package model

import "strings"

// sanitizeShareName creates a valid ShareName matching the regex: ^[a-z0-9]+([a-z\-\_0-9]+|(__)?)[a-z0-9]*$
func SanitizeShareName(name string) string {
	// Convert to lowercase and replace spaces with hyphens
	shareName := strings.ToLower(name)
	shareName = strings.ReplaceAll(shareName, " ", "-")

	// Remove any characters that aren't lowercase letters, numbers, hyphens, or underscores
	var validShareName strings.Builder
	for _, r := range shareName {
		if (r >= 'a' && r <= 'z') || (r >= '0' && r <= '9') || r == '-' || r == '_' {
			validShareName.WriteRune(r)
		}
	}

	result := validShareName.String()
	if result == "" {
		return "matrixbridge" // fallback if no valid characters
	}

	// Ensure it starts with alphanumeric
	for result != "" && (result[0] == '-' || result[0] == '_') {
		result = result[1:]
	}

	// Ensure it ends with alphanumeric
	for result != "" && (result[len(result)-1] == '-' || result[len(result)-1] == '_') {
		result = result[:len(result)-1]
	}

	// Final fallback check
	if result == "" {
		return "matrixbridge"
	}

	return result
}