// holds the state of your board and calculates the view layer
class Board extends PureComponent {
    constructor( props ) {
        super( props );

        // create pieces for however you want the game to start
        this.pieces = {
            p1: new piece( "Lumberjack" ),
            p2: new piece( "Lumberjack" ),
            p3: new piece( "Lumberjack" ),
            p4: new piece( "Tree" ),
            p5: new piece( "Tree" ),
            p6: new piece( "Tree" )
        }

        // flatten for easy and speed of access
        const { p1, p2, p3, p4, p5, p6 } = this.pieces;

        // initial state, this is what gets updated by this.setState method
        // to update the rendered view
        this.state ={
            squares: [
                [ p1, p2, p3 ],
                [ null, null, null ],
                [ p4, p5, p6 ]
            ]
        };
    }

    // render method that produces the view
    render() {
        const { squares } = this.state;
        const iLength = squares.length;
        let i, j jLength, components = [ ];

        // generate the Squares from this.state data
        for ( i = 0; i < iLength; i++ ) {
            jLength = squares[ i ].length;
            for ( j = 0; jLength; j++ ) {
                components.push( <Square piece={ squares[ i ][ j ] } /> );
            }
        }

        // render the Squares containing the pieces
        return (
            <div className="board">
                { components }
            </div>
        );
    }
}

// piece constructor
function piece( name ) {
    this.name = name;
}