package netboxgo

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

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

type AddInventory struct {
	Device       int      `json:"device"`
	Parent       int      `json:"parent"`
	Name         string   `json:"name"`
	Manufacturer int      `json:"manufacturer"`
	PartID       string   `json:"part_id"`
	Serial       string   `json:"serial"`
	AssetTag     string   `json:"asset_tag"`
	Discovered   bool     `json:"discovered"`
	Description  string   `json:"description"`
	Tags         []string `json:"tags"`
}

type DcimInventoryItemsList 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"`
		Parent       int    `json:"parent"`
		Name         string `json:"name"`
		Manufacturer struct {
			ID              int    `json:"id"`
			URL             string `json:"url"`
			Name            string `json:"name"`
			Slug            string `json:"slug"`
			DevicetypeCount int    `json:"devicetype_count"`
		} `json:"manufacturer"`
		PartID      string   `json:"part_id"`
		Serial      string   `json:"serial"`
		AssetTag    string   `json:"asset_tag"`
		Discovered  bool     `json:"discovered"`
		Description string   `json:"description"`
		Tags        []string `json:"tags"`
	} `json:"results"`
}

type InventoryFilter struct {
	Device string `schema:"device"`
}

// ListDevices method returns dcim_device_list from Netbox API
func (n *NetBox) ListInventory(d *DcimInventoryItemsList, f *InventoryFilter) 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/inventory-items/"
	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
}

func (n *NetBox) AddInventory(v *AddInventory) error {
	data, err := json.Marshal(v)
	if err != nil {
		return err
	}
	transport := &http.Transport{
		TLSClientConfig: &tls.Config{InsecureSkipVerify: n.InsecureSkipVerify},
	}
	timeout := time.Duration(60 * time.Second)
	client := &http.Client{
		Timeout:   timeout,
		Transport: transport,
	}
	request, err := http.NewRequest("POST", n.RootURL+"/api/dcim/inventory-items/", bytes.NewBuffer(data))
	if err != nil {
		return err
	}
	request.Header.Add("Accept", "application/json")
	request.Header.Add("Content-Type", "application/json")
	request.Header.Add("Authorization", " Token "+n.Token)
	response, err := client.Do(request)
	if err != nil {
		return err
	}
	err = response.Body.Close()
	if err != nil {
		return err
	}

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