$fn=64;

// --- Parameters ---
batt_diam = 11.2;     // AAA battery diameter + clearance
batt_depth = 25.0;    // Depth of the slots
rows = 3;             // Number of rows
cols = 4;             // Number of columns (12 batteries total)
wall_thick = 2.5;     // Outer wall thickness
spacing = 2.0;        // Spacing between batteries
floor_thick = 2.0;    // Bottom thickness

// --- Calculated Dimensions ---
box_w = (cols * batt_diam) + ((cols - 1) * spacing) + (2 * wall_thick);
box_d = (rows * batt_diam) + ((rows - 1) * spacing) + (2 * wall_thick);
box_h = batt_depth + floor_thick;

difference() {
    // Main Body (Rounded Box)
    hull() {
        for(x = [wall_thick, box_w - wall_thick]) {
            for(y = [wall_thick, box_d - wall_thick]) {
                translate([x, y, 0])
                    cylinder(r=wall_thick, h=box_h);
            }
        }
    }

    // Battery Slots and Labels
    for (r = [0 : rows - 1]) {
        for (c = [0 : cols - 1]) {
            x_pos = wall_thick + (batt_diam / 2) + c * (batt_diam + spacing);
            y_pos = wall_thick + (batt_diam / 2) + r * (batt_diam + spacing);
            
            // The slot cylinder
            translate([x_pos, y_pos, floor_thick])
                cylinder(h = box_h + 1, d = batt_diam);
                
            // Slot number debossed into the floor of each slot
            num = r * cols + c + 1;
            translate([x_pos, y_pos, floor_thick - 0.6])
                linear_extrude(1)
                text(str(num), size=5, halign="center", valign="center", font="Arial:style=Bold");
        }
    }

    // Main "AAA" label debossed on the front face
    translate([box_w / 2, 1, box_h / 2])
        rotate([90, 0, 0])
        linear_extrude(2)
        text("AAA", size=10, halign="center", valign="center", font="Arial:style=Bold");
}