/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package validate

import (
	"net/url"
	"regexp"
	"strings"
)

const (
	PATTERN_URI      string = `#%`
	PATTERN_URL             = "^(https|http):\\/\\/((?:(?:25[0-5]|2[0-4]\\d|((1\\d{2})|([1-9]?\\d)))\\.){3}(?:25[0-5]|2[0-4]\\d|((1\\d{2})|([1-9]?\\d)))):([0-9]+)$"
	PATTERN_HOSTNAME string = `^(([1-9]\d?|1\d\d|2[01]\d|22[0-3])(\.(1?\d{1,2}|2[0-4]\d|25[0-5])){2}(\.([0-9]\d?|1\d\d|2[0-4]\d|25[0-4])))(:(\d{1,5}))$`
)

var (
	rxURI      = regexp.MustCompile(PATTERN_URI)
	rxURL      = regexp.MustCompile(PATTERN_URL)
	rxHostName = regexp.MustCompile(PATTERN_HOSTNAME)
)

// IsURL check if the string is an URL.
func IsURL(str string) bool {
	if str == "" || len(str) >= 2083 || len(str) <= 3 || strings.HasPrefix(str, ".") {
		return false
	}
	u, err := url.Parse(str)
	if err != nil {
		return false
	}
	if strings.HasPrefix(u.Host, ".") {
		return false
	}
	if u.Host == "" && (u.Path != "" && !strings.Contains(u.Path, ".")) {
		return false
	}
	return rxHostName.MatchString(str)

}

func IsRequestURI(uri string) bool {
	if uri == "" || len(uri) >= 2048 || strings.HasPrefix(uri, ".") {
		return false
	}
	if strings.HasSuffix(uri, ";") || strings.HasSuffix(uri, "&") || strings.HasSuffix(uri, "?") || strings.HasSuffix(uri, "+") || strings.HasSuffix(uri, "@") || strings.Contains(uri, "//") {
		return false
	}
	return !rxURI.MatchString(uri)
}

//format : https://10.21.119.167:30100 or http://10.21.119.167:30100
func URLChecker(url string) bool {
	return rxURL.MatchString(url)
}