DebTik/internal/cli/formatter.go

package cli

import (
	"fmt"
	"strings"
)

const (
	ColorReset   = "\033[0m"
	ColorBold    = "\033[1m"
	ColorDim     = "\033[2m"
	ColorRed     = "\033[31m"
	ColorGreen   = "\033[32m"
	ColorYellow  = "\033[33m"
	ColorBlue    = "\033[34m"
	ColorMagenta = "\033[35m"
	ColorCyan    = "\033[36m"
	ColorWhite   = "\033[37m"
)

func Banner(version, username, role, hostname string) string {
	var sb strings.Builder
	sb.WriteString("\n")
	sb.WriteString(ColorCyan + ColorBold)
	sb.WriteString("  ____       _   _____ _ _    \n")
	sb.WriteString(" |  _ \\  ___| |_|_   _(_) | __\n")
	sb.WriteString(" | | | |/ _ \\ '_ \\| | | | |/ /\n")
	sb.WriteString(" | |_| |  __/ |_) | | | |   < \n")
	sb.WriteString(" |____/ \\___|_.__/|_| |_|_|\\_\\\n")
	sb.WriteString(ColorReset)
	sb.WriteString(ColorBold + " DebTik Network Appliance Controller" + ColorReset + "\n")
	sb.WriteString(fmt.Sprintf(ColorDim+" Appliance Hostname : %s%s\n", hostname, ColorReset))
	sb.WriteString(fmt.Sprintf(ColorDim+" Authenticated User : %s%s%s (Role: %s%s%s)\n", ColorGreen, username, ColorDim, ColorYellow, strings.ToUpper(role), ColorDim))
	sb.WriteString(ColorDim + " Type 'help' or '?' for available commands.\n" + ColorReset)
	sb.WriteString("\n")
	return sb.String()
}

// TableWriter formats aligned text tables with custom columns
type TableWriter struct {
	headers []string
	rows    [][]string
}

func NewTable(headers ...string) *TableWriter {
	return &TableWriter{
		headers: headers,
		rows:    make([][]string, 0),
	}
}

func (t *TableWriter) AddRow(cols ...string) {
	t.rows = append(t.rows, cols)
}

func (t *TableWriter) String() string {
	return t.Render()
}

func (t *TableWriter) Render() string {
	if len(t.headers) == 0 {
		return ""
	}

	colWidths := make([]int, len(t.headers))
	for i, h := range t.headers {
		colWidths[i] = len(h)
	}

	for _, row := range t.rows {
		for i, cell := range row {
			if i < len(colWidths) {
				cleanLen := len(stripANSI(cell))
				if cleanLen > colWidths[i] {
					colWidths[i] = cleanLen
				}
			}
		}
	}

	var sb strings.Builder
	// Render Header
	sb.WriteString(ColorCyan + ColorBold)
	for i, h := range t.headers {
		pad := colWidths[i] - len(h)
		sb.WriteString(fmt.Sprintf(" %s%s ", h, strings.Repeat(" ", max(0, pad))))
	}
	sb.WriteString(ColorReset + "\n")

	// Render separator
	sb.WriteString(ColorDim)
	for i := range t.headers {
		sb.WriteString(fmt.Sprintf(" %s ", strings.Repeat("-", colWidths[i])))
	}
	sb.WriteString(ColorReset + "\n")

	// Render Rows
	for _, row := range t.rows {
		for i := range t.headers {
			cell := ""
			if i < len(row) {
				cell = row[i]
			}
			cleanLen := len(stripANSI(cell))
			pad := colWidths[i] - cleanLen
			sb.WriteString(fmt.Sprintf(" %s%s ", cell, strings.Repeat(" ", max(0, pad))))
		}
		sb.WriteString("\n")
	}

	return sb.String()
}

func stripANSI(str string) string {
	var clean strings.Builder
	inEsc := false
	for _, r := range str {
		if r == 0x1b { // ESC
			inEsc = true
			continue
		}
		if inEsc {
			if (r >= 'a' && r <= 'z') || (r >= 'A' && r <= 'Z') {
				inEsc = false
			}
			continue
		}
		clean.WriteRune(r)
	}
	return clean.String()
}

func max(a, b int) int {
	if a > b {
		return a
	}
	return b
}