package main

import (
	"fmt"
	"io"
	"net/http"
	"os"
	"strings"
	"time"
)

const networkTopologyDir string = "topo-network/"
const containerTopologyDir string = "topo-containers/"

type Stanza struct {
	content string
	pad     int
}

type ActionResult struct {
	Err       error
	Desc      string
	ErrOutput string
	StdOutput string
}

type JsonResult struct {
	Code      int
	Desc      string
	ErrOutput string
	StdOutput string
}

func assertFileSize(f1, f2 string) error {
	fi1, err := os.Stat(f1)
	if err != nil {
		return err
	}

	fi2, err1 := os.Stat(f2)
	if err1 != nil {
		return err1
	}

	if fi1.Size() != fi2.Size() {
		return fmt.Errorf("file sizes differ (%d vs %d)", fi1.Size(), fi2.Size())
	}
	return nil
}

func (c *Stanza) newStanza(name string) *Stanza {
	c.append("\n" + name + " {")
	c.pad += 2
	return c
}

func (c *Stanza) append(name string) *Stanza {
	c.content += strings.Repeat(" ", c.pad)
	c.content += name + "\n"
	return c
}

func (c *Stanza) close() *Stanza {
	c.content += "}\n"
	c.pad -= 2
	return c
}

func (s *Stanza) toString() string {
	return s.content
}

func (s *Stanza) saveToFile(fileName string) error {
	fo, err := os.Create(fileName)
	if err != nil {
		return err
	}
	defer fo.Close()

	_, err = io.Copy(fo, strings.NewReader(s.content))
	return err
}

// newHttpClient creates [http.Client] with disabled proxy and redirects, it also sets timeout to 30seconds.
func newHttpClient() *http.Client {
	transport := http.DefaultTransport
	transport.(*http.Transport).Proxy = nil
	transport.(*http.Transport).DisableKeepAlives = true
	client := &http.Client{
		Transport: transport,
		Timeout:   time.Second * 30,
		CheckRedirect: func(req *http.Request, via []*http.Request) error {
			return http.ErrUseLastResponse
		}}
	return client
}