import chalk from 'chalk';
import {execSync} from 'child_process';
import {copyFileSync, existsSync, lstatSync, PathLike, readdirSync, readFileSync} from 'fs';
import {join, resolve, sep} from 'path';
import {satisfies, valid} from 'semver';
import {isDeepStrictEqual} from 'util';
import {parse, stringify} from 'yaml';

/**
 * Configuration for the configuration check
 */
export interface Configuration {
  /**
   * Whether or not the project is meant to be packaged
   */
  forPackaging: boolean;
  /**
   * Whether or not the project has a CLI
   */
  hasCli: boolean;
  /**
   * A list of CI entries to ignore while checking
   */
  ignoreCiEntries: string[];
  /**
   * A list of script names to ignore while checking
   */
  ignoreScripts: string[];
  /**
   * Whether or not the project is meant to be executed server side
   */
  serverSide: boolean;
  /**
   * Whether or not the standard build procedure is meant to be used
   */
  standardBuild: boolean;
  /**
   * Whether or not the standard documentation procedure is meant to be used
   */
  standardDocumentation: boolean;
}

/**
 * Rules for the configuration check
 */
export interface Rules {
  /**
   * Expected CI config
   */
  ciConfig: any;
  /**
   * Expected dependencies
   */
  dependencies: string[];
  /**
   * Expected dev dependencies
   */
  devDependencies: string[];
  /**
   * Expected files
   */
  files: string[];
  /**
   * Expected licenses
   */
  licenses: string[];
  /**
   * Expected NYC configuration
   */
  nycConfiguration: any;
  /**
   * Expected scripts
   */
  scripts: { [k: string]: string; };
}

/**
 * Wrapper for console.info that outputs every argument in cyan
 *
 * @param args Arguments to output
 */
export function consoleInfo(...args: string[]): void {
  args.forEach((arg) => {
    /* tslint:disable-next-line:no-console */
    console.info('\n' + chalk.cyan(arg));
  });
}

/**
 * Wrapper for console.warn that outputs every argument in red
 *
 * @param args Arguments to output
 */
export function consoleWarn(...args: string[]): void {
  args.forEach((arg) => {
    const lines = arg.split('\n');
    /* tslint:disable-next-line:no-console */
    console.warn('\n' + chalk.red.bold(lines[0]));
    for (const line of lines.slice(1)) {
      /* tslint:disable-next-line:no-console */
      console.info(line);
    }
  });
}

/**
 * Wrapper for console.log that outputs every argument in green
 *
 * @param args Arguments to output
 */
export function consoleLog(...args: string[]): void {
  args.forEach((arg) => {
    /* tslint:disable-next-line:no-console */
    console.log('\n' + chalk.green.bold(arg));
  });
}

/**
 * Check dependencies are installed
 *
 * @param rules Rules for check
 * @param packageJson package.json to check dependencies in
 */
export function checkDependencies(rules: Rules, packageJson: any): void {
  for (const dependency of rules.dependencies) {
    const [name, version] = dependency.split(':');
    const installedVersion = packageJson.dependencies[name];

    if (typeof packageJson.dependencies === 'undefined' || typeof packageJson.dependencies[name] === 'undefined') {
      consoleWarn(`Dependency '${name}' is missing.
Please install with 'npm install --save-exact ${name}'.`);
    } else if (
      typeof version !== 'undefined'
      && valid(version)
      && !satisfies(installedVersion, version)
    ) {
      consoleWarn(
        `Version '${installedVersion}' of dependency '${name} does not satisfy constraint '${version}'.`,
      );
    }
  }

  for (const devDependency of rules.devDependencies) {
    const [name, version] = devDependency.split(':');
    const installedVersion = packageJson.dependencies[name];

    if (
      typeof packageJson.dependencies === 'undefined' || typeof packageJson.dependencies[name] === 'undefined'
      && typeof packageJson.devDependencies === 'undefined' || typeof packageJson.devDependencies[name] === 'undefined'
    ) {
      consoleWarn(`Dev dependency '${name}' is missing.
Please install with 'npm install --save-exact --save-dev ${name}'.`);
    } else if (
      typeof version !== 'undefined'
      && valid(version)
      && !satisfies(installedVersion, version)
    ) {
      consoleWarn(
        `Version '${installedVersion}' of dev dependency '${name} does not satisfy constraint '${version}'.`,
      );
    }
  }
}

/**
 * Check that configuration files are extended
 *
 * @param path Path, where configuration files are located
 */
export function checkConfigurationFilesAreExtended(path: string): void {
  // 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))}`);
      }
    }
  });
}

/**
 * Check needed files
 *
 * @param rules Rules for check
 * @param path Path to files to check
 * @param replaceFlag Whether or not to replace files
 * @return Whether or not overwrite is suggested
 */
export function checkNeededFiles(rules: Rules, path: string, replaceFlag: boolean): boolean {
  let suggestOverwrite = false;

  // copy needed files
  rules.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) || replaceFlag) {
      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;
      }
    }
  });

  return suggestOverwrite;
}

/**
 * Check licenses
 *
 * @param rules Rules for check
 * @param packageJson package.json to check license in
 */
export function checkLicenses(rules: Rules, packageJson: any): void {
  // check if license is one of the expected ones
  if (rules.licenses.indexOf(packageJson.license) === -1) {
    consoleWarn(`License should be one of '${rules.licenses.join(', ')}'!`);
  }
}

/**
 * Check NYC configuration
 *
 * @param rules Rules for check
 * @param packageJson package.json to check NYC configuration in
 * @param replaceFlag Whether or not to replace NYC configuration
 * @return Whether or not package.json was changed and if overwrite is suggested
 */
export function checkNYCConfiguration(rules: Rules, packageJson: any, replaceFlag: boolean): [boolean, boolean] {
  let packageJsonChanged = false;
  let suggestOverwrite = false;

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

      packageJsonChanged = true;

      consoleLog(`Added NYC configuration in to 'package.json'.`);
    } else if (!isDeepStrictEqual(packageJson.nyc, rules.nycConfiguration)) {
      consoleInfo(`NYC configuration in 'package.json' differs from the proposed one. Please check manually.`);

      suggestOverwrite = true;
    }
  }

  return [packageJsonChanged, suggestOverwrite];
}

/**
 * Check scripts
 *
 * @param rules Rules for check
 * @param packageJson package.json to check scripts in
 * @param replaceFlag Whether or not to replace scripts
 * @return Whether or not the package.json was changed
 */
export function checkScripts(rules: Rules, packageJson: any, replaceFlag: boolean): boolean {
  let packageJsonChanged = false;

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

    packageJsonChanged = true;
  }

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

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

      packageJsonChanged = true;

      consoleInfo(`Added '${scriptName}' script to 'package.json'.`);
    } else if (typeof scriptToCheck === 'string' && scriptToCheck !== rules.scripts[scriptName]) {
      consoleWarn(`Script '${scriptName}' in 'package.json' should be:
'${rules.scripts[scriptName].replace('\n', '\\n')}'.`);
    }
  });

  return packageJsonChanged;
}

/**
 * Check contributors
 *
 * @param path Path to directory
 * @param packageJson package.json to check contributors in
 */
export function checkContributors(path: PathLike, packageJson: any): void {
  const execBuffer = execSync(`git --git-dir=${path}/.git --work-tree=${path} 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
 *
 * @param rules Rules for check
 * @param path Path to CI config
 */
export function checkCIConfig(rules: Rules, path: string): void {
// 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 rules.ciConfig) {
        if (!rules.ciConfig.hasOwnProperty(entry)) {
          continue;
        }

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

/**
 * Check copyright years in files
 *
 * @param path Path to project root
 * @param subDir Subordinated directory to examine
 */
export function checkCopyrightYears(path: PathLike, subDir: PathLike): void {
  const fileSystemObjects = readdirSync(resolve(path.toString(), subDir.toString()));

  for (const fileSystemObject of fileSystemObjects) {
    const fileSystemObjectPath = resolve(path.toString(), subDir.toString(), fileSystemObject);

    // tslint:disable-next-line:max-line-length
    const execBuffer = execSync(`git --git-dir=${path}/.git --work-tree=${path} log --oneline --format='%cI' -- ${fileSystemObjectPath}`);

    const seen: number[] = [];
    const changedYears = execBuffer
      .toString()
      .split('\n')
      .map((date) => parseInt(date.split('-')[0], 10))
      .filter((year) => {
        if (seen.indexOf(year) >= 0 || !year.toString().match(/[0-9]{4}/)) {
          return false;
        }

        seen.push(year);
        return true;
      })
      .sort();

    const fileStats = lstatSync(fileSystemObjectPath);

    if (fileStats.isFile()) {
      const content = readFileSync(fileSystemObjectPath).toString().split('\n');

      let copyrightYearsString: string = '';
      for (const line of content) {
        const match = line.match(/^ \* Copyright \(C\) ([0-9\-,\s]*) StApps$/);

        if (Array.isArray(match) && match.length === 2) {
          copyrightYearsString = match[1];
        }
      }

      if (copyrightYearsString === '') {
        consoleWarn(`Copyright line for file '${fileSystemObjectPath}' could not be found!`);
      } else {
        const copyrightYearsWithIntervals = copyrightYearsString.split(',').map((year) => year.trim());
        const copyrightYears: number[] = [];

        for (const copyrightYear of copyrightYearsWithIntervals) {
          if (copyrightYear.indexOf('-') >= 0) {
            const [startString, endString] = copyrightYear.split('-');
            const start = parseInt(startString.trim(), 10);
            const end = parseInt(endString.trim(), 10);
            for (let year = start; year <= end; year++) {
              copyrightYears.push(year);
            }
          } else {
            copyrightYears.push(parseInt(copyrightYear, 10));
          }
        }

        for (const copyrightYear of copyrightYears) {
          const idx = changedYears.indexOf(copyrightYear);

          if (idx >= 0) {
            changedYears.splice(idx, 1);
          } else {
            // tslint:disable-next-line:max-line-length
            consoleWarn(`File '${join(subDir.toString(), fileSystemObject)}' wrongly states '${copyrightYear}' as year in the copyright line.`);
          }
        }

        if (changedYears.length > 0) {
          // tslint:disable-next-line:max-line-length
          consoleWarn(`File '${join(subDir.toString(), fileSystemObject)}' is missing '${changedYears.join(', ')}' as year(s) in the copyright line.`);
        }
      }
    } else if (fileStats.isDirectory()) {
      checkCopyrightYears(path, join(subDir.toString(), fileSystemObject));
    }
  }
}

/**
 * Get configuration
 *
 * @param packageJson package.json to get configuration from
 */
export function getConfiguration(packageJson: any): Configuration {
  const defaultConfiguration: Configuration = {
    forPackaging: true,
    hasCli: true,
    ignoreCiEntries: [],
    ignoreScripts: [],
    serverSide: true,
    standardBuild: true,
    standardDocumentation: true,
  };

  if (typeof packageJson.openstappsConfiguration !== 'undefined') {
    return {
      ...defaultConfiguration,
      ...packageJson.openstappsConfiguration,
    };
  }

  return defaultConfiguration;
}

/**
 * Get rules for check
 *
 * @param configuration Configuration for check
 */
export function getRules(configuration: Configuration): Rules {
  // expected dependencies
  const dependencies: string[] = [];

  // expected dev dependencies
  const devDependencies = [
    'conventional-changelog-cli',
    'tslint',
    'typescript:^3.4.0',
  ];

  // files that need to be copied
  const files = [
    '.editorconfig',
    join('templates', '.gitignore'),
    join('templates', 'tsconfig.json'),
    join('templates', 'tslint.json'),
  ];

  // configuration for nyc to add to package.json
  const nycConfiguration = {
    all: true,
    branches: 95,
    'check-coverage': true,
    exclude: [
      'src/cli.ts',
    ],
    extension: [
      '.ts',
    ],
    functions: 95,
    include: [
      'src',
    ],
    lines: 95,
    'per-file': true,
    reporter: [
      'html',
      'text-summary',
    ],
    statements: 95,
  };

  // expected scripts
  const scripts: { [k: string]: string; } = {
    /* tslint:disable-next-line:max-line-length */
    'changelog': 'conventional-changelog -p angular -i CHANGELOG.md -s -r 0 && git add CHANGELOG.md && git commit -m \'docs: update changelog\'',
    'check-configuration': 'openstapps-configuration',
  };

  // list of expected licenses
  const licenses = [
    'AGPL-3.0-only',
    'GPL-3.0-only',
  ];

  // expected values in CI config
  const ciConfig: { [k: string]: any; } = {
    /* tslint:disable:object-literal-sort-keys */
    image: 'registry.gitlab.com/openstapps/projectmanagement/node',
    cache: {
      key: '${CI_COMMIT_REF_SLUG}',
      paths: [
        'node_modules',
      ],
    },
    build: {
      stage: 'build',
      script: [
        'npm run build',
      ],
      artifacts: {
        paths: [
          'lib',
        ],
      },
    },
    audit: {
      allow_failure: true,
      except: [
        'schedules',
      ],
      script: [
        'npm audit',
      ],
      stage: 'test',
    },
    'scheduled-audit': {
      only: [
        'schedules',
      ],
      script: [
        'npm audit',
      ],
      stage: 'test',
    },
    package: {
      dependencies: [
        'build',
      ],
      tags: [
        'secrecy',
      ],
      stage: 'deploy',
      script: [
        'echo "//registry.npmjs.org/:_authToken=$NPM_AUTH_TOKEN" > /root/.npmrc',
        'npm publish',
      ],
      only: [
        '/^v[0-9]+\.[0-9]+\.[0-9]+$/',
      ],
      artifacts: {
        paths: [
          'public',
        ],
      },
    },
    pages: {
      artifacts: {
        'paths': [
          'public',
        ],
      },
      only: [
        '/^v[0-9]+\\.[0-9]+\\.[0-9]+$/',
      ],
      script: [
        'npm run documentation',
        'mv docs public',
      ],
      stage: 'deploy',
    },
    /* tslint:enable */
  };

  for (const ignoreCiEntry of configuration.ignoreCiEntries) {
    delete ciConfig[ignoreCiEntry];
  }

  if (configuration.forPackaging) {
    scripts.prepublishOnly = 'npm ci && npm run build';

    files.push(
      join('templates', '.npmignore'),
    );
  }

  if (configuration.serverSide) {
    dependencies.push('@types/node:^10.0.0');
  }

  if (configuration.standardBuild || configuration.hasCli) {
    scripts.build = 'npm run tslint && npm run compile';
    scripts.compile = 'rimraf lib && tsc';
    devDependencies.push('rimraf');

    if (configuration.hasCli) {
      devDependencies.push('prepend-file-cli');
      scripts.compile += ' && prepend lib/cli.js \'#!/usr/bin/env node\n\'';
    }
  }

  if (configuration.standardDocumentation) {
    devDependencies.push('typedoc');
    /* tslint:disable-next-line:max-line-length */
    scripts.documentation = 'typedoc --includeDeclarations --mode modules --out docs --readme README.md --listInvalidSymbolLinks src';
  }

  for (const ignoreScript of configuration.ignoreScripts) {
    consoleInfo(`Ignoring script '${ignoreScript}'.`);
    delete scripts[ignoreScript];
  }

  return {
    ciConfig,
    dependencies,
    devDependencies,
    files,
    licenses,
    nycConfiguration,
    scripts,
  };
}