package game

import (
	"time"
)

// Action is a platform-neutral semantic input action, dispatched to the
// engine independent of the originating input device (keyboard, touch, etc)
type Action uint8

const (
	ActionNone      Action = iota
	ActionMoveLeft         // grid: dx=-1
	ActionMoveUp           // grid: dy=-1
	ActionMoveDown         // grid: dy=+1
	ActionMoveRight        // grid: dx=+1

	// Reserved, behavior defined later
	ActionStubSemicolon
	ActionStubA
	ActionStubS
	ActionStubD
	ActionStubF
	ActionSpace
	ActionConfirm
)

// Dispatch applies a single Action to the game state, gated by phase.
// Requires current time to timestamp temporal state shifts
func (gs *GameState) Dispatch(a Action, now time.Time) {
	if gs.Paused {
		return
	}
	switch gs.Phase {
	case PhaseGameOver:
		if a == ActionConfirm {
			gs.restart(now)
		}
		return
	case PhaseLevelClear:
		return // input inert during transition
	}

	switch a {
	case ActionMoveLeft:
		gs.MovePlayer(0, -1, now)
	case ActionMoveUp:
		gs.MovePlayer(-1, 0, now)
	case ActionMoveDown:
		gs.MovePlayer(1, 0, now)
	case ActionMoveRight:
		gs.MovePlayer(0, 1, now)
	}
}