/* eslint-disable no-console */
'use strict';

function _inheritsLoose(subClass, superClass) { subClass.prototype = Object.create(superClass.prototype); subClass.prototype.constructor = subClass; subClass.__proto__ = superClass; }

var fs = require('fs');

var path = require('path');

var Loader = require('./loader');

var _require = require('./precompiled-loader.js'),
    PrecompiledLoader = _require.PrecompiledLoader;

var chokidar;

try {
  chokidar = require('chokidar'); // eslint-disable-line global-require
} catch (e) {} // eslint-disable-line no-empty


var FileSystemLoader =
/*#__PURE__*/
function (_Loader) {
  _inheritsLoose(FileSystemLoader, _Loader);

  function FileSystemLoader(searchPaths, opts) {
    var _this;

    _this = _Loader.call(this) || this;

    if (typeof opts === 'boolean') {
      console.log('[nunjucks] Warning: you passed a boolean as the second ' + 'argument to FileSystemLoader, but it now takes an options ' + 'object. See http://mozilla.github.io/nunjucks/api.html#filesystemloader');
    }

    opts = opts || {};
    _this.pathsToNames = {};
    _this.noCache = !!opts.noCache;

    if (searchPaths) {
      searchPaths = Array.isArray(searchPaths) ? searchPaths : [searchPaths]; // For windows, convert to forward slashes

      _this.searchPaths = searchPaths.map(path.normalize);
    } else {
      _this.searchPaths = ['.'];
    }

    if (opts.watch) {
      // Watch all the templates in the paths and fire an event when
      // they change
      if (!chokidar) {
        throw new Error('watch requires chokidar to be installed');
      }

      var paths = _this.searchPaths.filter(fs.existsSync);

      var watcher = chokidar.watch(paths);
      watcher.on('all', function (event, fullname) {
        fullname = path.resolve(fullname);

        if (event === 'change' && fullname in _this.pathsToNames) {
          _this.emit('update', _this.pathsToNames[fullname], fullname);
        }
      });
      watcher.on('error', function (error) {
        console.log('Watcher error: ' + error);
      });
    }

    return _this;
  }

  var _proto = FileSystemLoader.prototype;

  _proto.getSource = function getSource(name) {
    var fullpath = null;
    var paths = this.searchPaths;

    for (var i = 0; i < paths.length; i++) {
      var basePath = path.resolve(paths[i]);
      var p = path.resolve(paths[i], name); // Only allow the current directory and anything
      // underneath it to be searched

      if (p.indexOf(basePath) === 0 && fs.existsSync(p)) {
        fullpath = p;
        break;
      }
    }

    if (!fullpath) {
      return null;
    }

    this.pathsToNames[fullpath] = name;
    var source = {
      src: fs.readFileSync(fullpath, 'utf-8'),
      path: fullpath,
      noCache: this.noCache
    };
    this.emit('load', name, source);
    return source;
  };

  return FileSystemLoader;
}(Loader);

var NodeResolveLoader =
/*#__PURE__*/
function (_Loader2) {
  _inheritsLoose(NodeResolveLoader, _Loader2);

  function NodeResolveLoader(opts) {
    var _this2;

    _this2 = _Loader2.call(this) || this;
    opts = opts || {};
    _this2.pathsToNames = {};
    _this2.noCache = !!opts.noCache;

    if (opts.watch) {
      if (!chokidar) {
        throw new Error('watch requires chokidar to be installed');
      }

      _this2.watcher = chokidar.watch();

      _this2.watcher.on('change', function (fullname) {
        _this2.emit('update', _this2.pathsToNames[fullname], fullname);
      });

      _this2.watcher.on('error', function (error) {
        console.log('Watcher error: ' + error);
      });

      _this2.on('load', function (name, source) {
        _this2.watcher.add(source.path);
      });
    }

    return _this2;
  }

  var _proto2 = NodeResolveLoader.prototype;

  _proto2.getSource = function getSource(name) {
    // Don't allow file-system traversal
    if (/^\.?\.?(\/|\\)/.test(name)) {
      return null;
    }

    if (/^[A-Z]:/.test(name)) {
      return null;
    }

    var fullpath;

    try {
      fullpath = require.resolve(name);
    } catch (e) {
      return null;
    }

    this.pathsToNames[fullpath] = name;
    var source = {
      src: fs.readFileSync(fullpath, 'utf-8'),
      path: fullpath,
      noCache: this.noCache
    };
    this.emit('load', name, source);
    return source;
  };

  return NodeResolveLoader;
}(Loader);

module.exports = {
  FileSystemLoader: FileSystemLoader,
  PrecompiledLoader: PrecompiledLoader,
  NodeResolveLoader: NodeResolveLoader
};