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/* @flow */
"use strict";

const _ = require("lodash");
const createStylelint = require("./createStylelint");
const createStylelintResult = require("./createStylelintResult");
const debug = require("debug")("stylelint:standalone");
const FileCache = require("./utils/FileCache");
const filterFilePaths = require("./utils/filterFilePaths");
const formatters = require("./formatters");
const fs = require("fs");
const getFormatterOptionsText = require("./utils/getFormatterOptionsText");
const globby /*: Function*/ = require("globby");
const hash = require("./utils/hash");
const ignore = require("ignore");
const needlessDisables /*: Function*/ = require("./needlessDisables");
const NoFilesFoundError = require("./utils/noFilesFoundError");
const path = require("path");
const pify = require("pify");
const pkg = require("../package.json");
const writeFileAtomic /*: Function*/ = require("./vendor/writeFileAtomic");

const DEFAULT_IGNORE_FILENAME = ".stylelintignore";
const FILE_NOT_FOUND_ERROR_CODE = "ENOENT";
const ALWAYS_IGNORED_GLOBS = ["**/node_modules/**", "**/bower_components/**"];

module.exports = function(
  options /*: stylelint$standaloneOptions */
) /*: Promise<stylelint$standaloneReturnValue>*/ {
  const cacheLocation = options.cacheLocation;
  const code = options.code;
  const codeFilename = options.codeFilename;
  const config = options.config;
  const configBasedir = options.configBasedir;
  const configFile = options.configFile;
  const configOverrides = options.configOverrides;
  const customSyntax = options.customSyntax;
  const globbyOptions = options.globbyOptions;
  const files = options.files;
  const fix = options.fix;
  const formatter = options.formatter;
  const ignoreDisables = options.ignoreDisables;
  const reportNeedlessDisables = options.reportNeedlessDisables;
  const maxWarnings = options.maxWarnings;
  const syntax = options.syntax;
  const allowEmptyInput = options.allowEmptyInput || false;
  const useCache = options.cache || false;
  let fileCache;
  const startTime = Date.now();

  // The ignorer will be used to filter file paths after the glob is checked,
  // before any files are actually read
  const ignoreFilePath = options.ignorePath || DEFAULT_IGNORE_FILENAME;
  const absoluteIgnoreFilePath = path.isAbsolute(ignoreFilePath)
    ? ignoreFilePath
    : path.resolve(process.cwd(), ignoreFilePath);
  let ignoreText = "";

  try {
    ignoreText = fs.readFileSync(absoluteIgnoreFilePath, "utf8");
  } catch (readError) {
    if (readError.code !== FILE_NOT_FOUND_ERROR_CODE) throw readError;
  }

  const ignorePattern = options.ignorePattern || [];
  const ignorer = ignore()
    .add(ignoreText)
    .add(ignorePattern);

  const isValidCode = typeof code === "string";

  if ((!files && !isValidCode) || (files && (code || isValidCode))) {
    throw new Error(
      "You must pass stylelint a `files` glob or a `code` string, though not both"
    );
  }

  let formatterFunction;

  if (typeof formatter === "string") {
    formatterFunction = formatters[formatter];

    if (formatterFunction === undefined) {
      return Promise.reject(
        new Error(
          `You must use a valid formatter option: ${getFormatterOptionsText()} or a function`
        )
      );
    }
  } else if (typeof formatter === "function") {
    formatterFunction = formatter;
  } else {
    formatterFunction = formatters.json;
  }

  const stylelint = createStylelint({
    config,
    configFile,
    configBasedir,
    configOverrides,
    ignoreDisables,
    reportNeedlessDisables,
    syntax,
    customSyntax,
    fix
  });

  if (!files) {
    const absoluteCodeFilename =
      codeFilename !== undefined && !path.isAbsolute(codeFilename)
        ? path.join(process.cwd(), codeFilename)
        : codeFilename;

    // if file is ignored, return nothing
    if (
      absoluteCodeFilename &&
      !filterFilePaths(ignorer, [
        path.relative(process.cwd(), absoluteCodeFilename)
      ]).length
    ) {
      return Promise.resolve(prepareReturnValue([]));
    }

    return stylelint
      ._lintSource({
        code,
        codeFilename: absoluteCodeFilename
      })
      .then(postcssResult => {
        // Check for file existence
        return new Promise((resolve, reject) => {
          if (!absoluteCodeFilename) {
            reject();

            return;
          }

          fs.stat(absoluteCodeFilename, err => {
            if (err) {
              reject();
            } else {
              resolve();
            }
          });
        })
          .then(() => {
            return stylelint._createStylelintResult(
              postcssResult,
              absoluteCodeFilename
            );
          })
          .catch(() => {
            return stylelint._createStylelintResult(postcssResult);
          });
      })
      .catch(_.partial(handleError, stylelint))
      .then(stylelintResult => {
        const postcssResult = stylelintResult._postcssResult;
        const returnValue = prepareReturnValue([stylelintResult]);

        if (options.fix && postcssResult && !postcssResult.stylelint.ignored) {
          // If we're fixing, the output should be the fixed code
          returnValue.output = postcssResult.root.toString(
            postcssResult.opts.syntax
          );
        }

        return returnValue;
      });
  }

  let fileList = files;

  if (typeof fileList === "string") {
    fileList = [fileList];
  }

  if (!options.disableDefaultIgnores) {
    fileList = fileList.concat(ALWAYS_IGNORED_GLOBS.map(glob => "!" + glob));
  }

  if (useCache) {
    const stylelintVersion = pkg.version;
    const hashOfConfig = hash(
      `${stylelintVersion}_${JSON.stringify(config || {})}`
    );

    fileCache = new FileCache(cacheLocation, hashOfConfig);
  } else {
    // No need to calculate hash here, we just want to delete cache file.
    fileCache = new FileCache(cacheLocation);
    // Remove cache file if cache option is disabled
    fileCache.destroy();
  }

  return globby(fileList, globbyOptions)
    .then(filePaths => {
      // The ignorer filter needs to check paths relative to cwd
      filePaths = filterFilePaths(
        ignorer,
        filePaths.map(p => path.relative(process.cwd(), p))
      );

      if (!filePaths.length) {
        if (!allowEmptyInput) {
          throw new NoFilesFoundError(fileList);
        }

        return Promise.all([]);
      }

      const cwd = _.get(globbyOptions, "cwd", process.cwd());
      let absoluteFilePaths = filePaths.map(filePath => {
        const absoluteFilepath = !path.isAbsolute(filePath)
          ? path.join(cwd, filePath)
          : path.normalize(filePath);

        return absoluteFilepath;
      });

      if (useCache) {
        absoluteFilePaths = absoluteFilePaths.filter(
          fileCache.hasFileChanged.bind(fileCache)
        );
      }

      const getStylelintResults = absoluteFilePaths.map(absoluteFilepath => {
        debug(`Processing ${absoluteFilepath}`);

        return stylelint
          ._lintSource({
            filePath: absoluteFilepath
          })
          .then(postcssResult => {
            if (postcssResult.stylelint.stylelintError && useCache) {
              debug(
                `${absoluteFilepath} contains linting errors and will not be cached.`
              );
              fileCache.removeEntry(absoluteFilepath);
            }

            // If we're fixing, save the file with changed code
            let fixFile = Promise.resolve();

            if (!postcssResult.stylelint.ignored && options.fix) {
              const fixedCss = postcssResult.root.toString(
                postcssResult.opts.syntax
              );

              if (postcssResult.root.source.input.css !== fixedCss) {
                fixFile = pify(writeFileAtomic)(absoluteFilepath, fixedCss);
              }
            }

            return fixFile.then(() =>
              stylelint._createStylelintResult(postcssResult, absoluteFilepath)
            );
          })
          .catch(error => {
            // On any error, we should not cache the lint result
            fileCache.removeEntry(absoluteFilepath);

            return handleError(stylelint, error);
          });
      });

      return Promise.all(getStylelintResults);
    })
    .then(stylelintResults => {
      if (useCache) {
        fileCache.reconcile();
      }

      return prepareReturnValue(stylelintResults);
    });

  function prepareReturnValue(
    stylelintResults /*: Array<stylelint$result>*/
  ) /*: stylelint$standaloneReturnValue*/ {
    const errored = stylelintResults.some(
      result => result.errored || result.parseErrors.length > 0
    );
    const returnValue /*: stylelint$standaloneReturnValue*/ = {
      errored,
      output: formatterFunction(stylelintResults),
      results: stylelintResults
    };

    if (reportNeedlessDisables) {
      returnValue.needlessDisables = needlessDisables(stylelintResults);
    }

    if (maxWarnings !== undefined) {
      const foundWarnings = stylelintResults.reduce((count, file) => {
        return count + file.warnings.length;
      }, 0);

      if (foundWarnings > maxWarnings) {
        returnValue.maxWarningsExceeded = { maxWarnings, foundWarnings };
      }
    }

    debug(`Linting complete in ${Date.now() - startTime}ms`);

    return returnValue;
  }
};

function handleError(
  stylelint /*: stylelint$internalApi */,
  error /*: Object */
) /*: Promise<stylelint$result> */ {
  if (error.name === "CssSyntaxError") {
    return createStylelintResult(stylelint, null, null, error);
  } else {
    throw error;
  }
}