import gleam/dynamic/decode.{type Decoder}
import gleam/option.{type Option}
import models/activity_level.{type ActivityLevel}
import models/supply_level.{type SupplyLevel}
import models/trade_good_type.{type TradeGoodType}
import models/trade_symbol.{type TradeSymbol}

pub type MarketTradeGood {
  MarketTradeGood(
    symbol: TradeSymbol,
    type_: TradeGoodType,
    trade_volume: Int,
    supply: SupplyLevel,
    activity: Option(ActivityLevel),
    purchase_price: Int,
    sell_price: Int,
  )
}

pub fn decoder() -> Decoder(MarketTradeGood) {
  use symbol <- decode.field("symbol", trade_symbol.decoder())
  use type_ <- decode.field("type", trade_good_type.decoder())
  use trade_volume <- decode.field("tradeVolume", decode.int)
  use supply <- decode.field("supply", supply_level.decoder())
  use activity <- decode.optional_field(
    "activity",
    option.None,
    decode.optional(activity_level.decoder()),
  )
  use purchase_price <- decode.field("purchasePrice", decode.int)
  use sell_price <- decode.field("sellPrice", decode.int)
  decode.success(MarketTradeGood(
    symbol:,
    type_:,
    trade_volume:,
    supply:,
    activity:,
    purchase_price:,
    sell_price:,
  ))
}