last_light/game/world/entity_map.go

package world

import (
	"maps"
	"mvvasilev/last_light/engine"
	"mvvasilev/last_light/game/model"

	"github.com/gdamore/tcell/v2"
	"github.com/google/uuid"
)

type EntityMap struct {
	entities map[int]EntityTile

	engine.Sized
}

func CreateEntityMap(width, height int) *EntityMap {
	return &EntityMap{
		entities: make(map[int]EntityTile, 0),
		Sized:    engine.WithSize(engine.SizeOf(width, height)),
	}
}

func (em *EntityMap) SetTileAt(x int, y int, t Tile) Tile {
	return nil
	// if !em.FitsWithin(x, y) {
	// 	return
	// }

	// index := em.Size().AsArrayIndex(x, y)

	// TODO? May not be necessary
}

func (em *EntityMap) FindEntityByUuid(uuid uuid.UUID) (key int, entity EntityTile) {
	for i, e := range em.entities {
		if e.Entity().UniqueId() == uuid {
			return i, e
		}
	}

	return -1, nil
}

func (em *EntityMap) AddEntity(entity model.MovableEntity, presentation rune, style tcell.Style) {
	if !em.FitsWithin(entity.Position().XY()) {
		return
	}

	key := em.Size().AsArrayIndex(entity.Position().XY())
	et := CreateBasicEntityTile(entity, presentation, style)

	em.entities[key] = et
}

func (em *EntityMap) DropEntity(uuid uuid.UUID) {
	maps.DeleteFunc(em.entities, func(i int, et EntityTile) bool {
		return et.Entity().UniqueId() == uuid
	})
}

func (em *EntityMap) MoveEntity(uuid uuid.UUID, dx, dy int) {
	oldKey, e := em.FindEntityByUuid(uuid)

	if e == nil {
		return
	}

	if !em.FitsWithin(e.Entity().Position().WithOffset(dx, dy).XY()) {
		return
	}

	delete(em.entities, oldKey)

	newPos := e.Entity().Position().WithOffset(dx, dy)
	e.Entity().MoveTo(newPos)

	newKey := em.Size().AsArrayIndex(e.Entity().Position().XY())

	em.entities[newKey] = e
}

func (em *EntityMap) MoveEntityTo(uuid uuid.UUID, x, y int) {
	oldKey, e := em.FindEntityByUuid(uuid)

	if e == nil {
		return
	}

	if !em.FitsWithin(x, y) {
		return
	}

	delete(em.entities, oldKey)

	e.Entity().MoveTo(engine.PositionAt(x, y))

	newKey := em.Size().AsArrayIndex(e.Entity().Position().XY())

	em.entities[newKey] = e
}

func (em *EntityMap) TileAt(x int, y int) Tile {
	if !em.FitsWithin(x, y) {
		return CreateStaticTile(x, y, TileTypeVoid())
	}

	key := em.Size().AsArrayIndex(x, y)

	return em.entities[key]
}

func (em *EntityMap) Tick(dt int64) {
	for _, e := range em.entities {
		e.Entity().Tick(dt)
	}
}