let baseLen = 38; // nominal X/Y spacing
let clearance = 1; // clearance from nominal for play
let partClearance = 5; // clearance for separate parts
let units = 8; // number of units across board
let bezelInset = 3;
let boardWidth = units * baseLen + 2 * bezelInset;

let bezelWidth = 12;
let bezelHeight = 17;
let bezelLength = boardWidth + 2 * bezelWidth - 2 * bezelInset;
let bezelInsetOffset = 2;

let boardHeight = 3;
let pegHeight = 6;
let pegOffset = pegHeight / 2 + boardHeight;
let pegWidth = baseLen / 2.414; // side length of peg, without clearance

let pawnHeight = pegHeight + 6;
let pawnsPerSide = 14;

let assembled = Checkbox("Assembled", false);
let darkPieces = Checkbox("Dark pieces", false);

function pawn() {
    let pawnLeg = baseLen - clearance;
    let basePawn = Box(pawnLeg, pawnLeg, pawnHeight, true);
    return Intersection([
        basePawn,
        Rotate([0, 0, 1], 45, basePawn)
    ]);
}

function peg() {
    let pegLeg = pegWidth - clearance;
    return Rotate([0, 0, 1], 45, Box(pegLeg, pegLeg, pegHeight+0.2, true));
}

function baseBoard() {
    let board = [Translate([0, 0, boardHeight / 2], Box(boardWidth, boardWidth, boardHeight, true))];
    for (let x = 1; x < units; x++) {
        let xOffset = (x - units / 2) * baseLen;
        for (let y = 1; y < units; y++) {
            let yOffset = (y - units / 2) * baseLen;
            board.push(Translate([xOffset, yOffset, pegOffset-0.1],  peg()));
        }
    }
    return Union(board);
}

function bezel() {
    return Translate([0, 0, bezelWidth / 2],
        FilletEdges(
            Difference(
                ChamferEdges(Box(bezelLength, bezelHeight, bezelWidth, true), bezelWidth - 0.01, [1, 5]),
                [Translate([0, -(bezelHeight/2-boardHeight/2), bezelWidth / 2 - bezelInset / 2], Box(bezelLength, boardHeight+2*clearance, bezelInset+2*clearance, true))]
            ),
            1.5, [7, 17, 13]
        )
    );
}

function bezelSet() {
    return Rotate([0, 0, 1], 90, Union([
        Translate([0, -(bezelHeight / 2 + partClearance/2), 0], bezel()),
        Translate([0, bezelHeight / 2 + partClearance/2, 0], bezel())
    ]));
}

function pawnSet() {
    let pawns = [];
    for (let y = 0; y < pawnsPerSide/2; y++) {
        pawns.push(Translate([0, boardWidth/2 - baseLen/2 - y * (baseLen + partClearance), 0], pawn()));
        pawns.push(Translate([baseLen + partClearance, boardWidth/2 - baseLen/2 -y * (baseLen + partClearance), 0], pawn()));
    }
    return Union(pawns);
}

if (assembled) {
    Translate([0, 0, bezelInsetOffset], baseBoard());
    let b = Translate([0, boardWidth/2 + bezelWidth - bezelInset, bezelHeight/2], Rotate([1, 0, 0], 90, bezel()));
    for (let n=0; n < 4; n++) {
        b = Rotate([0, 0, 1], 90, b, true);
    }
    for (let x=0; x < units; x++) {
        for (let y=0; y < units; y++) {
            // show that every position could be filled with one of the 28 actual pawns
            Translate([-baseLen*units/2 + baseLen/2 + baseLen*x, -baseLen*units/2 + baseLen/2 + baseLen*y, bezelInsetOffset+boardHeight+pawnHeight/2], pawn());
        }
    }
} else if (darkPieces) {
    Translate([baseLen/2 + partClearance, 0, 0], pawnSet());
    Translate([-(bezelWidth + partClearance), 0, 0], bezelSet());
} else {
    baseBoard();
    Translate([boardWidth/2 + baseLen/2 + partClearance, 0, pawnHeight/2], pawnSet());
    Translate([-(boardWidth/2 + bezelWidth + partClearance*3), 0, 0], bezelSet());
}