$fn=64;

// --- Parameters ---
shelf_width = 200;
shelf_depth = 100;
shelf_height = 25;
wall_thickness = 4;
clearance = 0.5;

// --- Derived Parameters ---
cavity_w = shelf_width - 2 * wall_thickness;
cavity_h = shelf_height - 2 * wall_thickness;
cavity_d = shelf_depth - wall_thickness;

bracket_w = cavity_w - 2 * clearance;
bracket_h = cavity_h - 2 * clearance;
bracket_d = cavity_d - clearance;

// --- Print Layout ---

// Shelf (Oriented with the cavity facing up for support-free printing)
translate([0, shelf_height, 0])
    rotate([90, 0, 0])
        shelf_body();

// Bracket (Oriented with the backplate flat on the bed)
translate([0, shelf_height + 30, 0])
    rotate([90, 0, 0])
        bracket();

// --- Modules ---

module shelf_body() {
    difference() {
        // Main outer shape
        hull() {
            // Front rounded corners
            translate([5, shelf_depth - 5, 0]) cylinder(r=5, h=shelf_height);
            translate([shelf_width - 5, shelf_depth - 5, 0]) cylinder(r=5, h=shelf_height);
            // Back flat edge
            cube([shelf_width, 1, shelf_height]);
        }

        // Inner cavity for the bracket
        // Cut starts exactly at the back (y=0) and goes deep into the shelf
        translate([wall_thickness, -0.1, wall_thickness])
            cube([cavity_w, cavity_d + 0.1, cavity_h]);
    }
}

module bracket() {
    difference() {
        union() {
            // Wall mounting plate
            cube([bracket_w, 8, bracket_h]);

            // Left support prong
            cube([15, bracket_d, bracket_h]);

            // Right support prong
            translate([bracket_w - 15, 0, 0])
                cube([15, bracket_d, bracket_h]);

            // Center support prong
            translate([bracket_w / 2 - 7.5, 0, 0])
                cube([15, bracket_d, bracket_h]);
        }

        // Counterbored screw holes for wall mounting
        for(x = [bracket_w / 4, 3 * bracket_w / 4]) {
            translate([x, -1, bracket_h / 2])
            rotate([-90, 0, 0]) {
                // Main screw hole
                cylinder(r=2.5, h=10);
                // Counterbore for screw head (recessed inside the bracket)
                translate([0, 0, 5]) cylinder(r=5, h=5);
            }
        }
    }
}