package snake
package web

import scala.scalajs.js
import scala.scalajs.js.Dynamic.global

// Four programs, one runtime: build-web.sh picks the entry point with --main-class.

private def canvas() = global.document.getElementById("game")

/** scala/index.html: Snake. */
object SnakeMain:
  def main(args: Array[String]): Unit = Runtime.runApp(App.main, BrowserPlatform(canvas()))

/** scala/pong.html: Pong (m11). */
object PongMain:
  def main(args: Array[String]): Unit = Runtime.runApp(pong.PongApp.pongMain, BrowserPlatform(canvas()))

/**
 * scala/replay.html: the replay viewer (m10). The recording is plain JSON next to the test fixtures; the page is served
 * from the repository root by scripts/serve.mjs, so it can be fetched (relative to the page, scala/replay.html).
 * The JSON is decoded by hand with js.Dynamic: `{seed, actions}`, each action `{"tag":"Tick"}` or
 * `{"tag":"Turn","dir":"Up"}`.
 */
object ReplayMain:
  private def action(a: js.Dynamic): Action = a.tag.asInstanceOf[String] match
    case "Tick" => Action.Tick
    case "Turn" => Action.Turn(Direction.valueOf(a.dir.asInstanceOf[String]))
    case other  => throw new IllegalArgumentException(s"a recording holds only Tick and Turn, not $other")

  private def recording(json: js.Dynamic): Recording =
    Recording(
      json.seed.asInstanceOf[Double].toLong,
      json.actions.asInstanceOf[js.Array[js.Dynamic]].toList.map(action)
    )

  def main(args: Array[String]): Unit =
    val loaded = global.fetch("../fixtures/replay-sample.json").`then`((r: js.Dynamic) => r.json())
    loaded.`then`((json: js.Dynamic) => Runtime.runApp(Replay.replayMain(recording(json)), BrowserPlatform(canvas())))

/** scala/life.html: Conway's Life with the mouse (m13). */
object LifeMain:
  def main(args: Array[String]): Unit = Runtime.runApp(life.LifeApp.lifeMain, BrowserPlatform(canvas()))