// Copyright (c) 2014-2017 The btcsuite developers
// Use of this source code is governed by an ISC
// license that can be found in the LICENSE file.

package main

import (
	"io/ioutil"
	"log"
	"path/filepath"
	"time"

	"github.com/kaspanet/kaspad/domainmessage"
	"github.com/kaspanet/kaspad/rpc/client"
	"github.com/kaspanet/kaspad/util"
)

func main() {
	// Only override the handlers for notifications you care about.
	// Also note most of these handlers will only be called if you register
	// for notifications. See the documentation of the rpcclient
	// NotificationHandlers type for more details about each handler.
	ntfnHandlers := client.NotificationHandlers{
		OnFilteredBlockAdded: func(blueScore uint64, header *domainmessage.BlockHeader, txns []*util.Tx) {
			log.Printf("Block added: %s (%d) %s",
				header.BlockHash(), blueScore, header.Timestamp)
		},
	}

	// Connect to local kaspad RPC server using websockets.
	kaspadHomeDir := util.AppDataDir("kaspad", false)
	certs, err := ioutil.ReadFile(filepath.Join(kaspadHomeDir, "rpc.cert"))
	if err != nil {
		log.Fatal(err)
	}
	connCfg := &client.ConnConfig{
		Host:         "localhost:16110",
		Endpoint:     "ws",
		User:         "yourrpcuser",
		Pass:         "yourrpcpass",
		Certificates: certs,
	}
	client, err := client.New(connCfg, &ntfnHandlers)
	if err != nil {
		log.Fatal(err)
	}

	// Register for block added notifications.
	if err := client.NotifyBlocks(); err != nil {
		log.Fatal(err)
	}
	log.Println("NotifyBlocks: Registration Complete")

	// Get the current block count.
	blockCount, err := client.GetBlockCount()
	if err != nil {
		log.Fatal(err)
	}
	log.Printf("Block count: %d", blockCount)

	// For this example gracefully shutdown the client after 10 seconds.
	// Ordinarily when to shutdown the client is highly application
	// specific.
	log.Println("Client shutdown in 10 seconds...")
	time.AfterFunc(time.Second*10, func() {
		log.Println("Client shutting down...")
		client.Shutdown()
		log.Println("Client shutdown complete.")
	})

	// Wait until the client either shuts down gracefully (or the user
	// terminates the process with Ctrl+C).
	client.WaitForShutdown()
}