package curl2info

import (
	"io/ioutil"
	"log"
	"os"
	"regexp"
	"strconv"
	"strings"

	"474420502.top/eson/requests"
)

func init() {
	optionTrie = newTrie()
	oelist := []*optionExecute{
		{"-H", 10, parseHeader, nil},
		{"-X", 10, parseOptX, nil},
		{"-A", 15, parseUserAgent, &extract{re: "^-A +(.+)", execute: extractData}},
		{"-I", 15, parseOptI, nil},
		{"-d", 10, parseBodyASCII, &extract{re: "^-d +(.+)", execute: extractData}},
		{"-u", 15, parseUser, &extract{re: "^-u +(.+)", execute: extractData}},
		{"-k", 15, parseInsecure, nil},
		// Body
		{"--data", 10, parseBodyASCII, &extract{re: "--data +(.+)", execute: extractData}},
		{"--data-urlencode", 10, parseBodyURLEncode, &extract{re: "--data-urlencode +(.+)", execute: extractData}},
		{"--data-binary", 10, parseBodyBinary, &extract{re: "--data-binary +(.+)", execute: extractData}},
		{"--data-ascii", 10, parseBodyASCII, &extract{re: "--data-ascii +(.+)", execute: extractData}},
		{"--data-raw", 10, parseBodyRaw, &extract{re: "--data-raw +(.+)", execute: extractData}},
		//"--"
		{"--header", 10, parseHeader, nil},
		{"--insecure", 15, parseInsecure, nil},
		{"--task", 10, parseITask, &extract{re: "--task +(.+)", execute: extractData}},
		{"--user-agent", 15, parseUserAgent, &extract{re: "--user-agent +(.+)", execute: extractData}},
		{"--user", 15, parseUser, &extract{re: "--user +(.+)", execute: extractData}},
		{"--connect-timeout", 15, parseTimeout, &extract{re: "--connect-timeout +(.+)", execute: extractData}},
	}

	for _, oe := range oelist {
		optionTrie.Insert(oe)
	}

	// log.Println("support options:", optionTrie.AllWords())
}

// extract 用于提取设置的数据
type extract struct {
	re      string
	execute func(re, soption string) string
}

func (et *extract) Execute(soption string) string {
	return et.execute(et.re, soption)
}

// OptionTrie 设置的前缀树
var optionTrie *hTrie

type optionExecute struct {
	Prefix string

	Priority int

	Execute func(*CURL, string) // 执行函数
	Extract *extract            // 提取的方法结构与参数
}

func (oe *optionExecute) GetWord() string {
	return oe.Prefix + " "
}

func (oe *optionExecute) BuildFunction(curl *CURL, soption string) *parseFunction {
	data := soption
	if oe.Extract != nil {
		data = oe.Extract.Execute(data)
	}
	return &parseFunction{ParamCURL: curl, ParamData: data, ExecuteFunction: oe.Execute, Priority: oe.Priority}
}

func judgeOptions(u *CURL, soption string) *parseFunction {
	word := trieStrWord(soption)
	if ioe := optionTrie.SearchMostPrefix(&word); ioe != nil {
		oe := ioe.(*optionExecute)
		return oe.BuildFunction(u, soption)
	}

	log.Println(soption, " no haved this option")
	return nil
}

func extractData(re, soption string) string {
	datas := regexp.MustCompile(re).FindStringSubmatch(soption)
	return strings.Trim(datas[1], "'")
}

func parseITask(u *CURL, value string) {
	u.ITask = value
}

func parseTimeout(u *CURL, value string) {
	timeout, err := strconv.Atoi(value)
	if err != nil {
		panic(err)
	}
	u.Timeout = timeout
}

func parseInsecure(u *CURL, soption string) {
	u.Insecure = true
}

func parseUser(u *CURL, soption string) {
	auth := strings.Split(soption, ":")
	u.Auth = &requests.BasicAuth{User: auth[0], Password: auth[1]}
}

func parseUserAgent(u *CURL, value string) {
	u.Header.Add("User-Agent", value)
}

func parseOptI(u *CURL, soption string) {
	u.Method = "HEAD"
}

func parseOptX(u *CURL, soption string) {
	matches := regexp.MustCompile("-X +(.+)").FindStringSubmatch(soption)
	method := strings.Trim(matches[1], "'")
	u.Method = method
}

func parseBodyURLEncode(u *CURL, data string) {
	if u.Method != "" {
		u.Method = "POST"
	}

	u.Body.SetPrefix(requests.TypeURLENCODED)
	u.Body.SetIOBody(data)
}

func parseBodyRaw(u *CURL, data string) {
	if u.Method != "" {
		u.Method = "POST"
	}

	u.Body.SetPrefix(requests.TypeURLENCODED)
	u.Body.SetIOBody(data)
}

func parseBodyASCII(u *CURL, data string) {
	if u.Method != "" {
		u.Method = "POST"
	}

	u.Body.SetPrefix(requests.TypeURLENCODED)

	if data[0] != '@' {
		u.Body.SetIOBody(data)
	} else {
		f, err := os.Open(data[1:])
		if err != nil {
			panic(err)
		}
		defer f.Close()

		bdata, err := ioutil.ReadAll(f)
		if err != nil {
			panic(err)
		}
		u.Body.SetIOBody(bdata)
	}
}

// 处理@ 并且替/r/n符号
func parseBodyBinary(u *CURL, data string) {
	if u.Method != "" {
		u.Method = "POST"
	}

	u.Body.SetPrefix(requests.TypeURLENCODED)

	if data[0] != '@' {
		u.Body.SetIOBody(data)
	} else {
		f, err := os.Open(data[1:])
		if err != nil {
			panic(err)
		}
		defer f.Close()
		bdata, err := ioutil.ReadAll(f)
		if err != nil {
			panic(err)
		}
		bdata = regexp.MustCompile("\n|\r").ReplaceAll(bdata, []byte(""))
		u.Body.SetIOBody(bdata)
	}
}

func parseHeader(u *CURL, soption string) {
	matches := regexp.MustCompile(`'([^:]+): ([^']+)'`).FindAllStringSubmatch(soption, 1)[0]
	key := matches[1]
	value := matches[2]

	switch key {
	case "Cookie":
		u.Cookies = ReadRawCookies(value, "")
		u.CookieJar.SetCookies(u.ParsedURL, u.Cookies)
	case "Content-Type":
		u.Body.SetPrefix(value)
	default:
		u.Header.Add(key, value)
	}

}