// Blade Dimensions

diameter = 100;       // Base diameter
height = 100;         // Height of the rotor
wall_thickness = 6;   // Wall thickness
tolerance = 2;        // Tolerance between stator and rotor
number_of_ports = 6;  // Number of ports [2:8]
port_height = 50;     // Height of the port
pressure_zone = 0.4; // Define this globally with an appropriate default value
mounting_hole_diameter = 4;     // Diameter of mounting holes
mounting_hole_offset = 20;      // Radial distance from center to hole centers
number_of_mounting_holes = 4;        // Number of mounting holes
mounting_hole_bore = 8;        // Diameter of mounting holes counterbore
round_radius = 4;
motor_shaft_diameter = 5;
hub_height = 10;

motor_width = 20;  // Diameter of the motor shaft
$fn = 128;            // Number of fragments

diameter = 100;
blade_width = 5;
blade_length = diameter;

// Blade Height
blade_height = 10;

// Number of ports/blades
number_of_ports = 5;

// Pressure zone percentage 
pressure_zone = 0.4; // 30% of diameter

module impeller_blades() {
    difference() {
        intersection() {
            // Column with full diameter
            cylinder(d = diameter, h = blade_height);
            
            // Blades
            union() {
                //rotate([180, 180, 180])
                for (i = [0:360/number_of_ports:360]) {
                    rotate([0, 0, i - 90])
                    translate([0, diameter / 2, 0])
                    rotate([0, 0, 10])
                    translate([-blade_width, -diameter / 2, 0])
                    linear_extrude(height = blade_height, twist = 0, slices=360)
                    square([blade_width, blade_length]);
                }
            }
        }
        // Subtract core cylinder
        translate([0, 0, -1])
        cylinder(d = diameter * pressure_zone, h = blade_height + 2);
    }
}

module ports() {
    radius = diameter / 2;
    angle = 360 / number_of_ports / 2;
    
    rotate([0, 0, 180 / number_of_ports])
    for (i = [0:360/number_of_ports:360]) {
        rotate([0, 0, i])
        translate([0, 0, (height - port_height) / 2])
        linear_extrude(height = port_height)
        polygon(concat(
            [[0, 0]],  // Center point
            [for (j = [0 : $fn]) 
                [radius * cos(angle * j / $fn), 
                 radius * sin(angle * j / $fn)]]
        ));
    }
}

// Optional: If you want to render the blades independently for testing
impeller_blades();
ports();