package furcadia

import (
	"fmt"
	"log"
	"net"
)

///////////////////////////////////////////////////////////////////////////////////////////////////
// TYPE: FurcadiaClient ///////////////////////////////////////////////////////////////////////////
///////////////////////////////////////////////////////////////////////////////////////////////////

type FurcadiaClient struct {
	// Furcadia character to authenticate as
	Character *Character

	// Network connection object
	_Conn net.Conn
}

func NewFurcadiaClient(c Character) *FurcadiaClient {
	return &FurcadiaClient{
		Character: &c,
		_Conn:     nil,
	}
}

// IsConnected returns true if this furcadia client instance had Connect()
// called on it at least once.
func (fc *FurcadiaClient) IsConnected() bool {
	return fc._Conn != nil
}

// Connect establishes a connection to the Furcadia game server
// (for the first time).
//
// Note: this method CANNOT be called twice on the same client instance!
func (fc *FurcadiaClient) Connect(address string) error {
	if fc.IsConnected() {
		return ErrAlreadyConnected
	}

	c, err := net.Dial("tcp", address)
	if err != nil {
		log.Printf("[%v] Cannot connect to %v: %v", fc.String(), address, err)
		return err
	}

	log.Printf("[%v] Connected to %v...", fc.String(), address)
	fc._Conn = c
	return nil
}

// Disconnect closes an existing connection to the Furcadia game server.
// Calling this method allows future calls to Connect() again. If this instance
// was not connected at the time, nothing will happen and nil is returned.
//
// If closing the underlying network connection produces an error, it will be
// returned back to the caller. In either case, the connection will be closed
// and no longer owned by this instance.
func (fc *FurcadiaClient) Disconnect() error {
	if !fc.IsConnected() {
		return nil
	}

	err := fc._Conn.Close()
	fc._Conn = nil
	return err
}

// String returns a string representation of a FurcadiaClient instance for
// printing/logging purposes
func (fc *FurcadiaClient) String() string {
	return fmt.Sprintf("FurcadiaClient<%s>", fc.Character.DisplayName)
}