// ============================================================================
//  Kidsbox enclosure — helper modules
// ============================================================================

// A box with rounded VERTICAL edges only (flat top & bottom for clean FDM).
//  size = [x, y, z], r = corner radius.
module rbox(size, r) {
    x = size[0]; y = size[1]; z = size[2];
    hull() {
        for (sx = [r, x - r], sy = [r, y - r])
            translate([sx, sy, 0]) cylinder(h = z, r = r);
    }
}

// Hollow shell: outer rbox minus inner rbox, open at the top (+Z).
//  Floor thickness `ft`, wall `w`.
module shell(size, r, w, ft) {
    x = size[0]; y = size[1]; z = size[2];
    difference() {
        rbox([x, y, z], r);
        translate([w, w, ft])
            rbox([x - 2*w, y - 2*w, z - ft + 1], max(0.1, r - w));
    }
}

// A screw boss (solid post with a pilot hole) standing in +Z.
module boss(od, h, hole_d) {
    difference() {
        cylinder(h = h, d = od);
        translate([0, 0, -0.5]) cylinder(h = h + 1, d = hole_d);
    }
}

// A flat ring.
module ring(od, id, h) {
    difference() {
        cylinder(h = h, d = od);
        translate([0, 0, -0.5]) cylinder(h = h + 1, d = id);
    }
}

// Bolt circle: place children at `count` points on diameter `d`.
module bolt_circle(d, count, start = 0) {
    for (i = [0 : count - 1])
        rotate([0, 0, start + i * 360 / count])
            translate([d/2, 0, 0]) children();
}

// A rounded-rectangle plate (2D) for linear_extrude.
module rrect(x, y, r) {
    hull() for (sx = [r, x - r], sy = [r, y - r])
        translate([sx - x/2, sy - y/2]) circle(r = r);
}