package formatter

import (
	"fmt"
	"math"
	"os"
)

// FormatSize converts bytes to human-readable format
func FormatSize(bytes int64) string {
	if bytes == 0 {
		return "0 B"
	}

	const unit = 1024
	units := []string{"B", "KB", "MB", "GB", "TB", "PB"}

	exp := int(math.Log(float64(bytes)) / math.Log(float64(unit)))
	if exp > len(units)-1 {
		exp = len(units) - 1
	}

	value := float64(bytes) / math.Pow(float64(unit), float64(exp))
	return fmt.Sprintf("%.2f %s", value, units[exp])
}

// CenterText centers text within a given width
func CenterText(text string, width int) string {
	if len(text) >= width {
		return text[:width]
	}
	
	padding := width - len(text)
	left := padding / 2
	right := padding - left
	
	return fmt.Sprintf("%s%s%s", repeat(" ", left), text, repeat(" ", right))
}

func repeat(s string, count int) string {
	result := ""
	for i := 0; i < count; i++ {
		result += s
	}
	return result
}

func ReadFileContent(file *os.File) string {
	content := make([]byte, 0)
	buffer := make([]byte, 4096)
	for {
		n, err := file.Read(buffer)
		if n > 0 {
			content = append(content, buffer[:n]...)
		}
		if err != nil {
			break
		}
	}
	return string(content)
}