$fn=64;

// --- Parameters ---
bin_width = 100;
bin_depth = 70;
bin_height = 80;
wall_thickness = 2.5;
corner_radius = 5;

// Rail hook parameters (designed for standard wall rails/cleats)
hook_width = 60;
hook_height = 20;
hook_depth = 12;
hook_thickness = 4;

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

// --- Main Geometry ---
union() {
    // Main Storage Bin
    difference() {
        // Outer shell
        rounded_box(bin_width, bin_depth, bin_height, corner_radius);
        
        // Inner cavity (shifted up and thinner to leave walls and floor)
        translate([wall_thickness, wall_thickness, wall_thickness])
            rounded_box(
                bin_width - 2*wall_thickness, 
                bin_depth - 2*wall_thickness, 
                bin_height, // Extra height ensures clean cut at the top
                max(0.1, corner_radius - wall_thickness)
            );
    }

    // Rail Hook (Back side, top aligned)
    // Note: May require supports when 3D printing depending on orientation
    translate([(bin_width - hook_width)/2, bin_depth - 0.1, bin_height - hook_height]) {
        rotate([90, 0, 90]) {
            linear_extrude(hook_width) {
                polygon([
                    [-0.1, hook_height],
                    [hook_depth, hook_height],
                    [hook_depth, 0],
                    [hook_depth - hook_thickness, 0],
                    [hook_depth - hook_thickness, hook_height - hook_thickness],
                    [-0.1, hook_height - hook_thickness]
                ]);
            }
        }
    }
    
    // Lower standoff to keep bin perfectly vertical against the wall
    translate([(bin_width - hook_width)/2, bin_depth - 0.1, 10]) {
        cube([hook_width, hook_depth - hook_thickness + 0.1, hook_thickness]);
    }
}