import fs from 'fs';
import path from 'path';
import { fileURLToPath } from 'url';

/**
 * Converts string to CamelCase
 *
 * @param {string} string
 * @returns {string} A camelized string
 */
export const toCamelCase = (string) =>
  string.replace(/^([A-Z])|[\s-_]+(\w)/g, (match, p1, p2) =>
    p2 ? p2.toUpperCase() : p1.toLowerCase(),
  );

/**
 * Converts string to PascalCase
 *
 * @param {string} string
 * @returns {string} A pascalized string
 */
export const toPascalCase = (string) => {
  const camelCase = toCamelCase(string);

  return camelCase.charAt(0).toUpperCase() + camelCase.slice(1);
};

/**
 * Converts string to KebabCase
 *
 * @param {string} string
 * @returns {string} A kebabized string
 */
export const toKebabCase = (string) => string.replace(/([a-z0-9])([A-Z])/g, '$1-$2').toLowerCase();

/**
 * Resets the file contents.
 *
 * @param {string} fileName
 * @param {string} outputDirectory
 */
export const resetFile = (fileName, outputDirectory) =>
  fs.writeFileSync(path.join(outputDirectory, fileName), '', 'utf-8');

/**
 * Reads the file contents.
 *
 * @param {string} path
 * @returns {string} The contents of a file
 */
export const readFile = (entry) => fs.readFileSync(path.resolve(__dirname, '../', entry), 'utf-8');

/**
 * append content to a file
 *
 * @param {string} content
 * @param {string} fileName
 * @param {string} outputDirectory
 */
export const appendFile = (content, fileName, outputDirectory) =>
  fs.appendFileSync(path.join(outputDirectory, fileName), content, 'utf-8');

/**
 * writes content to a file
 *
 * @param {string} content
 * @param {string} fileName
 * @param {string} outputDirectory
 */
export const writeFile = (content, fileName, outputDirectory) =>
  fs.writeFileSync(path.join(outputDirectory, fileName), content, 'utf-8');

/**
 * writes content to a file if it does not exist
 *
 * @param {string} content
 * @param {string} fileName
 * @param {string} outputDirectory
 */
export const writeFileIfNotExists = (content, fileName, outputDirectory) => {
  if (!fs.existsSync(path.join(outputDirectory, fileName))) {
    writeFile(content, fileName, outputDirectory);
  }
};

/**
 * Reads metadata from the icons/categories directories
 *
 * @param {string} directory
 * @returns {object} A map of icon or category metadata
 */
export const readAllMetadata = (directory) =>
  fs
    .readdirSync(directory)
    .filter((file) => path.extname(file) === '.json')
    .reduce((acc, fileName, i) => {
      acc[path.basename(fileName, '.json')] = readMetadata(fileName, directory);
      return acc;
    }, {});

/**
 * Reads metadata for an icon or category
 *
 * @param {string} fileName
 * @param {string} directory
 * @returns {object} The metadata for the icon or category
 */
export const readMetadata = (fileName, directory) =>
  JSON.parse(fs.readFileSync(path.join(directory, fileName), 'utf-8'));

/**
 * reads the icon directory
 *
 * @param {string} directory
 * @returns {array} An array of file paths containing svgs
 */
export const readSvgDirectory = (directory, fileExtension = '.svg') =>
  fs.readdirSync(directory).filter((file) => path.extname(file) === fileExtension);

/**
 * Read svg from directory
 *
 * @param {string} fileName
 * @param {string} directory
 */
export const readSvg = (fileName, directory) =>
  fs.readFileSync(path.join(directory, fileName), 'utf-8');

/**
 * writes content to a file
 *
 * @param {string} fileName
 * @param {string} outputDirectory
 * @param {string} content
 */
export const writeSvgFile = (fileName, outputDirectory, content) =>
  fs.writeFileSync(path.join(outputDirectory, fileName), content, 'utf-8');

/**
 * djb2 hashing function
 *
 * @param {string} string
 * @param {number} seed
 * @returns {string} A hashed string of 6 characters
 */
export const hash = (string, seed = 5381) => {
  let i = string.length;

  while (i) {
    // eslint-disable-next-line no-bitwise, no-plusplus
    seed = (seed * 33) ^ string.charCodeAt(--i);
  }

  // eslint-disable-next-line no-bitwise
  return (seed >>> 0).toString(36).substr(0, 6);
};

/**
 * Generate Hashed string based on name and attributes
 *
 * @param {object} seed
 * @param {string} seed.name A name, for example an icon name
 * @param {object} seed.attributes An object of SVGElement Attrbutes
 * @returns {string} A hashed string of 6 characters
 */
export const generateHashedKey = ({ name, attributes }) => hash(JSON.stringify([name, attributes]));

/**
 * Checks if array of items contains duplicated items
 *
 * @param {array} children an array of items
 * @returns {Boolean} if items contains duplicated items.
 */
export const hasDuplicatedChildren = (children) => {
  const hashedKeys = children.map(generateHashedKey);

  return !hashedKeys.every(
    (key, index) => index === hashedKeys.findIndex((childKey) => childKey === key),
  );
};

/**
 * @param {array} a
 * @param {array} b
 * @returns {array}
 */
export const mergeArrays = (a, b) => {
  a = a.concat(b);
  a = a.filter((i, p) => a.indexOf(i) === p);
  return a;
};

/**
 * @param {string} currentPath
 * @returns {string}
 */
export const getCurrentDirPath = (currentPath) => path.dirname(fileURLToPath(currentPath));

/**
 * @param {array} array
 * @returns {array}
 */
export const shuffle = (array) => {
  // eslint-disable-next-line no-plusplus
  for (let i = array.length - 1; i > 0; i--) {
    const j = Math.floor(Math.random() * (i + 1));
    [array[i], array[j]] = [array[j], array[i]];
  }
  return array;
};

/**
 * Minifies SVG
 *
 * @param {string} string
 * @returns string
 */
export function minifySvg(string){
  return string ? string
    .replace(/\>[\r\n ]+</g, "><")
    .replace(/(<.*?>)|\s+/g, (m, $1) => $1 || ' ')
    .trim()
    : ""
}