/*!
 * OS.js - JavaScript Cloud/Web Desktop Platform
 *
 * Copyright (c) 2011-2016, Anders Evenrud <andersevenrud@gmail.com>
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * 1. Redistributions of source code must retain the above copyright notice, this
 *    list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright notice,
 *    this list of conditions and the following disclaimer in the documentation
 *    and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 'AS IS' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 * @author  Anders Evenrud <andersevenrud@gmail.com>
 * @licence Simplified BSD License
 */
(function(Application, Window, Utils, API, VFS, GUI) {
  /*eslint eqeqeq: "off"*/
  'use strict';

  var ops = {
    dec      : '.',
    perc     : '%',
    minus    : '-',
    plus     : '+',
    multiply : '*',
    divide   : '/'
  };

  var keys = {
    107: 'plus',
    109: 'minus',
    106: 'multiply',
    111: 'divide',
    110: 'dec',
    188: 'dec',
    13: 'equal',
    47: 'divide',
    46: 'CE',
    45: 'minus',
    44: 'dec',
    43: 'plus',
    42: 'multiply',
    27: 'CE',
    8: 'nbs'
  };

  var labels = {
    'CE' : 'CE',  'AC'  : 'AC', 'perc' : '%',  'plus'     : '+',
    '7'  : '7',   '8'   : '8',  '9'    : '9',  'minus'    : '-',
    '4'  : '4',   '5'   : '5',  '6'    : '6',  'multiply' : 'x',
    '1'  : '1',   '2'   : '2',  '3'    : '3',  'divide'   : '÷',
    '0'  : '0',   'swap': '±',  'dec'  : ',',  'equal'    : '='
  };

  var buttons = [
    ['CE', 'AC',   'perc', 'plus'],
    ['7',  '8',    '9',    'minus'],
    ['4',  '5',    '6',    'multiply'],
    ['1',  '2',    '3',    'divide'],
    ['0',  'dec',  'equal']
  ];

  /////////////////////////////////////////////////////////////////////////////
  // WINDOWS
  /////////////////////////////////////////////////////////////////////////////

  function ApplicationCalculatorWindow(app, metadata, scheme) {
    Window.apply(this, ['ApplicationCalculatorWindow', {
      icon: metadata.icon,
      title: metadata.name,
      allow_resize: false,
      allow_maximize: false,
      width: 220,
      height: 340
    }, app, scheme]);

    this.total = 0;
    this.entries = [];
    this.temp = '';
  }

  ApplicationCalculatorWindow.prototype = Object.create(Window.prototype);
  ApplicationCalculatorWindow.constructor = Window.prototype;

  ApplicationCalculatorWindow.prototype.init = function(wm, app, scheme) {
    var root = Window.prototype.init.apply(this, arguments);
    var self = this;

    // Load and gel.set up scheme (GUI) here
    scheme.render(this, 'CalculatorWindow', root);

    this._scheme.find(this, 'Output').on('keypress', function(ev) {
      ev.stopPropagation();
      ev.preventDefault();

      var keyCode = ev.which || ev.keyCode;
      if ( (keyCode > 95) && (keyCode < 106) ) {
        self.operation(keyCode - 96);
      } else if ( (keyCode > 47) && (keyCode < 58) ) {
        self.operation(keyCode - 48);
      } else {
        if ( typeof keys[keyCode] !== 'undefined' ) {
          self.operation(keys[keyCode]);
        }
      }
    }).set('readonly', true).focus();

    root.querySelectorAll('gui-button').forEach(function(el, idx) {
      var r = parseInt(idx / 4, 10);
      var c = idx % 4;
      var op = buttons[r][c];

      el = scheme.get(el);
      el.set('value', labels[op] || '');
      if ( op === null ) {
        Utils.$addClass(el.$element, 'noop');
        el.set('disabled', true);
      } else {
        el.on('click', function() {
          self.operation(op);
        });
      }
    });

    return root;
  };

  ApplicationCalculatorWindow.prototype.operation = function(val) {
    var self = this;

    if (this.temp == '' && ['plus', 'minus', 'multiply', 'divide'].indexOf(val) !== -1) {
      this.temp = this._scheme.find(this, 'Output').get('value');
    }

    function getAnswer() {
      var nt = Number(self.entries[0]);

      for ( var i = 1; i < self.entries.length; i++ ) {
        var nextNum = Number(self.entries[i + 1]);
        var symbol = self.entries[i];
        if (symbol === '+') {
          nt += nextNum;
        } else if ( symbol === '-' ) {
          nt -= nextNum;
        } else if ( symbol === '*' ) {
          nt *= nextNum;
        } else if ( symbol === '/' ) {
          nt /= nextNum;
        }
        i++;
      }

      if ( nt < 0 ) {
        nt = '-' + Math.abs(nt);
      }

      return nt;
    }

    var output = (function() {
      // Kudos http://codepen.io/GeoffStorbeck/pen/zxgaqw

      if ( !isNaN(val) || val === 'dec' ) { // Number
        self.temp += val === 'dec' ? ops[val] : val;

        return self.temp.substring(0,10);
      } else if ( val === 'AC' ) { // Clear
        self.entries = [];
        self.temp = '';
        self.total = 0;

        return '';
      } else if ( val === 'CE' ) { // Clear Last Entry
        self.temp = '';

        return '';
      } else if ( val === 'equal' ) { // Equal
        self.entries.push(self.temp);

        var nt = getAnswer();
        self.entries = [];
        self.temp = '';

        return nt;
      } else {
        if ( typeof ops[val] !== 'undefined' ) {
          val = ops[val];
        }

        self.entries.push(self.temp);
        self.entries.push(val);
        self.temp = '';
      }

      return null;
    })();

    if ( output !== null ) {
      if ( !String(output).length ) {
        output = String(0);
      }

      if ( output === 'NaN' || output === 'Infinity' || isNaN(output) || !isFinite(output) ) {
        Utils.$addClass(this._$element, 'NaN');

        setTimeout(function() {
          Utils.$removeClass(self._$element, 'NaN');
        }, 3000);
      }

      this._scheme.find(this, 'Output').set('value', String(output));
    }

    this._scheme.find(this, 'Output').focus();
  };

  /////////////////////////////////////////////////////////////////////////////
  // APPLICATION
  /////////////////////////////////////////////////////////////////////////////

  var ApplicationCalculator = function(args, metadata) {
    Application.apply(this, ['ApplicationCalculator', args, metadata]);
  };

  ApplicationCalculator.prototype = Object.create(Application.prototype);
  ApplicationCalculator.constructor = Application;

  ApplicationCalculator.prototype.init = function(settings, metadata, scheme) {
    Application.prototype.init.apply(this, arguments);

    this._addWindow(new ApplicationCalculatorWindow(this, metadata, scheme));
  };

  /////////////////////////////////////////////////////////////////////////////
  // EXPORTS
  /////////////////////////////////////////////////////////////////////////////

  OSjs.Applications = OSjs.Applications || {};
  OSjs.Applications.ApplicationCalculator = OSjs.Applications.ApplicationCalculator || {};
  OSjs.Applications.ApplicationCalculator.Class = Object.seal(ApplicationCalculator);

})(OSjs.Core.Application, OSjs.Core.Window, OSjs.Utils, OSjs.API, OSjs.VFS, OSjs.GUI);