/**
   * @fileoverview Main CLI object.
   * @author Nicholas C. Zakas
   */
  
  "use strict";
  
  /*
   * The CLI object should *not* call process.exit() directly. It should only return
   * exit codes. This allows other programs to use the CLI object and still control
   * when the program exits.
   */
  
  //------------------------------------------------------------------------------
  // Requirements
  //------------------------------------------------------------------------------
  
  var fs = require("fs"),
      path = require("path"),
  
      debug = require("debug"),
  
      options = require("./options"),
      CLIEngine = require("./cli-engine"),
      mkdirp = require("mkdirp"),
      log = require("./logging");
  
  //------------------------------------------------------------------------------
  // Helpers
  //------------------------------------------------------------------------------
  
  debug = debug("eslint:cli");
  
  /**
   * Translates the CLI options into the options expected by the CLIEngine.
   * @param {Object} cliOptions The CLI options to translate.
   * @returns {CLIEngineOptions} The options object for the CLIEngine.
   * @private
   */
  function translateOptions(cliOptions) {
      return {
          envs: cliOptions.env,
          extensions: cliOptions.ext,
          rules: cliOptions.rule,
          plugins: cliOptions.plugin,
          globals: cliOptions.global,
          ignore: cliOptions.ignore,
          ignorePath: cliOptions.ignorePath,
          ignorePattern: cliOptions.ignorePattern,
          configFile: cliOptions.config,
          rulePaths: cliOptions.rulesdir,
          useEslintrc: cliOptions.eslintrc,
          parser: cliOptions.parser,
          cache: cliOptions.cache,
          cacheFile: cliOptions.cacheFile,
          cacheLocation: cliOptions.cacheLocation,
          fix: cliOptions.fix,
          allowInlineConfig: cliOptions.inlineConfig
      };
  }
  
  /**
   * Outputs the results of the linting.
   * @param {CLIEngine} engine The CLIEngine to use.
   * @param {LintResult[]} results The results to print.
   * @param {string} format The name of the formatter to use or the path to the formatter.
   * @param {string} outputFile The path for the output file.
   * @returns {boolean} True if the printing succeeds, false if not.
   * @private
   */
  function printResults(engine, results, format, outputFile) {
      var formatter,
          output,
          filePath;
  
      formatter = engine.getFormatter(format);
      if (!formatter) {
          log.error("Could not find formatter '%s'.", format);
          return false;
      }
  
      output = formatter(results);
  
      if (output) {
          if (outputFile) {
              filePath = path.resolve(process.cwd(), outputFile);
  
              if (fs.existsSync(filePath) && fs.statSync(filePath).isDirectory()) {
                  log.error("Cannot write to output file path, it is a directory: %s", outputFile);
                  return false;
              }
  
              try {
                  mkdirp.sync(path.dirname(filePath));
                  fs.writeFileSync(filePath, output);
              } catch (ex) {
                  log.error("There was a problem writing the output file:
  %s", ex);
                  return false;
              }
          } else {
              log.info(output);
          }
      }
  
      return true;
  
  }
  
  //------------------------------------------------------------------------------
  // Public Interface
  //------------------------------------------------------------------------------
  
  /**
   * Encapsulates all CLI behavior for eslint. Makes it easier to test as well as
   * for other Node.js programs to effectively run the CLI.
   */
  var cli = {
  
      /**
       * Executes the CLI based on an array of arguments that is passed in.
       * @param {string|Array|Object} args The arguments to process.
       * @param {string} [text] The text to lint (used for TTY).
       * @returns {int} The exit code for the operation.
       */
      execute: function(args, text) {
  
          var currentOptions,
              files,
              report,
              engine,
              tooManyWarnings;
  
          try {
              currentOptions = options.parse(args);
          } catch (error) {
              log.error(error.message);
              return 1;
          }
  
          files = currentOptions._;
  
          if (currentOptions.version) { // version from package.json
  
              log.info("v" + require("../package.json").version);
  
          } else if (currentOptions.help || (!files.length && !text)) {
  
              log.info(options.generateHelp());
  
          } else {
  
              debug("Running on " + (text ? "text" : "files"));
  
              // disable --fix for piped-in code until we know how to do it correctly
              if (text && currentOptions.fix) {
                  log.error("The --fix option is not available for piped-in code.");
                  return 1;
              }
  
              engine = new CLIEngine(translateOptions(currentOptions));
  
              report = text ? engine.executeOnText(text, currentOptions.stdinFilename) : engine.executeOnFiles(files);
              if (currentOptions.fix) {
                  debug("Fix mode enabled - applying fixes");
                  CLIEngine.outputFixes(report);
              }
  
              if (currentOptions.quiet) {
                  debug("Quiet mode enabled - filtering out warnings");
                  report.results = CLIEngine.getErrorResults(report.results);
              }
  
              if (printResults(engine, report.results, currentOptions.format, currentOptions.outputFile)) {
                  tooManyWarnings = currentOptions.maxWarnings >= 0 && report.warningCount > currentOptions.maxWarnings;
  
                  if (!report.errorCount && tooManyWarnings) {
                      log.error("ESLint found too many warnings (maximum: %s).", currentOptions.maxWarnings);
                  }
  
                  return (report.errorCount || tooManyWarnings) ? 1 : 0;
              } else {
                  return 1;
              }
  
          }
  
          return 0;
      }
  };
  
  module.exports = cli;