class PasswordSecurity {
    numbers = "0123456789";
    lowercaseLetters = "abcdefghijklmnopqrstuvwxyz";
    uppercaseLetters = "ABDEFGHIJKLMNOPQRSTUVWXYZ";
    lowercaseUmlauts = "äöüß";
    uppercaseUmlauts = "ÄÖÜ";
    specialChars1 = "\\\"\'µ@€!";
    specialChars2 = "&/()=?+*";
    specialChars3 = ",.-;:_><|";
    specialChars4 = "§$%'{[]}´";
    specialChars5 = "`^°~²³";

    isPartial = false;
    partialPassword = "";
    passwordLengthDifference = 0;
    score = 0;
    previousValue = 0;
    schalter = false;
    previousValues = [];

    passwordLabelId = "";

    constructor(pwLabelId) {
        this.passwordLabelId = pwLabelId;
    }

    validatePassword(password) {
        if (false === isUndefinedOrNull(password) && password.length > 0) {
            var sx = "";
            var passwordStrength = -1;

            for (var i = 0; i < password.length; i++) {
                sx += password[i];

                if (sx.length < this.partialPassword.length) {
                    this.isPartial = true;
                    this.passwordLengthDifference = this.partialPassword.length - sx.length;
                }

                if (this.partialPassword !== sx) {
                    this.partialPassword = sx;
                }

                passwordStrength = this.calculatePasswordStrength(sx);
            }

            this.displayPasswordStrength(passwordStrength);
            return;
        }

        this.score = 0;
        this.previousValue = 0;

        this.displayPasswordStrength(-1);
    }

    getIntegerFromArray(arr, index) {
        if (arr === undefined || arr === null || arr.length < index) {
            return 0;
        }

        var intValue = $.parseInt(arr[index], 10);

        return $.isNumeric(intValue) ? intValue : 0;
    }

    getLastValue() {
        if (this.previousValues === undefined || this.previousValues === null || this.previousValues.length === 0) {
            return 0;
        }

        return this.previousValues[this.previousValues.length - 1];
    }

    calculatePasswordStrength(passwordToValidate) {
        var passwordStrength = 0;
        this.previousValue = 0;

        if (this.isPartial === true) {
            if (this.passwordLengthDifference === 1) {
                this.score -= this.getLastValue();
                this.previousValues.pop();
            } else {
                for (var i = 0; i < this.passwordLengthDifference; i++) {
                    this.score -= this.getLastValue();
                    this.previousValues.pop();
                }
            }

            this.isPartial = false;
        } else {
            var passwordLength = passwordToValidate.length;

            if (passwordLength >= 6 && passwordLength < 9) {
                this.score += 1;
                this.previousValue = 1;
                this.schalter = true;
            }

            if (passwordLength >= 9 && passwordLength < 12) {
                this.score += 2;
                this.previousValue = 2;
                this.schalter = true;
            }

            if (passwordLength >= 12 && passwordLength < 18) {
                this.score += 3;
                this.previousValue = 3;
                this.schalter = true;
            }

            if (passwordLength >= 18) {
                this.score += 4;
                this.previousValue = 4;
                this.schalter = true;
            }

            var passwordAsArray = Array.from(passwordToValidate);

            // Zahlen
            var containsNumbers = false;
            for (var i = 0; i < passwordAsArray.length; i++) {
                if (this.numbers.includes(passwordAsArray[i])) {
                    containsNumbers = true;
                    break;
                }
            }

            // Kleinbuchstaben
            var containsLowercaseLetters = false;
            for (var i = 0; i < passwordAsArray.length; i++) {
                if (this.lowercaseLetters.includes(passwordAsArray[i])) {
                    containsLowercaseLetters = true;
                    break;
                }
            }

            // Großbuchstaben
            var containsUppercaseLetters = false;
            for (var i = 0; i < passwordAsArray.length; i++) {
                if (this.uppercaseLetters.includes(passwordAsArray[i])) {
                    containsUppercaseLetters = true;
                    break;
                }
            }

            // Kleinumlaute
            var containsLowercaseUmlauts = false;
            for (var i = 0; i < passwordAsArray.length; i++) {
                if (this.lowercaseUmlauts.includes(passwordAsArray[i])) {
                    containsLowercaseUmlauts = true;
                    break;
                }
            }

            // Großumlaute
            var containsUppercaseUmlauts = false;
            for (var i = 0; i < passwordAsArray.length; i++) {
                if (this.uppercaseUmlauts.includes(passwordAsArray[i])) {
                    containsUppercaseUmlauts = true;
                    break;
                }
            }

            // Sonderzeichen 1
            var containsSpecialCharacters1 = false;
            for (var i = 0; i < passwordAsArray.length; i++) {
                if (this.specialChars1.includes(passwordAsArray[i])) {
                    containsSpecialCharacters1 = true;
                    break;
                }
            }

            var containsSpecialCharacters2 = false;
            for (var i = 0; i < passwordAsArray.length; i++) {
                if (this.specialChars2.includes(passwordAsArray[i])) {
                    containsSpecialCharacters2 = true;
                    break;
                }
            }

            var containsSpecialCharacters3 = false;
            for (var i = 0; i < passwordAsArray.length; i++) {
                if (this.specialChars3.includes(passwordAsArray[i])) {
                    containsSpecialCharacters3 = true;
                    break;
                }
            }

            var containsSpecialCharacters4 = false;
            for (var i = 0; i < passwordAsArray.length; i++) {
                if (this.specialChars4.includes(passwordAsArray[i])) {
                    containsSpecialCharacters4 = true;
                    break;
                }
            }

            var containsSpecialCharacters5 = false;
            for (var i = 0; i < passwordAsArray.length; i++) {
                if (this.specialChars5.includes(passwordAsArray[i])) {
                    containsSpecialCharacters5 = true;
                    break;
                }
            }

            if (containsNumbers === true) {
                this.addScoreValue(3);
            }

            if (containsLowercaseLetters === true) {
                this.addScoreValue(2);
            }

            if (containsUppercaseLetters === true) {
                this.addScoreValue(3);
            }

            if (containsLowercaseUmlauts === true) {
                this.addScoreValue(2);
            }

            if (containsUppercaseUmlauts === true) {
                this.addScoreValue(2);
            }

            if (containsSpecialCharacters1 === true) {
                this.addScoreValue(4);
            }

            if (containsSpecialCharacters2 === true) {
                this.addScoreValue(4);
            }

            if (containsSpecialCharacters3 === true) {
                this.addScoreValue(4);
            }

            if (containsSpecialCharacters4 === true) {
                this.addScoreValue(4);
            }

            if (containsSpecialCharacters5 === true) {
                this.addScoreValue(4);
            }

            this.previousValues.push(this.previousValue);
        }

        if (this.score <= 15) {
            passwordStrength = 0;
        }

        if (this.score > 15 && this.score <= 55) {
            passwordStrength = 1;
        }

        if (this.score > 55 && this.score <= 115) {
            passwordStrength = 2;
        }

        if (this.score > 115 && this.score <= 155) {
            passwordStrength = 3;
        }

        if (this.score > 155) {
            passwordStrength = 4;
        }

        return passwordStrength;
    }

    addScoreValue(defaultValue) {
        if (defaultValue === undefined || defaultValue === null || false === $.isNumeric(defaultValue)) {
            return;
        }

        this.score += defaultValue;

        if (this.schalter === true) {
            this.previousValue += defaultValue;
        } else {
            this.previousValue = defaultValue;
        }
    }

    displayPasswordStrength(passwordStrength) {
        var passwordLabel = $("#" + this.passwordLabelId);

        if (passwordStrength === undefined || !$.isNumeric(passwordStrength) || !passwordLabel.length) {
            return;
        }

        passwordLabel.removeClass("text-success text-danger text-warning");

        switch (passwordStrength) {
            case -1:
                passwordLabel.addClass("d-none");
                passwordLabel.html("");
                break;
            case 0:
                passwordLabel.removeClass("d-none");
                passwordLabel.html("Passwortstärke: Sehr schwach");
                passwordLabel.addClass("text-danger");
                break;
            case 1:
                passwordLabel.removeClass("d-none");
                passwordLabel.html("Passwortstärke: Schwach");
                passwordLabel.addClass("text-danger");
                break;
            case 2:
                passwordLabel.removeClass("d-none");
                passwordLabel.html("Passwortstärke: Mittel");
                passwordLabel.addClass("text-warning");
                break;
            case 3:
                passwordLabel.removeClass("d-none");
                passwordLabel.html("Passwortstärke: Stark");
                passwordLabel.addClass("text-success");
                break;
            case 4:
                passwordLabel.removeClass("d-none");
                passwordLabel.html("Passwortstärke: Sehr stark");
                passwordLabel.addClass("text-success");
                break;
        }
    }
}