const path = require('path');
const fs = require('fs');
const process = require('process');
const markdownit = require('markdown-it');
var markdownItAttrs = require('markdown-it-attrs');
const md = markdownit({
  html: true,
  linkify: true,
  typographer: true,
}).use(
  markdownItAttrs, {
    // optional, these are default options
    leftDelimiter: '{',
    rightDelimiter: '}',
    allowedAttributes: []  // empty array = all attributes are allowed
  }
);
const moment = require('moment-timezone').tz.setDefault("UTC");

const getSiteName = () => {
  return 'No Moss 3 Carbo Landfill Online Library';
}

const trimSlashes = ({path}) => {
  return path.replace(/^[\/\\]|[\/\\]$/g, '');
};
const getDirectoryName = ({directory}) => {
  directory = trimSlashes({path: directory});
  let title = trimSlashes({path: directory.replace("public", "")}).replaceAll(path.sep, path.posix.sep);
  return (directory=="public") ? getSiteName() : title;
};
const getDirectoryTitle = ({directory}) => {
  directory = trimSlashes({path: directory});
  let title = trimSlashes({path: directory.replace("public", "")}).replaceAll(path.sep, path.posix.sep);
  return (directory=="public") ? getSiteName() : `${title} Listing - ${getSiteName()}`;
};
const getWelcomeBanner = ({directory}) => {
  return trimSlashes({path: directory.replace("public", `Welcome to ${getSiteName()}`)});
};
const shouldShowDirectorySeparator = ({index}) => (index > 0);
const shouldShowWelcomeBanner = ({paths}) => (paths.length == 1);
const shouldOmitLinkOnLastBreadcrumb = ({paths, index}) => (index == paths.length-1);

const resolveReadmeFile = ({directory}) => {
  const resolveFile = (file) => {
    const pathToFile = path.join(process.cwd(), "..", directory, file)
    return fs.existsSync(pathToFile) ? pathToFile : "";
  };
  return (
    resolveFile("README.md") ||
    resolveFile("README.txt") ||
    resolveFile("README") ||
    resolveFile("README.html") ||
    ""
  );
};
const directoryContainsReadme = ({directory}) => resolveReadmeFile({directory});
const printMarkdownFile = ({file}) => {

};
const printReadme = ({directory}) => {
  return md.render(fs.readFileSync(resolveReadmeFile({directory})).toString());
};

module.exports = {
    trimSlashes,
    getSiteName,
    getDirectoryName,
    getDirectoryTitle,
    getWelcomeBanner,
    shouldShowDirectorySeparator,
    shouldShowWelcomeBanner,
    shouldOmitLinkOnLastBreadcrumb,
    directoryContainsReadme,
    printReadme,
    md,
    moment,
};