package request

import (
	"fmt"
	"net/url"
)

func UrlValues() {
	val := url.Values{}
	val.Set("name", "Tom")
	val.Set("age", "18")
	fmt.Println(val.Encode()) // age=18&name=Tom (自动按key升序)
	val.Add("color", "red")
	val.Add("color", "green")
	fmt.Println(val)              //map[age:[18] color:[red green] name:[Tom]]
	fmt.Println(val.Get("color")) //red (Get方法取到第一个)
	val.Del("age")
	fmt.Println(val.Encode()) //color=red&color=green&name=Tom (color后者会覆盖前者)
}

func Parse() {
	u, err := url.Parse("http://example.com:8008/home?lang=go&env=browser#top")
	if err != nil {
		fmt.Fatal(err)
	}
	fmt.Println(u.Scheme, u.Host)       // http example.com:8008
	fmt.Println(u.Hostname(), u.Port()) // example.com 8008
	fmt.Println(u.Path)                 // /home
	fmt.Println(u.Fragment)             // top
	fmt.Println(u.RequestURI())         // /home?lang=go&env=browser
	fmt.Println(u.RawQuery)             // lang=go&env=browser
	fmt.Println(u.Query())              // map[env:[browser] lang:[go]] 返回url.ParseQuery(u.RawQuery)的值忽略error
	fmt.Println(u.String())             // http://example.com:8008/home?lang=go&env=browser#top
}

func Escape() {
	//escapes the string so it can be safely placed inside a URL query.
	encode := url.QueryEscape("/<a>{ }")
	fmt.Println(encode) //%2F%3Ca%3E%7B+%7D
	decode, err := url.QueryUnescape(encode)
	fmt.Println(decode, err)

	//escapes the string so it can be safely placed inside a URL path segment.
	e := url.PathEscape("/a/b")
	fmt.Println(e) //%2Fa%2Fb
	d, err := url.PathUnescape(e)
	fmt.Println(d, err)
}