$fn = 64;

// --- PARAMETERS ---
palette_width = 160;  // Width of the wet palette tray
palette_depth = 120;  // Depth of the tray
angle = 15;           // Angle of the tray for easy access (degrees)
wall = 4;             // Wall thickness for rigidity
lip_height = 10;      // Height of the front and side retaining lips
back_height = 70;     // Height of the back mounting plate

// Wall mount hook parameters (ArtArsenal / Slatwall style)
hook_width = 25;      // Width of each mounting hook
hook_inset = 20;      // Distance of hooks from the left/right edges
hook_gap = 6;         // Gap for the wall rail
hook_drop = 12;       // Downward drop of the hook

// --- MAIN ASSEMBLY ---
wet_palette_holder();

module wet_palette_holder() {
    union() {
        // Main Backplate
        cube([palette_width, wall, back_height]);

        // Angled Tray
        translate([0, wall - 0.1, back_height - 15])
        rotate([-angle, 0, 0])
        union() {
            // Tray Base
            cube([palette_width, palette_depth, wall]);
            // Front Lip
            translate([0, palette_depth - wall, 0])
                cube([palette_width, wall, lip_height + wall]);
            // Left Lip
            cube([wall, palette_depth, lip_height + wall]);
            // Right Lip
            translate([palette_width - wall, 0, 0])
                cube([wall, palette_depth, lip_height + wall]);
        }

        // Support Gussets
        gusset();
        translate([palette_width / 2 - wall / 2, 0, 0]) gusset();
        translate([palette_width - wall, 0, 0]) gusset();

        // Wall Mount Hooks
        translate([hook_inset, 0, 0]) rail_hook();
        translate([palette_width - hook_inset - hook_width, 0, 0]) rail_hook();
    }
}

module gusset() {
    hull() {
        // Top point against backplate (touching bottom of tray)
        translate([0, wall - 0.5, back_height - 15 - 0.5])
            cube([wall, 0.5, 0.5]);

        // Bottom point against backplate
        translate([0, wall - 0.5, 10])
            cube([wall, 0.5, 0.5]);

        // Point along the tray (underneath)
        translate([0, wall + (palette_depth * 0.7) * cos(angle), back_height - 15 - (palette_depth * 0.7) * sin(angle) - 0.5])
            cube([wall, 0.5, 0.5]);
    }
}

module rail_hook() {
    // Extrude the hook profile along the X axis
    rotate([0, 90, 0])
    linear_extrude(hook_width)
    polygon([
        // Top hook over the rail
        [back_height, 0.1],
        [back_height, -hook_gap - wall],
        [back_height - hook_drop, -hook_gap - wall],
        [back_height - hook_drop - 2, -hook_gap - wall/2], // Chamfer for easy insertion
        [back_height - hook_drop, -hook_gap],
        [back_height - wall, -hook_gap],
        [back_height - wall, 0.1],
        
        // Bottom standoff to keep the holder parallel to the wall
        [5 + wall, 0.1],             
        [5 + wall, -hook_gap],       
        [5, -hook_gap],              
        [5, 0.1]                     
    ]);
}