import gleam/dynamic/decode.{type Decoder}
import gleam/option.{type Option}

pub type ShipRequirements {
  ShipRequirements(power: Option(Int), crew: Option(Int), slots: Option(Int))
}

pub fn decoder() -> Decoder(ShipRequirements) {
  use power <- decode.optional_field(
    "power",
    option.None,
    decode.optional(decode.int),
  )
  use crew <- decode.optional_field(
    "crew",
    option.None,
    decode.optional(decode.int),
  )
  use slots <- decode.optional_field(
    "slots",
    option.None,
    decode.optional(decode.int),
  )
  decode.success(ShipRequirements(power:, crew:, slots:))
}