const blog = require('./blog')()
const rss = require('rss')

class RSS {
    constructor(x) {
        this.object = {
            feed: null,
            baseUrl: x.baseUrl,
        }
    }

    async GetFeed(x) {
        if (this.object.feed) {
            return this.object.feed
        } else {
            return await this.#CreateFeed(x).then(feed => {
                this.object.feed = feed
                return this.object.feed
            })
        }
    }

    async #CreateFeed(x) {
        return blog.ReadBlogs().then(blogs => {
            const feed = new rss({
                title: x.title,
                description: x.description,
                author: x.author
            })

            blogs.forEach(value => {
                feed.item({
                    title: value.title,
                    description: value.body,
                    url: `${this.object.baseUrl}blog`,
                    date: value.date
                })
            })
            return feed.xml({ident: true})
        })
    }
}

module.exports = (x) => new RSS(x)