package scripting

import (
	"git.kirsle.net/SketchyMaze/doodle/pkg/scripting/api"
	"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) {
	api.GameplayLevelControl{
		EndLevel: func() {
			if s.onLevelFail == nil {
				panic("JS FailLevel(): No OnLevelFail handler attached to script supervisor")
			}
			s.onLevelExit()
		},
		FailLevel: func(message string) {
			if s.onLevelFail == nil {
				panic("JS FailLevel(): No OnLevelFail handler attached to script supervisor")
			}
			s.onLevelFail(message)
		},
		SetCheckpoint: func(p render.Point) {
			if s.onSetCheckpoint == nil {
				panic("JS SetCheckpoint(): No OnSetCheckpoint handler attached to script supervisor")
			}
			s.onSetCheckpoint(p)
		},
	}.Register(vm.vm)
}

// 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
}