$fn = 64;

// Parametric dimensions
clip_length = 75;
clip_width = 15;
arm_thickness = 2.5;
hinge_inner_radius = 5;
hinge_thickness = 1.8;

module bag_clip() {
    // Extrude the entire 2D profile to make it perfectly 3D printable on its side
    // This orientation ensures maximum strength for the hinge and latch
    linear_extrude(height = clip_width) {
        union() {
            // 1. Flexible C-Hinge (Left side)
            difference() {
                circle(r = hinge_inner_radius + hinge_thickness);
                circle(r = hinge_inner_radius);
                // Cut the right half to create the "C" shape
                translate([0, -(hinge_inner_radius + hinge_thickness + 1)])
                    square([(hinge_inner_radius + hinge_thickness + 1) * 2, (hinge_inner_radius + hinge_thickness + 1) * 2]);
            }

            // 2. Bottom Arm
            translate([0, -hinge_inner_radius - hinge_thickness])
                square([clip_length, arm_thickness]);

            // 3. Bottom Jaw Platform (Clamping surface with slight overlap for manifoldness)
            translate([15, -hinge_inner_radius - hinge_thickness + arm_thickness - 0.1])
                square([clip_length - 35, hinge_inner_radius + hinge_thickness - arm_thickness - 0.5 + 0.1]);

            // 4. Bottom Teeth (Grip)
            for(i = [25 : 10 : 45]) {
                translate([i, -0.5]) circle(r = 1.5);
            }

            // 5. Top Arm with Jaw Platform and Thumb Tab
            difference() {
                union() {
                    // Main top arm
                    translate([0, hinge_inner_radius + hinge_thickness - arm_thickness])
                        square([clip_length - 2, arm_thickness]);

                    // Top Jaw Platform
                    translate([15, 1.5])
                        square([clip_length - 35, hinge_inner_radius + hinge_thickness - arm_thickness - 1.5 + 0.1]);

                    // Rounded tip for smooth snapping over the latch
                    translate([clip_length - 2, hinge_inner_radius + hinge_thickness - arm_thickness / 2])
                        circle(d = arm_thickness + 0.1);

                    // Thumb tab on top arm for easier pressing
                    translate([clip_length - 12, hinge_inner_radius + hinge_thickness])
                        polygon([[0, 0], [8, 0], [6, 3], [2, 3]]);
                }
                // Top Grooves (Matches bottom teeth for tight interlocking)
                for(i = [25 : 10 : 45]) {
                    translate([i, 1.5]) circle(r = 2.0);
                }
            }

            // 6. Snap Latch / Hook on Bottom Arm
            hook_x = clip_length;
            polygon([
                [hook_x - 0.1, -hinge_inner_radius - hinge_thickness], // slight overlap with bottom arm
                [hook_x + 4, -hinge_inner_radius - hinge_thickness],
                [hook_x + 4, 5],
                [hook_x + 8, 5],     // Release thumb tab bottom
                [hook_x + 8, 7.5],   // Release thumb tab top
                [hook_x, 7.5],       // Hook top
                [hook_x - 3, 5.0],   // Catch lip tip (chamfered for snap-fit)
                [hook_x, 3.5]        // Catch resting surface
            ]);
        }
    }
}

// Center the model on the build plate
translate([-clip_length / 2, 0, 0])
    bag_clip();