$fn = 64;

// --- Parameters ---
base_width = 80;
base_length = 80;
ground_thickness = 2;

foundation_width = 64;
foundation_length = 64;
foundation_height = 4;

floor_width = 58;
floor_length = 58;
floor_height = 2;

corner_radius = 2;

// Connection points for modular buildings
peg_hole_diameter = 3.2; // Clearance for 3mm pegs or magnets
peg_hole_depth = 3;
peg_inset = 6;

// --- Modules ---
module rounded_rect(w, l, h, r) {
    translate([-w/2, -l/2, 0])
    hull() {
        translate([r, r, 0]) cylinder(h=h, r=r);
        translate([w-r, r, 0]) cylinder(h=h, r=r);
        translate([r, l-r, 0]) cylinder(h=h, r=r);
        translate([w-r, l-r, 0]) cylinder(h=h, r=r);
    }
}

// --- Main Geometry ---
difference() {
    union() {
        // Ground layer (yard/sidewalk area)
        rounded_rect(base_width, base_length, ground_thickness, corner_radius);

        // Main foundation block
        translate([0, 0, ground_thickness])
            rounded_rect(foundation_width, foundation_length, foundation_height, corner_radius);

        // Raised inner floor (creates a stepped foundation look)
        translate([0, 0, ground_thickness + foundation_height])
            rounded_rect(floor_width, floor_length, floor_height, corner_radius);
    }

    // Magnet / Peg holes for building attachment
    for (x = [-1, 1]) {
        for (y = [-1, 1]) {
            translate([
                x * (floor_width/2 - peg_inset),
                y * (floor_length/2 - peg_inset),
                ground_thickness + foundation_height + floor_height - peg_hole_depth
            ])
            cylinder(h=peg_hole_depth + 1, d=peg_hole_diameter);
        }
    }
}