package zones

import (
	"bytes"
	"context"
	"fmt"
	"log"
	"net/netip"
	"os"
	"time"

	"git.jpi.io/amery/jpictl/pkg/wireguard"
)

// GetWireguardConfig reads a wgN.conf file
func (m *Machine) GetWireguardConfig(ring int) (*wireguard.Config, error) {
	data, err := m.ReadFile("wg%v.conf", ring)
	if err != nil {
		return nil, err
	}

	r := bytes.NewReader(data)
	return wireguard.NewConfigFromReader(r)
}

func (m *Machine) tryWireguardZeroConfig() error {
	wg, err := m.GetWireguardConfig(0)
	switch {
	case os.IsNotExist(err):
		return nil
	case err != nil:
		return err
	default:
		return m.applyWireguardZeroConfig(wg)
	}
}

func (m *Machine) applyWireguardZeroConfig(wg *wireguard.Config) error {
	addr := wg.GetAddress()
	zoneID, nodeID, ok := ParseRingZeroAddress(addr)
	if !ok {
		return fmt.Errorf("%s: invalid %s address: %s", m.Name, "wg1", addr)
	}

	if err := m.applyZoneNodeID(zoneID, nodeID); err != nil {
		return err
	}

	log.Println(m.Name, "wg0", addr, zoneID, nodeID)
	return nil
}

func (m *Machine) tryWireguardOneConfig() error {
	wg, err := m.GetWireguardConfig(1)
	switch {
	case os.IsNotExist(err):
		return nil
	case err != nil:
		return err
	default:
		return m.applyWireguardOneConfig(wg)
	}
}

func (m *Machine) applyWireguardOneConfig(wg *wireguard.Config) error {
	addr := wg.GetAddress()
	zoneID, nodeID, ok := ParseRingOneAddress(addr)
	if !ok {
		return fmt.Errorf("%s: invalid %s address: %s", m.Name, "wg1", addr)
	}

	if err := m.applyZoneNodeID(zoneID, nodeID); err != nil {
		return err
	}

	log.Println(m.Name, "wg1", addr, zoneID, nodeID)
	return nil
}

func (*Machine) applyZoneNodeID(_, _ int) error {
	return nil
}

func (m *Machine) lookupNetIP() ([]netip.Addr, error) {
	timeout := 2 * time.Second
	ctx, cancel := context.WithTimeout(context.Background(), timeout)

	defer cancel()

	return m.zone.zones.resolver.LookupNetIP(ctx, "ip", m.FullName())
}

func (m *Machine) updatePublicAddresses() error {
	addrs, err := m.lookupNetIP()
	if err != nil {
		return err
	}

	m.PublicAddresses = addrs
	return nil
}

func (m *Machine) scan() error {
	if err := m.tryWireguardZeroConfig(); err != nil {
		return err
	}

	if err := m.tryWireguardOneConfig(); err != nil {
		return err
	}

	return m.updatePublicAddresses()
}