package netboxgo

import (
	"crypto/tls"
	"encoding/json"
	"io/ioutil"
	"net/http"
	"net/url"
	"time"

	"github.com/gorilla/schema"
	"github.com/pkg/errors"
)

type RearPortList struct {
	Count    int    `json:"count"`
	Next     string `json:"next"`
	Previous string `json:"previous"`
	Results  []struct {
		ID     int `json:"id"`
		Device struct {
			ID          int    `json:"id"`
			URL         string `json:"url"`
			Name        string `json:"name"`
			DisplayName string `json:"display_name"`
		} `json:"device"`
		Name string `json:"name"`
		Type struct {
			Label string `json:"label"`
			Value string `json:"value"`
		} `json:"type"`
		Positions   int    `json:"positions"`
		Description string `json:"description"`
		Cable       struct {
			ID    int    `json:"id"`
			URL   string `json:"url"`
			Label string `json:"label"`
		} `json:"cable"`
		Tags []string `json:"tags"`
	} `json:"results"`
}

// RearPortFilter is used to filter dcim_rearport_query to the Netbox API
type RearPortFilter struct {
	Offset int64 `schema:"offset,omitempty"`
	Limit  int64 `schema:"limit,omitempty"`

	// User specific filters
	ID          string `schema:"id,omitempty"`
	Name        string `schema:"name,omitempty"`
	Type        string `schema:"type,omitempty"`
	Positions   string `schema:"positions,omitempty"`
	Description string `schema:"description,omitempty"`
	Device      string `schema:"device,omitempty"`
}

// ListRearPorts method returns dcim_device_list from Netbox API
func (n *NetBox) ListRearPorts(d *RearPortList, f *RearPortFilter) error {
	encoder := schema.NewEncoder()

	transport := &http.Transport{
		TLSClientConfig: &tls.Config{InsecureSkipVerify: n.InsecureSkipVerify},
	}
	timeout := time.Duration(60 * time.Second)
	client := &http.Client{
		Timeout:   timeout,
		Transport: transport,
	}
	deviceurl := n.RootURL + "/api/dcim/rear-ports/"
	if f != nil {
		form := url.Values{}
		err := encoder.Encode(f, form)
		if err != nil {
			return err
		}
		query := form.Encode()
		deviceurl = deviceurl + "?" + query
	}
	var request *http.Request
	var err error
	request, err = http.NewRequest("GET", deviceurl, nil)
	if err != nil {
		return err
	}
	request.Header.Add("Accept", "application/json")
	request.Header.Add("Authorization", " Token "+n.Token)
	response, err := client.Do(request)
	if err != nil {
		return err
	}

	if response.StatusCode != http.StatusOK {
		return errors.Errorf("Error: response was: %d should be %d (%s)\n", response.StatusCode, http.StatusOK, deviceurl)
	}

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

	err = response.Body.Close()
	if err != nil {
		return err
	}

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