$fn=64;

// --- Parameters ---
res_dia = 120;              // Main reservoir diameter
res_h = 60;                 // Reservoir overall height
wall = 2.4;                 // Wall thickness
wick_dia = 35;              // Diameter of the central wicking column
fill_port_dia = 25;         // Diameter of the fill port
indicator_dia = 20;         // Diameter of the water indicator chamber
lip_depth = 15;             // Depth of the top seating lip for the upper pot
wick_h = res_h - lip_depth; // Height of the wick column

// --- 2D Profiles ---
module outer_profile() {
    union() {
        // Main body
        circle(d=res_dia);
        // Fill port extension
        hull() {
            circle(d=res_dia);
            translate([res_dia/2, 0]) circle(d=fill_port_dia + 2*wall);
        }
        // Indicator chamber extension
        hull() {
            circle(d=res_dia);
            translate([0, -res_dia/2]) circle(d=indicator_dia + 2*wall);
        }
    }
}

module inner_profile() {
    union() {
        // Main interior
        circle(d=res_dia - 2*wall);
        // Fill port interior
        hull() {
            circle(d=res_dia - 2*wall);
            translate([res_dia/2, 0]) circle(d=fill_port_dia);
        }
        // Indicator chamber interior
        hull() {
            circle(d=res_dia - 2*wall);
            translate([0, -res_dia/2]) circle(d=indicator_dia);
        }
    }
}

// --- 3D Construction ---
union() {
    difference() {
        // Main solid body
        linear_extrude(res_h) outer_profile();

        // Hollow out the interior
        translate([0, 0, wall])
            linear_extrude(res_h + 1) inner_profile();

        // Water level indicator window (recessed slot)
        translate([0, -res_dia/2 - indicator_dia/2 - wall/2, res_h/2 + wall])
            cube([8, wall + 2, res_h - 15], center=true);
    }

    // Thin translucent pane (0.8mm) to prevent leaking while allowing visibility
    // Made slightly wider (8.2mm) to ensure clean manifold intersection with walls
    translate([0, -res_dia/2 - indicator_dia/2 - wall + 0.4, res_h/2 + wall])
        cube([8.2, 0.8, res_h - 15], center=true);

    // Seating ledge for the upper pot
    translate([0, 0, res_h - lip_depth])
        difference() {
            // +1 diameter ensures clean union with the outer wall
            cylinder(d=res_dia - 2*wall + 1, h=lip_depth);
            translate([0, 0, -1])
                cylinder(d=res_dia - 6*wall, h=lip_depth + 2);
        }

    // Central wicking column
    difference() {
        cylinder(d=wick_dia, h=wick_h);
        
        translate([0, 0, wall])
            cylinder(d=wick_dia - 2*wall, h=wick_h + 1);

        // Slotted perforations for water ingress
        for(z = [wall + 4 : 8 : wick_h - 5]) {
            for(a = [0 : 45 : 135]) {
                rotate([0, 0, a])
                    translate([0, 0, z])
                        cube([wick_dia + 10, 2.5, 4], center=true);
            }
        }
    }
}