$fn=64;

// --- Parameters ---
// Overall width of the wall plate
plate_width = 80;       
// Overall height of the wall plate
plate_height = 50;      
// Base thickness of the wall plate
plate_thickness = 6;    

// Depth of the rear rail attachment lip
rail_lip_depth = 8;     
// Height of the rear rail attachment lip
rail_lip_height = 12;   
// Thickness of the downward catch for the rail
rail_catch_thickness = 4; 

// Distance between the two hooks
hook_spacing = 45;      
// Outward length of each hook
hook_length = 35;       
// Diameter of the hook shafts
hook_diam = 10;         
// Height of the upward lip at the end of each hook
hook_lip = 15;          

// --- Modules ---

// Generates the backplate with a generic rail attachment profile
module backplate() {
    translate([-plate_width/2, 0, 0])
    rotate([0, 90, 0])
    linear_extrude(plate_width)
    polygon([
        [0, 0], 
        [-plate_height, 0], 
        [-plate_height, -plate_thickness], 
        [-plate_height, -plate_thickness - rail_lip_depth], 
        [-plate_height + rail_lip_height, -plate_thickness - rail_lip_depth], 
        [-plate_height + rail_lip_height, -plate_thickness - rail_lip_depth + rail_catch_thickness], 
        [-plate_height + rail_lip_height + 5, -plate_thickness], 
        [-rail_lip_height, -plate_thickness], 
        [-rail_lip_height, -plate_thickness - rail_lip_depth], 
        [0, -plate_thickness - rail_lip_depth] 
    ]);
}

// Generates a single leash hook with a reinforced base
module single_hook() {
    // Reinforced base fillet
    hull() {
        rotate([-90, 0, 0]) 
            cylinder(h=0.2, d=hook_diam + 8);
        translate([0, hook_length * 0.3, 0]) 
            rotate([-90, 0, 0]) 
            cylinder(h=0.1, d=hook_diam);
    }

    // Main horizontal shaft
    rotate([-90, 0, 0]) 
        cylinder(h=hook_length, d=hook_diam);

    // Corner joint
    translate([0, hook_length, 0]) 
        sphere(d=hook_diam);

    // Upward vertical lip
    translate([0, hook_length, 0]) 
        cylinder(h=hook_lip, d=hook_diam);

    // Rounded tip
    translate([0, hook_length, hook_lip]) 
        sphere(d=hook_diam);
}

// --- Assembly ---
union() {
    backplate();
    
    // Left Hook (translated slightly into the plate to ensure manifold geometry)
    translate([-hook_spacing/2, -0.1, plate_height/2 - hook_diam/2]) 
        single_hook();
        
    // Right Hook
    translate([hook_spacing/2, -0.1, plate_height/2 - hook_diam/2]) 
        single_hook();
}