/*
 * !AntiShout.js
 * =============================================================================
 *
 * Dissalow to send text form written with CAPS LOCK on.
 * STOP SHOUT TO ME!!!
 *
 * @date: 04.2014
 * @author: Luke Samorodny
 * @contact: [email protected]
 * @licence: GPL v.3 or higher
 *
 * =============================================================================
 *
 * @usage:
 *
 * - Simple:
 * $(formSelector).antishout()
 *
 * - With options:
 *
 * var options = {
 *      // Messages
 *  capsLockOnAlert     : 'Your caps lock is on! Please disable it!',
 *      toMuchUpperCased    : 'Too much uppercased letters!',
 *
 *      // How much percent of uppercase can be in the string
 *      upperCaseRatio      : 30,
 *
 *      // Form elements listen
 *      listen              : {
 *                              textInput   : true,
 *                              textarea    : true
 *                            },
 *
 *      // Set minimum characters
 *      minChars            : {
 *                              textInput   : 6,
 *                              textarea    : 100
 *                            }
 * }
 *
 * $(formSelector).antishout(options)
 *
 */

;
(function (defaults, $, window, document, undefined) {

    'use strict';

    $.extend({

        pluginSetup: function (options) {
            return $.extend(defaults, options);
        }

    }).fn.extend({

            /**
             * Antishout public function
             * =====================================================================
             *
             * @usage: $(selector).antishout({property:'value'});
             */
            antishout: function (options) {

                options = $.extend({}, defaults, options);

                return $(this).each(function () {

                    /**
                     * Define some elements
                     * =============================================================
                     *
                     * @type array
                     */
                    var $$ = {
                        form: $(this),
                        alertBox: $(this).find('.message'),
                        keyCode: false,
                        shiftKey: false,
                        i: 0,
                        uCLetters: 0,
                        uCLettersRatio: 0,
                        lock: true
                    };

                    /**
                     * Check is caps lock on
                     * =============================================================
                     *
                     * @param {event} e
                     * @returns {Boolean|$$.shiftKey}
                     */
                    function capsLock(e) {
                        var s = String.fromCharCode(e.which);
                        if (s.toUpperCase() === s && s.toLowerCase() !== s && !e.shiftKey) {
                            return true;
                        } else {
                            return false;
                        }

                    };

                    /**
                     * Check is ratio UpperCase to LowerCase allowed
                     * =============================================================
                     *
                     * @param {string} string
                     * @returns {Boolean}
                     */
                    function checkUppercaseRatio(string) {
                        $$.uCLetters = string.replace(/[^A-Z]/g, "").length;
                        $$.uCLettersRatio = 100 * $$.uCLetters / $$.i;

                        return ($$.uCLettersRatio < options.upperCaseRatio) ? true : false;
                    };

                    /**
                     * Display message
                     * =============================================================
                     *
                     * @param {string} alert
                     */
                    function showAlert(alert) {
                        $$.alertBox.text(alert).show();
                    }

                    /**
                     * Hide message
                     * =============================================================
                     */
                    function clearAlert() {
                        $$.alertBox.text('').hide();
                    }

                    /**
                     * Unlock submit button
                     * =============================================================
                     */
                    function unlockSubmit() {
                        $$.form.find('[type="submit"]').removeAttr('disabled');
                    }

                    /**
                     * Lock submit button back
                     * =============================================================
                     */
                    function lockSubmit() {
                        $$.form.find('[type="submit"]').attr('disabled', 'disabled');
                    }

                    /**
                     * Start listen text input
                     * =============================================================
                     */

                    function listen(element, minChars) {

                        $$.form.find(element).each(function () {
                            var $this = $(this);

                            $this.on('keypress', function (e) {
                                if (capsLock(e)) {
                                    showAlert(options.capsLockOnAlert);
                                    $$.lock = true;
                                } else {
                                    clearAlert();
                                    $$.lock = false;
                                }
                            });

                            $this.on('keyup', function () {
                                $$.i = $this.val().length;

                                if ($$.i >= minChars) {
                                    if (!checkUppercaseRatio($this.val())) {
                                        showAlert(options.toMuchUpperCased);
                                        $$.lock = true;
                                    } else {
                                        clearAlert();
                                        $$.lock = false;
                                    }

                                    if (!$$.lock) {
                                        unlockSubmit();
                                    } else {
                                        lockSubmit();
                                    }
                                }
                            });
                        });
                    }

                    if (options.listen.textInput) {
                        listen('input[type="text"]', options.minChars.textInput);
                    }

                    if (options.listen.textarea) {
                        listen('textarea', options.minChars.textarea);
                    }


                });
            }
        });
})({

    // Messages
    capsLockOnAlert: 'Your caps lock is on! Please disable it!',
    toMuchUpperCased: 'Too much uppercased letters!',

    // How much percent of uppercase can be in the string
    upperCaseRatio: 30,

    // Form elements listen
    listen: {
        textInput: true,
        textarea: true
    },

    // Set minimum characters
    minChars: {
        textInput: 6,
        textarea: 100
    }


}, jQuery, window, document);