class Move {
    constructor(player, abalone) {
        this.id = -1;
        this.player = player;
        this.abalone = abalone;
        this.type = -1; // 1 marble / 2 column / 3 line
        this.done = false;
        this.repr = ""
        this.pieces = []
        this.direction = ""
    }

    add_piece(piece) {
        if (piece.player !== this.player) {
            // Piece is not owned by current player
            return false;
        }
        else if (this.pieces.length >= 3) {
            // Maximum pieces by move reached
            return false;
        }
        else if (this.pieces.indexOf(piece) != -1) {
            // Piece is already selected
            return false;
        }
        else if (this.pieces.length == 0) {
            // Move set is empty
            this.pieces.push(piece);
            return true;
        }
        else if (
            Slot.are_aligned(this.pieces.concat([piece]))) {
            this.pieces.push(piece);
            return true;
        }
        return false;
    }

    del_piece(piece) {
        let i = this.pieces.indexOf(piece);
        if (i == -1) {
            return false;
        }
        this.pieces.splice(i, 1);
        return true;
    }

    set_direction(dir) {
        if (['nw','ne','e','se','sw','w'].indexOf(dir) == -1) {
            return false;
        }
        this.direction = dir;
        return true;
    }

    set_type() {
        this.sort_pieces();
        if (this.pieces.length < 1) {
            this.type = -1;
            return;
        }
        else if (this.pieces.length == 1) {
            this.type = 1;
            return;
        }
        let coord = this.pieces[1].get_direction_coord(this.direction);
        if (coord == false) {
            this.type = -1;
            return;
        }
        else if (coord.x == this.pieces[0].coord.x &&
            coord.y == this.pieces[0].coord.y) {
            this.type = 2;
            return;
        }
        else {
            this.type = 3;
            return;
        }
    }

    is_possible() {
        this.set_type();
        if (this.type == -1) {
            alert('Select at least one piece');
            return false;
        }
        else if (this.pieces.length > 3) {
            alert('Too much marbles are selected');
        }

        for (let piece of this.pieces) {
            let coord = piece.get_direction_coord(this.direction);
            if (typeof(coord) == 'undefined') {
                return false;
            }
            let next_slot = this.abalone.board.get_coord(coord);
            if (typeof(next_slot) != 'undefined' && next_slot.length > 1) {
            // A piece is located in the next slot
                if (this.pieces.indexOf(next_slot[1])) {
                // The next slot is already in the move
                    continue;
                }
                else if (next_slot[1].player == this.player &&
                    piece == this.pieces[0]) {
                // There is another piece of the current player
                // It means that we can't move
                    return false;
                }
                else {
                // This is a sumito case
                    if (this.sumito()) {
                        this.sort_pieces();
                        return this.move_pieces();
                    }
                }
            }
            else {
            // The slot is free, so we move all the pieces in this direction
                return this.move_pieces();
            }
        }

    }

    move_pieces() {
        for (let piece of this.pieces) {
            this.abalone.board.pop_coord(piece.coord);
            let slot = this.abalone.board.get_slot(piece.coord);
            let new_coord = piece.get_direction_coord(this.direction);
            if (this.abalone.board.get_slot(new_coord) != false) {
                piece.new_coord = new_coord;
            }
            else {
                piece.new_coord = false;
                piece.out = true;
            }
        }

        for (let piece of this.pieces) {
            if (piece.out == true || piece.new_coord == false) {
                this.abalone.add_point(piece);
                piece.set_out(); 
                continue;
            }
            let next_slot = this.abalone.board.get_slot(piece.new_coord);
            if (next_slot == false || typeof(next_slot) == 'undefined') {
                break;
            }

            this.abalone.board.push_coord(piece.new_coord, piece);
            piece.coord = piece.new_coord;
            piece.move(next_slot.element.position(),
                next_slot.element.rotation(),
                next_slot.element.offsetX());
            if (piece.selected) {
                piece.set_selected();
            }
        }

        this.abalone.layers.pieces.draw();
        return true;
    }

    sumito() {
        if (this.type != 2) {
            return false;
        }
        
        let new_coord = this.pieces[0].get_direction_coord(this.direction);

        let next_slot = this.abalone.board.get_coord(new_coord);
        if (next_slot.length <= 1) {
        // Free slot! - should not happen in this function
            return true;
        }
        let enemy_piece = next_slot[1];
        new_coord = enemy_piece.get_direction_coord(this.direction);
        next_slot = this.abalone.board.get_coord(new_coord);
        if (next_slot == false || next_slot.length <= 1) {
        // It's outside! || it's free
            this.pieces.unshift(enemy_piece);
            return true;
        }
        else if (this.pieces.length <= 2) {
        // We don't have enough pieces to face 2 enemy marbles
            return false;
        }
        else {
            this.pieces.unshift(enemy_piece);
        }
        enemy_piece = next_slot[1];
        new_coord = enemy_piece.get_direction_coord(this.direction);
        next_slot = this.abalone.board.get_coord(new_coord);
        if (next_slot == false || next_slot.length <= 1) {
            this.pieces.unshift(enemy_piece);
            return true;
        }
        return false;
    }

    sort_pieces() {
        let sort_function = false;
        switch (this.direction[0]) {
            case 'e':
                sort_function = function (a, b) {
                    return parseInt(b.coord.y) - parseInt(a.coord.y);
                }
                break;
            case 'w':
                sort_function = function (a, b) {
                    return parseInt(a.coord.y) - parseInt(b.coord.y);
                }
                break;
            case 'n':
                sort_function = function (a, b) {
                    return a.coord.x.charCodeAt() - b.coord.x.charCodeAt();
                }
                break;
            case 's':
                sort_function = function (a, b) {
                    return b.coord.x.charCodeAt() - a.coord.x.charCodeAt();
                }
                break;
        }
        this.pieces.sort(sort_function);
    }
}