package lib

import (
	"archive/tar"
	"bytes"
	"compress/gzip"
	"errors"
	"fmt"
	"io"
	"strings"
	"time"

	"github.com/gofiber/fiber/v2"
)

func RenderError(c *fiber.Ctx, code int) error{
  var msg string = "Server Error"
  c.Status(code)

  switch code {
  case 404:
    msg = "Not Found"
  }

  return c.Render("error", fiber.Map{
    "msg": msg,
  })
}

func SizeFromBytes(size int) string {
  if(size > 1024*1024*1024) {
    return fmt.Sprintf("%dGB", (size/1024/1024/1024))
  }else if(size > 1024*1024) {
    return fmt.Sprintf("%dMB", (size/1024/1024))
  }else if(size > 1024) { 
    return fmt.Sprintf("%dKB", (size/1024))
  }
  return fmt.Sprintf("%dB", size)
}

func ExtractFile(raw []byte, file string) (string, error){
  stream := bytes.NewReader(raw) 
  ustream, err := gzip.NewReader(stream)
  if err != nil {
    return "", err
  }

  reader := tar.NewReader(ustream)
  var header *tar.Header
    
  for header, err = reader.Next(); err == nil; header, err = reader.Next() {
    if header.Typeflag != tar.TypeReg {
      return "", errors.New("Found invalid entry in archive")
    }

    if header.Name != file {
      continue
    }

    buf := new(strings.Builder)
    _, err := io.Copy(buf, reader)
    if err != nil {
      return "", errors.New("Failed to extract file to memory")
    }

    return buf.String(), nil
  }

  return "", errors.New("File not found")
}

func GetTimePassed(t time.Time) string {
  diff := time.Since(t)
  res := fmt.Sprintf(
    "%ds ago", 
    int(diff.Seconds()),
  )

  if diff.Minutes() > 1 { 
    res = fmt.Sprintf(
      "%dm and %ds ago", 
      int(diff.Minutes()), int(diff.Seconds())-(int(diff.Minutes())*60),
    )
  }

  if diff.Hours() > 1 {
    res = fmt.Sprintf("%dh and %dm ago", 
      int(diff.Hours()),
      int(diff.Minutes())-(int(diff.Hours())*60), 
    )
  }

  return res
}

func CleanString(s string) string{
  var badchars []string = []string{"~", "'", "\"", "/", "<", ">", "?", "=", "#", "(", ")", "{", "}", "*", "!", "`", "[", "]"}

  for _, c := range badchars {
    s = strings.ReplaceAll(s, c, "")
  } 

  return s
}