package configuration

import (
	"errors"
	"fmt"
	"net"
)

var (
	errNNTPAddressIsEmpty     = errors.New("address is empty")
	errNNTPInvalidAddress     = errors.New("address is invalid")
	errNNTPInvalidConnTimeout = errors.New("connect timeout is invalid")
	errNNTPUserOrPassIsEmpty  = errors.New("username or password is empty")
)

// NNTP is an NNTP output configuration.
type NNTP struct {
	Address        string `json:"address"`
	Username       string `json:"username"`
	Password       string `json:"password"`
	ConnectTimeout int64  `json:"connect_timeout"`
}

// Validate validates configuration.
func (n *NNTP) Validate() error {
	if n.Address == "" {
		return fmt.Errorf("validate NNTP output configuration: %w", errNNTPAddressIsEmpty)
	}

	_, _, err := net.SplitHostPort(n.Address)
	if err != nil {
		return fmt.Errorf("validate NNTP output configuration: %w: %w", errNNTPInvalidAddress, err)
	}

	if (n.Username != "" && n.Password == "") || (n.Username == "" && n.Password != "") {
		return fmt.Errorf("validate NNTP output configuration: %w", errNNTPUserOrPassIsEmpty)
	}

	if n.ConnectTimeout < 1 {
		return fmt.Errorf("validate NNTP output configuration: %w", errNNTPInvalidConnTimeout)
	}

	return nil
}