package controller

import (
	"context"
	"encoding/json"
	"errors"
	// "fmt"
	"net/http"
	"time"

	"github.com/gorilla/mux"
	"github.com/gravitl/netmaker/functions"
	"github.com/gravitl/netmaker/models"
	"github.com/gravitl/netmaker/mongoconn"
	"go.mongodb.org/mongo-driver/bson"
	"go.mongodb.org/mongo-driver/mongo/options"
	// "github.com/skip2/go-qrcode"
)

func externalHandlers(r *mux.Router) {

	r.HandleFunc("/api/externals", securityCheck(http.HandlerFunc(getAllExternals))).Methods("GET")
	r.HandleFunc("/api/externals/{network}", securityCheck(http.HandlerFunc(getNetworkExternals))).Methods("GET")
	r.HandleFunc("/api/externals/{network}/{clientid}", securityCheck(http.HandlerFunc(getExternal))).Methods("GET")
	r.HandleFunc("/api/externals/{network}/{clientid}/qr", securityCheck(http.HandlerFunc(getExternal))).Methods("GET")
	r.HandleFunc("/api/externals/{network}/{ingressgateway}", securityCheck(http.HandlerFunc(getExternal))).Methods("GET")
	r.HandleFunc("/api/externals/{network}/{clientid}", securityCheck(http.HandlerFunc(updateExternal))).Methods("PUT")
	r.HandleFunc("/api/externals/{network}/{clientid}", securityCheck(http.HandlerFunc(deleteExternal))).Methods("DELETE")
	r.HandleFunc("/api/externals/{network}", securityCheck(http.HandlerFunc(createExternal))).Methods("POST")
}

//Gets all nodes associated with network, including pending nodes
func getNetworkExternals(w http.ResponseWriter, r *http.Request) {

	w.Header().Set("Content-Type", "application/json")

	var nodes []models.External
	var params = mux.Vars(r)
	nodes, err := GetNetworkExternals(params["network"])
	if err != nil {
		returnErrorResponse(w, r, formatError(err, "internal"))
		return
	}

	//Returns all the nodes in JSON format
	w.WriteHeader(http.StatusOK)
	json.NewEncoder(w).Encode(nodes)
}

func GetNetworkExternals(network string) ([]models.External, error) {
	var nodes []models.External
	collection := mongoconn.Client.Database("netmaker").Collection("nodes")
	ctx, cancel := context.WithTimeout(context.Background(), 10*time.Second)
	filter := bson.M{"network": network}
	//Filtering out the ID field cuz Dillon doesn't like it. May want to filter out other fields in the future
	cur, err := collection.Find(ctx, filter, options.Find().SetProjection(bson.M{"_id": 0}))
	if err != nil {
		return []models.External{}, err
	}
	defer cancel()
	for cur.Next(context.TODO()) {
		//Using a different model for the ReturnExternal (other than regular node).
		//Either we should do this for ALL structs (so Networks and Keys)
		//OR we should just use the original struct
		//My preference is to make some new return structs
		//TODO: Think about this. Not an immediate concern. Just need to get some consistency eventually
		var node models.External
		err := cur.Decode(&node)
		if err != nil {
			return []models.External{}, err
		}
		// add item our array of nodes
		nodes = append(nodes, node)
	}
	//TODO: Another fatal error we should take care of.
	if err := cur.Err(); err != nil {
		return []models.External{}, err
	}
	return nodes, nil
}

//A separate function to get all nodes, not just nodes for a particular network.
//Not quite sure if this is necessary. Probably necessary based on front end but may want to review after iteration 1 if it's being used or not
func getAllExternals(w http.ResponseWriter, r *http.Request) {
	w.Header().Set("Content-Type", "application/json")
	nodes, err := functions.GetAllExternals()
	if err != nil {
		returnErrorResponse(w, r, formatError(err, "internal"))
		return
	}
	//Return all the nodes in JSON format
	w.WriteHeader(http.StatusOK)
	json.NewEncoder(w).Encode(nodes)
}

//Get an individual node. Nothin fancy here folks.
func getExternal(w http.ResponseWriter, r *http.Request) {
	// set header.
	w.Header().Set("Content-Type", "application/json")

	var params = mux.Vars(r)

	var node models.Node

	collection := mongoconn.Client.Database("netmaker").Collection("nodes")

	ctx, cancel := context.WithTimeout(context.Background(), 10*time.Second)

	filter := bson.M{"macaddress": params["macaddress"], "network": params["network"]}
	err := collection.FindOne(ctx, filter, options.FindOne().SetProjection(bson.M{"_id": 0})).Decode(&node)

	defer cancel()

	w.WriteHeader(http.StatusOK)
	json.NewEncoder(w).Encode(node)
}

//This one's a doozy
//To create a node
//Must have valid key and be unique
func createExternal(w http.ResponseWriter, r *http.Request) {
	w.Header().Set("Content-Type", "application/json")

	var params = mux.Vars(r)

	var errorResponse = models.ErrorResponse{
		Code: http.StatusInternalServerError, Message: "W1R3: It's not you it's me.",
	}

	networkName := params["network"]

	//Check if network exists  first
	//TODO: This is inefficient. Let's find a better way.
	//Just a few rows down we grab the network anyway
	networkexists, err := functions.NetworkExists(networkName)

	if err != nil {
		returnErrorResponse(w, r, formatError(err, "internal"))
		return
	} else if !networkexists {
		errorResponse = models.ErrorResponse{
			Code: http.StatusNotFound, Message: "W1R3: Network does not exist! ",
		}
		returnErrorResponse(w, r, errorResponse)
		return
	}

	var external models.External

	//get node from body of request
	err = json.NewDecoder(r.Body).Decode(&external)
	if err != nil {
		returnErrorResponse(w, r, formatError(err, "internal"))
		return
	}
	err = ValidateExternalCreate(external)
	if err != nil {
		returnErrorResponse(w, r, formatError(err, "badrequest"))
		return
	}

	node, err = CreateExternal(node, networkName)
	if err != nil {
		returnErrorResponse(w, r, formatError(err, "internal"))
		return
	}
	w.WriteHeader(http.StatusOK)
	json.NewEncoder(w).Encode(node)
}

func updateExternal(w http.ResponseWriter, r *http.Request) {
	w.Header().Set("Content-Type", "application/json")

	var params = mux.Vars(r)

	//Get id from parameters
	//id, _ := primitive.ObjectIDFromHex(params["id"])

	var node models.External

	//start here
	node, err := functions.GetExternalByMacAddress(params["network"], params["macaddress"])
	if err != nil {
		returnErrorResponse(w, r, formatError(err, "internal"))
		return
	}

	var nodechange models.ExternalUpdate

	// we decode our body request params
	_ = json.NewDecoder(r.Body).Decode(&nodechange)
	if nodechange.Network == "" {
		nodechange.Network = node.Network
	}
	if nodechange.MacAddress == "" {
		nodechange.MacAddress = node.MacAddress
	}
	err = ValidateExternalUpdate(params["network"], nodechange)
	if err != nil {
		returnErrorResponse(w, r, formatError(err, "badrequest"))
		return
	}

	node, err = UpdateExternal(nodechange, node)
	if err != nil {
		returnErrorResponse(w, r, formatError(err, "internal"))
		return
	}
	w.WriteHeader(http.StatusOK)
	json.NewEncoder(w).Encode(node)
}

//Delete a node
//Pretty straightforward
func deleteExternal(w http.ResponseWriter, r *http.Request) {
	// Set header
	w.Header().Set("Content-Type", "application/json")

	// get params
	var params = mux.Vars(r)

	success, err := DeleteExternal(params["macaddress"], params["network"])

	if err != nil {
		returnErrorResponse(w, r, formatError(err, "internal"))
		return
	} else if !success {
		err = errors.New("Could not delete node " + params["macaddress"])
		returnErrorResponse(w, r, formatError(err, "internal"))
		return
	}
	returnSuccessResponse(w, r, params["macaddress"]+" deleted.")
}