// Parametric Modular Interlocking Facade Quadrant (Top-Left / Q1)
// For 6U Open-Source Storage Array
// Standard Units: Millimeters (mm)

$fn = 48;

quad_w = 218.0;
quad_h = 130.0;
quad_depth = 18.0;
wall_t = 3.5;

// Dovetail parameters
dt_root = 12.0;
dt_tip = 18.0;
dt_len = 10.0;
dt_h = quad_h;

module male_dovetail() {
    linear_extrude(height=quad_depth) {
        polygon(points=[
            [0, -dt_root/2],
            [dt_len, -dt_tip/2],
            [dt_len, dt_tip/2],
            [0, dt_root/2]
        ]);
    }
}

module female_dovetail_slot() {
    // 0.2mm tolerance clearance
    tol = 0.2;
    linear_extrude(height=quad_depth + 2) {
        polygon(points=[
            [-1, -dt_root/2 - tol],
            [dt_len + tol, -dt_tip/2 - tol],
            [dt_len + tol, dt_tip/2 + tol],
            [-1, dt_root/2 + tol]
        ]);
    }
}

module facade_q1() {
    difference() {
        union() {
            // Main Plate Block
            cube([quad_w, quad_h, quad_depth]);
            
            // Right Edge Male Dovetails (at Y=30 and Y=90)
            translate([quad_w, 35.0, 0])
                male_dovetail();
            translate([quad_w, 95.0, 0])
                male_dovetail();
        }
        
        // 4x Drive Bay Windows (Bays 0, 1, 2, 3)
        // Each Bay: 26.0mm width x 115.0mm height, pitch: 49.5mm
        for (b = [0:3]) {
            translate([15.0 + b*49.5, 10.0, -1]) {
                cube([28.0, 110.0, quad_depth + 2]);
                // Guide Rail Channels (1.5mm slot)
                translate([-1.5, 0, quad_depth/2 - 1.5])
                    cube([31.0, 110.0, 3.0]);
            }
        }
        
        // Bottom Edge Female Dovetail Slots (for interlocking with Q3 below)
        translate([50.0, 0, -1])
            rotate([0, 0, 90])
                female_dovetail_slot();
        translate([150.0, 0, -1])
            rotate([0, 0, 90])
                female_dovetail_slot();
                
        // M4 Heat-Set Brass Insert Pockets for 2020 Frame Mounting (Top Edge)
        // Ø5.6mm, depth 6.0mm
        translate([20.0, quad_h - 10.0, quad_depth - 6.0])
            cylinder(d=5.6, h=7.0);
        translate([110.0, quad_h - 10.0, quad_depth - 6.0])
            cylinder(d=5.6, h=7.0);
        translate([195.0, quad_h - 10.0, quad_depth - 6.0])
            cylinder(d=5.6, h=7.0);
            
        // Left Edge Rack Ear Flange Mounting Recess
        translate([-1, 0, -1])
            cube([10.0, quad_h + 2, 3.0]);
    }
}

facade_q1();