class_name TileDef
extends RefCounted
## A single tile definition (palette entry) within a tile layer.
##
## Maps a tile ID to its asset reference and gameplay flags. See
## docs/architecture/world.md §3.2.

## Tile ID (index into the layer palette). 0 is reserved for empty/air.
var id: int = 0

## Reference to the tile/terrain asset.
var asset_id: String = ""

## Whether this tile has collision.
var solid: bool = false

## Bitmask flags: bit 0 = walkable, bit 1 = climbable, bit 2 = liquid.
var flags: int = 0

## Number of visual variants for this tile.
var variants: int = 1


func _init(p_id: int = 0, p_asset_id: String = "", p_solid: bool = false,
		p_flags: int = 0, p_variants: int = 1) -> void:
	id = p_id
	asset_id = p_asset_id
	solid = p_solid
	flags = p_flags
	variants = p_variants


func is_walkable() -> bool:
	return (flags & 0x01) != 0


func is_climbable() -> bool:
	return (flags & 0x02) != 0


func is_liquid() -> bool:
	return (flags & 0x04) != 0