            setCurrentDeck('home');
            document.title = `Home / ${CLIENT_NAME}`;
          } else if (url === '/login' || url === '/welcome') {
            setCurrentDeck(null);
          }
          states.history.push(url);
        }}
      >
        {!isLoggedIn && uiState !== 'loading' && <Welcome path="/" />}
        <Welcome path="/welcome" />
        {isLoggedIn && <Status path="/s/:id" />}
        <Login path="/login" />
      </Router>
      {!!snapStates.showCompose && (
        <Modal>
          <Compose
            replyToStatus={
              typeof snapStates.showCompose !== 'boolean'
                ? snapStates.showCompose.replyToStatus
                : null
            }
            editStatus={states.showCompose?.editStatus || null}
            draftStatus={states.showCompose?.draftStatus || null}
            onClose={(results) => {
              const { newStatus } = results || {};
              states.showCompose = false;
              if (newStatus) {
                states.reloadStatusPage++;
              }
            }}
          />
        </Modal>
      )}
      {!!snapStates.showSettings && (
        <Modal
          onClick={(e) => {
            if (e.target === e.currentTarget) {
              states.showSettings = false;
            }
          }}
        >
          <Settings
            onClose={() => {
              states.showSettings = false;
            }}
          />
        </Modal>
      )}
      {!!snapStates.showAccount && (
        <Modal
          class="light"
          onClick={(e) => {
            if (e.target === e.currentTarget) {
              states.showAccount = false;
            }
          }}
        >
          <Account account={snapStates.showAccount} />
        </Modal>
      )}
    </>
  );
}
