package ui

import (
	"fmt"
)

// DryRun tracks dry-run mode operations
type DryRun struct {
	Enabled    bool
	Operations []DryRunOp
}

// DryRunOp represents a single operation that would be performed
type DryRunOp struct {
	Component   string // e.g., "VM", "DNS", "Restore"
	Action      string // e.g., "Create", "Update", "Delete"
	Description string
}

// NewDryRun creates a dry-run tracker
func NewDryRun(enabled bool) *DryRun {
	return &DryRun{
		Enabled:    enabled,
		Operations: make([]DryRunOp, 0),
	}
}

// AddOperation records an operation
func (d *DryRun) AddOperation(component, action, description string) {
	d.Operations = append(d.Operations, DryRunOp{
		Component:   component,
		Action:      action,
		Description: description,
	})
}

// Print displays all recorded operations
func (d *DryRun) Print() {
	if !d.Enabled {
		return
	}

	fmt.Println("\n" + HeaderLine("DRY RUN - No changes will be made"))
	fmt.Println()

	if len(d.Operations) == 0 {
		fmt.Println("No operations would be performed.")
		return
	}

	for i, op := range d.Operations {
		fmt.Printf("%d. [%s] %s: %s\n", i+1, op.Component, op.Action, op.Description)
	}

	fmt.Println()
	fmt.Println("To execute these operations, run with --yes flag")
}

// HeaderLine creates a formatted header
func HeaderLine(title string) string {
	return fmt.Sprintf("=== %s ===", title)
}

// TablePrint prints data as a simple table
func TablePrint(headers []string, rows [][]string) {
	// Calculate column widths
	widths := make([]int, len(headers))
	for i, h := range headers {
		widths[i] = len(h)
	}
	for _, row := range rows {
		for i, cell := range row {
			if i < len(widths) && len(cell) > widths[i] {
				widths[i] = len(cell)
			}
		}
	}

	// Print header
	for i, h := range headers {
		fmt.Printf("%-*s  ", widths[i], h)
	}
	fmt.Println()

	// Print separator
	for i := range headers {
		fmt.Printf("%s  ", repeat("-", widths[i]))
	}
	fmt.Println()

	// Print rows
	for _, row := range rows {
		for i, cell := range row {
			if i < len(widths) {
				fmt.Printf("%-*s  ", widths[i], cell)
			}
		}
		fmt.Println()
	}
}

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