$fn=64;

// --- Parameters ---
// Total width of the stand
stand_width = 240; 
// Total depth of the stand
stand_depth = 130; 
// Height at the front edge
height_front = 50; 
// Height at the back edge (creates the ergonomic tilt)
height_back = 80; 
// Radius of the outer corners
corner_radius = 15; 
// Wall thickness for the hollow shell and bowl tubes
wall_thickness = 3; 
// Diameter of the cutouts for the bowls
bowl_diameter = 100; 

// Calculated angle for the top slope
tilt_angle = atan2(height_back - height_front, stand_depth);

// --- Modules ---
module rounded_rect(w, d, r) {
    hull() {
        translate([r, r]) circle(r);
        translate([w-r, r]) circle(r);
        translate([r, d-r]) circle(r);
        translate([w-r, d-r]) circle(r);
    }
}

module main_solid() {
    intersection() {
        // Base extrusion
        linear_extrude(height = height_back + 20)
            rounded_rect(stand_width, stand_depth, corner_radius);
        
        // Angled cutter for the top surface
        translate([0, 0, height_front])
            rotate([-tilt_angle, 0, 0])
            translate([-50, -50, 0])
            cube([stand_width + 100, stand_depth + 100, height_back + 50]);
    }
}

module inner_void() {
    difference() {
        // The hollow interior space
        intersection() {
            translate([0, 0, -1])
                linear_extrude(height = height_back + 20)
                translate([wall_thickness, wall_thickness])
                rounded_rect(
                    stand_width - 2*wall_thickness, 
                    stand_depth - 2*wall_thickness, 
                    max(1, corner_radius - wall_thickness)
                );
            
            // Angled cutter for the inner roof
            translate([0, 0, height_front - wall_thickness])
                rotate([-tilt_angle, 0, 0])
                translate([-50, -50, 0])
                cube([stand_width + 100, stand_depth + 100, height_back + 50]);
        }
        
        // Exclude the bowl tubes so they remain solid walls extending to the floor
        for(x = [stand_width/4, 3*stand_width/4]) {
            translate([x, stand_depth/2, height_front + (height_back-height_front)/2])
                rotate([-tilt_angle, 0, 0])
                translate([0, 0, -200])
                cylinder(d=bowl_diameter + 2*wall_thickness, h=400);
        }
    }
}

module bowl_holes() {
    // Cutouts for the bowls, perpendicular to the tilted surface
    for(x = [stand_width/4, 3*stand_width/4]) {
        translate([x, stand_depth/2, height_front + (height_back-height_front)/2])
            rotate([-tilt_angle, 0, 0])
            translate([0, 0, -200])
            cylinder(d=bowl_diameter, h=400);
    }
}

// --- Main Assembly ---
// Subtract the hollow interior and the bowl holes from the main solid block
difference() {
    main_solid();
    inner_void();
    bowl_holes();
}