package nova.monadic_sfx.ui.components.todo

import com.softwaremill.quicklens._
import io.circe.generic.JsonCodec
import io.odin.Logger
import monix.bio.Task
import nova.monadic_sfx.util.reactive.Middlewares.actionLoggerMiddleware
import nova.monadic_sfx.util.reactive.Reducer
import nova.monadic_sfx.util.reactive.Store

case class Todo(id: Int, content: String)

object TodoListStore {

  @JsonCodec
  sealed trait Command
  case object Init extends Command
  case class Add(content: String) extends Command
  case class Edit(id: Int, content: String) extends Command
  case class Delete(id: Int) extends Command

  case class State(todos: Vector[Todo], counter: Int)

  def reducer(
      state: State,
      action: Command
  ) =
    action match {
      case Init => state
      case Add(content) =>
        state.copy(
          todos = state.todos :+ Todo(state.counter, content),
          counter = state.counter + 1
        )
      case Edit(_id, content) =>
        val condition: Todo => Boolean = _.id == _id
        state
          .modify(_.todos.eachWhere(condition))
          .using(_.copy(content = content))
      case Delete(id) =>
        state.copy(state.todos.filterNot(_.id == id))
    }

  def apply(logger: Logger[Task]) =
    Store
      .createL[Command, State](
        Init,
        State(Vector.empty[Todo], 0),
        Reducer(reducer _),
        Seq(actionLoggerMiddleware(logger))
      )
}