export interface Character {
  name: {
    full: string;
  };
  id: number;
  image: {
    large: string;
    medium: string;
  };
}

export interface CharactersPage {
  data: {
    Page: {
      characters: Character[];
      pageInfo: {
        hasNextPage: boolean;
        currentPage: number;
      };
    };
  };
}

const charactersPage = async (page: number): Promise<CharactersPage> =>
  await (
    await fetch('https://graphql.anilist.co', {
      method: 'POST',
      headers: {
        'Content-Type': 'application/json',
        Accept: 'application/json'
      },
      body: JSON.stringify({
        query: `{ Page(page: ${page}, perPage: 50) {
				characters(isBirthday: true) { name { full } id image { large medium } }
				pageInfo { hasNextPage currentPage }
			} }`
      })
    })
  ).json();

export const todaysCharacterBirthdays = async (): Promise<Character[]> => {
  const characters = [];
  let page = 1;
  let currentPage = await charactersPage(page);

  for (const character of currentPage['data']['Page']['characters'])
    characters.push({
      id: character['id'],
      name: {
        full: character['name']['full']
      },
      image: {
        large: character['image']['large'],
        medium: character['image']['medium']
      }
    });

  while (currentPage['data']['Page']['pageInfo']['hasNextPage']) {
    for (const character of currentPage['data']['Page']['characters'])
      characters.push({
        id: character['id'],
        name: {
          full: character['name']['full']
        },
        image: {
          large: character['image']['large'],
          medium: character['image']['medium']
        }
      });

    page += 1;
    currentPage = await charactersPage(page);
  }

  for (const character of currentPage['data']['Page']['characters'])
    characters.push({
      id: character['id'],
      name: {
        full: character['name']['full']
      },
      image: {
        large: character['image']['large'],
        medium: character['image']['medium']
      }
    });

  return characters;
};