$fn = 64;

// --- Parameters ---
grid_x = 4;                 // Number of cells in X direction
grid_y = 6;                 // Number of cells in Y direction
cell_size = 30;             // Size of each square grid cell (mm)
plate_thickness = 5;        // Thickness of the baseplate (mm)

hole_diameter = 5;          // Diameter of the connection peg holes (mm)
dovetail_width_base = 12;   // Width of the dovetail at the edge (mm)
dovetail_width_tip = 18;    // Width of the dovetail at the tip (mm)
dovetail_length = 7;        // How far the dovetail extends (mm)
tolerance = 0.2;            // Clearance for the female dovetails (mm)

// --- Modules ---

// 2D profile for the interlocking dovetail
module dovetail_2d(is_female = false) {
    tol = is_female ? tolerance : 0;
    base_y = is_female ? -1 : 0; // Extend base slightly for clean boolean cut
    
    polygon([
        [-(dovetail_width_base/2) - tol, base_y],
        [ (dovetail_width_base/2) + tol, base_y],
        [ (dovetail_width_tip/2) + tol, dovetail_length + tol],
        [-(dovetail_width_tip/2) - tol, dovetail_length + tol]
    ]);
}

// Main 4x6 Modular Baseplate
module figure_stage_baseplate() {
    difference() {
        union() {
            // Main platform body
            cube([grid_x * cell_size, grid_y * cell_size, plate_thickness]);
            
            // Male dovetails (Right edge / +X)
            for(j = [0 : grid_y - 1]) {
                translate([grid_x * cell_size, j * cell_size + (cell_size / 2), 0])
                    linear_extrude(plate_thickness)
                        rotate(-90) dovetail_2d(false);
            }
            
            // Male dovetails (Top edge / +Y)
            for(i = [0 : grid_x - 1]) {
                translate([i * cell_size + (cell_size / 2), grid_y * cell_size, 0])
                    linear_extrude(plate_thickness)
                        rotate(0) dovetail_2d(false);
            }
        }
        
        // Female dovetails (Left edge / -X)
        for(j = [0 : grid_y - 1]) {
            translate([0, j * cell_size + (cell_size / 2), -1])
                linear_extrude(plate_thickness + 2)
                    rotate(-90) dovetail_2d(true);
        }
        
        // Female dovetails (Bottom edge / -Y)
        for(i = [0 : grid_x - 1]) {
            translate([i * cell_size + (cell_size / 2), 0, -1])
                linear_extrude(plate_thickness + 2)
                    rotate(0) dovetail_2d(true);
        }
        
        // Grid connection holes
        for(i = [0 : grid_x - 1]) {
            for(j = [0 : grid_y - 1]) {
                // Center hole
                translate([i * cell_size + (cell_size / 2), j * cell_size + (cell_size / 2), -1])
                    cylinder(d = hole_diameter, h = plate_thickness + 2);
                
                // Optional: Corner holes for maximum grid flexibility
                translate([i * cell_size, j * cell_size, -1])
                    if(i > 0 && j > 0) {
                        cylinder(d = hole_diameter, h = plate_thickness + 2);
                    }
            }
        }
    }
}

// --- Render ---
figure_stage_baseplate();