import gleam/dynamic/decode.{type Decoder}
import gleam/json.{type Json}
import gleam/string

pub opaque type ShipSymbol {
  ShipSymbol(String)
}

pub const min_length: Int = 1

pub fn parse(value: String) -> Result(ShipSymbol, Nil) {
  case string.length(value) >= min_length {
    True -> Ok(ShipSymbol(value))
    False -> Error(Nil)
  }
}

pub fn decoder() -> Decoder(ShipSymbol) {
  use value <- decode.then(decode.string)
  case parse(value) {
    Ok(ship_symbol) -> decode.success(ship_symbol)
    Error(Nil) -> decode.failure(ShipSymbol("invalid"), "ShipSymbol")
  }
}

pub fn to_string(ship_symbol: ShipSymbol) -> String {
  let ShipSymbol(symbol) = ship_symbol
  symbol
}

pub fn encode(ship_symbol: ShipSymbol) -> Json {
  json.string(to_string(ship_symbol))
}