/**
 * filemanager.js - file manager element for blessed
 * Copyright (c) 2013-2015, Christopher Jeffrey and contributors (MIT License).
 * https://github.com/chjj/blessed
 */

/**
 * Modules
 */

var path = require('path'),
  fs = require('fs');

var helpers = require('../helpers');

var Node = require('./node');
var List = require('./list');

/**
 * Interfaces
 */

interface FileManagerOptions {
  cwd?: string;
  label?: string;
  parseTags?: boolean;
  [key: string]: any;
}

interface FileItem {
  name: string;
  text: string;
  dir: boolean;
}

interface FileManagerLabel {
  setContent(content: string): void;
}

interface FileManagerScreen {
  focused: any;
  render(): void;
  saveFocus(): void;
  restoreFocus(): void;
}

interface FileManagerInterface extends List {
  type: string;
  cwd: string;
  file: string;
  value: string;
  _label: FileManagerLabel;
  screen: FileManagerScreen;
  options: FileManagerOptions;
  hidden: boolean;

  // Methods
  refresh(cwd?: string | Function, callback?: Function): any;
  pick(cwd?: string | Function, callback?: Function): void;
  reset(cwd?: string | Function, callback?: Function): void;
  emit(event: string, ...args: any[]): any;
  on(event: string, listener: Function): void;
  removeListener(event: string, listener: Function): void;
  setItems(items: string[]): void;
  select(index: number): void;
  hide(): void;
  show(): void;
  focus(): void;
}

/**
 * FileManager
 */

function FileManager(this: FileManagerInterface, options?: FileManagerOptions) {
  var self = this;

  if (!(this instanceof Node)) {
    return new FileManager(options);
  }

  options = options || {};
  options.parseTags = true;
  // options.label = ' {blue-fg}%path{/blue-fg} ';

  List.call(this, options);

  this.cwd = options.cwd || process.cwd();
  this.file = this.cwd;
  this.value = this.cwd;

  if (options.label && ~options.label.indexOf('%path')) {
    this._label.setContent(options.label.replace('%path', this.cwd));
  }

  this.on('select', function (item: any) {
    var value = item.content.replace(/\{[^{}]+\}/g, '').replace(/@$/, ''),
      file = path.resolve(self.cwd, value);

    return fs.stat(
      file,
      function (err: NodeJS.ErrnoException | null, stat?: fs.Stats) {
        if (err) {
          return self.emit('error', err, file);
        }
        self.file = file;
        self.value = file;
        if (stat.isDirectory()) {
          self.emit('cd', file, self.cwd);
          self.cwd = file;
          if (options.label && ~options.label.indexOf('%path')) {
            self._label.setContent(options.label.replace('%path', file));
          }
          self.refresh();
        } else {
          self.emit('file', file);
        }
      }
    );
  });
}

FileManager.prototype.__proto__ = List.prototype;

FileManager.prototype.type = 'file-manager';

FileManager.prototype.refresh = function (
  this: FileManagerInterface,
  cwd?: string | Function,
  callback?: Function
) {
  if (!callback) {
    callback = cwd;
    cwd = null;
  }

  var self = this;

  if (cwd) this.cwd = cwd;
  else cwd = this.cwd;

  return fs.readdir(
    cwd as string,
    function (err: NodeJS.ErrnoException | null, list?: string[]) {
      if (err && err.code === 'ENOENT') {
        self.cwd = cwd !== process.env.HOME ? process.env.HOME : '/';
        return self.refresh(callback);
      }

      if (err) {
        if (callback) return callback(err);
        return self.emit('error', err, cwd);
      }

      var dirs: FileItem[] = [],
        files: FileItem[] = [];

      list.unshift('..');

      list!.forEach(function (name: string) {
        var f = path.resolve(cwd as string, name),
          stat: fs.Stats | undefined;

        try {
          stat = fs.lstatSync(f);
        } catch (e) {}

        if ((stat && stat.isDirectory()) || name === '..') {
          dirs.push({
            name: name,
            text: '{light-blue-fg}' + name + '{/light-blue-fg}/',
            dir: true,
          });
        } else if (stat && stat.isSymbolicLink()) {
          files.push({
            name: name,
            text: '{light-cyan-fg}' + name + '{/light-cyan-fg}@',
            dir: false,
          });
        } else {
          files.push({
            name: name,
            text: name,
            dir: false,
          });
        }
      });

      dirs = helpers.asort(dirs);
      files = helpers.asort(files);

      list = dirs.concat(files).map(function (data: FileItem) {
        return data.text;
      });

      self.setItems(list);
      self.select(0);
      self.screen.render();

      self.emit('refresh');

      if (callback) callback();
    }
  );
};

FileManager.prototype.pick = function (
  this: FileManagerInterface,
  cwd?: string | Function,
  callback?: Function
) {
  if (!callback) {
    callback = cwd;
    cwd = null;
  }

  var self = this,
    focused = this.screen.focused === this,
    hidden = this.hidden,
    onfile,
    oncancel;

  function resume() {
    self.removeListener('file', onfile);
    self.removeListener('cancel', oncancel);
    if (hidden) {
      self.hide();
    }
    if (!focused) {
      self.screen.restoreFocus();
    }
    self.screen.render();
  }

  this.on(
    'file',
    (onfile = function (file: string) {
      resume();
      return callback(null, file);
    })
  );

  this.on(
    'cancel',
    (oncancel = function () {
      resume();
      return callback();
    })
  );

  this.refresh(cwd as string, function (err?: NodeJS.ErrnoException) {
    if (err) return callback(err);

    if (hidden) {
      self.show();
    }

    if (!focused) {
      self.screen.saveFocus();
      self.focus();
    }

    self.screen.render();
  });
};

FileManager.prototype.reset = function (
  this: FileManagerInterface,
  cwd?: string | Function,
  callback?: Function
) {
  if (!callback) {
    callback = cwd;
    cwd = null;
  }
  this.cwd = cwd || this.options.cwd;
  this.refresh(callback);
};

/**
 * Expose
 */

module.exports = FileManager;