/*
 * Copyright (C) 2018, 2019 StApps
 * This program is free software: you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published by the Free
 * Software Foundation, version 3.
 *
 * This program is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
 * more details.
 *
 * You should have received a copy of the GNU General Public License along with
 * this program. If not, see <https://www.gnu.org/licenses/>.
 */
import chalk from 'chalk';
import {execSync} from 'child_process';
import * as commander from 'commander';
import {copyFileSync, existsSync, readFileSync, writeFileSync} from 'fs';
import {join, resolve, sep} from 'path';
import {cwd} from 'process';
import {isDeepStrictEqual} from 'util';
import {parse, stringify} from 'yaml';
import {EXPECTED_CI_CONFIG, EXPECTED_LICENSES, NEEDED_FILES, NYC_CONFIGURATION, SCRIPTS} from './configuration';

/* tslint:disable:no-console */

/**
 * Wrapper for console.info that outputs every argument in cyan
 * @param args
 */
function consoleInfo(...args: string[]): void {
  args.forEach((arg) => {
    console.info('\n' + chalk.cyan(arg));
  });
}

/**
 * Wrapper for console.warn that outputs every argument in red
 * @param args
 */
function consoleWarn(...args: string[]): void {
  args.forEach((arg) => {
    console.warn('\n' + chalk.red.bold(arg));
  });
}

/**
 * Wrapper for console.log that outputs every argument in green
 * @param args
 */
function consoleLog(...args: string[]): void {
  args.forEach((arg) => {
    console.log('\n' + chalk.green.bold(arg));
  });
}

const currentWorkingDirectory = cwd();

let suggestOverwrite = false;

// configure commander
commander
  .version(JSON.parse(readFileSync(resolve(__dirname, '..', 'package.json')).toString()).version)
  .option('-p, --path <path>', `Path of project to add files to (${currentWorkingDirectory})`, currentWorkingDirectory)
  .option('-r, --replace', 'Whether to replace existing files or not', false)
  .parse(process.argv);

// make path absolute
const path = resolve(commander.path);

// check for existing package.json in provided path
if (!existsSync(resolve(path, 'package.json'))) {
  throw new Error(`No package.json in "${path}".`);
}

// path to examined package.json
const packageJsonPath = resolve(path, 'package.json');

// wheter or not the contents of the package.json were changed
let packageJsonChanged = false;

// read package.json in provided path
const packageJson = JSON.parse(readFileSync(packageJsonPath).toString());

// check if provided path is this package
if (packageJson.name === '@openstapps/configuration') {
  consoleInfo('I\'m not going to check myself!');
  process.exit(0);
}

// check if license is one of the expected ones
if (EXPECTED_LICENSES.indexOf(packageJson.license) === -1) {
  consoleWarn(`License should be one of "${EXPECTED_LICENSES.join(', ')}"!`);
}

// check if configuration files are extended
['tsconfig.json', 'tslint.json'].forEach((file) => {
  const fileToCheck = resolve(path, file);
  const expectedPath = `./node_modules/@openstapps/configuration/${file}`;

  if (existsSync(fileToCheck)) {
    const configFile = JSON.parse(readFileSync(fileToCheck).toString());

    const configFileExtended =
      (typeof configFile.extends === 'string' && configFile.extends === expectedPath)
      || (file === 'tslint.json' && Array.isArray(configFile.extends) && configFile.extends.indexOf(expectedPath) >= 0);

    if (!configFileExtended) {
      consoleWarn(`
File "${fileToCheck}" should extend "${expectedPath}"!

Example:
${readFileSync(resolve(__dirname, '..', 'templates', 'template-' + file))}`);
    }
  }
});

// copy needed files
NEEDED_FILES.forEach((file) => {
  let destinationFile = file;

  // remove templates directory for destination files
  if (destinationFile.indexOf('templates') === 0) {
    destinationFile = destinationFile.split(sep).slice(1).join(sep);
    file = join('templates', `template-${destinationFile}`);
  }

  const source = resolve(__dirname, '..', file);
  const destination = resolve(path, destinationFile);

  // check if file exists or replace flag is set
  if (!existsSync(destination) || commander.replace) {
    copyFileSync(source, destination);
    consoleInfo(`Copied file "${source}" to "${destination}".`);
  } else if (destinationFile === '.npmignore') {
    const npmIgnore = readFileSync(destination).toString();

    const ignoredPatterns = npmIgnore.split('\n');

    let ignoresEverything = false;
    let unignoresDocs = false;

    for (const ignoredPattern of ignoredPatterns) {
      if (ignoredPattern === '/*') {
        ignoresEverything = true;
      }

      if (ignoredPattern === '!docs') {
        unignoresDocs = true;
      }
    }

    if (!ignoresEverything) {
      consoleWarn(`'.npmignore' should have '/*' as first pattern to ignore everything.`);

      suggestOverwrite = true;
    }

    if (unignoresDocs) {
      consoleWarn(`'.npmignore' contains '!docs' and thus the package will contain the documentation.
Please double check that this is desired behavior since the docs can become huge:
https://gitlab.com/openstapps/configuration/issues/11`);

      suggestOverwrite = true;
    }
  }
});

// check if nyc is a dependency
if (typeof packageJson.devDependencies === 'object' && Object.keys(packageJson.devDependencies).indexOf('nyc') >= 0) {
  if (typeof packageJson.nyc === 'undefined' || commander.replace) {
    // add NYC configuration
    packageJson.nyc = NYC_CONFIGURATION;

    packageJsonChanged = true;

    consoleLog(`Added NYC configuration in "${packageJsonPath}".`);
  } else if (!isDeepStrictEqual(packageJson.nyc, NYC_CONFIGURATION)) {
    consoleInfo(`NYC configuration in '${packageJsonPath}' differs from the proposed one. Please check manually...`);

    suggestOverwrite = true;
  }
}

// check if scripts is a map
if (typeof packageJson.scripts !== 'object') {
  packageJson.scripts = {};

  packageJsonChanged = true;
}

Object.keys(SCRIPTS).forEach((scriptName) => {
  const scriptToCheck = packageJson.scripts[scriptName];

  // check if script exists
  if (typeof scriptToCheck === 'undefined' || commander.replace) {
    packageJson.scripts[scriptName] = SCRIPTS[scriptName];

    packageJsonChanged = true;

    consoleInfo(`Added '${scriptName}' script to '${packageJsonPath}'.`);
  } else if (typeof scriptToCheck === 'string' && scriptToCheck !== SCRIPTS[scriptName]) {
    consoleWarn(`NPM script '${scriptName}' should be "${SCRIPTS[scriptName].replace('\n', '\\n')}".`);
  }
});

const execBuffer = execSync('git log --format=\'%aN\' | sort -u');
for (let author of execBuffer.toString().split('\n')) {
  author = author.trim();

  if (author === '') {
    continue;
  }

  let authorIsAttributed = false;

  authorIsAttributed = authorIsAttributed
    || (typeof packageJson.author === 'string' && packageJson.author.indexOf(author) >= 0)
    || (Array.isArray(packageJson.contributors) && packageJson.contributors.find((contributor: string) => {
      return contributor.indexOf(author) >= 0;
    }));

  if (!authorIsAttributed) {
    consoleWarn(`'${author}' should be attributed as author or contributor.`);
  }
}

// check CI config if it exists
const pathToCiConfig = resolve(path, '.gitlab-ci.yml');
if (existsSync(pathToCiConfig)) {
  // read CI config
  const buffer = readFileSync(pathToCiConfig);
  try {
    const ciConfig = parse(buffer.toString());

    // check entries
    for (const entry in EXPECTED_CI_CONFIG) {
      if (!EXPECTED_CI_CONFIG.hasOwnProperty(entry)) {
        continue;
      }

      if (!isDeepStrictEqual(EXPECTED_CI_CONFIG[entry], ciConfig[entry])) {
        consoleWarn(`Entry '${entry}' in ${pathToCiConfig} is incorrect. Expected value is:`);
        consoleInfo(stringify((() => {
          const completeEntry: any = {};
          completeEntry[entry] = EXPECTED_CI_CONFIG[entry];
          return completeEntry;
        })()));
      }
    }
  } catch (error) {
    consoleWarn(`Could not parse ${pathToCiConfig} because of '${error.message}'.
Please ensure consistency of CI config manually.`);
    consoleInfo(stringify(EXPECTED_CI_CONFIG));
  }
}

if (packageJsonChanged) {
  writeFileSync(resolve(path, 'package.json'), JSON.stringify(packageJson, null, 2));
  consoleLog(`Changes were written to "${packageJsonPath}".`);
}

if (suggestOverwrite) {
  consoleInfo(`You should consider to overwrite your configuration files and check for intended derivations:
npm run check-configuration -- -r`);
}

consoleLog(`Done checking the configuration in '${path}'.`);