import {Event} from 'nostr-tools';
import {elem, elemCanvas, parseTextContent} from './utils/dom';
import {getNoxyUrl} from './utils/url';
import {getViewElem, getViewOptions} from './view';
import {parseJSON} from './media';
import {sortByCreatedAt} from './events';

type Profile = {
  name: string;
  about?: string;
  picture?: string;
  website?: string;
}

const transformMetadata = (data: unknown): Profile | undefined => {
  if (!data || typeof data !== 'object' || Array.isArray(data)) {
    console.warn('expected nip-01 JSON object with user info, but got something funny', data);
    return;
  }
  const hasNameString = 'name' in data && typeof data.name === 'string';
  const hasAboutString = 'about' in data && typeof data.about === 'string';
  const hasPictureString = 'picture' in data && typeof data.picture === 'string';
  // custom
  const hasDisplayName = 'display_name' in data && typeof data.display_name === 'string';
  const hasWebsite = 'website' in data && typeof data.website === 'string';

  if (!hasNameString && !hasAboutString && !hasPictureString && !hasDisplayName) {
    console.warn('expected basic nip-01 user info (name, about, picture) but nothing found', data);
    return;
  }
  const name = (
    hasNameString && data.name as string
    || hasDisplayName && data.display_name as string
    || ''
  );
  return {
    name,
    ...(hasAboutString && {about: data.about as string}),
    ...(hasPictureString && {picture: data.picture as string}),
    ...(hasWebsite && {website: data.website as string})
  };
};

const profileMap: {
  [pubkey: string]: Profile
} = {};

const metadataList: Array<Event> = [];

export const handleMetadata = (evt: Event, relay: string) => {
  if (metadataList.find(({id}) => id === evt.id)) {
    return;
  }
  const contactEventList = metadataList.filter(({pubkey}) => pubkey === evt.pubkey);
  metadataList.push(evt);
  contactEventList.push(evt);
  contactEventList.sort(sortByCreatedAt);

  if (contactEventList.some(({created_at}) => created_at > evt.created_at) ) {
    // evt is older
    return;
  }
  const content = parseJSON(evt.content);
  const metadata = transformMetadata(content);
  if (!metadata) {
    return;
  }
  profileMap[evt.pubkey] = metadata;

  if (metadata.picture) {
    const imgUrl = getNoxyUrl('data', metadata.picture, evt.id, relay);
    if (imgUrl) {
      // update profile images that used some nip-13 work
      // if (imgUrl.href && validatePow(evt)) {
      //   document.body
      //     .querySelectorAll(`canvas[data-pubkey="${evt.pubkey}"]`)
      //     .forEach(canvas => canvas.parentNode?.replaceChild(elem('img', {src: imgUrl.href}), canvas));
      // }
    }
  }
  if (metadata.name) {
    // update profile names
    document.body
      .querySelectorAll(`[data-profile="${evt.pubkey}"]`)
      .forEach((username: HTMLElement) => {
        username.textContent = metadata.name;
        username.classList.add('mbox-kind0-name');
      });
  }
  if (metadata.about) {
    const about = getViewElem(`about-${evt.pubkey}`);
    if (about) {
      const view = getViewOptions();
      about.replaceChildren(...parseTextContent(
        view.type === 'contacts'
          ? metadata.about.split('\n')[0]
          : metadata.about
      )[0]);
    }
  }
};

export const getMetadata = (pubkey: string) => {
  const user = profileMap[pubkey];
  const about = user?.about;
  const name = user?.name;
  const userName = name || pubkey.slice(0, 8);
  // const userImg = user?.picture;
  const img = /* (userImg && validatePow(evt)) ? elem('img', {
    alt: `${userName} ${host}`,
    loading: 'lazy',
    src: userImg,
    title: `${userName} on ${host} ${userAbout}`,
  }) : */ elemCanvas(pubkey);
  return {about, img, name, userName};
};

export const renderProfile = (pubkey: string) => {
  const header = getViewElem('header');
  const metadata = profileMap[pubkey];
  if (!header || !metadata) {
    return;
  }
  if (metadata.name) {
    const h1 = header.querySelector('h1');
    if (h1) {
      h1.textContent = metadata.name;
      document.title = metadata.name;
    } else {
      header.append(elem('h1', {}, metadata.name));
    }
  }
  const detail = getViewElem(`detail-${pubkey}`);
  if (metadata.about && !detail.children.length) {
    const [content] = parseTextContent(metadata.about);
    detail?.append(...content);
  }
  if (metadata.website) {
    const website = detail.querySelector('[data-website]');
    if (website) {
      const url = metadata.website.toLowerCase().startsWith('http') ? metadata.website : `https://${metadata.website}`;
      const [content] = parseTextContent(url);
      website.replaceChildren(...content);
      (website as HTMLDivElement).hidden = false;
    } else {
      detail.append(elem('div', {data: {website: ''}}, metadata.name));
    }
  }
};