import './compose.css';

import { match } from '@formatjs/intl-localematcher';
import '@github/text-expander-element';
import equal from 'fast-deep-equal';
import { forwardRef } from 'preact/compat';
import { useEffect, useMemo, useRef, useState } from 'preact/hooks';
import { useHotkeys } from 'react-hotkeys-hook';
import stringLength from 'string-length';
import { uid } from 'uid/single';
import { useDebouncedCallback } from 'use-debounce';
import { useSnapshot } from 'valtio';

import supportedLanguages from '../data/status-supported-languages';
import urlRegex from '../data/url-regex';
import { api } from '../utils/api';
import db from '../utils/db';
import emojifyText from '../utils/emojify-text';
import openCompose from '../utils/open-compose';
import states, { saveStatus } from '../utils/states';
import store from '../utils/store';
import {
  getCurrentAccount,
  getCurrentAccountNS,
  getCurrentInstance,
} from '../utils/store-utils';
import supports from '../utils/supports';
import useInterval from '../utils/useInterval';
import visibilityIconsMap from '../utils/visibility-icons-map';

import Avatar from './avatar';
import Icon from './icon';
import Loader from './loader';
import Modal from './modal';
import Status from './status';

const supportedLanguagesMap = supportedLanguages.reduce((acc, l) => {
  const [code, common, native] = l;
  acc[code] = {
    common,
    native,
  };
  return acc;
}, {});

/* NOTES:
  - Max character limit includes BOTH status text and Content Warning text
*/

const expiryOptions = {
  '5 minutes': 5 * 60,
  '30 minutes': 30 * 60,
  '1 hour': 60 * 60,
  '6 hours': 6 * 60 * 60,
  '12 hours': 12 * 60 * 60,
  '1 day': 24 * 60 * 60,
  '3 days': 3 * 24 * 60 * 60,
  '7 days': 7 * 24 * 60 * 60,
};
const expirySeconds = Object.values(expiryOptions);
const oneDay = 24 * 60 * 60;

const expiresInFromExpiresAt = (expiresAt) => {
  if (!expiresAt) return oneDay;
  const delta = (new Date(expiresAt).getTime() - Date.now()) / 1000;
  return expirySeconds.find((s) => s >= delta) || oneDay;
};

const menu = document.createElement('ul');
menu.role = 'listbox';
menu.className = 'text-expander-menu';

// Set IntersectionObserver on menu, reposition it because text-expander doesn't handle it
const windowMargin = 16;
const observer = new IntersectionObserver((entries) => {
  entries.forEach((entry) => {
    if (entry.isIntersecting) {
      const { left, width } = entry.boundingClientRect;
      const { innerWidth } = window;
      if (left + width > innerWidth) {
        menu.style.left = innerWidth - width - windowMargin + 'px';
      }
    }
  });
});
observer.observe(menu);

const DEFAULT_LANG = match(
  [new Intl.DateTimeFormat().resolvedOptions().locale, ...navigator.languages],
  supportedLanguages.map((l) => l[0]),
  'en',
);

// https://github.com/mastodon/mastodon/blob/c4a429ed47e85a6bbf0d470a41cc2f64cf120c19/app/javascript/mastodon/features/compose/util/counter.js
const urlRegexObj = new RegExp(urlRegex.source, urlRegex.flags);
const usernameRegex = /(^|[^\/\w])@(([a-z0-9_]+)@[a-z0-9\.\-]+[a-z0-9]+)/gi;
const urlPlaceholder = '$2xxxxxxxxxxxxxxxxxxxxxxx';
function countableText(inputText) {
  return inputText
    .replace(urlRegexObj, urlPlaceholder)
    .replace(usernameRegex, '$1@$3');
}

function Compose({
  onClose,
  replyToStatus,
  editStatus,
  draftStatus,
  standalone,
  hasOpener,
}) {
  console.warn('RENDER COMPOSER');
  const { masto, instance } = api();
  const [uiState, setUIState] = useState('default');
  const UID = useRef(draftStatus?.uid || uid());
  console.log('Compose UID', UID.current);

  const currentAccount = getCurrentAccount();
  const currentAccountInfo = currentAccount.info;

  const { configuration } = getCurrentInstance();
  console.log('⚙️ Configuration', configuration);

  const {
    statuses: { maxCharacters, maxMediaAttachments, charactersReservedPerUrl },
    mediaAttachments: {
      supportedMimeTypes,
      imageSizeLimit,
      imageMatrixLimit,
      videoSizeLimit,
      videoMatrixLimit,
      videoFrameRateLimit,
    },
    polls: { maxOptions, maxCharactersPerOption, maxExpiration, minExpiration },
  } = configuration;

  const textareaRef = useRef();
  const spoilerTextRef = useRef();
  const [visibility, setVisibility] = useState('public');
  const [sensitive, setSensitive] = useState(false);
  const [language, setLanguage] = useState(
    store.session.get('currentLanguage') || DEFAULT_LANG,
  );
  const prevLanguage = useRef(language);
  const [mediaAttachments, setMediaAttachments] = useState([]);
  const [poll, setPoll] = useState(null);

  const prefs = store.account.get('preferences') || {};

  const oninputTextarea = () => {
    if (!textareaRef.current) return;
    textareaRef.current.dispatchEvent(new Event('input'));
  };
  const focusTextarea = () => {
    setTimeout(() => {
      console.debug('FOCUS textarea');
      textareaRef.current?.focus();
    }, 300);
  };

  useEffect(() => {
    if (replyToStatus) {
      const { spoilerText, visibility, language, sensitive } = replyToStatus;
      if (spoilerText && spoilerTextRef.current) {
        spoilerTextRef.current.value = spoilerText;
      }
      const mentions = new Set([
        replyToStatus.account.acct,
        ...replyToStatus.mentions.map((m) => m.acct),
      ]);
      const allMentions = [...mentions].filter(
        (m) => m !== currentAccountInfo.acct,
      );
      if (allMentions.length > 0) {
        textareaRef.current.value = `${allMentions
          .map((m) => `@${m}`)
          .join(' ')} `;
        oninputTextarea();
      }
      focusTextarea();
      setVisibility(visibility);
      setLanguage(language || prefs.postingDefaultLanguage || DEFAULT_LANG);
      setSensitive(sensitive);
    } else if (editStatus) {
      const { visibility, language, sensitive, poll, mediaAttachments } =
        editStatus;
      const composablePoll = !!poll?.options && {
        ...poll,
        options: poll.options.map((o) => o?.title || o),
        expiresIn: poll?.expiresIn || expiresInFromExpiresAt(poll.expiresAt),
      };
      setUIState('loading');
      (async () => {
        try {
          const statusSource = await masto.v1.statuses.fetchSource(
            editStatus.id,
          );
          console.log({ statusSource });
          const { text, spoilerText } = statusSource;
          textareaRef.current.value = text;
          textareaRef.current.dataset.source = text;
          oninputTextarea();
          focusTextarea();
          spoilerTextRef.current.value = spoilerText;
          setVisibility(visibility);
          setLanguage(language || presf.postingDefaultLanguage || DEFAULT_LANG);
          setSensitive(sensitive);
          setPoll(composablePoll);
          setMediaAttachments(mediaAttachments);
          setUIState('default');
        } catch (e) {
          console.error(e);
          alert(e?.reason || e);
          setUIState('error');
        }
      })();
    } else {
      focusTextarea();
      console.log('Apply prefs', prefs);
      if (prefs.postingDefaultVisibility) {
        setVisibility(prefs.postingDefaultVisibility);
      }
      if (prefs.postingDefaultLanguage) {
        setLanguage(prefs.postingDefaultLanguage);
      }
      if (prefs.postingDefaultSensitive) {
        setSensitive(prefs.postingDefaultSensitive);
      }
    }
    if (draftStatus) {
      const {
        status,
        spoilerText,
        visibility,
        language,
        sensitive,
        poll,
        mediaAttachments,
      } = draftStatus;
      const composablePoll = !!poll?.options && {
        ...poll,
        options: poll.options.map((o) => o?.title || o),
        expiresIn: poll?.expiresIn || expiresInFromExpiresAt(poll.expiresAt),
      };
      textareaRef.current.value = status;
      oninputTextarea();
      focusTextarea();
      if (spoilerText) spoilerTextRef.current.value = spoilerText;
      if (visibility) setVisibility(visibility);
      setLanguage(language || prefs.postingDefaultLanguage || DEFAULT_LANG);
      if (sensitive !== null) setSensitive(sensitive);
      if (composablePoll) setPoll(composablePoll);
      if (mediaAttachments) setMediaAttachments(mediaAttachments);
    }
  }, [draftStatus, editStatus, replyToStatus]);

  const formRef = useRef();

  const beforeUnloadCopy = 'You have unsaved changes. Discard this post?';
  const canClose = () => {
    const { value, dataset } = textareaRef.current;

    // check if loading
    if (uiState === 'loading') {
      console.log('canClose', { uiState });
      return false;
    }

    // check for status and media attachments
    const hasMediaAttachments = mediaAttachments.length > 0;
    if (!value && !hasMediaAttachments) {
      console.log('canClose', { value, mediaAttachments });
      return true;
    }

    // check if all media attachments have IDs
    const hasIDMediaAttachments =
      mediaAttachments.length > 0 &&
      mediaAttachments.every((media) => media.id);
    if (hasIDMediaAttachments) {
      console.log('canClose', { hasIDMediaAttachments });
      return true;
    }

    // check if status contains only "@acct", if replying
    const isSelf = replyToStatus?.account.id === currentAccountInfo.id;
    const hasOnlyAcct =
      replyToStatus && value.trim() === `@${replyToStatus.account.acct}`;
    // TODO: check for mentions, or maybe just generic "@username<space>", including multiple mentions like "@username1<space>@username2<space>"
    if (!isSelf && hasOnlyAcct) {
      console.log('canClose', { isSelf, hasOnlyAcct });
      return true;
    }

    // check if status is same with source
    const sameWithSource = value === dataset?.source;
    if (sameWithSource) {
      console.log('canClose', { sameWithSource });
      return true;
    }

    console.log('canClose', {
      value,
      hasMediaAttachments,
      hasIDMediaAttachments,
      poll,
      isSelf,
      hasOnlyAcct,
      sameWithSource,
      uiState,
    });

    return false;
  };

  const confirmClose = () => {
    if (!canClose()) {
      const yes = confirm(beforeUnloadCopy);
      return yes;
    }
    return true;
  };

  useEffect(() => {
    // Show warning if user tries to close window with unsaved changes
    const handleBeforeUnload = (e) => {
      if (!canClose()) {
        e.preventDefault();
        e.returnValue = beforeUnloadCopy;
      }
    };
    window.addEventListener('beforeunload', handleBeforeUnload, {
      capture: true,
    });
    return () =>
      window.removeEventListener('beforeunload', handleBeforeUnload, {
        capture: true,
      });
  }, []);

  const getCharCount = () => {
    const { value } = textareaRef.current;
    const { value: spoilerText } = spoilerTextRef.current;
    return stringLength(countableText(value)) + stringLength(spoilerText);
  };
  const updateCharCount = () => {
    const count = getCharCount();
    states.composerCharacterCount = count;
  };
  useEffect(updateCharCount, []);

  const escDownRef = useRef(false);
  useHotkeys(
    'esc',
    () => {
      escDownRef.current = true;
      // This won't be true if this event is already handled and not propagated 🤞
    },
    {
      enableOnFormTags: true,
    },
  );
  useHotkeys(
    'esc',
    () => {
      if (!standalone && escDownRef.current && confirmClose()) {
        onClose();
      }
      escDownRef.current = false;
    },
    {
      enableOnFormTags: true,
      // Use keyup because Esc keydown will close the confirm dialog on Safari
      keyup: true,
    },
  );

  const prevBackgroundDraft = useRef({});
  const draftKey = () => {
    const ns = getCurrentAccountNS();
    return `${ns}#${UID.current}`;
  };
  const saveUnsavedDraft = () => {
    // Not enabling this for editing status
    // I don't think this warrant a draft mode for a status that's already posted
    // Maybe it could be a big edit change but it should be rare
    if (editStatus) return;
    const key = draftKey();
    const backgroundDraft = {
      key,
      replyTo: replyToStatus
        ? {
            /* Smaller payload of replyToStatus. Reasons:
              - No point storing whole thing
              - Could have media attachments
              - Could be deleted/edited later
            */
            id: replyToStatus.id,
            account: {
              id: replyToStatus.account.id,
              username: replyToStatus.account.username,
              acct: replyToStatus.account.acct,
            },
          }
        : null,
      draftStatus: {
        uid: UID.current,
        status: textareaRef.current.value,
        spoilerText: spoilerTextRef.current.value,
        visibility,
        language,
        sensitive,
        poll,
        mediaAttachments,
      },
    };
    if (!equal(backgroundDraft, prevBackgroundDraft.current) && !canClose()) {
      console.debug('not equal', backgroundDraft, prevBackgroundDraft.current);
      db.drafts
        .set(key, {
          ...backgroundDraft,
          state: 'unsaved',
          updatedAt: Date.now(),
        })
        .then(() => {
          console.debug('DRAFT saved', key, backgroundDraft);
        })
        .catch((e) => {
          console.error('DRAFT failed', key, e);
        });
      prevBackgroundDraft.current = structuredClone(backgroundDraft);
    }
  };
  useInterval(saveUnsavedDraft, 5000); // background save every 5s
  useEffect(() => {
    saveUnsavedDraft();
    // If unmounted, means user discarded the draft
    // Also means pop-out 🙈, but it's okay because the pop-out will persist the ID and re-create the draft
    return () => {
      db.drafts.del(draftKey());
    };
  }, []);

  useEffect(() => {
    const handleItems = (e) => {
      const { items } = e.clipboardData || e.dataTransfer;
      const files = [];
      for (let i = 0; i < items.length; i++) {
        const item = items[i];
        if (item.kind === 'file') {
          const file = item.getAsFile();
          if (file && supportedMimeTypes.includes(file.type)) {
            files.push(file);
          }
        }
      }
      if (files.length > 0 && mediaAttachments.length >= maxMediaAttachments) {
        alert(`You can only attach up to ${maxMediaAttachments} files.`);
        return;
      }
      console.log({ files });
      if (files.length > 0) {
        e.preventDefault();
        e.stopPropagation();
        // Auto-cut-off files to avoid exceeding maxMediaAttachments
        const max = maxMediaAttachments - mediaAttachments.length;
        const allowedFiles = files.slice(0, max);
        if (allowedFiles.length <= 0) {
          alert(`You can only attach up to ${maxMediaAttachments} files.`);
          return;
        }
        const mediaFiles = allowedFiles.map((file) => ({
          file,
          type: file.type,
          size: file.size,
          url: URL.createObjectURL(file),
          id: null,
          description: null,
        }));
        setMediaAttachments([...mediaAttachments, ...mediaFiles]);
      }
    };
    window.addEventListener('paste', handleItems);
    const handleDragover = (e) => {
      // Prevent default if there's files
      if (e.dataTransfer.items.length > 0) {
        e.preventDefault();
        e.stopPropagation();
      }
    };
    window.addEventListener('dragover', handleDragover);
    window.addEventListener('drop', handleItems);
    return () => {
      window.removeEventListener('paste', handleItems);
      window.removeEventListener('dragover', handleDragover);
      window.removeEventListener('drop', handleItems);
    };
  }, [mediaAttachments]);

  const [showEmoji2Picker, setShowEmoji2Picker] = useState(false);

  return (
    <div id="compose-container-outer">
      <div id="compose-container" class={standalone ? 'standalone' : ''}>
        <div class="compose-top">
          {currentAccountInfo?.avatarStatic && (
            <Avatar
              url={currentAccountInfo.avatarStatic}
              size="xl"
              alt={currentAccountInfo.username}
              squircle={currentAccountInfo?.bot}
            />
          )}
          {!standalone ? (
            <span>
              <button
                type="button"
                class="light pop-button"
                disabled={uiState === 'loading'}
                onClick={() => {
                  // If there are non-ID media attachments (not yet uploaded), show confirmation dialog because they are not going to be passed to the new window
                  // const containNonIDMediaAttachments =
                  //   mediaAttachments.length > 0 &&
                  //   mediaAttachments.some((media) => !media.id);
                  // if (containNonIDMediaAttachments) {
                  //   const yes = confirm(
                  //     'You have media attachments that are not yet uploaded. Opening a new window will discard them and you will need to re-attach them. Are you sure you want to continue?',
                  //   );
                  //   if (!yes) {
                  //     return;
                  //   }
                  // }

                  // const mediaAttachmentsWithIDs = mediaAttachments.filter(
                  //   (media) => media.id,
                  // );

                  const newWin = openCompose({
                    editStatus,
                    replyToStatus,
                    draftStatus: {
                      uid: UID.current,
                      status: textareaRef.current.value,
                      spoilerText: spoilerTextRef.current.value,
                      visibility,
                      language,
                      sensitive,
                      poll,
                      mediaAttachments,
                    },
                  });

                  if (!newWin) {
                    alert('Looks like your browser is blocking popups.');
                    return;
                  }

                  onClose();
                }}
              >
                <Icon icon="popout" alt="Pop out" />
              </button>{' '}
              <button
                type="button"
                class="light close-button"
                disabled={uiState === 'loading'}
                onClick={() => {
                  if (confirmClose()) {
                    onClose();
                  }
                }}
              >
                <Icon icon="x" />
              </button>
            </span>
          ) : (
            hasOpener && (
              <button
                type="button"
                class="light pop-button"
                disabled={uiState === 'loading'}
                onClick={() => {
                  // If there are non-ID media attachments (not yet uploaded), show confirmation dialog because they are not going to be passed to the new window
                  // const containNonIDMediaAttachments =
                  //   mediaAttachments.length > 0 &&
                  //   mediaAttachments.some((media) => !media.id);
                  // if (containNonIDMediaAttachments) {
                  //   const yes = confirm(
                  //     'You have media attachments that are not yet uploaded. Opening a new window will discard them and you will need to re-attach them. Are you sure you want to continue?',
                  //   );
                  //   if (!yes) {
                  //     return;
                  //   }
                  // }

                  if (!window.opener) {
                    alert('Looks like you closed the parent window.');
                    return;
                  }

                  if (window.opener.__STATES__.showCompose) {
                    const yes = confirm(
                      'Looks like you already have a compose field open in the parent window. Popping in this window will discard the changes you made in the parent window. Continue?',
                    );
                    if (!yes) return;
                  }

                  // const mediaAttachmentsWithIDs = mediaAttachments.filter(
                  //   (media) => media.id,
                  // );

                  onClose({
                    fn: () => {
                      const passData = {
                        editStatus,
                        replyToStatus,
                        draftStatus: {
                          uid: UID.current,
                          status: textareaRef.current.value,
                          spoilerText: spoilerTextRef.current.value,
                          visibility,
                          language,
                          sensitive,
                          poll,
                          mediaAttachments,
                        },
                      };
                      window.opener.__COMPOSE__ = passData; // Pass it here instead of `showCompose` due to some weird proxy issue again
                      window.opener.__STATES__.showCompose = true;
                    },
                  });
                }}
              >
                <Icon icon="popin" alt="Pop in" />
              </button>
            )
          )}
        </div>
        {!!replyToStatus && (
          <div class="status-preview">
            <Status status={replyToStatus} size="s" previewMode />
            <div class="status-preview-legend reply-to">
              Replying to @
              {replyToStatus.account.acct || replyToStatus.account.username}
              &rsquo;s status
            </div>
          </div>
        )}
        {!!editStatus && (
          <div class="status-preview">
            <Status status={editStatus} size="s" previewMode />
            <div class="status-preview-legend">Editing source status</div>
          </div>
        )}
        <form
          ref={formRef}
          class={`form-visibility-${visibility}`}
          style={{
            pointerEvents: uiState === 'loading' ? 'none' : 'auto',
            opacity: uiState === 'loading' ? 0.5 : 1,
          }}
          onKeyDown={(e) => {
            if (e.key === 'Enter' && (e.ctrlKey || e.metaKey)) {
              formRef.current.dispatchEvent(
                new Event('submit', { cancelable: true }),
              );
            }
          }}
          onSubmit={(e) => {
            e.preventDefault();

            const formData = new FormData(e.target);
            const entries = Object.fromEntries(formData.entries());
            console.log('ENTRIES', entries);
            let { status, visibility, sensitive, spoilerText } = entries;

            // Pre-cleanup
            sensitive = sensitive === 'on'; // checkboxes return "on" if checked

            // Validation
            /* Let the backend validate this
          if (stringLength(status) > maxCharacters) {
            alert(`Status is too long! Max characters: ${maxCharacters}`);
            return;
          }
          if (
            sensitive &&
            stringLength(status) + stringLength(spoilerText) > maxCharacters
          ) {
            alert(
              `Status and content warning is too long! Max characters: ${maxCharacters}`,
            );
            return;
          }
          */
            if (poll) {
              if (poll.options.length < 2) {
                alert('Poll must have at least 2 options');
                return;
              }
              if (poll.options.some((option) => option === '')) {
                alert('Some poll choices are empty');
                return;
              }
            }
            // TODO: check for URLs and use `charactersReservedPerUrl` to calculate max characters

            if (mediaAttachments.length > 0) {
              // If there are media attachments, check if they have no descriptions
              const hasNoDescriptions = mediaAttachments.some(
                (media) => !media.description?.trim?.(),
              );
              if (hasNoDescriptions) {
                const yes = confirm(
                  'Some media have no descriptions. Continue?',
                );
                if (!yes) return;
              }
            }

            // Post-cleanup
            spoilerText = (sensitive && spoilerText) || undefined;
            status = status === '' ? undefined : status;

            setUIState('loading');
            (async () => {
              try {
                console.log('MEDIA ATTACHMENTS', mediaAttachments);
                if (mediaAttachments.length > 0) {
                  // Upload media attachments first
                  const mediaPromises = mediaAttachments.map((attachment) => {
                    const { file, description, id } = attachment;
                    console.log('UPLOADING', attachment);
                    if (id) {
                      // If already uploaded
                      return attachment;
                    } else {
                      const params = removeNullUndefined({
                        file,
                        description,
                      });
                      return masto.v2.mediaAttachments
                        .create(params)
                        .then((res) => {
                          if (res.id) {
                            attachment.id = res.id;
                          }
                          return res;
                        });
                    }
                  });
                  const results = await Promise.allSettled(mediaPromises);

                  // If any failed, return
                  if (
                    results.some((result) => {
                      return result.status === 'rejected' || !result.value?.id;
                    })
                  ) {
                    setUIState('error');
                    // Alert all the reasons
                    results.forEach((result) => {
                      if (result.status === 'rejected') {
                        console.error(result);
                        alert(result.reason || `Attachment #${i} failed`);
                      }
                    });
                    return;
                  }

                  console.log({ results, mediaAttachments });
                }

                /* NOTE:
                Using snakecase here because masto.js's `isObject` returns false for `params`, ONLY happens when opening in pop-out window. This is maybe due to `window.masto` variable being passed from the parent window. The check that failed is `x.constructor === Object`, so maybe the `Object` in new window is different than parent window's?
                Code: https://github.com/neet/masto.js/blob/dd0d649067b6a2b6e60fbb0a96597c373a255b00/src/serializers/is-object.ts#L2
              */
                let params = {
                  status,
                  // spoilerText,
                  spoiler_text: spoilerText,
                  language,
                  sensitive,
                  poll,
                  // mediaIds: mediaAttachments.map((attachment) => attachment.id),
                  media_ids: mediaAttachments.map(
                    (attachment) => attachment.id,
                  ),
                };
                if (editStatus && supports('@mastodon/edit-media-attributes')) {
                  params.media_attributes = mediaAttachments.map(
                    (attachment) => {
                      return {
                        id: attachment.id,
                        description: attachment.description,
                        // focus
                        // thumbnail
                      };
                    },
                  );
                } else if (!editStatus) {
                  params.visibility = visibility;
                  // params.inReplyToId = replyToStatus?.id || undefined;
                  params.in_reply_to_id = replyToStatus?.id || undefined;
                }
                params = removeNullUndefined(params);
                console.log('POST', params);

                let newStatus;
                if (editStatus) {
                  newStatus = await masto.v1.statuses.update(
                    editStatus.id,
                    params,
                  );
                  saveStatus(newStatus, instance, {
                    skipThreading: true,
                  });
                } else {
                  newStatus = await masto.v1.statuses.create(params, {
                    idempotencyKey: UID.current,
                  });
                }
                setUIState('default');

                // Close
                onClose({
                  newStatus,
                  instance,
                });
              } catch (e) {
                console.error(e);
                alert(e?.reason || e);
                setUIState('error');
              }
            })();
          }}
        >
          <div class="toolbar stretch">
            <input
              ref={spoilerTextRef}
              type="text"
              name="spoilerText"
              placeholder="Content warning"
              disabled={uiState === 'loading'}
              class="spoiler-text-field"
              lang={language}
              spellCheck="true"
              style={{
                opacity: sensitive ? 1 : 0,
                pointerEvents: sensitive ? 'auto' : 'none',
              }}
              onInput={() => {
                updateCharCount();
              }}
            />
            <label
              class={`toolbar-button ${sensitive ? 'highlight' : ''}`}
              title="Content warning or sensitive media"
            >
              <input
                name="sensitive"
                type="checkbox"
                checked={sensitive}
                disabled={uiState === 'loading'}
                onChange={(e) => {
                  const sensitive = e.target.checked;
                  setSensitive(sensitive);
                  if (sensitive) {
                    spoilerTextRef.current?.focus();
                  } else {
                    textareaRef.current?.focus();
                  }
                }}
              />
              <Icon icon={`eye-${sensitive ? 'close' : 'open'}`} />
            </label>{' '}
            <label
              class={`toolbar-button ${
                visibility !== 'public' && !sensitive ? 'show-field' : ''
              } ${visibility !== 'public' ? 'highlight' : ''}`}
              title={`Visibility: ${visibility}`}
            >
              <Icon icon={visibilityIconsMap[visibility]} alt={visibility} />
              <select
                name="visibility"
                value={visibility}
                onChange={(e) => {
                  setVisibility(e.target.value);
                }}
                disabled={uiState === 'loading' || !!editStatus}
              >
                <option value="public">
                  Public <Icon icon="earth" />
                </option>
                <option value="unlisted">Unlisted</option>
                <option value="private">Followers only</option>
                <option value="direct">Private mention</option>
              </select>
            </label>{' '}
          </div>
          <Textarea
            ref={textareaRef}
            placeholder={
              replyToStatus
                ? 'Post your reply'
                : editStatus
                ? 'Edit your status'
                : 'What are you doing?'
            }
            required={mediaAttachments?.length === 0}
            disabled={uiState === 'loading'}
            lang={language}
            onInput={() => {
              updateCharCount();
            }}
            maxCharacters={maxCharacters}
            performSearch={(params) => {
              return masto.v2.search(params);
            }}
          />
          {mediaAttachments?.length > 0 && (
            <div class="media-attachments">
              {mediaAttachments.map((attachment, i) => {
                const { id, file } = attachment;
                const fileID = file?.size + file?.type + file?.name;
                return (
                  <MediaAttachment
                    key={id || fileID || i}
                    attachment={attachment}
                    disabled={uiState === 'loading'}
                    lang={language}
                    onDescriptionChange={(value) => {
                      setMediaAttachments((attachments) => {
                        const newAttachments = [...attachments];
                        newAttachments[i].description = value;
                        return newAttachments;
                      });
                    }}
                    onRemove={() => {
                      setMediaAttachments((attachments) => {
                        return attachments.filter((_, j) => j !== i);
                      });
                    }}
                  />
                );
              })}
              <label class="media-sensitive">
                <input
                  name="sensitive"
                  type="checkbox"
                  checked={sensitive}
                  disabled={uiState === 'loading'}
                  onChange={(e) => {
                    const sensitive = e.target.checked;
                    setSensitive(sensitive);
                  }}
                />{' '}
                <span>Mark media as sensitive</span>{' '}
                <Icon icon={`eye-${sensitive ? 'close' : 'open'}`} />
              </label>
            </div>
          )}
          {!!poll && (
            <Poll
              lang={language}
              maxOptions={maxOptions}
              maxExpiration={maxExpiration}
              minExpiration={minExpiration}
              maxCharactersPerOption={maxCharactersPerOption}
              poll={poll}
              disabled={uiState === 'loading'}
              onInput={(poll) => {
                if (poll) {
                  const newPoll = { ...poll };
                  setPoll(newPoll);
                } else {
                  setPoll(null);
                }
              }}
            />
          )}
          <div
            class="toolbar wrap"
            style={{
              justifyContent: 'flex-end',
            }}
          >
            <span>
              <label class="toolbar-button">
                <input
                  type="file"
                  accept={supportedMimeTypes.join(',')}
                  multiple={mediaAttachments.length < maxMediaAttachments - 1}
                  disabled={
                    uiState === 'loading' ||
                    mediaAttachments.length >= maxMediaAttachments ||
                    !!poll
                  }
                  onChange={(e) => {
                    const files = e.target.files;
                    if (!files) return;

                    const mediaFiles = Array.from(files).map((file) => ({
                      file,
                      type: file.type,
                      size: file.size,
                      url: URL.createObjectURL(file),
                      id: null, // indicate uploaded state
                      description: null,
                    }));
                    console.log('MEDIA ATTACHMENTS', files, mediaFiles);

                    // Validate max media attachments
                    if (
                      mediaAttachments.length + mediaFiles.length >
                      maxMediaAttachments
                    ) {
                      alert(
                        `You can only attach up to ${maxMediaAttachments} files.`,
                      );
                    } else {
                      setMediaAttachments((attachments) => {
                        return attachments.concat(mediaFiles);
                      });
                    }
                    // Reset
                    e.target.value = '';
                  }}
                />
                <Icon icon="attachment" />
              </label>{' '}
              <button
                type="button"
                class="toolbar-button"
                disabled={
                  uiState === 'loading' || !!poll || !!mediaAttachments.length
                }
                onClick={() => {
                  setPoll({
                    options: ['', ''],
                    expiresIn: 24 * 60 * 60, // 1 day
                    multiple: false,
                  });
                }}
              >
                <Icon icon="poll" alt="Add poll" />
              </button>{' '}
              <button
                type="button"
                class="toolbar-button"
                disabled={uiState === 'loading'}
                onClick={() => {
                  setShowEmoji2Picker(true);
                }}
              >
                <Icon icon="emoji2" />
              </button>
            </span>
            <div class="spacer" />
            {uiState === 'loading' ? (
              <Loader abrupt />
            ) : (
              <CharCountMeter
                maxCharacters={maxCharacters}
                hidden={uiState === 'loading'}
              />
            )}
            <label
              class={`toolbar-button ${
                language !== prevLanguage.current ? 'highlight' : ''
              }`}
            >
              <span class="icon-text">
                {supportedLanguagesMap[language]?.native}
              </span>
              <select
                name="language"
                value={language}
                onChange={(e) => {
                  const { value } = e.target;
                  setLanguage(value || DEFAULT_LANG);
                  store.session.set('currentLanguage', value || DEFAULT_LANG);
                }}
                disabled={uiState === 'loading'}
              >
                {supportedLanguages
                  .sort(([, commonA], [, commonB]) => {
                    return commonA.localeCompare(commonB);
                  })
                  .map(([code, common, native]) => (
                    <option value={code}>
                      {common} ({native})
                    </option>
                  ))}
              </select>
            </label>{' '}
            <button
              type="submit"
              class="large"
              disabled={uiState === 'loading'}
            >
              {replyToStatus ? 'Reply' : editStatus ? 'Update' : 'Post'}
            </button>
          </div>
        </form>
      </div>
      {showEmoji2Picker && (
        <Modal
          class="light"
          onClick={(e) => {
            if (e.target === e.currentTarget) {
              setShowEmoji2Picker(false);
            }
          }}
        >
          <CustomEmojisModal
            masto={masto}
            instance={instance}
            onClose={() => {
              setShowEmoji2Picker(false);
            }}
            onSelect={(emoji) => {
              const emojiWithSpace = ` ${emoji} `;
              const textarea = textareaRef.current;
              if (!textarea) return;
              const { selectionStart, selectionEnd } = textarea;
              const text = textarea.value;
              const newText =
                text.slice(0, selectionStart) +
                emojiWithSpace +
                text.slice(selectionEnd);
              textarea.value = newText;
              textarea.selectionStart = textarea.selectionEnd =
                selectionEnd + emojiWithSpace.length;
              textarea.focus();
              textarea.dispatchEvent(new Event('input'));
            }}
          />
        </Modal>
      )}
    </div>
  );
}

const Textarea = forwardRef((props, ref) => {
  const { masto } = api();
  const [text, setText] = useState(ref.current?.value || '');
  const { maxCharacters, performSearch = () => {}, ...textareaProps } = props;
  const snapStates = useSnapshot(states);
  const charCount = snapStates.composerCharacterCount;

  const customEmojis = useRef();
  useEffect(() => {
    (async () => {
      try {
        const emojis = await masto.v1.customEmojis.list();
        console.log({ emojis });
        customEmojis.current = emojis;
      } catch (e) {
        // silent fail
        console.error(e);
      }
    })();
  }, []);

  const textExpanderRef = useRef();
  const textExpanderTextRef = useRef('');
  useEffect(() => {
    let handleChange, handleValue, handleCommited;
    if (textExpanderRef.current) {
      handleChange = (e) => {
        // console.log('text-expander-change', e);
        const { key, provide, text } = e.detail;
        textExpanderTextRef.current = text;

        if (text === '') {
          provide(
            Promise.resolve({
              matched: false,
            }),
          );
          return;
        }

        if (key === ':') {
          // const emojis = customEmojis.current.filter((emoji) =>
          //   emoji.shortcode.startsWith(text),
          // );
          const emojis = filterShortcodes(customEmojis.current, text);
          let html = '';
          emojis.forEach((emoji) => {
            const { shortcode, url } = emoji;
            html += `
                <li role="option" data-value="${encodeHTML(shortcode)}">
                <img src="${encodeHTML(
                  url,
                )}" width="16" height="16" alt="" loading="lazy" /> 
                :${encodeHTML(shortcode)}:
              </li>`;
          });
          // console.log({ emojis, html });
          menu.innerHTML = html;
          provide(
            Promise.resolve({
              matched: emojis.length > 0,
              fragment: menu,
            }),
          );
          return;
        }

        const type = {
          '@': 'accounts',
          '#': 'hashtags',
        }[key];
        provide(
          new Promise((resolve) => {
            const searchResults = performSearch({
              type,
              q: text,
              limit: 5,
            });
            searchResults.then((value) => {
              if (text !== textExpanderTextRef.current) {
                return;
              }
              console.log({ value, type, v: value[type] });
              const results = value[type];
              console.log('RESULTS', value, results);
              let html = '';
              results.forEach((result) => {
                const {
                  name,
                  avatarStatic,
                  displayName,
                  username,
                  acct,
                  emojis,
                } = result;
                const displayNameWithEmoji = emojifyText(displayName, emojis);
                // const item = menuItem.cloneNode();
                if (acct) {
                  html += `
                    <li role="option" data-value="${encodeHTML(acct)}">
                      <span class="avatar">
                        <img src="${encodeHTML(
                          avatarStatic,
                        )}" width="16" height="16" alt="" loading="lazy" />
                      </span>
                      <span>
                        <b>${displayNameWithEmoji || username}</b>
                        <br>@${encodeHTML(acct)}
                      </span>
                    </li>
                  `;
                } else {
                  html += `
                    <li role="option" data-value="${encodeHTML(name)}">
                      <span>#<b>${encodeHTML(name)}</b></span>
                    </li>
                  `;
                }
                menu.innerHTML = html;
              });
              console.log('MENU', results, menu);
              resolve({
                matched: results.length > 0,
                fragment: menu,
              });
            });
          }),
        );
      };

      textExpanderRef.current.addEventListener(
        'text-expander-change',
        handleChange,
      );

      handleValue = (e) => {
        const { key, item } = e.detail;
        if (key === ':') {
          e.detail.value = `:${item.dataset.value}:`;
        } else {
          e.detail.value = `${key}${item.dataset.value}`;
        }
      };

      textExpanderRef.current.addEventListener(
        'text-expander-value',
        handleValue,
      );

      handleCommited = (e) => {
        const { input } = e.detail;
        setText(input.value);
      };

      textExpanderRef.current.addEventListener(
        'text-expander-committed',
        handleCommited,
      );
    }

    return () => {
      if (textExpanderRef.current) {
        textExpanderRef.current.removeEventListener(
          'text-expander-change',
          handleChange,
        );
        textExpanderRef.current.removeEventListener(
          'text-expander-value',
          handleValue,
        );
        textExpanderRef.current.removeEventListener(
          'text-expander-committed',
          handleCommited,
        );
      }
    };
  }, []);

  return (
    <text-expander ref={textExpanderRef} keys="@ # :">
      <textarea
        autoCapitalize="sentences"
        autoComplete="on"
        autoCorrect="on"
        spellCheck="true"
        dir="auto"
        rows="6"
        cols="50"
        {...textareaProps}
        ref={ref}
        name="status"
        value={text}
        onInput={(e) => {
          const { scrollHeight, offsetHeight, clientHeight, value } = e.target;
          setText(value);
          const offset = offsetHeight - clientHeight;
          e.target.style.height = value ? scrollHeight + offset + 'px' : null;
          props.onInput?.(e);
        }}
        style={{
          width: '100%',
          height: '4em',
          '--text-weight': (1 + charCount / 140).toFixed(1) || 1,
        }}
      />
    </text-expander>
  );
});

function CharCountMeter({ maxCharacters = 500, hidden }) {
  const snapStates = useSnapshot(states);
  const charCount = snapStates.composerCharacterCount;
  const leftChars = maxCharacters - charCount;
  if (charCount <= maxCharacters / 2 || hidden) {
    return <meter class="donut" hidden />;
  }
  return (
    <meter
      class={`donut ${
        leftChars <= -10
          ? 'explode'
          : leftChars <= 0
          ? 'danger'
          : leftChars <= 20
          ? 'warning'
          : ''
      }`}
      value={charCount}
      max={maxCharacters}
      data-left={leftChars}
      style={{
        '--percentage': (charCount / maxCharacters) * 100,
      }}
    />
  );
}

function MediaAttachment({
  attachment,
  disabled,
  lang,
  onDescriptionChange = () => {},
  onRemove = () => {},
}) {
  const supportsEdit = supports('@mastodon/edit-media-attributes');
  const { url, type, id } = attachment;
  console.log({ attachment });
  const [description, setDescription] = useState(attachment.description);
  const suffixType = type.split('/')[0];
  const debouncedOnDescriptionChange = useDebouncedCallback(
    onDescriptionChange,
    500,
  );

  const [showModal, setShowModal] = useState(false);
  const textareaRef = useRef(null);
  useEffect(() => {
    let timer;
    if (showModal && textareaRef.current) {
      timer = setTimeout(() => {
        textareaRef.current.focus();
      }, 100);
    }
    return () => {
      clearTimeout(timer);
    };
  }, [showModal]);

  const descTextarea = (
    <>
      {!!id && !supportsEdit ? (
        <div class="media-desc">
          <span class="tag">Uploaded</span>
          <p title={description}>
            {attachment.description || <i>No description</i>}
          </p>
        </div>
      ) : (
        <textarea
          ref={textareaRef}
          value={description || ''}
          lang={lang}
          placeholder={
            {
              image: 'Image description',
              video: 'Video description',
              audio: 'Audio description',
            }[suffixType]
          }
          autoCapitalize="sentences"
          autoComplete="on"
          autoCorrect="on"
          spellCheck="true"
          dir="auto"
          disabled={disabled}
          maxlength="1500" // Not unicode-aware :(
          // TODO: Un-hard-code this maxlength, ref: https://github.com/mastodon/mastodon/blob/b59fb28e90bc21d6fd1a6bafd13cfbd81ab5be54/app/models/media_attachment.rb#L39
          onInput={(e) => {
            const { value } = e.target;
            setDescription(value);
            debouncedOnDescriptionChange(value);
          }}
        ></textarea>
      )}
    </>
  );

  return (
    <>
      <div class="media-attachment">
        <div
          class="media-preview"
          onClick={() => {
            setShowModal(true);
          }}
        >
          {suffixType === 'image' ? (
            <img src={url} alt="" />
          ) : suffixType === 'video' || suffixType === 'gifv' ? (
            <video src={url} playsinline muted />
          ) : suffixType === 'audio' ? (
            <audio src={url} controls />
          ) : null}
        </div>
        {descTextarea}
        <div class="media-aside">
          <button
            type="button"
            class="plain close-button"
            disabled={disabled}
            onClick={onRemove}
          >
            <Icon icon="x" />
          </button>
        </div>
      </div>
      {showModal && (
        <Modal
          onClick={(e) => {
            if (e.target === e.currentTarget) {
              setShowModal(false);
            }
          }}
        >
          <div id="media-sheet" class="sheet sheet-max">
            <header>
              <h2>
                {
                  {
                    image: 'Edit image description',
                    video: 'Edit video description',
                    audio: 'Edit audio description',
                  }[suffixType]
                }
              </h2>
            </header>
            <main tabIndex="-1">
              <div class="media-preview">
                {suffixType === 'image' ? (
                  <img src={url} alt="" />
                ) : suffixType === 'video' || suffixType === 'gifv' ? (
                  <video src={url} playsinline controls />
                ) : suffixType === 'audio' ? (
                  <audio src={url} controls />
                ) : null}
              </div>
              {descTextarea}
            </main>
          </div>
        </Modal>
      )}
    </>
  );
}

function Poll({
  lang,
  poll,
  disabled,
  onInput = () => {},
  maxOptions,
  maxExpiration,
  minExpiration,
  maxCharactersPerOption,
}) {
  const { options, expiresIn, multiple } = poll;

  return (
    <div class={`poll ${multiple ? 'multiple' : ''}`}>
      <div class="poll-choices">
        {options.map((option, i) => (
          <div class="poll-choice" key={i}>
            <input
              required
              type="text"
              value={option}
              disabled={disabled}
              maxlength={maxCharactersPerOption}
              placeholder={`Choice ${i + 1}`}
              lang={lang}
              spellCheck="true"
              onInput={(e) => {
                const { value } = e.target;
                options[i] = value;
                onInput(poll);
              }}
            />
            <button
              type="button"
              class="plain2 poll-button"
              disabled={disabled || options.length <= 1}
              onClick={() => {
                options.splice(i, 1);
                onInput(poll);
              }}
            >
              <Icon icon="x" size="s" />
            </button>
          </div>
        ))}
      </div>
      <div class="poll-toolbar">
        <button
          type="button"
          class="plain2 poll-button"
          disabled={disabled || options.length >= maxOptions}
          onClick={() => {
            options.push('');
            onInput(poll);
          }}
        >
          +
        </button>{' '}
        <label class="multiple-choices">
          <input
            type="checkbox"
            checked={multiple}
            disabled={disabled}
            onChange={(e) => {
              const { checked } = e.target;
              poll.multiple = checked;
              onInput(poll);
            }}
          />{' '}
          Multiple choices
        </label>
        <label class="expires-in">
          Duration{' '}
          <select
            value={expiresIn}
            disabled={disabled}
            onChange={(e) => {
              const { value } = e.target;
              poll.expiresIn = value;
              onInput(poll);
            }}
          >
            {Object.entries(expiryOptions)
              .filter(([label, value]) => {
                return value >= minExpiration && value <= maxExpiration;
              })
              .map(([label, value]) => (
                <option value={value} key={value}>
                  {label}
                </option>
              ))}
          </select>
        </label>
      </div>
      <div class="poll-toolbar">
        <button
          type="button"
          class="plain remove-poll-button"
          disabled={disabled}
          onClick={() => {
            onInput(null);
          }}
        >
          Remove poll
        </button>
      </div>
    </div>
  );
}

function filterShortcodes(emojis, searchTerm) {
  searchTerm = searchTerm.toLowerCase();

  // Return an array of shortcodes that start with or contain the search term, sorted by relevance and limited to the first 5
  return emojis
    .sort((a, b) => {
      let aLower = a.shortcode.toLowerCase();
      let bLower = b.shortcode.toLowerCase();

      let aStartsWith = aLower.startsWith(searchTerm);
      let bStartsWith = bLower.startsWith(searchTerm);
      let aContains = aLower.includes(searchTerm);
      let bContains = bLower.includes(searchTerm);
      let bothStartWith = aStartsWith && bStartsWith;
      let bothContain = aContains && bContains;

      return bothStartWith
        ? a.length - b.length
        : aStartsWith
        ? -1
        : bStartsWith
        ? 1
        : bothContain
        ? a.length - b.length
        : aContains
        ? -1
        : bContains
        ? 1
        : 0;
    })
    .slice(0, 5);
}

function encodeHTML(str) {
  return str.replace(/[&<>"']/g, function (char) {
    return '&#' + char.charCodeAt(0) + ';';
  });
}

function removeNullUndefined(obj) {
  for (let key in obj) {
    if (obj[key] === null || obj[key] === undefined) {
      delete obj[key];
    }
  }
  return obj;
}

function CustomEmojisModal({
  masto,
  instance,
  onClose = () => {},
  onSelect = () => {},
}) {
  const [uiState, setUIState] = useState('default');
  const customEmojisList = useRef([]);
  const [customEmojis, setCustomEmojis] = useState({});
  const recentlyUsedCustomEmojis = useMemo(
    () => store.account.get('recentlyUsedCustomEmojis') || [],
  );
  useEffect(() => {
    setUIState('loading');
    (async () => {
      try {
        const emojis = await masto.v1.customEmojis.list();
        // Group emojis by category
        const emojisCat = {
          '--recent--': recentlyUsedCustomEmojis.filter((emoji) =>
            emojis.find((e) => e.shortcode === emoji.shortcode),
          ),
        };
        const othersCat = [];
        emojis.forEach((emoji) => {
          if (!emoji.visibleInPicker) return;
          customEmojisList.current?.push?.(emoji);
          if (!emoji.category) {
            othersCat.push(emoji);
            return;
          }
          if (!emojisCat[emoji.category]) {
            emojisCat[emoji.category] = [];
          }
          emojisCat[emoji.category].push(emoji);
        });
        if (othersCat.length) {
          emojisCat['--others--'] = othersCat;
        }
        setCustomEmojis(emojisCat);
        setUIState('default');
      } catch (e) {
        setUIState('error');
        console.error(e);
      }
    })();
  }, []);

  return (
    <div id="custom-emojis-sheet" class="sheet">
      <header>
        <b>Custom emojis</b>{' '}
        {uiState === 'loading' ? (
          <Loader />
        ) : (
          <small class="insignificant"> • {instance}</small>
        )}
      </header>
      <main>
        <div class="custom-emojis-list">
          {uiState === 'error' && (
            <div class="ui-state">
              <p>Error loading custom emojis</p>
            </div>
          )}
          {uiState === 'default' &&
            Object.entries(customEmojis).map(
              ([category, emojis]) =>
                !!emojis?.length && (
                  <>
                    <div class="section-header">
                      {{
                        '--recent--': 'Recently used',
                        '--others--': 'Others',
                      }[category] || category}
                    </div>
                    <section>
                      {emojis.map((emoji) => (
                        <button
                          key={emoji}
                          type="button"
                          class="plain4"
                          onClick={() => {
                            onClose();
                            requestAnimationFrame(() => {
                              onSelect(`:${emoji.shortcode}:`);
                            });
                            let recentlyUsedCustomEmojis =
                              store.account.get('recentlyUsedCustomEmojis') ||
                              [];
                            const recentlyUsedEmojiIndex =
                              recentlyUsedCustomEmojis.findIndex(
                                (e) => e.shortcode === emoji.shortcode,
                              );
                            if (recentlyUsedEmojiIndex !== -1) {
                              // Move emoji to index 0
                              recentlyUsedCustomEmojis.splice(
                                recentlyUsedEmojiIndex,
                                1,
                              );
                              recentlyUsedCustomEmojis.unshift(emoji);
                            } else {
                              recentlyUsedCustomEmojis.unshift(emoji);
                              // Remove unavailable ones
                              recentlyUsedCustomEmojis =
                                recentlyUsedCustomEmojis.filter((e) =>
                                  customEmojisList.current?.find?.(
                                    (emoji) => emoji.shortcode === e.shortcode,
                                  ),
                                );
                              // Limit to 10
                              recentlyUsedCustomEmojis =
                                recentlyUsedCustomEmojis.slice(0, 10);
                            }

                            // Store back
                            store.account.set(
                              'recentlyUsedCustomEmojis',
                              recentlyUsedCustomEmojis,
                            );
                          }}
                          title={`:${emoji.shortcode}:`}
                        >
                          <img
                            src={emoji.url || emoji.staticUrl}
                            alt={emoji.shortcode}
                            width="16"
                            height="16"
                            loading="lazy"
                            decoding="async"
                          />
                        </button>
                      ))}
                    </section>
                  </>
                ),
            )}
        </div>
      </main>
    </div>
  );
}

export default Compose;