package scripting

import "git.kirsle.net/go/render"

/*
RegisterEventHooks attaches the supervisor level event hooks into a JS VM.

Names registered:

  - EndLevel(): for a doodad to exit the level. Panics if the OnLevelExit
    handler isn't defined.
  - FailLevel(): for a doodad to cause a level failure.
  - SetCheckpoint(): update the player's respawn location.
*/
func RegisterEventHooks(s *Supervisor, vm *VM) {
	vm.Set("EndLevel", func() {
		if s.onLevelFail == nil {
			panic("JS FailLevel(): No OnLevelFail handler attached to script supervisor")
		}
		s.onLevelExit()
	})
	vm.Set("FailLevel", func(message string) {
		if s.onLevelFail == nil {
			panic("JS FailLevel(): No OnLevelFail handler attached to script supervisor")
		}
		s.onLevelFail(message)
	})
	vm.Set("SetCheckpoint", func(p render.Point) {
		if s.onSetCheckpoint == nil {
			panic("JS SetCheckpoint(): No OnSetCheckpoint handler attached to script supervisor")
		}
		s.onSetCheckpoint(p)
	})
}

// OnLevelExit registers an event hook for when a Level Exit doodad is reached.
func (s *Supervisor) OnLevelExit(handler func()) {
	s.onLevelExit = handler
}

// OnLevelFail registers an event hook for level failures (doodads killing the player).
func (s *Supervisor) OnLevelFail(handler func(string)) {
	s.onLevelFail = handler
}

// OnSetCheckpoint registers an event hook for setting player checkpoints.
func (s *Supervisor) OnSetCheckpoint(handler func(render.Point)) {
	s.onSetCheckpoint = handler
}