// Copyright 2021 Signal Messenger, LLC
// SPDX-License-Identifier: AGPL-3.0-only

import React, {
  FunctionComponent,
  useCallback,
  useEffect,
  useMemo,
  useRef,
  useState,
} from 'react';
import Measure, { MeasuredComponentProps } from 'react-measure';
import { noop } from 'lodash';

import classNames from 'classnames';
import { AttachmentList } from './conversation/AttachmentList';
import { AttachmentType } from '../types/Attachment';
import { Button } from './Button';
import { CompositionInput, InputApi } from './CompositionInput';
import { ContactCheckboxDisabledReason } from './conversationList/ContactCheckbox';
import { ConversationList, Row, RowType } from './ConversationList';
import { ConversationType } from '../state/ducks/conversations';
import { EmojiButton, Props as EmojiButtonProps } from './emoji/EmojiButton';
import { EmojiPickDataType } from './emoji/EmojiPicker';
import { LinkPreviewType } from '../types/message/LinkPreviews';
import { BodyRangeType, LocalizerType } from '../types/Util';
import { ModalHost } from './ModalHost';
import { StagedLinkPreview } from './conversation/StagedLinkPreview';
import { assert } from '../util/assert';
import { filterAndSortConversationsByRecent } from '../util/filterAndSortConversations';

export type DataPropsType = {
  attachments?: Array<AttachmentType>;
  candidateConversations: ReadonlyArray<ConversationType>;
  doForwardMessage: (
    selectedContacts: Array<string>,
    messageBody?: string,
    attachments?: Array<AttachmentType>,
    linkPreview?: LinkPreviewType
  ) => void;
  i18n: LocalizerType;
  isSticker: boolean;
  linkPreview?: LinkPreviewType;
  messageBody?: string;
  onClose: () => void;
  onEditorStateChange: (
    messageText: string,
    bodyRanges: Array<BodyRangeType>,
    caretLocation?: number
  ) => unknown;
  onTextTooLong: () => void;
} & Pick<EmojiButtonProps, 'recentEmojis' | 'skinTone'>;

type ActionPropsType = Pick<
  EmojiButtonProps,
  'onPickEmoji' | 'onSetSkinTone'
> & {
  removeLinkPreview: () => void;
};

export type PropsType = DataPropsType & ActionPropsType;

const MAX_FORWARD = 5;

export const ForwardMessageModal: FunctionComponent<PropsType> = ({
  attachments,
  candidateConversations,
  doForwardMessage,
  i18n,
  isSticker,
  linkPreview,
  messageBody,
  onClose,
  onEditorStateChange,
  onPickEmoji,
  onSetSkinTone,
  onTextTooLong,
  recentEmojis,
  removeLinkPreview,
  skinTone,
}) => {
  const inputRef = useRef<null | HTMLInputElement>(null);
  const inputApiRef = React.useRef<InputApi | undefined>();
  const [selectedContacts, setSelectedContacts] = useState<
    Array<ConversationType>
  >([]);
  const [searchTerm, setSearchTerm] = useState('');
  const [filteredConversations, setFilteredConversations] = useState(
    filterAndSortConversationsByRecent(candidateConversations, '')
  );
  const [attachmentsToForward, setAttachmentsToForward] = useState(attachments);
  const [isEditingMessage, setIsEditingMessage] = useState(false);
  const [messageBodyText, setMessageBodyText] = useState(messageBody || '');

  const isMessageEditable = !isSticker;

  const hasSelectedMaximumNumberOfContacts =
    selectedContacts.length >= MAX_FORWARD;

  const selectedConversationIdsSet: Set<string> = useMemo(
    () => new Set(selectedContacts.map(contact => contact.id)),
    [selectedContacts]
  );

  const focusTextEditInput = React.useCallback(() => {
    if (inputApiRef.current) {
      inputApiRef.current.focus();
    }
  }, [inputApiRef]);

  const insertEmoji = React.useCallback(
    (e: EmojiPickDataType) => {
      if (inputApiRef.current) {
        inputApiRef.current.insertEmoji(e);
        onPickEmoji(e);
      }
    },
    [inputApiRef, onPickEmoji]
  );

  const hasContactsSelected = Boolean(selectedContacts.length);

  const canForwardMessage =
    hasContactsSelected &&
    (Boolean(messageBodyText) ||
      isSticker ||
      (attachmentsToForward && attachmentsToForward.length));

  const forwardMessage = React.useCallback(() => {
    if (!canForwardMessage) {
      return;
    }

    doForwardMessage(
      selectedContacts.map(contact => contact.id),
      messageBodyText,
      attachmentsToForward,
      linkPreview
    );
  }, [
    attachmentsToForward,
    canForwardMessage,
    doForwardMessage,
    linkPreview,
    messageBodyText,
    selectedContacts,
  ]);

  const normalizedSearchTerm = searchTerm.trim();
  useEffect(() => {
    const timeout = setTimeout(() => {
      setFilteredConversations(
        filterAndSortConversationsByRecent(
          candidateConversations,
          normalizedSearchTerm
        )
      );
    }, 200);
    return () => {
      clearTimeout(timeout);
    };
  }, [candidateConversations, normalizedSearchTerm, setFilteredConversations]);

  const contactLookup = useMemo(() => {
    const map = new Map();
    candidateConversations.forEach(contact => {
      map.set(contact.id, contact);
    });
    return map;
  }, [candidateConversations]);

  const toggleSelectedConversation = useCallback(
    (conversationId: string) => {
      let removeContact = false;
      const nextSelectedContacts = selectedContacts.filter(contact => {
        if (contact.id === conversationId) {
          removeContact = true;
          return false;
        }
        return true;
      });
      if (removeContact) {
        setSelectedContacts(nextSelectedContacts);
        return;
      }
      const selectedContact = contactLookup.get(conversationId);
      if (selectedContact) {
        setSelectedContacts([...nextSelectedContacts, selectedContact]);
      }
    },
    [contactLookup, selectedContacts, setSelectedContacts]
  );

  const handleBackOrClose = useCallback(() => {
    if (isEditingMessage) {
      setIsEditingMessage(false);
    } else {
      onClose();
    }
  }, [isEditingMessage, onClose, setIsEditingMessage]);

  const rowCount = filteredConversations.length;
  const getRow = (index: number): undefined | Row => {
    const contact = filteredConversations[index];
    if (!contact) {
      return undefined;
    }

    const isSelected = selectedConversationIdsSet.has(contact.id);

    let disabledReason: undefined | ContactCheckboxDisabledReason;
    if (hasSelectedMaximumNumberOfContacts && !isSelected) {
      disabledReason = ContactCheckboxDisabledReason.MaximumContactsSelected;
    }

    return {
      type: RowType.ContactCheckbox,
      contact,
      isChecked: isSelected,
      disabledReason,
    };
  };

  useEffect(() => {
    const timeout = setTimeout(() => {
      inputRef.current?.focus();
    }, 100);

    return () => {
      clearTimeout(timeout);
    };
  }, []);

  return (
    <ModalHost onEscape={handleBackOrClose} onClose={onClose}>
      <div className="module-ForwardMessageModal">
        <div
          className={classNames('module-ForwardMessageModal__header', {
            'module-ForwardMessageModal__header--edit': isEditingMessage,
          })}
        >
          {isEditingMessage ? (
            <button
              aria-label={i18n('back')}
              className="module-ForwardMessageModal__header--back"
              onClick={() => setIsEditingMessage(false)}
              type="button"
            >
              &nbsp;
            </button>
          ) : (
            <button
              aria-label={i18n('cancel')}
              className="module-ForwardMessageModal__header--cancel"
              onClick={onClose}
              type="button"
            >
              {i18n('cancel')}
            </button>
          )}
          <h1>{i18n('forwardMessage')}</h1>
        </div>
        {isEditingMessage ? (
          <div className="module-ForwardMessageModal__main-body">
            {linkPreview ? (
              <div className="module-ForwardMessageModal--link-preview">
                <StagedLinkPreview
                  date={linkPreview.date || null}
                  description={linkPreview.description || ''}
                  domain={linkPreview.url}
                  i18n={i18n}
                  image={linkPreview.image}
                  isLoaded
                  onClose={() => removeLinkPreview()}
                  title={linkPreview.title}
                />
              </div>
            ) : null}
            {attachmentsToForward && attachmentsToForward.length ? (
              <AttachmentList
                attachments={attachmentsToForward}
                i18n={i18n}
                onCloseAttachment={(attachment: AttachmentType) => {
                  const newAttachments = attachmentsToForward.filter(
                    currentAttachment => currentAttachment !== attachment
                  );
                  setAttachmentsToForward(newAttachments);
                }}
              />
            ) : null}
            <div className="module-ForwardMessageModal__text-edit-area">
              <CompositionInput
                clearQuotedMessage={shouldNeverBeCalled}
                draftText={messageBodyText}
                getQuotedMessage={noop}
                i18n={i18n}
                inputApi={inputApiRef}
                large
                moduleClassName="module-ForwardMessageModal__input"
                onEditorStateChange={(
                  messageText,
                  bodyRanges,
                  caretLocation
                ) => {
                  setMessageBodyText(messageText);
                  onEditorStateChange(messageText, bodyRanges, caretLocation);
                }}
                onPickEmoji={onPickEmoji}
                onSubmit={forwardMessage}
                onTextTooLong={onTextTooLong}
              />
              <div className="module-ForwardMessageModal__emoji">
                <EmojiButton
                  doSend={noop}
                  i18n={i18n}
                  onClose={focusTextEditInput}
                  onPickEmoji={insertEmoji}
                  onSetSkinTone={onSetSkinTone}
                  recentEmojis={recentEmojis}
                  skinTone={skinTone}
                />
              </div>
            </div>
          </div>
        ) : (
          <div className="module-ForwardMessageModal__main-body">
            <div className="module-ForwardMessageModal__search">
              <i className="module-ForwardMessageModal__search--icon" />
              <input
                type="text"
                className="module-ForwardMessageModal__search--input"
                disabled={candidateConversations.length === 0}
                placeholder={i18n('contactSearchPlaceholder')}
                onChange={event => {
                  setSearchTerm(event.target.value);
                }}
                ref={inputRef}
                value={searchTerm}
              />
            </div>
            {candidateConversations.length ? (
              <Measure bounds>
                {({ contentRect, measureRef }: MeasuredComponentProps) => {
                  // We disable this ESLint rule because we're capturing a bubbled keydown
                  //   event. See [this note in the jsx-a11y docs][0].
                  //
                  // [0]: https://github.com/jsx-eslint/eslint-plugin-jsx-a11y/blob/c275964f52c35775208bd00cb612c6f82e42e34f/docs/rules/no-static-element-interactions.md#case-the-event-handler-is-only-being-used-to-capture-bubbled-events
                  /* eslint-disable jsx-a11y/no-static-element-interactions */
                  return (
                    <div
                      className="module-ForwardMessageModal__list-wrapper"
                      ref={measureRef}
                    >
                      <ConversationList
                        dimensions={contentRect.bounds}
                        getRow={getRow}
                        i18n={i18n}
                        onClickArchiveButton={shouldNeverBeCalled}
                        onClickContactCheckbox={(
                          conversationId: string,
                          disabledReason:
                            | undefined
                            | ContactCheckboxDisabledReason
                        ) => {
                          if (
                            disabledReason !==
                            ContactCheckboxDisabledReason.MaximumContactsSelected
                          ) {
                            toggleSelectedConversation(conversationId);
                          }
                        }}
                        onSelectConversation={shouldNeverBeCalled}
                        renderMessageSearchResult={() => {
                          shouldNeverBeCalled();
                          return <div />;
                        }}
                        rowCount={rowCount}
                        shouldRecomputeRowHeights={false}
                        showChooseGroupMembers={shouldNeverBeCalled}
                        startNewConversationFromPhoneNumber={
                          shouldNeverBeCalled
                        }
                      />
                    </div>
                  );
                  /* eslint-enable jsx-a11y/no-static-element-interactions */
                }}
              </Measure>
            ) : (
              <div className="module-ForwardMessageModal__no-candidate-contacts">
                {i18n('noContactsFound')}
              </div>
            )}
          </div>
        )}
        <div className="module-ForwardMessageModal__footer">
          <div>
            {Boolean(selectedContacts.length) &&
              selectedContacts.map(contact => contact.title).join(', ')}
          </div>
          <div>
            {isEditingMessage || !isMessageEditable ? (
              <Button
                aria-label={i18n('ForwardMessageModal--continue')}
                className="module-ForwardMessageModal__send-button module-ForwardMessageModal__send-button--forward"
                disabled={!canForwardMessage}
                onClick={forwardMessage}
              />
            ) : (
              <Button
                aria-label={i18n('forwardMessage')}
                className="module-ForwardMessageModal__send-button module-ForwardMessageModal__send-button--continue"
                disabled={!hasContactsSelected}
                onClick={() => setIsEditingMessage(true)}
              />
            )}
          </div>
        </div>
      </div>
    </ModalHost>
  );
};

function shouldNeverBeCalled(..._args: ReadonlyArray<unknown>): void {
  assert(false, 'This should never be called. Doing nothing');
}
