mchess-server/server/chess_move.go

package server

import (
	"errors"
	"strings"
)

type chessMove struct {
	realMove    bool
	startSquare chessCoordinate
	endSquare   chessCoordinate
}

type chessCoordinate struct {
	col int
	row int
}

func parseMove(received string) (*chessMove, error) {
	var move chessMove

	splitReceived := strings.Split(received, " ")

	if len(splitReceived) != 3 {
		return nil, errors.New("invalid move command")
	}

	realMoveString := splitReceived[0]
	startSquareString := splitReceived[1]
	endSquareString := splitReceived[2]

	if strings.Compare(realMoveString, "mv") == 0 {
		move.realMove = true
	} else if strings.Compare(realMoveString, "pc") == 0 {
		move.realMove = false
	} else {
		return nil, errors.New("NEITHER MV OR PC RECEIVED AS FIRST BYTES")
	}

	move.startSquare.col = int(([]rune(startSquareString)[0] - '0'))
	move.startSquare.row = int(([]rune(startSquareString)[1] - '0'))

	move.endSquare.col = int(([]rune(endSquareString)[0] - '0'))
	move.endSquare.row = int(([]rune(endSquareString)[1] - '0'))

	return &move, nil
}