// Copyright 2016 Martin Hebnes Pedersen (LA5NTA). All rights reserved.
// Use of this source code is governed by the MIT-license that can be
// found in the LICENSE file.

package main

import (
	"bytes"
	"context"
	"fmt"
	"log"
	"os"
	"runtime"
	"strings"
	"time"

	"github.com/la5nta/wl2k-go/transport/ax25"
	"github.com/peterh/liner"
)

func Interactive(ctx context.Context) {
	line := liner.NewLiner()
	defer line.Close()

	done := make(chan struct{})
	go func() {
		defer close(done)
		for {
			str, _ := line.Prompt(getPrompt())
			if str == "" {
				continue
			}
			line.AppendHistory(str)

			if str[0] == '#' {
				continue
			}

			if quit := execCmd(str); quit {
				break
			}
		}
	}()
	select {
	case <-ctx.Done():
	case <-done:
	}
}

func execCmd(line string) (quit bool) {
	cmd, param := parseCommand(line)
	switch cmd {
	case "connect":
		if param == "" {
			printInteractiveUsage()
			return
		}

		Connect(param)
	case "listen":
		Listen(param)
	case "unlisten":
		Unlisten(param)
	case "heard":
		PrintHeard()
	case "freq":
		freq(param)
	case "qtc":
		PrintQTC()
	case "debug":
		os.Setenv("ardop_debug", "1")
		fmt.Println("Number of goroutines:", runtime.NumGoroutine())
	case "q", "quit":
		return true
	case "":
		return
	default:
		printInteractiveUsage()
	}
	return
}

func printInteractiveUsage() {
	fmt.Println("Uri examples: 'LA3F@5350', 'LA1B-10 v LA5NTA-1', 'LA5NTA:secret@192.168.1.1:54321'")

	methods := []string{
		MethodArdop,
		MethodAX25, MethodAX25AGWPE, MethodAX25Linux, MethodAX25SerialTNC,
		MethodPactor,
		MethodTelnet,
		MethodVaraHF,
		MethodVaraFM,
	}
	fmt.Println("Methods:", strings.Join(methods, ", "))

	cmds := []string{
		"connect  METHOD:[URI] or alias  Connect to a remote station.",
		"listen   METHOD                 Listen for incoming connections.",
		"unlisten METHOD                 Unregister listener for incoming connections.",
		"freq     METHOD:FREQ            Change rig frequency.",
		"heard                           Display all stations heard over the air.",
		"qtc                             Print pending outbound messages.",
	}
	fmt.Println("Commands: ")
	for _, cmd := range cmds {
		fmt.Printf(" %s\n", cmd)
	}
}

func getPrompt() string {
	var buf bytes.Buffer

	status := getStatus()

	if len(status.ActiveListeners) > 0 {
		fmt.Fprintf(&buf, "L%v", status.ActiveListeners)
	}

	fmt.Fprint(&buf, "> ")
	return buf.String()
}

func PrintHeard() {
	pf := func(call string, t time.Time) {
		fmt.Printf("  %-10s (%s)\n", call, t.Format(time.RFC1123))
	}

	fmt.Println("ardop:")
	if adTNC == nil {
		fmt.Println("  (not initialized)")
	} else if heard := adTNC.Heard(); len(heard) == 0 {
		fmt.Println("  (none)")
	} else {
		for call, t := range heard {
			pf(call, t)
		}
	}

	fmt.Println("ax25+linux:")
	if heard, err := ax25.Heard(config.AX25Linux.Port); err != nil {
		fmt.Printf("  (%s)\n", err)
	} else if len(heard) == 0 {
		fmt.Println("  (none)")
	} else {
		for call, t := range heard {
			pf(call, t)
		}
	}
}

func PrintQTC() {
	msgs, err := mbox.Outbox()
	if err != nil {
		log.Println(err)
		return
	}
	fmt.Printf("QTC: %d.\n", len(msgs))
	for _, msg := range msgs {
		fmt.Printf(`%-12.12s (%s): %s`, msg.MID(), msg.Subject(), fmt.Sprint(msg.To()))
		if msg.Header.Get("X-P2POnly") == "true" {
			fmt.Printf(" (P2P only)")
		}
		fmt.Println("")
	}
}

func parseCommand(str string) (mode, param string) {
	parts := strings.SplitN(str, " ", 2)
	if len(parts) == 1 {
		return parts[0], ""
	}
	return parts[0], parts[1]
}