// CodeMirror, copyright (c) by Marijn Haverbeke and others
// Distributed under an MIT license: https://codemirror.net/LICENSE

(function(mod) {
  if (typeof exports == "object" && typeof module == "object") // CommonJS
    mod(require("codemirror/lib/codemirror"));
  else if (typeof define == "function" && define.amd) // AMD
    define(["codemirror/lib/codemirror"], mod);
  else // Plain browser env
    mod(CodeMirror);
})(function(CodeMirror) {
  "use strict";
  // declare global: JSHINT

  function validator(text, options) {
    if (!window.JSHINT) {
      if (window.console) {
        window.console.error("Error: window.JSHINT not defined, CodeMirror JavaScript linting cannot run.");
      }
      return [];
    }

    // To ignore the 'async/await' errors, we'll manually edit the code ('text')
    // that gets processed by JSHINT to include the ignore directory
    const splitText = text.split("\n");
    const ignoreDirective = " // jshint ignore:line";
    for (let i = 0; i < splitText.length; ++i) {
        if (splitText[i].match(/.*async function.+{/g)) {
            splitText[i] += ignoreDirective;
        } else if (splitText[i].match(/.*await.+;/g)) {
            splitText[i] += ignoreDirective;
        }
    }
    const sanitizedText = splitText.join("\n");

    // Configure JSHINT options
    if (!options.indent) // JSHint error.character actually is a column index, this fixes underlining on lines using tabs for indentation
      options.indent = 1; // JSHint default value is 4

    options.esversion = 6;

    JSHINT(sanitizedText, options, options.globals);
    var errors = JSHINT.data().errors, result = [];
    if (errors) parseErrors(errors, result);
    return result;
  }

  CodeMirror.registerHelper("lint", "netscript", validator);

  function parseErrors(errors, output) {
    for ( var i = 0; i < errors.length; i++) {
      var error = errors[i];
      if (error) {
        if (error.line == 0) { continue; }
        if (error.line < 0) {
          if (window.console) {
            window.console.warn("Cannot display JSHint error (invalid line " + error.line + ")", error);
          }
          continue;
        }

        var start = error.character - 1, end = start + 1;
        if (error.evidence) {
          var index = error.evidence.substring(start).search(/.\b/);
          if (index > -1) {
            end += index;
          }
        }

        // Convert to format expected by validation service
        var hint = {
          message: error.reason,
          severity: error.code ? (error.code.startsWith('W') ? "warning" : "error") : "error",
          from: CodeMirror.Pos(error.line - 1, start),
          to: CodeMirror.Pos(error.line - 1, end)
        };

        output.push(hint);
      }
    }
  }
});