import gary
import gary/array
import gleam/list
import gleam/option
import gleam/int
pub type SpiralArrayKey

pub type SpiralArray(a) {
  SpiralArray(key: SpiralArrayKey, size: Int)
}

@external(erlang, "erlang", "make_ref")
pub fn spiral_array_new_key() -> SpiralArrayKey

@external(erlang, "erlang", "put")
pub fn spiral_array_store(key: SpiralArrayKey, storage: gary.ErlangArray(option.Option(a))) -> b

@external(erlang, "erlang", "get")
pub fn spiral_array_load(key: SpiralArrayKey) -> gary.ErlangArray(option.Option(a))

pub fn spiral_array_from_storage(storage: gary.ErlangArray(option.Option(a)), size: Int) -> SpiralArray(a) {
  let key = spiral_array_new_key()
  let _ = spiral_array_store(key, storage)
  SpiralArray(key: key, size: size)
}

pub fn spiral_array_create(size: Int) -> SpiralArray(a) {
  list.repeat(option.None, size) |> array.from_list(option.None) |> spiral_array_from_storage(size)
}

pub fn spiral_array_create_filled(size: Int, value: a) -> SpiralArray(a) {
  list.repeat(option.Some(value), size) |> array.from_list(option.None) |> spiral_array_from_storage(size)
}

pub fn spiral_array_from_list(values: List(a)) -> SpiralArray(a) {
  values |> list.map(option.Some) |> array.from_list(option.None) |> spiral_array_from_storage(list.length(values))
}

pub fn spiral_array_to_list(xs: SpiralArray(a)) -> List(a) {
  list.repeat(Nil, xs.size) |> list.index_map(fn(_, i) { spiral_array_get(xs, i) })
}

pub fn spiral_array_get(xs: SpiralArray(a), i: Int) -> a {
  case i >= 0 && i < xs.size {
    True ->
      case spiral_array_load(xs.key) |> array.get(i) {
        Ok(option.Some(x)) -> x
        _ -> panic as "spiral array: read of an element that was never set"
      }
    False -> panic as "spiral array: index out of bounds"
  }
}

pub fn spiral_array_set(xs: SpiralArray(a), i: Int, value: a) -> Nil {
  case i >= 0 && i < xs.size {
    True -> {
      let assert Ok(storage) = spiral_array_load(xs.key) |> array.set(i, option.Some(value))
      let _ = spiral_array_store(xs.key, storage)
      Nil
    }
    False -> panic as "spiral array: index out of bounds"
  }
}

pub fn spiral_wrap_signed(value: Int, bits: Int) -> Int {
  let half = int.bitwise_shift_left(1, bits - 1)
  int.bitwise_and(value + half, int.bitwise_shift_left(1, bits) - 1) - half
}

pub fn spiral_wrap_unsigned(value: Int, bits: Int) -> Int {
  int.bitwise_and(value, int.bitwise_shift_left(1, bits) - 1)
}

pub type Us0 {
    Us0Empty
    Us0Values(f1i0 : SpiralArray(Int))
}
pub fn score_0(v0: Us0) -> Int {
    case v0  {
        Us0Empty -> {
            0
        }
        Us0Values(v1) -> {
            let v2 = v1.size
            let v3 = spiral_array_get(v1, 0)
            let v4 = spiral_wrap_signed(v2 + v3, 32)
            let v5 = spiral_array_get(v1, 1)
            let v6 = spiral_wrap_signed(v4 + v5, 32)
            v6
        }
    }
}
pub fn main() {
let v0 = 2
let v1 = spiral_array_create_filled(v0, 0)
spiral_array_set(v1, 0, 4)
spiral_array_set(v1, 1, 5)
let v2 = Us0Values(v1)
let v3 = score_0(v2)
let v4 = spiral_wrap_signed(v3 - 11, 32)
v4
}