package openwrt

import (
	"log"
	"strings"
	"time"
)

// Wifi gives access to al OpenWRT Wifi operations
type Wifi struct {
	exec  Executor
	iface string
	Cells []*WifiCell
}

// NewWifi return an UCI instance to interact with UCI
func NewWifi(wIface string) *Wifi {
	exec := &localExecutor{}
	iface := wIface
	return &Wifi{exec, iface, nil}
}

// NewWifiWithExecutor returns a Wifi Instance an gives you the ability to provide
// a different command executor than the default one.
func NewWifiWithExecutor(exec Executor, wIface string) *Wifi {
	return &Wifi{exec, wIface, nil}
}

func (w *Wifi) getEncryption(line string) string {
	enc := "unkn"
	if strings.Contains(line, "WPA2 PSK") {
		enc = "psk"
	} else if strings.Contains(line, "none") {
		enc = "none"
	}
	return enc
}

func (w *Wifi) parseWifiCells(stdout string) int {
	new := false
	mac, ssid, enc := "", "", ""
	for _, line := range strings.Split(strings.TrimSuffix(stdout, "\n"), "\n") {
		if strings.HasPrefix(line, "Cell") && new == false {
			new = true
			mac = strings.Split(line, " ")[4]
		}
		if strings.Contains(line, "ESSID:") {
			ssid = strings.Split(line, " ")[1]
			ssid = strings.Trim(ssid, "\"")
		}
		if strings.Contains(line, "Encryption:") {
			enc = w.getEncryption(line)
		}
		if len(mac) > 0 && len(ssid) > 0 && len(enc) > 0 {
			cell := NewWifiCell(ssid, mac, enc)
			w.Cells = append(w.Cells, cell)
			ssid, mac, enc = "", "", ""
			new = false
		}
	}
	return 0
}

// GetWifiCells retrieves all available wifi cells for a card !
func (w *Wifi) GetWifiCells() int {
	res := w.exec.Run("iwinfo", w.iface, "scan")
	if res.ReturnCode != 0 {
		log.Fatal(res.Stderr)
		return res.ReturnCode
	}

	for res.Stdout == "Scanning not possible" {
		time.Sleep(time.Second)
		res = w.exec.Run("iwinfo", w.iface, "scan")
		if res.ReturnCode != 0 {
			log.Fatal(res.Stderr)
			return res.ReturnCode
		}
	}
	return w.parseWifiCells(res.Stdout)
}

// GetCell retreives an WifiCell by SSID provided in parameter
func (w *Wifi) GetCell(ssid string) *WifiCell {
	for _, v := range w.Cells {
		if v.Ssid == ssid {
			return v
		}
	}
	return nil
}