import pugPlugin from "@11ty/eleventy-plugin-pug";
import brokenLinksPlugin from "eleventy-plugin-broken-links";
import { eleventyImageTransformPlugin } from "@11ty/eleventy-img";
import syntaxHighlight from "@11ty/eleventy-plugin-syntaxhighlight";
import { EleventyRenderPlugin, IdAttributePlugin } from '@11ty/eleventy';
import * as fs from 'fs';
import * as opml from 'opml';

export default function (eleventyConfig) {
    eleventyConfig.setInputDirectory("src")
    eleventyConfig.addPlugin(brokenLinksPlugin);
    eleventyConfig.addPlugin(pugPlugin);
    eleventyConfig.addPlugin(syntaxHighlight);
    eleventyConfig.addPlugin(eleventyImageTransformPlugin, {
        htmlOptions: {
            imgAttributes: {
                alt: '',
            },
        },
    });
    eleventyConfig.addPlugin(IdAttributePlugin);
    eleventyConfig.addPlugin(EleventyRenderPlugin);
    eleventyConfig.addPassthroughCopy("src/assets/**")

    eleventyConfig.addCollection("blogByYear", api => {
        const postsByYear = {}
        const posts = api.getFilteredByTag('blog')
        const years = []
        for ( const post of posts ) {
            const year = post.date.getFullYear()
            if ( !postsByYear[year] ) postsByYear[year] = []
            postsByYear[year] = [post, ...postsByYear[year]]
            if ( !years.includes(year) ) years.push(year)
        }

        return years.sort().reverse().map(year => ({
            year,
            posts: postsByYear[year],
        }))
    })

    eleventyConfig.addCollection("blogByTag", api => {
        const postsByTag = {}
        const posts = api.getFilteredByTag('blog')
        const tags = []
        for ( const post of posts ) {
            for ( const tag of post.data.blogtags || [] ) {
                if ( !postsByTag[tag] ) postsByTag[tag] = []
                postsByTag[tag].push(post)
                if ( !tags.includes(tag) ) tags.push(tag)
            }
        }

        return tags.sort().map(tag => ({
            tag,
            posts: postsByTag[tag],
        }))
    })

    eleventyConfig.addCollection("opmlByCategory", async api => {
        const xml = fs.readFileSync("./src/assets/rss_opml.xml")
        const parsed = await new Promise((res, rej) => {
            opml.parse(xml, (err, doc) => err ? rej(err) : res(doc))
        })

        return parsed.opml.body.subs
    })
}