package reach

import (
	"sync"

	"forge.cadoles.com/Pyxis/golang-socketio"
	"github.com/pkg/errors"
)

const (
	eventGetSavedWifiNetworks     = "get saved wifi networks"
	eventSavedWifiNetworkResults  = "wifi saved networks results"
	eventAddWifiNetwork           = "add new network"
	eventAddWifiNetworkResults    = "add network results"
	eventRemoveWifiNetwork        = "remove network"
	eventRemoveWifiNetworkResults = "remove network results"
	eventConnectToNetwork         = "connect to network"
)

// WifiSecurity is a WiFi network security algorithm
type WifiSecurity string

const (
	// SecurityWPAPSK WPA-PSK wifi network
	SecurityWPAPSK WifiSecurity = "wpa-psk"
	// SecurityOpen Open wifi network
	SecurityOpen WifiSecurity = "open"
)

// WifiNetwork is a ReachRS module's saved wifi network
// Raw messages examples:
// [{"ssid":"Cadoles","password":"...","security":"wpa-psk","identity":""}]
// [{"is_visible":false,"connected":false,"ssid":"Cadoles","security":"wpa-psk","is_connected":false,"is_added":true}]]
type WifiNetwork struct {
	SSID      string       `json:"ssid"`
	Password  string       `json:"password"`
	Security  WifiSecurity `json:"security"`
	Identity  string       `json:"identity"`
	Visible   bool         `json:"is_visible"`
	Connected bool         `json:"is_connected"`
	Added     bool         `json:"is_added"`
}

// SavedWifiNetworks returns the ReachRS module saved wifi networks
func (c *Client) SavedWifiNetworks() ([]*WifiNetwork, error) {

	var err error
	var wifiNetworks []*WifiNetwork
	var wg sync.WaitGroup

	wg.Add(1)

	err = c.conn.On(eventSavedWifiNetworkResults, func(h *gosocketio.Channel, wn []*WifiNetwork) {
		wifiNetworks = wn
		c.conn.Off(eventSavedWifiNetworkResults)
		wg.Done()
	})
	if err != nil {
		return nil, errors.Wrapf(err, "error while binding to '%s' event", eventSavedWifiNetworkResults)
	}

	c.logf("sending '%s' event", eventGetSavedWifiNetworks)
	if err = c.conn.Emit(eventGetSavedWifiNetworks, nil); err != nil {
		return nil, errors.Wrapf(err, "error while emitting '%s' event", eventGetSavedWifiNetworks)
	}
	c.logf("'%s' event sent", eventGetSavedWifiNetworks)

	wg.Wait()

	return wifiNetworks, err

}

// AddWifiNetwork asks the ReachRS module to save the given wifi network informations
func (c *Client) AddWifiNetwork(ssid string, security WifiSecurity, password string) (bool, error) {

	var err error
	var wg sync.WaitGroup
	var done bool

	wg.Add(1)

	err = c.conn.On(eventAddWifiNetworkResults, func(h *gosocketio.Channel, d bool) {
		done = d
		c.conn.Off(eventAddWifiNetworkResults)
		wg.Done()
	})
	if err != nil {
		return false, errors.Wrapf(err, "error while binding to '%s' event", eventAddWifiNetworkResults)
	}

	wn := &WifiNetwork{
		SSID:     ssid,
		Security: security,
		Password: password,
	}

	c.logf("sending '%s' event", eventAddWifiNetwork)
	if err = c.conn.Emit(eventAddWifiNetwork, wn); err != nil {
		return false, errors.Wrapf(err, "error while emitting '%s' event", eventAddWifiNetwork)
	}
	c.logf("'%s' event sent", eventAddWifiNetwork)

	wg.Wait()

	return done, err

}

// RemoveWifiNetwork asks the ReachRS module to remove the given WiFi network
func (c *Client) RemoveWifiNetwork(ssid string) (bool, error) {

	var err error
	var wg sync.WaitGroup
	var done bool

	wg.Add(1)

	err = c.conn.On(eventRemoveWifiNetworkResults, func(h *gosocketio.Channel, d bool) {
		done = d
		c.conn.Off(eventRemoveWifiNetworkResults)
		wg.Done()
	})
	if err != nil {
		return false, errors.Wrapf(err, "error while binding to '%s' event", eventRemoveWifiNetworkResults)
	}

	c.logf("sending '%s' event", eventRemoveWifiNetwork)
	if err := c.conn.Emit(eventRemoveWifiNetwork, ssid); err != nil {
		return false, errors.Wrapf(err, "error while emitting '%s' event", eventRemoveWifiNetwork)
	}
	c.logf("'%s' event sent", eventRemoveWifiNetwork)

	wg.Wait()

	return done, nil

}

// ConnectToWifiNetwork asks the ReachRS module to connect to the given WiFi network
func (c *Client) ConnectToWifiNetwork(ssid string) error {
	c.logf("sending '%s' event", eventConnectToNetwork)
	if err := c.conn.Emit(eventConnectToNetwork, ssid); err != nil {
		return errors.Wrapf(err, "error while emitting '%s' event", eventConnectToNetwork)
	}
	c.logf("'%s' event sent", eventConnectToNetwork)
	return nil
}