$fn = 64;

// --- Parameters ---
shelf_width = 200;
shelf_depth = 150;
shelf_thickness = 25;

bracket_width = 140;
bracket_depth = 12;
bracket_height = 15;

prong_length = 85;
prong_diameter = 12;
prong_spacing = 90;

clearance = 0.4; // Tolerance for slip fit

screw_diameter = 4.5;
screw_head_diameter = 9.0;
screw_head_depth = 4.0;

// --- Shelf Body ---
module floating_shelf() {
    difference() {
        // Main body with rounded front corners
        hull() {
            translate([-shelf_width/2, 0, 0]) 
                cube([shelf_width, 1, shelf_thickness]);
            translate([-shelf_width/2 + 5, shelf_depth - 5, 0]) 
                cylinder(r=5, h=shelf_thickness);
            translate([shelf_width/2 - 5, shelf_depth - 5, 0]) 
                cylinder(r=5, h=shelf_thickness);
        }
        
        // Cutout for the wall bracket base plate
        translate([-bracket_width/2 - clearance, -0.1, shelf_thickness/2 - bracket_height/2 - clearance])
            cube([bracket_width + clearance*2, bracket_depth + 0.1, bracket_height + clearance*2]);
            
        // Cutouts for the prongs
        for (x = [-prong_spacing/2, prong_spacing/2]) {
            translate([x, bracket_depth - 0.1, shelf_thickness/2])
                rotate([-90, 0, 0])
                cylinder(h=prong_length + clearance + 0.1, d=prong_diameter + clearance*2);
        }
    }
}

// --- Wall Bracket ---
module wall_bracket() {
    difference() {
        union() {
            // Bracket base plate
            translate([-bracket_width/2, 0, shelf_thickness/2 - bracket_height/2]) 
                cube([bracket_width, bracket_depth, bracket_height]);
                
            // Prongs with chamfered tips for easy insertion
            for (x = [-prong_spacing/2, prong_spacing/2]) {
                translate([x, bracket_depth, shelf_thickness/2])
                    rotate([-90, 0, 0]) {
                        cylinder(h=prong_length - 2, d=prong_diameter);
                        translate([0, 0, prong_length - 2])
                            cylinder(h=2, d1=prong_diameter, d2=prong_diameter - 2);
                    }
            }
        }
        
        // Mounting screw holes
        for (x = [-bracket_width/2 + 15, 0, bracket_width/2 - 15]) {
            translate([x, -0.1, shelf_thickness/2])
                rotate([-90, 0, 0]) {
                    // Screw shaft
                    cylinder(h=bracket_depth + 0.2, d=screw_diameter);
                    // Screw head countersink
                    translate([0, 0, bracket_depth - screw_head_depth + 0.1])
                        cylinder(h=screw_head_depth + 0.2, d1=screw_diameter, d2=screw_head_diameter);
                }
        }
    }
}

// --- Print Layout ---
// Positioned flat on the build plate, separated for easy printing
floating_shelf();

translate([0, -120, 0]) 
    wall_bracket();