package ini

// Types of with values more readable for humans

import (
	"fmt"
	"net"
	"strconv"
	"strings"
	"time"
)

// IP is equalient to net.IP but with custom Marshaler-interface
type IP struct {
	net.IP
}

// MarshalINI will marshal the IP into IPv4 or IPv6 readable format, e.g
// 127.0.0.1 or ::
func (i *IP) MarshalINI() ([]byte, error) {
	if ip := i.To4(); ip != nil {
		return []byte(ip.String()), nil
	}

	if ip := i.To16(); ip != nil {
		return []byte(ip.String()), nil
	}

	return nil, nil
}

// UnmarshalINI will unmarshal the value produced by MarshalINI, e.g
// 127.0.0.1 or :: into a net.IP
func (i *IP) UnmarshalINI(b []byte) error {
	i.IP = net.ParseIP(string(b))
	return nil
}

// Time is equalient to time.Time but with custom Marshaler-interface
type Time struct {
	time.Time
}

// MarshalINI will marshal the time into RFC822
func (i *Time) MarshalINI() ([]byte, error) {
	if i.IsZero() {
		return nil, nil
	}

	return []byte(i.Format(time.RFC822)), nil
}

// UnmarshalINI will unmarshal the time from RFC822
func (i *Time) UnmarshalINI(b []byte) error {
	var err error

	(*i).Time, err = time.Parse(time.RFC822, string(b))

	return err
}

// Date is equalient to time.Time but with custom Marshaler-interface to store only the date
type Date struct {
	time.Time
}

// MarshalINI will marshal the time into a string of format y-d-m-timezone-offset
func (i *Date) MarshalINI() ([]byte, error) {
	if i.IsZero() {
		return nil, nil
	}
	y, m, d := i.Date()
	tz, off := i.Zone()
	return []byte(fmt.Sprintf("%d-%d-%d-%s-%d", y, m, d, tz, off)), nil
}

// UnmarshalINI will unmarshal a string formatted as y-m-d-timezone-offset
func (i *Date) UnmarshalINI(b []byte) error {

	(*i).Time = time.Now()

	spl := strings.Split(string(b), "-")

	if len(spl) != 5 {
		return fmt.Errorf("Invalid format %s, need d-m-y-tz-offset", string(b))
	}

	y, err := strconv.ParseInt(spl[0], 10, 32)

	if err != nil {
		return err
	}

	m, err := strconv.ParseInt(spl[1], 10, 32)

	if err != nil {
		return err
	}

	d, err := strconv.ParseInt(spl[2], 10, 32)

	if err != nil {
		return err
	}

	off, err := strconv.ParseInt(spl[4], 10, 32)

	if err != nil {
		return err
	}

	l := time.FixedZone(spl[3], int(off))

	if err != nil {
		return err
	}

	diff := time.Date(int(y), time.Month(m), int(d), 0, 0, 0, 0, l).Sub(i.Time)
	i.Time.Add(diff)

	return nil
}