package config

import (
	"os"
	"time"

	"github.com/pelletier/go-toml/v2"
)

// File is the on-disk /etc/sift/config.toml.
type File struct {
	Listen       string   `toml:"listen"`
	UserAgent    string   `toml:"user_agent"`
	DenyPrefixes []string `toml:"deny_prefixes"`
	SelfIP       SelfIP   `toml:"self_ip"`
}

// SelfIP is the [self_ip] block.
type SelfIP struct {
	Sources      []string `toml:"sources"`
	Interval     string   `toml:"interval"`
	KeepPrevious string   `toml:"keep_previous"`
	Path         string   `toml:"path"`
}

// Load reads path. A missing file returns a zero File and a nil error.
func Load(path string) (File, error) {
	var f File
	b, err := os.ReadFile(path)
	if err != nil {
		if os.IsNotExist(err) {
			return f, nil
		}
		return f, err
	}
	if err := toml.Unmarshal(b, &f); err != nil {
		return File{}, err
	}
	return f, nil
}

func ParseDuration(s string, def time.Duration) time.Duration {
	if s == "" {
		return def
	}
	d, err := time.ParseDuration(s)
	if err != nil {
		return def
	}
	return d
}