$fn=64;

// --- Parameters ---
hook_width = 15;        // Width of the hook (extrusion depth)
base_height = 60;       // Height of the wall plate
base_thick = 5;         // Thickness of the wall plate
hook_length = 45;       // Total extension from the wall
hook_thick = 8;         // Thickness of the hook arm
lip_height = 12;        // Height of the front retaining lip
hole_dia = 4.5;         // Screw hole diameter (clearance for #8 or #10 screw)
hole_spacing = 40;      // Distance between screw holes
cs_depth = 3;           // Countersink depth

module hook_profile() {
    // Wall plate with a flat back and rounded front edges
    r = base_thick / 2;
    translate([-base_thick, -base_height/2])
        square([r, base_height]);
    hull() {
        translate([-r, -base_height/2 + r]) circle(r=r);
        translate([-r, base_height/2 - r]) circle(r=r);
    }

    // Contoured hook arm (saddle shape for wrench handle)
    hull() {
        // Shifted slightly left (-0.1) to ensure manifold overlap with the base plate
        translate([hook_thick/2 - 0.1, 0])
            circle(d=hook_thick);
        translate([hook_length * 0.4, -hook_thick * 0.8])
            circle(d=hook_thick);
    }

    // Upturned retaining lip
    hull() {
        translate([hook_length * 0.4, -hook_thick * 0.8])
            circle(d=hook_thick);
        translate([hook_length - hook_thick/2, lip_height])
            circle(d=hook_thick);
    }
}

// Positioned to lay flat on the print bed for optimal strength and support-free printing
translate([0, 0, hook_width/2])
difference() {
    // Extrude the 2D profile into 3D
    linear_extrude(height=hook_width, center=true)
        hook_profile();

    // Mounting holes
    for (y = [-hole_spacing/2, hole_spacing/2]) {
        translate([-base_thick - 1, y, 0])
            rotate([0, 90, 0]) {
                // Main clearance hole
                cylinder(d=hole_dia, h=base_thick + 2);
                
                // 45-degree countersink (prints cleanly in horizontal orientation)
                translate([0, 0, base_thick + 1 - cs_depth])
                    cylinder(d1=hole_dia, d2=hole_dia + 2*cs_depth, h=cs_depth + 0.1);
            }
    }
}