$fn = 64;

// --- Parameters ---
stand_width = 80;        // Overall width of the stand
stand_height = 50;       // Total height of the backplate
shelf_depth = 18;        // Depth for the phone
lip_height = 12;         // Height of the front retaining lip
thickness = 4;           // Wall thickness

hsw_spacing = 40.88;     // Standard distance between HSW hex centers
plug_flat = 19.8;        // Flat-to-flat distance of the hex plug (slightly undersized for fit)
plug_depth = 8.0;        // Depth of the hex plug into the wall

eps = 0.01;              // Small overlap for manifold geometry

// Calculated positions
shelf_z = -35;           // Z position of the shelf's top surface
rib_height = stand_height + shelf_z - thickness; // Height of the support ribs

// --- Main Assembly ---
union() {
    // Backplate
    translate([-stand_width/2, 0, -stand_height])
        cube([stand_width, thickness, stand_height]);

    // Shelf
    translate([-stand_width/2, thickness - eps, shelf_z - thickness])
        cube([stand_width, shelf_depth + eps, thickness]);

    // Front Lip
    translate([-stand_width/2, thickness + shelf_depth - eps, shelf_z - thickness])
        cube([stand_width, thickness, lip_height + thickness]);

    // Support Ribs (Left and Right)
    translate([-stand_width/2 + 10, thickness - eps, shelf_z - thickness])
        rib();
    translate([stand_width/2 - 10 - thickness, thickness - eps, shelf_z - thickness])
        rib();

    // Left HSW Plug
    translate([-hsw_spacing/2, eps, -15])
        rotate([90, 0, 0])
        hsw_plug();

    // Right HSW Plug
    translate([hsw_spacing/2, eps, -15])
        rotate([90, 0, 0])
        hsw_plug();
}

// --- Modules ---

// Generates a standard Honeycomb Storage Wall (HSW) plug
module hsw_plug() {
    r1 = plug_flat / sqrt(3);
    r2 = (plug_flat - 0.5) / sqrt(3); // Slight taper for easier insertion
    
    // Rotate 30 degrees to align flats vertically per HSW standard
    rotate([0, 0, 30])
        cylinder(h=plug_depth + eps, r1=r1, r2=r2, $fn=6);
}

// Generates a triangular support gusset for the shelf
module rib() {
    hull() {
        // Top flat section under the shelf
        cube([thickness, shelf_depth + eps, eps]);
        // Back flat section against the backplate
        translate([0, 0, -rib_height])
            cube([thickness, eps, rib_height]);
    }
}