import path from 'path';
import fs from 'fs';

// deleteCustomerUsingDELETE -> MutationDeleteCustomerUsingDeleteArgs
export function getArgsStringFromOperationId(operationId: string, method: string): string {
  const prefix = method.toLowerCase() === 'get' ? 'Query' : 'Mutation';
  let prevChar: string = '';
  return (
    prefix +
    operationId.split('').reduce((result: string, char, index) => {
      if (index === 0) return char.toUpperCase();
      if (/[A-Z]/.test(prevChar) && /[A-Z]/.test(char)) result += char.toLowerCase();
      else result += char;
      prevChar = char;
      return result;
    }, '') +
    'Args'
  );
}

export function indent(str: string, count = 1): string {
  return new Array(count).fill('  ').join('') + str;
}

// "../generated/HeroesApi.ts" 파일에서 "../generated/types1.ts" 파일의 상대경로는 "./types1"
export function getRelativePath(from: string, to: string, ext: string = '.ts'): string {
  const targetFileName = path.basename(to, ext);
  let relativePath = path.relative(path.dirname(from), path.dirname(to));
  if (relativePath === '') relativePath = '.';
  if (targetFileName === 'index') return relativePath;
  return `${relativePath}/${targetFileName}`
}

export function getInstanceNameFromClass(className: string): string {
  if (!className) throw new Error('[getInstanceNameFromClass] className can not be empty string or undefined!');
  return className[0].toLowerCase() + className.substring(1);
}

export function checkUrlForm(strUrl: string): boolean {
  var expUrl = /^http[s]?\:\/\//i;
  return expUrl.test(strUrl);
}

export function writeFiles(paths: string[], strs: string[]) {
  const currentDir = process.cwd();
  for (let i=0; i<paths.length; i++) {
    fs.writeFile(path.join(currentDir, paths[i]), strs[i], () => {
      console.info(`[${path.join(currentDir, paths[i])}] was generated!`);
    });
  }
}

export const replaceOddChars = (str: string): string => str.replace(/[^_a-zA-Z0-9]/g, '_');

export const getGQLTypeNameFromURL = (method: string, url: string): string => {
  const fromUrl = replaceOddChars(url.replace(/[{}]+/g, ''));
  return `${method}${fromUrl}`;
};