package geoip2

import (
	"context"
	"errors"
	"fmt"
	"net/netip"
	"strings"
)

// ErrNotFound is returned when the database does not contain the IP address.
var ErrNotFound = errors.New("not found")

// Info is a structure that contains information about the IP address.
type Info struct {
	// IP is the IP address.
	IP netip.Addr
	// ISOCode is the ISO code of the country.
	ISOCode string
	// Continent is the continent.
	Continent string
	// Country is the country.
	Country string
	// City is the city.
	City string
	// CitySubdivisions is the list of subdivisions.
	CitySubdivisions []string
	// TimeZone is the time zone.
	TimeZone string
}

// ToString returns a string representation of the Info structure.
func (i Info) ToString() string {
	var data []string

	if i.Continent != "" {
		data = append(data, i.Continent)
	}

	if i.ISOCode != "" {
		data = append(data, i.ISOCode)
	}

	if i.Country != "" {
		data = append(data, i.Country)
	}

	if len(i.CitySubdivisions) > 0 {
		data = append(data, strings.Join(i.CitySubdivisions, ", "))
	}

	if i.City != "" {
		data = append(data, i.City)
	}

	return fmt.Sprintf("%s (%s) time zone: %s",
		i.IP.String(),
		strings.Join(data, "/"),
		i.TimeZone,
	)
}

// GeoIP2 is an interface for geoip2.
type GeoIP2 interface {
	Info(ip netip.Addr) (Info, error)
}

// RefreshableGeoIP2 is an interface for geoip2 with refresh and close functionality.
type RefreshableGeoIP2 interface {
	GeoIP2
	Refresh(ctx context.Context) error
	Close() error
}

// Logger is an interface for logging.
type Logger interface {
	// Error logs an error.
	Error(err error)
}