import inquirer, { Question } from 'inquirer';

import { ModuleConfiguration } from './ModuleConfiguration';

/**
 * Generates CocoaPod name in format `Namepart1Namepart2Namepart3`.
 * For these with `expo` as `partname1` would generate `EXNamepart2...`.
 * @param {string} moduleName - provided module name, expects format: `namepart1-namepart2-namepart3`
 */
const generateCocoaPodDefaultName = (moduleName: string) => {
  const wordsToUpperCase = (s: string) =>
    s
      .toLowerCase()
      .split('-')
      .map((s) => s.charAt(0).toUpperCase() + s.substring(1))
      .join('');

  if (moduleName.toLowerCase().startsWith('expo')) {
    return `EX${wordsToUpperCase(moduleName.substring(4))}`;
  }
  return `EX${wordsToUpperCase(moduleName)}`;
};

/**
 * Generates java package name in format `namepart1.namepart2.namepart3`.
 * @param moduleName - provided module name, expects format: `namepart1-namepart2-namepart3`
 */
const generateJavaModuleDefaultName = (moduleName: string) => {
  const wordsToJavaModule = (s: string) => s.toLowerCase().split('-').join('');

  if (moduleName.toLowerCase().startsWith('expo')) {
    return `expo.modules.${wordsToJavaModule(moduleName.substring(4))}`;
  }
  return wordsToJavaModule(moduleName);
};

/**
 * Generates JS/TS module name in format `Namepart1Namepart2Namepart3`.
 * @param moduleName - provided module name, expects format: `namepart1-namepart2-namepart3`
 */
const generateInCodeModuleDefaultName = (moduleName: string) => {
  return moduleName
    .toLowerCase()
    .split('-')
    .map((s) => s.charAt(0).toUpperCase() + s.substring(1))
    .join('');
};

/**
 * Generates questions
 */
const generateQuestions = (suggestedModuleName: string): Question[] => [
  {
    name: 'npmModuleName',
    message: 'How would you like to call your module in JS/npm? (eg. expo-camera)',
    default: suggestedModuleName,
    validate: (answer: string) => {
      return !answer.length
        ? 'Module name cannot be empty'
        : /[A-Z]/.test(answer)
        ? 'Module name cannot contain any upper case characters'
        : /\s/.test(answer)
        ? 'Module name cannot contain any whitespaces'
        : true;
    },
  },
  {
    name: 'podName',
    message: 'How would you like to call your module in CocoaPods? (eg. EXCamera)',
    default: ({ npmModuleName }) => generateCocoaPodDefaultName(npmModuleName),
    validate: (answer: string) =>
      !answer.length
        ? 'CocoaPod name cannot be empty'
        : /\s/.test(answer)
        ? 'CocoaPod name cannot contain any whitespaces'
        : true,
  },
  {
    name: 'javaPackage',
    message: 'How would you like to call your module in Java? (eg. expo.modules.camera)',
    default: ({ npmModuleName }) => generateJavaModuleDefaultName(npmModuleName),
    validate: (answer: string) =>
      !answer.length
        ? 'Java Package name cannot be empty'
        : /\s/.test(answer)
        ? 'Java Package name cannot contain any whitespaces'
        : true,
  },
  {
    name: 'jsPackageName',
    message: 'How would you like to call your module in JS/TS codebase (eg. ExpoCamera)?',
    default: ({ npmModuleName }) => generateInCodeModuleDefaultName(npmModuleName),
    validate: (answer: string) =>
      !answer.length
        ? 'Module name cannot be empty'
        : /\s/.test(answer)
        ? 'Module name cannot contain any whitespaces'
        : true,
  },
  {
    name: 'viewManager',
    message: 'Would you like to create a NativeViewManager?',
    default: false,
    type: 'confirm',
  },
];

/**
 * Prompt user about new module namings.
 * @param suggestedModuleName - suggested module name that would be used to generate all suggestions for each question
 */
export default async function promptQuestionsAsync(
  suggestedModuleName: string
): Promise<ModuleConfiguration> {
  const questions = generateQuestions(suggestedModuleName);
  // non interactive check
  if (!process.stdin.isTTY) {
    let message = `Input is required, but expotools is in a non-interactive shell.\n`;
    const firstQuestion = (questions[0].message || '') as string;
    message += `Required input:\n${firstQuestion.trim().replace(/^/gm, '> ')}`;
    throw new Error(message);
  }
  // TODO: Migrate to prompts and remove inquirer
  return (await inquirer.prompt(questions)) as ModuleConfiguration;
}