package proxies

import (
	"bufio"
	"fmt"
	"io"
	"log"
	"net/http"
	"net/url"
	"os"
)

//https://www.reddit.com/r/golang/comments/ezg1ka/how_can_i_specify_a_proxy_server_when_using/

func Default() []*http.Client {
	clis, err := ParseProxiesFromFile("./proxies.list")
	if err != nil {
		log.Fatal(err)
	}
	return clis
}

func ParseProxiesFromFile(fileName string) ([]*http.Client, error) {
	f, err := os.OpenFile(fileName, os.O_RDONLY, 0400)
	if err != nil {
		return nil, err
	}
	defer f.Close()

	return ParseProxies(f)
}

func ParseProxies(r io.Reader) ([]*http.Client, error) {
	clients := make([]*http.Client, 0)

	scanner := bufio.NewScanner(r)

	for scanner.Scan() {
		proxyURL, err := url.Parse(scanner.Text())
		if err != nil {
			return nil, fmt.Errorf("url parse %s: %w", scanner.Text(), err)
		}

		transport := &http.Transport{
			Proxy: http.ProxyURL(proxyURL),
		}

		client := &http.Client{Transport: transport}

		clients = append(clients, client)

		log.Printf("using %s as proxy", scanner.Text())
	}

	if len(clients) == 0 {
		clients = append(clients, &http.Client{})
	}

	return clients, nil
}