package config

import "fmt"

type MaclistAction string

const (
	MaclistAccept MaclistAction = "accept"
	MaclistDrop   MaclistAction = "drop"
	MaclistReject MaclistAction = "reject"
)

type MaclistEntry struct {
	Action    MaclistAction `yaml:"action"`
	Interface string        `yaml:"interface"`
	MAC       string        `yaml:"mac,omitempty"`
	Addresses []string      `yaml:"addresses,omitempty"`
	Log       string        `yaml:"log,omitempty"`
	Comment   string        `yaml:"comment,omitempty"`
}

var validMaclistActions = map[MaclistAction]bool{
	MaclistAccept: true, MaclistDrop: true, MaclistReject: true,
}

func (c *Config) validateMaclist() error {
	// Build a set of configured interface names for lookup.
	ifaceSet := make(map[string]bool, len(c.Interfaces))
	for _, iface := range c.Interfaces {
		ifaceSet[iface.Interface] = true
	}

	for i, m := range c.Maclist {
		if !validMaclistActions[m.Action] {
			return fmt.Errorf("maclist[%d]: unknown action %q", i, m.Action)
		}

		if m.Interface == "" {
			return fmt.Errorf("maclist[%d]: interface required", i)
		}

		if m.MAC == "" && len(m.Addresses) == 0 {
			return fmt.Errorf("maclist[%d]: mac or addresses required", i)
		}

		if !ifaceSet[m.Interface] {
			return fmt.Errorf("maclist[%d]: interface %q not defined in config", i, m.Interface)
		}
	}
	return nil
}