package nvcs

import (
	"encoding/xml"
	"fmt"
	"io/ioutil"

	dac "github.com/xinsnake/go-http-digest-auth-client"
)

// 设置其他字符的第一个, 位置固定位7
// 摄像机信息暂时固定, 避免泄露
const (
	hikISAPIOverlay7SetUrl = "/ISAPI/System/Video/inputs/channels/1/overlays/text/7"
	cameraWebAddr          = "http://192.168.10.11:40080"
	cameraWebUser          = "admin"
	cameraWebPassword      = "a1234567"
)

var overlayText TextOverlay

type TextOverlay struct {
	Id               int64  `xml:"id"`
	Enabled          bool   `xml:"enabled"`
	PositionX        int64  `xml:"positionX"`
	PositionY        int64  `xml:"positionY"`
	DisplayText      string `xml:"displayText"`
	DirectAngle      string `xml:"directAngle"`
	IsPersistentText bool   `xml:"isPersistentText"`
}

func hikISAPIRequest(username, password, method, url, body string) ([]byte, error) {
	dr := dac.NewRequest(username, password, method, url, body)
	resp, err := dr.Execute()
	if err != nil {
		return nil, err
	}

	defer resp.Body.Close()

	return ioutil.ReadAll(resp.Body)
}

func addFloorToOSD(osdText string) error {
	overlay7Url := cameraWebAddr + hikISAPIOverlay7SetUrl

	// 获取左下角第一个字符的位置
	if overlayText.DisplayText == "" {
		rsp, err := hikISAPIRequest(cameraWebUser, cameraWebPassword, "GET", overlay7Url, "")
		if err != nil {
			return fmt.Errorf("get osd info. %s", err.Error())
		}

		err = xml.Unmarshal(rsp, &overlayText)
		if err != nil {
			return fmt.Errorf("xml unmarshal. %s", err.Error())
		}
	}

	if overlayText.DisplayText == osdText {
		return nil
	}

	overlayText.DisplayText = osdText
	body, _ := xml.Marshal(overlayText)
	_, err := hikISAPIRequest(cameraWebUser, cameraWebPassword, "PUT", overlay7Url, string(body))
	if err != nil {
		return fmt.Errorf("set osd. %s", err.Error())
	}

	return nil
}