$fn = 128;

// --- Parametric Dimensions ---
base_radius = 45;
base_height = 10;
pillar_height = 90;
stand_angle = 35;

backplate_w = 75;
backplate_h = 210;
backplate_t = 6;
phone_thickness = 14;

spring_start_y = 195;
grip_y = 148;

// --- Main Assembly ---
union() {
    // Sturdy elongated base
    hull() {
        translate([0, 30, 0]) cylinder(r=base_radius, h=base_height);
        translate([0, -40, 0]) cylinder(r=base_radius, h=base_height);
    }
    
    // Tapered pillar
    hull() {
        translate([0, -10, base_height])
            cylinder(r=22, h=0.1);
        translate([0, 0, base_height + pillar_height - 10])
            cylinder(r=15, h=10);
    }
    
    // Cradle Mount (tilted back)
    translate([0, 0, base_height + pillar_height])
        rotate([stand_angle, 0, 0]) {
            // Position cradle so the phone sits centrally over the base
            translate([0, -80, 0])
                cradle();
            
            // Mounting bracket bridging the pillar and backplate
            translate([0, 0, -backplate_t/2 - 5])
                cube([30, 50, 10], center=true);
        }
}

// --- Modules ---

module cradle() {
    // Main backplate with track cutout
    difference() {
        translate([0, backplate_h/2, 0])
            cube([backplate_w, backplate_h, backplate_t], center=true);
        
        // Cutout for the compliant spring and grip movement
        translate([0, 160, 0])
            cube([46, 75, backplate_t + 2], center=true);
    }

    // Anchor block to fuse the top of the spring to the backplate
    translate([0, 197.5, 0])
        cube([40, 5, backplate_t], center=true);

    // Fixed Bottom Support
    // Bottom shelf
    translate([0, 5, backplate_t/2 + phone_thickness/2])
        cube([backplate_w, 10, phone_thickness], center=true);
    // Bottom front retaining lip
    translate([0, 5, backplate_t/2 + phone_thickness + 2])
        cube([backplate_w, 10, 4], center=true);

    // Compliant Print-in-Place Spring
    zigzag_spring(spring_start_y);

    // Moving Top Grip (Spring-loaded)
    // Base of grip (slides within the cutout)
    translate([0, grip_y, 0])
        cube([40, 10, backplate_t], center=true);
    // Shelf of grip
    translate([0, grip_y, backplate_t/2 + phone_thickness/2])
        cube([40, 10, phone_thickness], center=true);
    // Front retaining lip of grip
    translate([0, grip_y, backplate_t/2 + phone_thickness + 2])
        cube([40, 10, 4], center=true);
        
    // Quick-release thumb tab (angled wedge for easy pressing)
    hull() {
        translate([0, grip_y, backplate_t/2 + phone_thickness + 2])
            cube([20, 10, 4], center=true);
        translate([0, grip_y + 10, backplate_t/2 + phone_thickness + 12])
            cube([20, 2, 4], center=true);
    }
}

module zigzag_spring(start_y) {
    zig_w = 40;
    zig_h = 2;
    gap = 4;
    zig_t = backplate_t;
    num_ribs = 8;
    
    // Horizontal flexing ribs
    for(i=[0:num_ribs-1]) {
        translate([0, start_y - i*(zig_h+gap), 0])
            cube([zig_w, zig_h, zig_t], center=true);
    }
    
    // Alternating side connectors to form the continuous zigzag
    for(i=[0:num_ribs-2]) {
        side = (i%2 == 0) ? 1 : -1;
        translate([side * (zig_w/2 - zig_h/2), start_y - i*(zig_h+gap) - (gap+zig_h)/2, 0])
            cube([zig_h, gap + zig_h, zig_t], center=true);
    }
}