package main

import (
	"bytes"
	"encoding/json"
	"errors"
	"flag"
	"fmt"
	"io/ioutil"
	"log"
	"net"
	"net/url"
	"os"
	"sort"
	"strconv"
	"strings"

	"golang.org/x/text/encoding/unicode"

	"github.com/neilalexander/hjson-go"
	"github.com/yggdrasil-network/yggdrasil-go/src/defaults"
)

type admin_info map[string]interface{}

func main() {
	logbuffer := &bytes.Buffer{}
	logger := log.New(logbuffer, "", log.Flags())
	defer func() {
		if r := recover(); r != nil {
			logger.Println("Fatal error:", r)
			fmt.Print(logbuffer)
			panic(r)
			os.Exit(1)
		}
	}()

	endpoint := defaults.GetDefaults().DefaultAdminListen

	flag.Usage = func() {
		fmt.Fprintf(flag.CommandLine.Output(), "Usage: %s [options] command [key=value] [key=value] ...\n\n", os.Args[0])
		fmt.Println("Options:")
		flag.PrintDefaults()
		fmt.Println("\nPlease note that options must always specified BEFORE the command\non the command line or they will be ignored.\n")
		fmt.Println("Commands:\n  - Use \"list\" for a list of available commands\n")
		fmt.Println("Examples:")
		fmt.Println("  - ", os.Args[0], "list")
		fmt.Println("  - ", os.Args[0], "getPeers")
		fmt.Println("  - ", os.Args[0], "-v getSelf")
		fmt.Println("  - ", os.Args[0], "setTunTap name=auto mtu=1500 tap_mode=false")
		fmt.Println("  - ", os.Args[0], "-endpoint=tcp://localhost:9001 getDHT")
		fmt.Println("  - ", os.Args[0], "-endpoint=unix:///var/run/ygg.sock getDHT")
	}
	server := flag.String("endpoint", endpoint, "Admin socket endpoint")
	injson := flag.Bool("json", false, "Output in JSON format (as opposed to pretty-print)")
	verbose := flag.Bool("v", false, "Verbose output (includes public keys)")
	flag.Parse()
	args := flag.Args()

	if len(args) == 0 {
		flag.Usage()
		return
	}

	if *server == endpoint {
		if config, err := ioutil.ReadFile(defaults.GetDefaults().DefaultConfigFile); err == nil {
			if bytes.Compare(config[0:2], []byte{0xFF, 0xFE}) == 0 ||
				bytes.Compare(config[0:2], []byte{0xFE, 0xFF}) == 0 {
				utf := unicode.UTF16(unicode.BigEndian, unicode.UseBOM)
				decoder := utf.NewDecoder()
				config, err = decoder.Bytes(config)
				if err != nil {
					panic(err)
				}
			}
			var dat map[string]interface{}
			if err := hjson.Unmarshal(config, &dat); err != nil {
				panic(err)
			}
			if ep, ok := dat["AdminListen"].(string); ok && (ep != "none" && ep != "") {
				endpoint = ep
				logger.Println("Found platform default config file", defaults.GetDefaults().DefaultConfigFile)
				logger.Println("Using endpoint", endpoint, "from AdminListen")
			} else {
				logger.Println("Configuration file doesn't contain appropriate AdminListen option")
				logger.Println("Falling back to platform default", defaults.GetDefaults().DefaultAdminListen)
			}
		} else {
			logger.Println("Can't open config file from default location", defaults.GetDefaults().DefaultConfigFile)
			logger.Println("Falling back to platform default", defaults.GetDefaults().DefaultAdminListen)
		}
	} else {
		endpoint = *server
		logger.Println("Using endpoint", endpoint, "from command line")
	}

	var conn net.Conn
	u, err := url.Parse(endpoint)
	if err == nil {
		switch strings.ToLower(u.Scheme) {
		case "unix":
			logger.Println("Connecting to UNIX socket", endpoint[7:])
			conn, err = net.Dial("unix", endpoint[7:])
		case "tcp":
			logger.Println("Connecting to TCP socket", u.Host)
			conn, err = net.Dial("tcp", u.Host)
		default:
			logger.Println("Unknown protocol or malformed address - check your endpoint")
			err = errors.New("protocol not supported")
		}
	} else {
		logger.Println("Connecting to TCP socket", u.Host)
		conn, err = net.Dial("tcp", endpoint)
	}
	if err != nil {
		panic(err)
	}
	logger.Println("Connected")
	defer conn.Close()

	decoder := json.NewDecoder(conn)
	encoder := json.NewEncoder(conn)
	send := make(admin_info)
	recv := make(admin_info)

	for c, a := range args {
		if c == 0 {
			if strings.HasPrefix(a, "-") {
				logger.Printf("Ignoring flag %s as it should be specified before other parameters\n", a)
				continue
			}
			logger.Printf("Sending request: %v\n", a)
			send["request"] = a
			continue
		}
		tokens := strings.Split(a, "=")
		if len(tokens) == 1 {
			send[tokens[0]] = true
		} else if len(tokens) > 2 {
			send[tokens[0]] = strings.Join(tokens[1:], "=")
		} else if len(tokens) == 2 {
			if i, err := strconv.Atoi(tokens[1]); err == nil {
				logger.Printf("Sending parameter %s: %d\n", tokens[0], i)
				send[tokens[0]] = i
			} else {
				switch strings.ToLower(tokens[1]) {
				case "true":
					send[tokens[0]] = true
				case "false":
					send[tokens[0]] = false
				default:
					send[tokens[0]] = tokens[1]
				}
				logger.Printf("Sending parameter %s: %v\n", tokens[0], send[tokens[0]])
			}
		}
	}

	if err := encoder.Encode(&send); err != nil {
		panic(err)
	}
	logger.Printf("Request sent")
	if err := decoder.Decode(&recv); err == nil {
		logger.Printf("Response received")
		if recv["status"] == "error" {
			if err, ok := recv["error"]; ok {
				fmt.Println("Admin socket returned an error:", err)
			} else {
				fmt.Println("Admin socket returned an error but didn't specify any error text")
			}
			os.Exit(1)
		}
		if _, ok := recv["request"]; !ok {
			fmt.Println("Missing request in response (malformed response?)")
			os.Exit(1)
		}
		if _, ok := recv["response"]; !ok {
			fmt.Println("Missing response body (malformed response?)")
			os.Exit(1)
		}
		req := recv["request"].(map[string]interface{})
		res := recv["response"].(map[string]interface{})

		if *injson {
			if json, err := json.MarshalIndent(res, "", "  "); err == nil {
				fmt.Println(string(json))
			}
			os.Exit(0)
		}

		switch strings.ToLower(req["request"].(string)) {
		case "dot":
			fmt.Println(res["dot"])
		case "list", "getpeers", "getswitchpeers", "getdht", "getsessions", "dhtping":
			maxWidths := make(map[string]int)
			var keyOrder []string
			keysOrdered := false

			for _, tlv := range res {
				for slk, slv := range tlv.(map[string]interface{}) {
					if !keysOrdered {
						for k := range slv.(map[string]interface{}) {
							if !*verbose {
								if k == "box_pub_key" || k == "box_sig_key" {
									continue
								}
							}
							keyOrder = append(keyOrder, fmt.Sprint(k))
						}
						sort.Strings(keyOrder)
						keysOrdered = true
					}
					for k, v := range slv.(map[string]interface{}) {
						if len(fmt.Sprint(slk)) > maxWidths["key"] {
							maxWidths["key"] = len(fmt.Sprint(slk))
						}
						if len(fmt.Sprint(v)) > maxWidths[k] {
							maxWidths[k] = len(fmt.Sprint(v))
							if maxWidths[k] < len(k) {
								maxWidths[k] = len(k)
							}
						}
					}
				}

				if len(keyOrder) > 0 {
					fmt.Printf("%-"+fmt.Sprint(maxWidths["key"])+"s  ", "")
					for _, v := range keyOrder {
						fmt.Printf("%-"+fmt.Sprint(maxWidths[v])+"s  ", v)
					}
					fmt.Println()
				}

				for slk, slv := range tlv.(map[string]interface{}) {
					fmt.Printf("%-"+fmt.Sprint(maxWidths["key"])+"s  ", slk)
					for _, k := range keyOrder {
						preformatted := slv.(map[string]interface{})[k]
						var formatted string
						switch k {
						case "bytes_sent", "bytes_recvd":
							formatted = fmt.Sprintf("%d", uint(preformatted.(float64)))
						case "uptime", "last_seen":
							seconds := uint(preformatted.(float64)) % 60
							minutes := uint(preformatted.(float64)/60) % 60
							hours := uint(preformatted.(float64) / 60 / 60)
							formatted = fmt.Sprintf("%02d:%02d:%02d", hours, minutes, seconds)
						default:
							formatted = fmt.Sprint(preformatted)
						}
						fmt.Printf("%-"+fmt.Sprint(maxWidths[k])+"s  ", formatted)
					}
					fmt.Println()
				}
			}
		case "gettuntap", "settuntap":
			for k, v := range res {
				fmt.Println("Interface name:", k)
				if mtu, ok := v.(map[string]interface{})["mtu"].(float64); ok {
					fmt.Println("Interface MTU:", mtu)
				}
				if tap_mode, ok := v.(map[string]interface{})["tap_mode"].(bool); ok {
					fmt.Println("TAP mode:", tap_mode)
				}
			}
		case "getself":
			for k, v := range res["self"].(map[string]interface{}) {
				if buildname, ok := v.(map[string]interface{})["build_name"].(string); ok && buildname != "unknown" {
					fmt.Println("Build name:", buildname)
				}
				if buildversion, ok := v.(map[string]interface{})["build_version"].(string); ok && buildversion != "unknown" {
					fmt.Println("Build version:", buildversion)
				}
				fmt.Println("IPv6 address:", k)
				if subnet, ok := v.(map[string]interface{})["subnet"].(string); ok {
					fmt.Println("IPv6 subnet:", subnet)
				}
				if coords, ok := v.(map[string]interface{})["coords"].(string); ok {
					fmt.Println("Coords:", coords)
				}
				if *verbose {
					if boxPubKey, ok := v.(map[string]interface{})["box_pub_key"].(string); ok {
						fmt.Println("Public encryption key:", boxPubKey)
					}
					if boxSigKey, ok := v.(map[string]interface{})["box_sig_key"].(string); ok {
						fmt.Println("Public signing key:", boxSigKey)
					}
				}
			}
		case "getswitchqueues":
			maximumqueuesize := float64(4194304)
			portqueues := make(map[float64]float64)
			portqueuesize := make(map[float64]float64)
			portqueuepackets := make(map[float64]float64)
			v := res["switchqueues"].(map[string]interface{})
			if queuecount, ok := v["queues_count"].(float64); ok {
				fmt.Printf("Active queue count: %d queues\n", uint(queuecount))
			}
			if queuesize, ok := v["queues_size"].(float64); ok {
				fmt.Printf("Active queue size: %d bytes\n", uint(queuesize))
			}
			if highestqueuecount, ok := v["highest_queues_count"].(float64); ok {
				fmt.Printf("Highest queue count: %d queues\n", uint(highestqueuecount))
			}
			if highestqueuesize, ok := v["highest_queues_size"].(float64); ok {
				fmt.Printf("Highest queue size: %d bytes\n", uint(highestqueuesize))
			}
			if m, ok := v["maximum_queues_size"].(float64); ok {
				maximumqueuesize = m
				fmt.Printf("Maximum queue size: %d bytes\n", uint(maximumqueuesize))
			}
			if queues, ok := v["queues"].([]interface{}); ok {
				if len(queues) != 0 {
					fmt.Println("Active queues:")
					for _, v := range queues {
						queueport := v.(map[string]interface{})["queue_port"].(float64)
						queuesize := v.(map[string]interface{})["queue_size"].(float64)
						queuepackets := v.(map[string]interface{})["queue_packets"].(float64)
						queueid := v.(map[string]interface{})["queue_id"].(string)
						portqueues[queueport]++
						portqueuesize[queueport] += queuesize
						portqueuepackets[queueport] += queuepackets
						queuesizepercent := (100 / maximumqueuesize) * queuesize
						fmt.Printf("- Switch port %d, Stream ID: %v, size: %d bytes (%d%% full), %d packets\n",
							uint(queueport), []byte(queueid), uint(queuesize),
							uint(queuesizepercent), uint(queuepackets))
					}
				}
			}
			if len(portqueuesize) > 0 && len(portqueuepackets) > 0 {
				fmt.Println("Aggregated statistics by switchport:")
				for k, v := range portqueuesize {
					queuesizepercent := (100 / (portqueues[k] * maximumqueuesize)) * v
					fmt.Printf("- Switch port %d, size: %d bytes (%d%% full), %d packets\n",
						uint(k), uint(v), uint(queuesizepercent), uint(portqueuepackets[k]))
				}
			}
		case "addpeer", "removepeer", "addallowedencryptionpublickey", "removeallowedencryptionpublickey", "addsourcesubnet", "addroute", "removesourcesubnet", "removeroute":
			if _, ok := res["added"]; ok {
				for _, v := range res["added"].([]interface{}) {
					fmt.Println("Added:", fmt.Sprint(v))
				}
			}
			if _, ok := res["not_added"]; ok {
				for _, v := range res["not_added"].([]interface{}) {
					fmt.Println("Not added:", fmt.Sprint(v))
				}
			}
			if _, ok := res["removed"]; ok {
				for _, v := range res["removed"].([]interface{}) {
					fmt.Println("Removed:", fmt.Sprint(v))
				}
			}
			if _, ok := res["not_removed"]; ok {
				for _, v := range res["not_removed"].([]interface{}) {
					fmt.Println("Not removed:", fmt.Sprint(v))
				}
			}
		case "getallowedencryptionpublickeys":
			if _, ok := res["allowed_box_pubs"]; !ok {
				fmt.Println("All connections are allowed")
			} else if res["allowed_box_pubs"] == nil {
				fmt.Println("All connections are allowed")
			} else {
				fmt.Println("Connections are allowed only from the following public box keys:")
				for _, v := range res["allowed_box_pubs"].([]interface{}) {
					fmt.Println("-", v)
				}
			}
		case "getmulticastinterfaces":
			if _, ok := res["multicast_interfaces"]; !ok {
				fmt.Println("No multicast interfaces found")
			} else if res["multicast_interfaces"] == nil {
				fmt.Println("No multicast interfaces found")
			} else {
				fmt.Println("Multicast peer discovery is active on:")
				for _, v := range res["multicast_interfaces"].([]interface{}) {
					fmt.Println("-", v)
				}
			}
		case "getsourcesubnets":
			if _, ok := res["source_subnets"]; !ok {
				fmt.Println("No source subnets found")
			} else if res["source_subnets"] == nil {
				fmt.Println("No source subnets found")
			} else {
				fmt.Println("Source subnets:")
				for _, v := range res["source_subnets"].([]interface{}) {
					fmt.Println("-", v)
				}
			}
		case "getroutes":
			if _, ok := res["routes"]; !ok {
				fmt.Println("No routes found")
			} else if res["routes"] == nil {
				fmt.Println("No routes found")
			} else {
				fmt.Println("Routes:")
				for _, v := range res["routes"].([]interface{}) {
					fmt.Println("-", v)
				}
			}
		default:
			if json, err := json.MarshalIndent(recv["response"], "", "  "); err == nil {
				fmt.Println(string(json))
			}
		}
	} else {
		logger.Println("Error receiving response:", err)
	}

	if v, ok := recv["status"]; ok && v != "success" {
		os.Exit(1)
	}
	os.Exit(0)
}