// Machines: buildings with item slots that process their own recipes over time.
// Interacting with a machine opens its window; put items into the input slots
// and collect the results from the output slots.
//
// Fields:
//   id              id of the building this machine belongs to (required)
//   input_slots     number of input slots (1)
//   output_slots    number of output slots (1)
//   recipes         [{ id, name, inputs, outputs, time (seconds, default 1.0) }]
//                   The first recipe whose inputs are present and whose outputs
//                   fit is processed.
//   active_variant  building variant shown while working
//   ui              window layout, everything optional:
//     background    PNG drawn behind the slots (relative to assets/)
//     size          (width, height) of the window content in pixels
//     slot_size     slot size in pixels (40)
//     inputs        one (x, y) per input slot; default: column on the left
//     outputs       one (x, y) per output slot; default: column on the right
//     progress      progress bar (x, y, width, height); default: between the columns
machines: [
    {
        id: "furnace",
        input_slots: 2,
        output_slots: 1,
        active_variant: Some("lit"),
        recipes: [
            {
                id: "smelt_iron",
                name: Some("Smelt iron plates"),
                inputs: [("iron_ore", 4), ("log", 1)],
                outputs: [("iron_plate", 2)],
                time: 4.0,
            },
        ],
    },
    {
        id: "assembler",
        input_slots: 3,
        output_slots: 1,
        active_variant: Some("active"),
        recipes: [
            { id: "assemble_wrench", inputs: [("iron_plate", 2)], outputs: [("wrench", 1)], time: 3.0 },
            { id: "assemble_screwdriver", inputs: [("iron_plate", 1), ("plank", 1)],
              outputs: [("screwdriver", 1)], time: 3.0 },
        ],
        ui: {
            background: Some("ui/machines/assembler.png"),
            size: Some((260.0, 150.0)),
            inputs: [(16.0, 14.0), (16.0, 96.0), (70.0, 55.0)],
            outputs: [(200.0, 55.0)],
            progress: Some((124.0, 69.0, 60.0, 12.0)),
        },
    },
]