const fs = require('fs');
const S = require('string');
const path = require('path');

const CONTENT_PATH_PREFIX = 'content/'
const OUTPUT_PATH = "static/js/lunr/PagesIndex.json"

const getTree = dir => {
    const allFiles = [];

    const items = fs.readdirSync(dir);
    items.forEach(item => {
        const itemPath = path.join(dir, item);
        const stats = fs.statSync(itemPath);
        if (stats.isDirectory()) {
            allFiles.push(...getTree(itemPath));
        } else {
            allFiles.push(itemPath);
        }
    });
    return allFiles;
}

const pageIndices = getTree(CONTENT_PATH_PREFIX)
    .map(file => {
        const href = S(file).chompLeft(CONTENT_PATH_PREFIX).chompRight('.md').s;

        if (href.startsWith('_')) {
            return;
        }

        const content = fs.readFileSync(file).toString();

        const splitContent = content.split('---')
        const frontMatter = {};
        try {
            const frontMatterRaw = splitContent[1].trim();

            for (const line of frontMatterRaw.split('\n')) {
                try {
                    const parts = line.split(':');
                    const key = parts[0].trim()
                    const value = JSON.parse(parts[1]);

                    frontMatter[key] = value;
                } catch (e) {
                    continue;
                }
            }
        } catch (e) {
            return;
        }

        if (frontMatter.draft !== false) {
            return;
        }

        const pageIndex = {}

        pageIndex['title'] = frontMatter.title;
        pageIndex['href'] = href;
        pageIndex['content'] = S(splitContent[2]).trim().stripTags().stripPunctuation().s;

        if (frontMatter.tags) {
            pageIndex['tags'] = frontMatter.tags;
        }

        return pageIndex;
    })
    .filter(e => e)
;

fs.mkdirSync(path.dirname(OUTPUT_PATH), {
    recursive: true,
});
fs.writeFileSync(OUTPUT_PATH, JSON.stringify(pageIndices));