package main

import (
    "fmt"
    "io/ioutil"
    "log"
    "math/rand"
    "net/http"
    "os"
)

func check(e error) {
    if e != nil {
        panic(e)
    }
}

type Object struct {
    url string
}

func ReadByIoutil(filePath string) string {

    file, err := ioutil.ReadFile(filePath)
    check(err)
    data := string(file)
    return data
}
func WriteByOs(filePath string, data string) {
    file, err := os.Create(filePath)
    check(err)
    defer file.Close()
    _, err = file.WriteString(data)
    check(err)
}
func ParseData(data string) []Object {
    var counter = 0
    var answer string
    var array []Object
    var buffer Object
    for i := 0; i < len(data); i++ {
        switch data[i] {
        case ';':
            {
                buffer.url = answer
                array = append(array, buffer)
                answer = ""
                counter++
            }
        case ' ':
            { /*continue*/
            }
        default:
            answer += string(data[i])
        }
    }

    buffer.url = answer
    array = append(array, buffer)
    answer = ""

    return array
}
func ReadWriteHandler() {

    data := ReadByIoutil("file.txt")
    array := ParseData(data)

    var i = 0
    for i < len(array) {
        fmt.Println(array[i].url)
        i++
    }

    /* stringify (not json) */
    var answer string
    for i := 0; i < len(data); i++ {
        if data[i] == ';' {
            answer += "\n"
        } else if data[i] == ' ' {
            continue
        } else {
            answer += string(data[i])
        }
    }
    /* PUSHING TEMP TO NEW FILE*/
    WriteByOs("file2.txt", answer)

}

func AddForm(url string) string {
    if url == "" {
        data := ReadByIoutil("file.txt")
        array := ParseData(data)
        url = "https://"
        url += array[rand.Intn(len(array))].url
        log.Print(url)
    }
    resp, err := http.Get(url)
    check(err)
    defer resp.Body.Close()
    body, err := ioutil.ReadAll(resp.Body)
    content := string(body)
    WriteByOs("index.html", content)
    return content
}

func handler(w http.ResponseWriter, r *http.Request) {
    url := r.FormValue("url")
    if url == "" {
        w.Header().Set("Content-Type", "text/html; charset=utf-8")
        url = ""
        //url = "https://yandex.ru"
        fmt.Fprint(w, AddForm(url))
        return
    }
}

func main() {
    /* Dont pay attention on that. It's a test */
    ReadWriteHandler()
    /* START LOCALHOST SERVER */
    http.HandleFunc("/test", handler)

    err := http.ListenAndServe(":8080", nil)
    if err != nil {
        log.Fatal(err.Error())
    }

}