import GelbooruServiceResponse from "../types/GelbooruServiceResponse";
import Image from "../types/Image";
import BotApiService from "./BotApiService";
import GelbooruApiService from "./GelbooruApiService";

class ImageService {
    postsQueue: Image[] = [];
    
    async get(): Promise<Image> {
        while (this.postsQueue.length === 0) {
            const validPosts = await this.getNewValidImages();
            this.postsQueue = validPosts;
        }
        return this.postsQueue.pop() as Image;
    }

    private async getNewValidImages(): Promise<Image[]> {
        const gelbooruResponse: GelbooruServiceResponse = await GelbooruApiService.get();
        const posts = gelbooruResponse.posts;

        const botResponse = await BotApiService.getAll();
        const imagesUrls = botResponse.images.map(image => image.url);

        const validPosts = posts
            .filter(post => !imagesUrls.some(url => url === post.url))
            .map(post => ({ url: post.url, tags: post.tags, content: "TODO" }));

        return validPosts;
    }
}

export default new ImageService();