package main

import (
	"bytes"
	"encoding/json"
	"fmt"
	"io"
	"log"
	"net/http"
	"strconv"
	"strings"
	"time"
)

// Unifi Controller API processing
func processUcAPIs() ([]node, []link, error) {
	//get list of Unifi devices to display
	var nodes []node
	var links []link
	d := getDevices(conf.Unifi.UCDevicesURL)

	//call Unifi Controller
	ucAPI := UnifiNewAPI(conf.Unifi.User, conf.Unifi.Password, conf.Unifi.APIURL)
	//login
	if err := ucAPI.ucLogin(); err != nil {
		return nil, nil, err
	}
	//get all Sites from Controller
	sites, err := ucAPI.ucGetSites()
	if err != nil {
		return nil, nil, err
	}
	//get all devices in all sites
	devices, err := ucAPI.ucGetDevices(sites)
	if err != nil {
		return nil, nil, err
	}

	//build nodes struct
	//mvJson, err := getMeshviewerJSON()
	for _, jsonDevice := range d.Devices {
		var currentDevice ucDevice
		var currentJSONDevice device
		isOnline := currentDevice.State == 1
		for _, device := range devices {
			if strings.EqualFold(device.Mac, jsonDevice.MAC) {
				currentDevice = device
				currentJSONDevice = jsonDevice
			}
		}
		if isRemoteMACpublished(jsonDevice.MAC, d.Devices) {
			//hier muss gecheckt werden ob der link valide ist
			if checkMeshviewerLink(jsonDevice.LinkedTo) {
				links = UnifiAddLink(jsonDevice, links)
			}
		}
		load, err := strconv.ParseFloat(currentDevice.Sysstats.CPU, 64)
		if err != nil {
			log.Println("Error psrsing CPU load from ", currentDevice.Name)
			log.Println(err)
			load = 0
		}
		mem, err := strconv.ParseFloat(currentDevice.Sysstats.Memory, 64)
		if err != nil {
			log.Println("Error psrsing CPU load from ", currentDevice.Name)
			log.Println(err)
			mem = 0
		}
		var model = lookupModels(currentDevice.Model)
		var clients int
		if conf.Unifi.DisplayUsers {
			clients = currentDevice.Users
		}
		nodes = append(nodes, node{
			Firstseen:      "0",
			Lastseen:       time.Unix(int64(currentDevice.LastSeen), 0).Format(iso8601),
			IsOnline:       itob(currentDevice.State),
			IsGateway:      false,
			Clients:        clients,
			ClientsWifi24:  0,
			ClientsWifi5:   0,
			ClientsOther:   clients,
			RootFSUsage:    0,
			LoadAVG:        load / 100,
			MemoryUsage:    mem / 100,
			Uptime:         time.Now().Add(-1 * time.Second * time.Duration(currentDevice.Uptime)).Format(iso8601),
			GatewayNexthop: currentJSONDevice.GatewayNexthop,
			Gateway:        currentJSONDevice.Gateway,
			Location:       &currentJSONDevice.Location,
			NodeID:         strings.ReplaceAll(currentDevice.Mac, ":", ""),
			MAC:            currentDevice.Mac,
			Adresses:       []string{currentDevice.IP},
			Domain:         currentJSONDevice.Domain,
			Hostname:       "[Unifi] " + currentDevice.Name,
			Owner:          "Freifunk Rhein-Sieg",
			Firmware: firmware{
				Base:    "Ubiquiti - Stock",
				Release: currentDevice.Version,
			},
			Autoupdater: autoupdater{
				Enabled: false,
				Branch:  "stable",
			},
			NProc: 1,
			Model: model,
		})
	}
	return nodes, links, err
}

func UnifiNewAPI(user string, pass string, baseURL string) UnifiAPIData {
	return UnifiAPIData{
		user:    user,
		pass:    pass,
		baseURL: baseURL,
		client:  httpClient(),
	}
}

func (u *UnifiAPIData) ucCallAPI(url string, method string, body *bytes.Buffer, output interface{}) error {
	req, err := http.NewRequest(method, u.baseURL+url, body)
	if err != nil {
		return fmt.Errorf("can't set request %s", u.baseURL+url)
	}

	req.Header.Set("Content-Type", "application/json")
	response, err := u.client.Do(req)
	if err != nil {
		return fmt.Errorf("can't login %s", u.baseURL+url)
	}
	defer response.Body.Close()
	if response.StatusCode != 200 {
		return fmt.Errorf("login failed %s", u.baseURL+url)
	}

	data, err := io.ReadAll(response.Body)
	if err != nil {
		return err
	}

	err = json.Unmarshal(data, &output)
	if err != nil {
		return err
	}

	return nil
}

func (u *UnifiAPIData) ucLogin() error {
	var loginData = []byte(`{"username":"` + u.user + `","password":"` + u.pass + `"}`)

	url := "/api/login"
	err := u.ucCallAPI(url, http.MethodPost, bytes.NewBuffer(loginData), nil)
	if err != nil {
		return err
	}
	return nil
}

func (u *UnifiAPIData) ucGetSites() ([]ucSite, error) {
	var d struct {
		Data []ucSite `json:"data"`
	}

	url := "/api/self/sites"
	err := u.ucCallAPI(url, http.MethodGet, bytes.NewBuffer([]byte{}), &d)
	if err != nil {
		return []ucSite{}, err
	}
	return d.Data, nil
}

func (u *UnifiAPIData) ucGetDevices(sites []ucSite) ([]ucDevice, error) {
	var d struct {
		Data []ucDevice `json:"data"`
	}
	var s []ucDevice

	for _, site := range sites {
		url := "/api/s/" + site.ID + "/stat/device"
		u.ucCallAPI(url, http.MethodGet, bytes.NewBuffer([]byte{}), &d)
		s = append(s, d.Data...)
	}
	return s, nil
}

func UnifiAddLink(dev device, links []link) []link {
	for i := range links {
		if links[i].SourceAddr == dev.MAC {
			// link already exists
			return links
		}
	}
	if dev.LinkedTo == "" {
		//no LinkedTo in ucDevices.json
		return links
	}
	links = append(links, link{
		Type:       "cable",
		Source:     strings.ReplaceAll(dev.MAC, ":", ""),
		Target:     strings.ReplaceAll(dev.GatewayNexthop, ":", ""),
		SourceTQ:   1,
		TargetTQ:   1,
		SourceAddr: dev.MAC,
		TargetAddr: dev.LinkedTo,
	})
	return links
}

func findNodeID(NodeID string) bool {
	for i := range ucDev.Devices {
		if ucDev.Devices[i].GatewayNexthop == NodeID {
			return true
		}
	}
	return false
}