$fn = 64;

// --- Parameters ---
num_slots = 7;      // 7 days of the week
slot_width = 22;    // Internal width of each slot (X)
slot_length = 30;   // Internal length of each slot (Y)
slot_depth = 18;    // Internal depth of each slot (Z)

wall = 3;           // Wall thickness
lid_thickness = 2;  // Thickness of the sliding lid
tolerance = 0.5;    // Clearance for sliding fit
groove = 1.5;       // Depth of the sliding groove

// --- Calculated Dimensions ---
tray_width = (slot_width * num_slots) + (wall * (num_slots + 1));
tray_length = slot_length + (wall * 2);
tray_height = wall + slot_depth + lid_thickness + tolerance + wall;

days = ["M", "T", "W", "T", "F", "S", "S"];

// --- Tray Module ---
module tray() {
    difference() {
        // Main body
        cube([tray_width, tray_length, tray_height]);
        
        for (i = [0 : num_slots - 1]) {
            // Hollow out the daily slots
            translate([wall + i * (slot_width + wall), wall, wall])
                cube([slot_width, slot_length, tray_height]);
            
            // Debossed day letters on the front wall
            translate([wall + i * (slot_width + wall) + (slot_width / 2), 1.1, tray_height / 2])
                rotate([90, 0, 0])
                linear_extrude(2)
                text(days[i], size=slot_width * 0.45, halign="center", valign="center", font="sans-serif:style=Bold");
        }
        
        // Sliding lid track (groove)
        // Starts from x=-1, stops at the inside of the right wall
        translate([-1, wall - groove, wall + slot_depth])
            cube([tray_width - wall + 1, slot_length + (groove * 2), lid_thickness + tolerance]);
            
        // Cutout top lip on the left side to allow lid insertion
        translate([-1, wall - groove, wall + slot_depth])
            cube([wall + 1, slot_length + (groove * 2), tray_height]);
    }
}

// --- Lid Module ---
module lid() {
    lid_width = tray_width - wall - tolerance;
    lid_length = slot_length + (groove * 2) - tolerance;
    
    union() {
        // Main lid flat
        cube([lid_width, lid_length, lid_thickness]);
        
        // End cap / Grip (fills the entrance cutout and serves as a handle)
        translate([0, 0, lid_thickness])
            cube([wall - tolerance, lid_length, wall]);
    }
}

// --- Render ---
tray();

// Render lid next to the tray for easy 3D printing
translate([0, tray_length + 10, 0])
    lid();