// SPDX-License-Identifier: CC-BY-SA-4.0
//
// OpenScribe parametric enclosure (OpenSCAD).
//
// M0 scaffold: a parametric two-part shell sized from the board + battery dimensions, with
// the openings a recorder needs (mic port, button, USB, LED). Milestone M8 measures the
// chosen build from hardware/BOM.md, tunes these parameters, and adds mount/clip features
// and print-in-place tolerances. Render each half and export STL from there.
//
// Usage: set `part = "bottom" | "top" | "both"` and F5/F6 to preview/render.

/* [Which part] */
part = "both";              // ["both","bottom","top"]

/* [Board] (default: XIAO ESP32-S3 Sense - Build A) */
board_l = 21.0;             // board length (mm)
board_w = 17.5;             // board width (mm)
board_h = 3.5;             // board thickness incl. components (mm)

/* [Battery] (default: ~502030 LiPo) */
batt_l = 30.0;
batt_w = 20.0;
batt_h = 5.5;

/* [Enclosure] */
wall = 1.6;                 // wall thickness (mm)
gap  = 0.8;                 // clearance around internals (mm)
corner_r = 3.0;             // outer corner radius (mm)
lid_lip = 1.2;             // overlap between top and bottom (mm)

/* [Openings] */
mic_port_d = 1.2;          // acoustic port diameter (mm)
usb_w = 9.5; usb_h = 3.4;   // USB-C cutout
button_d = 4.0;            // button plunger hole
led_d = 2.5;               // LED light-pipe hole

// ---- derived internal cavity ----
inner_l = max(board_l, batt_l) + 2*gap;
inner_w = board_w + batt_w + 3*gap;      // board beside battery
inner_h = max(board_h, batt_h) + 2*gap;
outer_l = inner_l + 2*wall;
outer_w = inner_w + 2*wall;
outer_h = inner_h + 2*wall;

module rrect(l, w, h, r) {
    hull() for (x=[r, l-r], y=[r, w-r])
        translate([x, y, 0]) cylinder(h=h, r=r, $fn=48);
}

module shell(height) {
    difference() {
        rrect(outer_l, outer_w, height, corner_r);
        translate([wall, wall, wall])
            rrect(outer_l-2*wall, outer_w-2*wall, height, max(0.5, corner_r-wall));
    }
}

module bottom() {
    h = outer_h*0.55;
    difference() {
        shell(h);
        // USB-C cutout on one short side
        translate([-1, (outer_w-usb_w)/2, wall+1])
            cube([wall+2, usb_w, usb_h]);
    }
}

module top() {
    h = outer_h*0.55;
    difference() {
        shell(h);
        // mic acoustic port (top face)
        translate([outer_l*0.5, outer_w*0.5, h-wall-1])
            cylinder(h=wall+2, d=mic_port_d, $fn=24);
        // record button hole
        translate([outer_l*0.75, outer_w*0.5, h-wall-1])
            cylinder(h=wall+2, d=button_d, $fn=24);
        // LED light-pipe hole
        translate([outer_l*0.25, outer_w*0.5, h-wall-1])
            cylinder(h=wall+2, d=led_d, $fn=24);
    }
}

if (part == "both") {
    bottom();
    translate([0, outer_w + 6, 0]) top();
} else if (part == "bottom") {
    bottom();
} else {
    top();
}