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

pub opaque type MarketSymbol {
  MarketSymbol(String)
}

pub const min_length: Int = 1

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

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

pub fn to_string(market_symbol: MarketSymbol) -> String {
  let MarketSymbol(symbol) = market_symbol
  symbol
}

pub fn encode(market_symbol: MarketSymbol) -> Json {
  json.string(to_string(market_symbol))
}