const fs = require("fs-extra");
const sass = require("sass");
const { promisify } = require("util");
const sassRender = promisify(sass.render);
const postcss = require("postcss");
const autoprefixer = require("autoprefixer");
const markdownIt = require("markdown-it");
const markdownItRenderer = new markdownIt();
const markdownItAnchor = require("markdown-it-anchor");
// const relativeUrl = require("eleventy-filter-relative-url");
const pluginTOC = require("eleventy-plugin-toc");
const moment = require("moment");
const description = require("eleventy-plugin-description");
const pluginRss = require("@11ty/eleventy-plugin-rss");
const UpgradeHelper = require("@11ty/eleventy-upgrade-help");
const xmlFiltersPlugin = require("eleventy-xml-plugin");

const inspect = require("node:util").inspect;

// relativeURL
const path = require("path");
const urlFilter = require("@11ty/eleventy/src/Filters/Url");
const indexify = (url) => url.replace(/(\/[^.]*)$/, "$1index.html");

module.exports = function (eleventyConfig) {
    let pathPrefix = "/";

    eleventyConfig.addPlugin(pluginRss);
    //Blog excerpts
    eleventyConfig.addPlugin(description);
    // Eleventy Navigation (https://www.11ty.dev/docs/plugins/navigation/)
    eleventyConfig.addPlugin(require("@11ty/eleventy-navigation"));
    // Eleventy RSS Feed (https://www.11ty.dev/docs/plugins/rss/)
    eleventyConfig.addPlugin(require("@11ty/eleventy-plugin-rss"));
    // Filter to generate a Table of Contents from page content
    eleventyConfig.addPlugin(pluginTOC, {
        tags: ["h2", "h3"],
        wrapper: "div",
    });
    // TODO https://www.npmjs.com/package/eleventy-plugin-meta-generator
    // Eleventy Syntax Highlighting (https://www.11ty.dev/docs/plugins/syntaxhighlight/)
    eleventyConfig.addPlugin(require("@11ty/eleventy-plugin-syntaxhighlight"));

    eleventyConfig.addPlugin(xmlFiltersPlugin);

    // Custom Collections
    eleventyConfig.addCollection("pages", (collection) =>
        collection.getFilteredByGlob("./src/_pages/**/*")
    );

    eleventyConfig.addCollection("posts", (collection) =>
        collection
            .getFilteredByGlob("./src/_posts/**/*")
            .filter(
                (item) => item.data.draft !== true && item.date <= new Date()
            )
            .reverse()
            .map((cur, i, all) => {
                cur.data["siblings"] = {
                    next: all[i - 1],
                    prev: all[i + 1],
                };
                return cur;
            })
    );

    eleventyConfig.addCollection("projects", (collection) =>
        collection
            .getFilteredByGlob("./src/projects/**/*")
            .sort((a, b) => a.data.weight - b.data.weight)
    );

    // eleventyConfig.addCollection("posts", function (collectionApi) {
    //     return collectionApi.getFilteredByGlob("./src/_posts/**/*.md");
    // });

    eleventyConfig.addCollection("tags", (collection) => {
        let tags = new Set();

        collection.getAll().forEach((item) => {
            if ("tags" in item.data) {
                for (const tag of item.data.tags) {
                    tags.add(tag);
                }
            }
        });

        return [...tags];
    });

    // Filters

    // eleventyConfig.addFilter("markdownify", (str) => {
    //     return markdownItRenderer.renderInline(str);
    // });

    eleventyConfig.addFilter("markdownify", (string) => {
        return md.renderInline(string);
    });

    eleventyConfig.addNunjucksFilter("markdownify", (str) => md.render(str));

    eleventyConfig.addFilter("jsonify", (variable) => JSON.stringify(variable));

    eleventyConfig.addFilter("slugify", (str) =>
        require("slugify")(str, {
            lower: true,
            replacement: "-",
            remove: /[*+~.·,()''`´%!?¿:@]/g,
        })
    );

    eleventyConfig.addFilter("where", (array, key, value) =>
        array.filter((item) => {
            const keys = key.split(".");
            const reducedKey = keys.reduce((object, key) => object[key], item);

            return reducedKey === value ? item : false;
        })
    );

    eleventyConfig.addFilter("date", (date, format = "") =>
        require("moment")(date).format(format)
    );

    // eleventyConfig.addFilter("absolute_url", relativeURL);
    eleventyConfig.addLiquidFilter("toUTCString", (date) => {
        const utc = date.toUTCString();
        return moment.utc(utc).format("MMMM Do YYYY");
    });

    eleventyConfig.addFilter("number_of_words", numberOfWords);

    // eleventyConfig.addFilter("absolute_url", relativeUrl);

    // eleventyConfig.addShortcode("where_exp", function (item, exp) {
    //     console.log(exp);
    //     return eval(exp);
    // });
    eleventyConfig.addFilter("where_exp", function (value) {
        // where_exp function
        return value.hidden != true;
    });

    eleventyConfig.addFilter("inspect", function (obj = {}) {
        return inspect(obj, {sorted: true});
      });

    eleventyConfig.addLayoutAlias(
        "archive-taxonomy",
        "layouts/archive-taxonomy.html"
    );
    eleventyConfig.addLayoutAlias("archive", "layouts/archive.html");
    eleventyConfig.addLayoutAlias("categories", "layouts/categories.html");
    eleventyConfig.addLayoutAlias("category", "layouts/category.html");
    eleventyConfig.addLayoutAlias("collection", "layouts/collection.html");
    eleventyConfig.addLayoutAlias("compress", "layouts/compress.html");
    eleventyConfig.addLayoutAlias("default", "layouts/default.html");
    eleventyConfig.addLayoutAlias("home", "layouts/home.html");
    eleventyConfig.addLayoutAlias("posts", "layouts/posts.html");
    eleventyConfig.addLayoutAlias("search", "layouts/search.html");
    eleventyConfig.addLayoutAlias("single", "layouts/single.html");
    eleventyConfig.addLayoutAlias("splash", "layouts/splash.html");
    eleventyConfig.addLayoutAlias("tag", "layouts/tag.html");
    eleventyConfig.addLayoutAlias("tags", "layouts/tags.html");
    eleventyConfig.addLayoutAlias("gallery", "layouts/gallery");

    // Passthrough copy
    // don't use .gitignore (allows compiling sass to css into a monitored folder WITHOUT committing it to repo)
    eleventyConfig.setUseGitIgnore(false);

    //Copy CNAME
    eleventyConfig.addPassthroughCopy("src/CNAME");

    // Processing configuration
    eleventyConfig.addPassthroughCopy("src/favicon.ico");
    eleventyConfig.addPassthroughCopy("src/admin");
    eleventyConfig.addPassthroughCopy("src/assets");
    // eleventyConfig.addPassthroughCopy({ "src/_sass": "assets/css" });

    eleventyConfig.addShortcode("post_url", (collection, slug) => {
        try {
            if (collection.length < 1) {
                throw "Collection appears to be empty";
            }
            if (!Array.isArray(collection)) {
                throw "Collection is an invalid type - it must be an array!";
            }
            if (typeof slug !== "string") {
                throw "Slug is an invalid type - it must be a string!";
            }

            const found = collection.find((p) => p.fileSlug == slug);
            if (found === 0 || found === undefined) {
                throw `${slug} not found in specified collection.`;
            } else {
                return found.url;
            }
        } catch (e) {
            console.error(
                `RMCG:An error occured while searching for the url to ${slug}. Details:`,
                e
            );
        }
    });

    // Set section

    // Configure BrowserSync to serve the 404 page for missing files
    eleventyConfig.setBrowserSyncConfig({
        callbacks: {
            ready: (_err, browserSync) => {
                const content_404 = fs.readFileSync("dist/404.html");

                browserSync.addMiddleware("*", (_req, res) => {
                    // render the 404 content instead of redirecting
                    res.write(content_404);
                    res.end();
                });
            },
        },
    });

    eleventyConfig.setBrowserSyncConfig({
        files: "./dist/assets/styles/**/*.css",
    });

    // Merge Data (https://www.11ty.dev/docs/data-deep-merge/)
    eleventyConfig.setDataDeepMerge(true);

    eleventyConfig.setFrontMatterParsingOptions({
        excerpt: true,
    });

    eleventyConfig.setLibrary("md", markdownIt().use(markdownItAnchor));

    eleventyConfig.setLiquidOptions({
        // dynamicPartials: false,
        // strictVariables: false,
        // strictFilters: false,
        jekyllInclude: true,
    });

    // Markdown Configuration
    const md = require("markdown-it")({
        html: true,
        breaks: true,
        linkify: true,
    });

    eleventyConfig.setLibrary(
        "md",
        md
            .use(require("markdown-it-attrs"))
            .use(require("markdown-it-container"), "", {
                validate: () => true,
                render: (tokens, idx) => {
                    if (tokens[idx].nesting === 1) {
                        const classList = tokens[idx].info.trim();
                        return `<div ${classList && `class="${classList}"`}>`;
                    } else {
                        return `</div>`;
                    }
                },
            })
            .use(require("markdown-it-fontawesome"))
            .use(require("markdown-it-footnote"))
    );

    // override markdown-it-footnote anchor template to use a different unicode character
    md.renderer.rules.footnote_anchor = (tokens, idx, options, env, slf) => {
        var id = slf.rules.footnote_anchor_name(tokens, idx, options, env, slf);

        if (tokens[idx].meta.subId > 0) {
            id += ":" + tokens[idx].meta.subId;
        }

        /* ⇑ with escape code to prevent display as Apple Emoji on iOS */
        return (
            ' <a href="#fnref' +
            id +
            '" class="footnote-backref">\u21d1\uFE0E</a>'
        );
    };

    //for upgrade sanity
    //eleventyConfig.addPlugin(UpgradeHelper);

    // eleventyConfig.addWatchTarget("./assets/css/");
    // eleventyConfig.addTransform(
    //     "sass",
    //     async function sassTransform(content, outputPath) {
    //         if (outputPath?.endsWith(".css")) {
    //             const { css } = await sassRender({
    //                 data: content,
    //                 outputStyle: "compressed",
    //                 precision: 3,
    //             });
    //             return css;
    //         }
    //         return content;
    //     }
    // );

    eleventyConfig.addFilter("relative_url", relativeURLALT);
    eleventyConfig.addFilter("absolute_url", relativeURLALT);

    return {
        templateFormats: ["html", "liquid", "md", "njk"],

        pathPrefix,

        passthroughFileCopy: true,

        dir: {
            input: "src",
            includes: "_includes",
            data: "_data",
            output: "dist",
            // input: "./", // Equivalent to Jekyll's source property
            // output: "./_site", // Equivalent to Jekyll's destination property
        },
    };
};

function numberOfWords(content) {
    return content.split(/\s+/g).length;
}

function relativeURL(url, pathPrefix = undefined) {
    if (pathPrefix !== undefined) {
        // Fall back on original url filter if pathPrefix is set.
        return urlFilter(url, pathPrefix);
    }

    if (pathPrefix == undefined && this.page == undefined) {
        return urlFilter(url, "");
    }

    // Look up the url of the current rendering page, which is accessible via
    // `this`.
    //console.log(this); // rmcg

    // rmcg - removed ctx from this.ctx.page.url
    const currentDir = this.page.url;
    const filteredUrl = urlFilter(url, "/");

    // Make sure the index.html is expressed.
    const indexUrl = indexify(filteredUrl);

    // Check that the url doesn't specify a protocol.
    const u = new URL(indexUrl, "make-relative://");
    if (u.protocol !== "make-relative:") {
        // It has a protocol, so just return the filtered URL output.
        return filteredUrl;
    }

    // Return the relative path, or `index.html` if it's the same as the current
    // page's directory.
    const relativePath = `${
        path.relative(currentDir, u.pathname) || "index.html"
    }`;
    return relativePath;
}

/**
 * Just `{{ '/something' | url }}` will return the relative path to
 * `/something/index.html`.
 *
 * `{{ '/something.with.dots' | url }}` will return the relative path to
 * `/something.with.dots`.
 *
 * @param {string} url the URL to transform
 * @param {string} [pathPrefix] optional path prefix to force an absolute URL
 * @returns {string} resulting URL
 */
function relativeURLALT(url, pathPrefix = undefined) {
    pathPrefix = "/";
    //      console.log(url);
    //      console.log(pathPrefix);
    //      console.log(this.page);
    if (pathPrefix !== undefined) {
        // Fall back on original url filter if pathPrefix is set.
        return urlFilter(url, pathPrefix);
    }

    if (pathPrefix == undefined && this.page == undefined) {
        //      console.log("dropping out");
        return urlFilter(url, "");
    }

    // Look up the url of the current rendering page, which is accessible via
    // `this`.
    console.log(this);
    const currentDir = this.page.url;
    const filteredUrl = urlFilter(url, "/");

    // Make sure the index.html is expressed.
    const indexUrl = indexify(filteredUrl);

    // Check that the url doesn't specify a protocol.
    const u = new URL(indexUrl, "make-relative://");
    if (u.protocol !== "make-relative:") {
        // It has a protocol, so just return the filtered URL output.
        return filteredUrl;
    }

    // Return the relative path, or `index.html` if it's the same as the current
    // page's directory.
    const relativePath = `${
        path.relative(currentDir, u.pathname) || "index.html"
    }`;
    return relativePath;
}