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package g0401_0500.s0468_validate_ip_address;

// #Medium #String #2022_07_19_Time_2_ms_(73.87%)_Space_42.4_MB_(42.34%)

/**
 * 468 - Validate IP Address\.
 *
 * Medium
 *
 * Given a string `queryIP`, return `"IPv4"` if IP is a valid IPv4 address, `"IPv6"` if IP is a valid IPv6 address or `"Neither"` if IP is not a correct IP of any type.
 *
 * **A valid IPv4** address is an IP in the form "x1.x2.x3.x4" where 0 <= xi <= 255 and xi **cannot contain** leading zeros. For example, `"192.168.1.1"` and `"192.168.1.0"` are valid IPv4 addresses but `"192.168.01.1"`, while `"192.168.1.00"` and `"192.168@1.1"` are invalid IPv4 addresses.
 *
 * **A valid IPv6** address is an IP in the form "x1:x2:x3:x4:x5:x6:x7:x8" where:
 *
 * *   1 <= xi.length <= 4
 * *   xi is a **hexadecimal string** which may contain digits, lower-case English letter (`'a'` to `'f'`) and upper-case English letters (`'A'` to `'F'`).
 * *   Leading zeros are allowed in xi.
 *
 * For example, "`2001:0db8:85a3:0000:0000:8a2e:0370:7334"` and "`2001:db8:85a3:0:0:8A2E:0370:7334"` are valid IPv6 addresses, while "`2001:0db8:85a3::8A2E:037j:7334"` and "`02001:0db8:85a3:0000:0000:8a2e:0370:7334"` are invalid IPv6 addresses.
 *
 * **Example 1:**
 *
 * **Input:** queryIP = "172.16.254.1"
 *
 * **Output:** "IPv4"
 *
 * **Explanation:** This is a valid IPv4 address, return "IPv4".
 *
 * **Example 2:**
 *
 * **Input:** queryIP = "2001:0db8:85a3:0:0:8A2E:0370:7334"
 *
 * **Output:** "IPv6"
 *
 * **Explanation:** This is a valid IPv6 address, return "IPv6".
 *
 * **Example 3:**
 *
 * **Input:** queryIP = "256.256.256.256"
 *
 * **Output:** "Neither"
 *
 * **Explanation:** This is neither a IPv4 address nor a IPv6 address.
 *
 * **Constraints:**
 *
 * *   `queryIP` consists only of English letters, digits and the characters `'.'` and `':'`.
**/
public class Solution {
    private static final String NEITHER = "Neither";

    public String validIPAddress(String ip) {
        if (ip.length() == 0) {
            return NEITHER;
        }
        String[] arr = ip.split("\\.", -1);
        String[] arr1 = ip.split(":", -1);
        if (arr.length == 4) {
            for (String num : arr) {
                try {
                    if ((num.length() > 1 && num.startsWith("0")) || Integer.parseInt(num) > 255) {
                        return NEITHER;
                    }
                } catch (Exception e) {
                    return NEITHER;
                }
            }
            return "IPv4";
        } else if (arr1.length == 8) {
            for (String num : arr1) {
                if (num.length() < 1 || num.length() > 4) {
                    return NEITHER;
                }
                for (int j = 0; j < num.length(); j++) {
                    char ch = num.charAt(j);
                    if (ch > 9
                            && (Character.isLowerCase(ch) && ch > 'f'
                                    || Character.isUpperCase(ch) && ch > 'F')) {
                        return NEITHER;
                    }
                }
            }
            return "IPv6";
        }
        return NEITHER;
    }
}




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