package navigation

import "strings"

// Common route guards

// AuthGuard checks if user is authenticated
func AuthGuard(isAuthenticated func() bool) RouteGuard {
	return func(route *Route, params map[string]string) bool {
		return isAuthenticated()
	}
}

// RoleGuard checks if user has required role
func RoleGuard(userRole func() string, requiredRole string) RouteGuard {
	return func(route *Route, params map[string]string) bool {
		return userRole() == requiredRole
	}
}

// PermissionGuard checks if user has specific permission
func PermissionGuard(hasPermission func(permission string) bool, permission string) RouteGuard {
	return func(route *Route, params map[string]string) bool {
		return hasPermission(permission)
	}
}

// ParamValidationGuard validates route parameters
func ParamValidationGuard(validator func(params map[string]string) bool) RouteGuard {
	return func(route *Route, params map[string]string) bool {
		return validator(params)
	}
}

// PathPrefixGuard checks if the current path starts with a specific prefix
func PathPrefixGuard(prefix string) RouteGuard {
	return func(route *Route, params map[string]string) bool {
		currentPath := GetCurrentPath()
		return strings.HasPrefix(currentPath, prefix)
	}
}

// CombineGuards combines multiple guards with AND logic
func CombineGuards(guards ...RouteGuard) RouteGuard {
	return func(route *Route, params map[string]string) bool {
		for _, guard := range guards {
			if !guard(route, params) {
				return false
			}
		}
		return true
	}
}

// AnyGuard combines multiple guards with OR logic
func AnyGuard(guards ...RouteGuard) RouteGuard {
	return func(route *Route, params map[string]string) bool {
		for _, guard := range guards {
			if guard(route, params) {
				return true
			}
		}
		return false
	}
}

// Example usage patterns:

// AdminOnlyGuard - combines authentication and role checks
func AdminOnlyGuard(isAuth func() bool, userRole func() string) RouteGuard {
	return CombineGuards(
		AuthGuard(isAuth),
		RoleGuard(userRole, "admin"),
	)
}

// NumericIdGuard - validates that :id parameter is numeric
func NumericIdGuard() RouteGuard {
	return ParamValidationGuard(func(params map[string]string) bool {
		if id, exists := params["id"]; exists {
			// Simple numeric check
			for _, char := range id {
				if char < '0' || char > '9' {
					return false
				}
			}
			return len(id) > 0
		}
		return true // No id param, so validation passes
	})
}