import { LinkAttr, LinkAttrs, schema } from "./schema";
import { textblockTypeTextShortcut } from "./textshortcut/textblockTypeTextShortcut";
import { TextShortcut, TextShortcutPlugin } from "./textshortcut/TextShortcutPlugin";
import { wrappingTextShortcut } from "./textshortcut/wrappingTextShortcut";

export const textShortcutsPlugin = new TextShortcutPlugin([
  wrappingTextShortcut(/^\s*([-+*])\s$/, schema.nodes.ul),
  wrappingTextShortcut(/^\s*(1\.)\s$/, schema.nodes.ol),
  wrappingTextShortcut(/^\s*>\s$/, schema.nodes.bq),
  textblockTypeTextShortcut(/^\s*(#+)\s$/, schema.nodes.h, match => ({
    // The heading level is the number of #, capped at 2 (we only support two
    // levels of heading).
    l: Math.min(match[1].length, 2)
  })),
  new TextShortcut(/^(--|—)-$/, (state, _, start, end) => {
    return state.tr.replaceWith(start - 1, end, state.schema.nodes.hr.create()).scrollIntoView();
  }),
  /**
   * http: https: mailto: URLs
   */
  new TextShortcut(/(\ufffc|\s|^)((?:https?:\/\/|mailto:)[^\s]*)(?:\s|\u2403)$/, (state, match, start, end, insertText) => {
    const [, prefix, url] = match;
    const linkAttrs: LinkAttrs = { [LinkAttr.URL]: url };
    const link = state.schema.marks.l.create(linkAttrs);
    const urlBeforePos = start + prefix.length;
    const urlAfterPos = end;
    const tr = state.tr;
    tr.addMark(urlBeforePos, urlAfterPos, link);
    if (url.startsWith("mailto:")) {
      tr.delete(urlBeforePos, urlBeforePos + "mailto:".length);
    }
    if (insertText.length > 0) {
      tr.insertText(insertText);
    }
    return tr;
  }),
  /**
   * Email address
   */
  new TextShortcut(
    // Elaborate regex taken from http://emailregex.com/
    /(\s|^)((([^<>()\[\]\\.,;:\s@"]+(\.[^<>()\[\]\\.,;:\s@"]+)*)|(".+"))@((\[[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}])|(([a-zA-Z\-0-9]+\.)+[a-zA-Z]{2,})))(\s)$/,
    (state, match, start) => {
      const [, prefix, email] = match;
      const suffix = match[match.length - 1];
      const linkAttrs: LinkAttrs = { [LinkAttr.URL]: `mailto:${email}` };
      const link = state.schema.marks.l.create(linkAttrs);
      const emailBeforePos = start + prefix.length;
      const emailAfterPos = emailBeforePos + email.length;
      const tr = state.tr;
      tr.addMark(emailBeforePos, emailAfterPos, link);
      if (suffix.length > 0) {
        tr.insertText(suffix);
      }
      return tr;
    }
  ),
  // “Smart” opening double quotes.
  new TextShortcut(/(?:^|[\s\{\[\(\<'"\u2018\u201C])(")$/, "“"),
  // “Smart” closing double quotes.
  new TextShortcut(/"$/, "”"),
  // “Smart” opening single quotes.
  new TextShortcut(/(?:^|[\s\{\[\(\<'"\u2018\u201C])(')$/, "‘"),
  // “Smart” closing single quotes.
  new TextShortcut(/'$/, "’"),
  // Converts three dots to an ellipsis character.
  new TextShortcut(/\.\.\.$/, "…"),
  // Converts double dashes to an emdash.
  new TextShortcut(/--$/, "—")
]);