package board

import (
	"fmt"
	"strings"
)

// MoveProp is defined as
// <piece><disambiguity><captures><square><promote><check|mate>
type MoveProp uint16

// Available MoveProps
const (
	QueenSideCastle MoveProp = 1 << iota
	KingSideCastle
	Capture
	EnPassant
	Check
	Mate
	inCheck
)

// Move is defined as
type Move struct {
	Piece     PieceType
	FromRank  *Rank
	FromFile  *File
	To        Square
	PromoteTo PieceType
	Props     MoveProp
}

func (m Move) String() string {
	out := ""
	if m.HasProp(KingSideCastle) {
		out += "O-O"
	} else if m.HasProp(QueenSideCastle) {
		out += "O-O-O"
	} else {
		if m.Piece != NoPieceType && m.Piece != Pawn {
			out += strings.ToUpper(m.Piece.String())
		}
		if m.FromFile != nil {
			out += m.FromFile.String()
		}
		if m.FromRank != nil {
			out += m.FromRank.String()
		}
		if m.HasProp(Capture) {
			out += "x"
		}
		out += m.To.String()
		if m.PromoteTo != NoPieceType {
			out += fmt.Sprintf("=%s", m.PromoteTo.String())
		}
	}
	if m.HasProp(Check) {
		out += "+"
	} else if m.HasProp(Mate) {
		out += "#"
	}
	return out
}

// AddProp adds the given MoveProp to this move.
func (m *Move) AddProp(prop MoveProp) {
	m.Props = m.Props | prop
}

// HasProp returns true if this move has the given MoveProp.
func (m Move) HasProp(prop MoveProp) bool {
	return m.Props&prop > 0
}