//
//  dolmetschctl
//
//
//  Copyright (C) 2019 Christian Pointner <equinox@spreadspace.org>
//
//  This file is part of dolmetschctl.
//
//  dolmetschctl is free software: you can redistribute it and/or modify
//  it under the terms of the GNU General Public License as published by
//  the Free Software Foundation, either version 3 of the License, or
//  any later version.
//
//  dolmetschctl is distributed in the hope that it will be useful,
//  but WITHOUT ANY WARRANTY; without even the implied warranty of
//  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
//  GNU General Public License for more details.
//
//  You should have received a copy of the GNU General Public License
//  along with dolmetschctl. If not, see <http://www.gnu.org/licenses/>.
//

package main

import (
	"strconv"

	"github.com/spreadspace/telgo"
)

type TelnetInterface struct {
	server *telgo.Server
}

func telnetCmdLang(c *telgo.Client, args []string, sm *StateMachine) bool {
	if len(args) > 2 {
		c.Sayln("usage: lang <language>")
		return false
	}
	if len(args) == 1 {
		c.Sayln("current language: %s", sm.GetLanguage())
		return false
	}

	lang := args[1]
	if lang == "none" {
		lang = ""
	}
	if err := sm.SetLanguage(Language(lang)); err != nil {
		c.Sayln("selecting language failed: %v", err)
	}
	return false
}

func telnetCmdRatio(c *telgo.Client, args []string, sm *StateMachine) bool {
	if len(args) > 2 {
		c.Sayln("usage: ratio <ratio>")
		return false
	}
	if len(args) == 1 {
		c.Sayln("current ratio: %1.3f", sm.GetOriginal2InterpreterRatio())
		return false
	}

	r, err := strconv.ParseFloat(args[1], 32)
	if err != nil {
		c.Sayln("invalid ratio: %v", err)
		return false
	}

	if err := sm.SetOriginal2InterpreterRatio(float32(r)); err != nil {
		c.Sayln("setting ratio failed: %v", err)
	}
	return false
}

func telnetCmdState(c *telgo.Client, args []string, sm *StateMachine) bool {
	if len(args) != 1 {
		c.Sayln("usage: state")
		return false
	}
	c.Sayln("current state: %s", sm.GetState())
	return false
}

func telnetQuit(c *telgo.Client, args []string) bool {
	return true
}

func (telnet *TelnetInterface) Run() error {
	return telnet.server.Run()
}

func NewTelnetInterface(addr string, sm *StateMachine) (telnet *TelnetInterface, err error) {
	telnet = &TelnetInterface{}

	cmdlist := make(telgo.CmdList)
	cmdlist["lang"] = func(c *telgo.Client, args []string) bool { return telnetCmdLang(c, args, sm) }
	cmdlist["ratio"] = func(c *telgo.Client, args []string) bool { return telnetCmdRatio(c, args, sm) }
	cmdlist["state"] = func(c *telgo.Client, args []string) bool { return telnetCmdState(c, args, sm) }
	cmdlist["quit"] = telnetQuit

	telnet.server, err = telgo.NewServer(addr, "dolmetschctl> ", cmdlist, nil)

	return
}