$fn = 64;

// --- Parameters ---
length = 200;           // Total length of the cleat strip
height = 35;            // Total height of the cleat
thickness = 15;         // Total thickness (depth from wall)
top_flat = 5;           // Thickness of the flat top edge (prevents sharp fragile tip)
bevel_height = 10;      // Height of the 45-degree interlocking bevel

num_holes = 4;          // Number of mounting holes
hole_margin = 25;       // Distance from the ends to the first/last hole
hole_dia = 4.5;         // Diameter of the screw shaft (e.g., #8 wood screw)
head_dia = 9.0;         // Diameter of the screw head
head_depth = 3.0;       // Depth of the countersink cone

// --- Calculated Values ---
front_straight = height - bevel_height;

// --- Main Assembly ---
difference() {
    // Base cleat profile
    // Rotated so the back (wall side) lies flat on the Z=0 build plate for easy printing
    rotate([90, 0, 90])
    linear_extrude(height = length)
    polygon([
        [0, 0],
        [height, 0],
        [height, top_flat],
        [front_straight, thickness],
        [0, thickness]
    ]);
    
    // Subtract mounting holes
    for (i = [0 : num_holes - 1]) {
        x_pos = hole_margin + i * ((length - 2 * hole_margin) / (num_holes - 1));
        translate([x_pos, front_straight / 2, 0])
        screw_hole();
    }
}

// --- Modules ---
module screw_hole() {
    // Screw shaft (extended slightly below 0 for a clean manifold cut)
    translate([0, 0, -1])
    cylinder(h = thickness + 2, d = hole_dia);
    
    // Countersink cone
    translate([0, 0, thickness - head_depth])
    cylinder(h = head_depth + 0.01, d1 = hole_dia, d2 = head_dia);
    
    // Extra clearance above the countersink to ensure a clean subtraction at the surface
    translate([0, 0, thickness])
    cylinder(h = 2, d = head_dia);
}