require('dotenv').config()

const { DateTime } = require("luxon");
const pluginNavigation = require("@11ty/eleventy-navigation");
const markdownIt = require('markdown-it')
const markdownItAttrs = require('markdown-it-attrs')
const Image = require("@11ty/eleventy-img");

const markdownItOptions = {
  html: true,
  breaks: false,
  linkify: true
}

const parseDate = (date) => typeof date === 'string' ?
  DateTime.fromISO(date).setZone("Europe/Paris") :
  DateTime.fromJSDate(date, {zone: 'utc'}).setZone("Europe/Paris")

async function imageShortcode(src, alt, sizes, classes) {
  let metadata = await Image(src, {
    widths: [300, 600, 1200],
    formats: ["webp", "jpg"],
    outputDir: '_site/images/generated',
    urlPath: '/images/generated'
  });

  let imageAttributes = {
    alt,
    sizes,
    loading: "lazy",
    decoding: "async",
    class: classes
  };

  // You bet we throw an error on missing alt in `imageAttributes` (alt="" works okay)
  return Image.generateHTML(metadata, imageAttributes);
}


module.exports = function(eleventyConfig) {
  eleventyConfig.addPlugin(pluginNavigation);

  eleventyConfig.setUseGitIgnore(false);

  eleventyConfig.addPassthroughCopy("src/*.png");
  eleventyConfig.addPassthroughCopy("src/*.ico");
  eleventyConfig.addPassthroughCopy("src/css");
  eleventyConfig.addPassthroughCopy("src/js");
  eleventyConfig.addPassthroughCopy("src/fonts");
  eleventyConfig.addPassthroughCopy("src/images");
  eleventyConfig.addPassthroughCopy("src/il/*.jpg");
  eleventyConfig.addPassthroughCopy("src/il/*.pdf");
  eleventyConfig.addPassthroughCopy("src/araberlin/*.webp");
  eleventyConfig.addPassthroughCopy("src/araberlin/*.jpg");
  eleventyConfig.addPassthroughCopy("src/araberlin/*.pdf");

  eleventyConfig.addFilter("toHTML", str => {
    return new markdownIt(markdownItOptions).renderInline(str);
  });

  eleventyConfig.addFilter("readableDate", dateObj => {
    return parseDate(dateObj).setLocale("fr").toFormat("dd LLL yyyy");
  });

  // https://html.spec.whatwg.org/multipage/common-microsyntaxes.html#valid-date-string
  eleventyConfig.addFilter('htmlDateString', (dateObj) => {
    return parseDate(dateObj).toFormat('yyyy-LL-dd');
  });
  eleventyConfig.addFilter('htmlDateTimeISO', (dateObj) => {
    return parseDate(dateObj).toISO();
  });

// Get the first `n` elements of a collection.
  eleventyConfig.addFilter("head", (array, n) => {
    if (!Array.isArray(array) || array.length === 0) {
      return [];
    }
    if (n < 0) {
      return array.slice(n);
    }

    return array.slice(0, n);
  });

  eleventyConfig.addFilter("nlToBr", string => string.replaceAll('\n', '<br>'))

  eleventyConfig.setLibrary('md', markdownIt(markdownItOptions).use(markdownItAttrs))

  eleventyConfig.setFrontMatterParsingOptions({ excerpt: true });

  eleventyConfig.addAsyncShortcode("image", imageShortcode)

  return {
    dir: {
      input: 'src'
    },

    // Pre-process *.md files with: (default: `liquid`)
    // markdownTemplateEngine: "njk",

    // Pre-process *.html files with: (default: `liquid`)
    htmlTemplateEngine: "njk",
  }
}