package goonvif

import (
	"context"
	"errors"
	"net"
	"net/http"
	"strings"

	search_sdk "git.pyer.club/kingecg/goonvif/sdk/search"
	"git.pyer.club/kingecg/goonvif/search"
	"github.com/beevik/etree"
	"github.com/use-go/onvif"
	device "github.com/use-go/onvif/device"
	sdk "github.com/use-go/onvif/sdk/device"
	wsdiscovery "github.com/use-go/onvif/ws-discovery"
)

type Device struct {
	onvif.DeviceParams
	device *onvif.Device
	ctx    context.Context
}

var ErrAuthRequired = errors.New("auth required")

func NewDevice(params onvif.DeviceParams) *Device {
	return &Device{DeviceParams: params, ctx: context.Background()}
}

func (d *Device) check() error {
	if d.device != nil {
		return nil
	}
	if d.Username == "" || d.Password == "" {
		return ErrAuthRequired
	}
	if d.HttpClient == nil {
		d.HttpClient = new(http.Client)
	}

	device, err := onvif.NewDevice(d.DeviceParams)
	if err != nil {
		return err
	}
	d.device = device
	return nil
}
func (d *Device) GetCapabilities() (interface{}, error) {
	err := d.check()
	if err != nil {
		return nil, err
	}
	cap := device.GetCapabilities{Category: "All"}

	getCapabilitiesResponse, err := sdk.Call_GetCapabilities(d.ctx, d.device, cap)
	if err != nil {
		return nil, err
	}
	r := getCapabilitiesResponse.Capabilities
	return r, err
}

func (d *Device) GetRecordingSummary() (search.RecordingSummary, error) {
	err := d.check()
	if err != nil {
		return search.RecordingSummary{}, err
	}
	resp, rerr := search_sdk.Call_GetRecordingSummary(d.ctx, d.device, search.GetRecordingSummary{})
	if rerr != nil {
		return search.RecordingSummary{}, rerr
	}
	return resp.Summary, nil
}

func (d *Device) GetEndpoints() (map[string]string, error) {
	err := d.check()
	if err != nil {
		return nil, err
	}
	return d.device.GetServices(), nil
}
func GetAvailableDevicesAtSpecificEthernetInterface(interfaceName string) ([]Device, error) {
	// Call a ws-discovery Probe Message to Discover NVT type Devices
	devices, err := wsdiscovery.SendProbe(interfaceName, nil, []string{"dn:" + onvif.NVT.String()}, map[string]string{"dn": "http://www.onvif.org/ver10/network/wsdl"})
	if err != nil {
		return nil, err
	}

	nvtDevicesSeen := make(map[string]bool)
	nvtDevices := make([]Device, 0)

	for _, j := range devices {
		doc := etree.NewDocument()
		if err := doc.ReadFromString(j); err != nil {
			return nil, err
		}

		for _, xaddr := range doc.Root().FindElements("./Body/ProbeMatches/ProbeMatch/XAddrs") {
			xaddr := strings.Split(strings.Split(xaddr.Text(), " ")[0], "/")[2]
			if !nvtDevicesSeen[xaddr] {
				dev := NewDevice(onvif.DeviceParams{Xaddr: strings.Split(xaddr, " ")[0]})
				nvtDevicesSeen[xaddr] = true
				nvtDevices = append(nvtDevices, *dev)
			}
		}
	}

	return nvtDevices, nil
}

func Discovery() ([]Device, error) {
	ifaces, err := listLocalNetworkInterfaces()
	if err != nil {
		return nil, err
	}

	devices := make([]Device, 0)

	for _, iface := range ifaces {
		idevices, err := GetAvailableDevicesAtSpecificEthernetInterface(iface)
		if err != nil {
			continue
		}
		devices = append(devices, idevices...)
	}

	return devices, nil

}

func listLocalNetworkInterfaces() ([]string, error) {

	interfaces, err := net.Interfaces()
	if err != nil {
		return nil, err
	}

	var ifaceNames []string
	for _, iface := range interfaces {
		// 判断是否为局域网
		if (iface.Flags&net.FlagUp) == 0 || (iface.Flags&net.FlagRunning) == 0 || (iface.Flags&net.FlagLoopback) != 0 {
			continue
		}
		ifaceNames = append(ifaceNames, iface.Name)
	}

	return ifaceNames, nil
}

func Init() {
	onvif.Xlmns["tse"] = "https://www.onvif.org/ver10/search.wsdl"
}