$fn=64;

// --- Parameters ---
cable_diameter = 7;      // Inner diameter for the hidden vertical cable
wall_thickness = 2.5;    // Thickness of the pole walls
height = 150;            // Total height of the banner pole
banner_width = 60;       // Width of the banner fabric
banner_thickness = 3;    // Thickness of the fabric
slit_width = 5.5;        // Width of the rear slit (slightly smaller than cable to snap in)

// --- Derived Dimensions ---
pole_outer = cable_diameter + (wall_thickness * 2);
crossbar_height = height - 20;
fabric_height = crossbar_height + 5;

union() {
    // 1. Vertical Pole (Cable Hider)
    difference() {
        // Main pole body
        cylinder(d=pole_outer, h=height);
        
        // Hollow center for the cable
        translate([0, 0, -1])
            cylinder(d=cable_diameter, h=height + 2);
            
        // Rear slit to snap over the wall cable
        translate([-slit_width/2, -pole_outer, -1])
            cube([slit_width, pole_outer, height + 2]);
    }
    
    // Top Pole Finial
    translate([0, 0, height])
        cylinder(d1=pole_outer, d2=2, h=8);
    translate([0, 0, height + 8])
        sphere(d=4);

    // 2. Banner Fabric
    difference() {
        // Main fabric block (intersects slightly with pole for manifold mesh)
        translate([-banner_width/2, pole_outer/2 - 0.5, 0])
            cube([banner_width, banner_thickness + 0.5, fabric_height]);
            
        // Swallowtail cut at the bottom
        // Designed to leave two flat feet on the sides for easy, supportless 3D printing
        translate([0, pole_outer/2 - 1, 0])
            hull() {
                translate([-banner_width/2 + 10, 0, -1])
                    cube([banner_width - 20, banner_thickness + 2, 1]);
                translate([0, 0, 25])
                    cube([0.1, banner_thickness + 2, 0.1]);
            }
    }

    // 3. Top Crossbar
    // Embedded into the fabric front so it doesn't require supports
    translate([0, pole_outer/2 + banner_thickness/2, crossbar_height])
        rotate([0, 90, 0])
            cylinder(d=5, h=banner_width + 4, center=true);
            
    // Crossbar Finials
    translate([-(banner_width + 4)/2, pole_outer/2 + banner_thickness/2, crossbar_height])
        sphere(d=7);
    translate([(banner_width + 4)/2, pole_outer/2 + banner_thickness/2, crossbar_height])
        sphere(d=7);

    // 4. Medieval Shield Emblem
    translate([0, pole_outer/2 + banner_thickness - 0.5, height/2 - 15]) {
        // Shield Base
        hull() {
            translate([-13, 0, 15])
                cube([26, 2, 15]);
            translate([0, 0, 0])
                cube([0.1, 2, 0.1]);
        }
        
        // Raised Cross Detail
        translate([0, 1.5, 15]) {
            cube([4, 2, 26], center=true);
            translate([0, 0, 3])
                cube([22, 2, 4], center=true);
        }
    }
}