extends Node2D
## Phase 4 world view. 80×80 TileMap, 6 layers, 3 pawns, full AI pipeline:
##   RestProvider → ChopProvider → MineProvider → HaulingProvider → idle
## plus sample trees, rocks, and two stockpile zones with different priorities
## for the haul-cascade demo.
##
## TileMap layer indices follow docs/architecture.md:
##   0 Terrain · 1 Floor · 2 Wall · 3 Designation · 4 Roof · 5 Fog

const MAP_SIZE_TILES: Vector2i = Vector2i(80, 80)
const TILE_SIZE_PX: int = 16

const TILE_GRASS: Vector2i = Vector2i(0, 0)
const TILE_DIRT: Vector2i = Vector2i(1, 0)
const TILE_STONE: Vector2i = Vector2i(2, 0)
const TILE_STONE_DARK: Vector2i = Vector2i(3, 0)

const PLACEHOLDER_SOURCE_ID: int = 0

const PAWN_SCENE: PackedScene = preload("res://scenes/pawn/pawn.tscn")
const TREE_SCENE: PackedScene = preload("res://scenes/entities/tree.tscn")
const ROCK_SCENE: PackedScene = preload("res://scenes/entities/rock.tscn")
const STOCKPILE_SCENE: PackedScene = preload("res://scenes/world/stockpile_zone.tscn")

# 3 starting pawns — Phase 2 demo. Phase 7+ replaces this with map-gen + name table.
const SAMPLE_PAWNS: Array[Dictionary] = [
	{"name": "Bram", "tile": Vector2i(20, 40)},
	{"name": "Cora", "tile": Vector2i(25, 40)},
	{"name": "Edda", "tile": Vector2i(30, 40)},
]

# Phase 4 — sample harvestables. Trees clustered east, rocks south-east.
const SAMPLE_TREES: Array[Vector2i] = [
	Vector2i(58, 30), Vector2i(60, 31), Vector2i(62, 30),
	Vector2i(61, 33), Vector2i(63, 34), Vector2i(59, 35),
]
const SAMPLE_ROCKS: Array[Vector2i] = [
	Vector2i(60, 60), Vector2i(62, 60), Vector2i(63, 62), Vector2i(58, 62),
]

# HaulingProvider re-flow cadence — every 5 sim seconds at 1× (100 ticks).
const HAUL_SWEEP_INTERVAL_TICKS: int = 100

@onready var terrain_layer: TileMapLayer = $Terrain
@onready var floor_layer: TileMapLayer = $Floor
@onready var wall_layer: TileMapLayer = $Wall
@onready var designation_layer: TileMapLayer = $Designation
@onready var roof_layer: TileMapLayer = $Roof
@onready var fog_layer: TileMapLayer = $Fog
@onready var pathfinder: Pathfinder = $Pathfinder
@onready var selection: Selection = $Selection
@onready var rest_provider: RestProvider = $RestProvider
@onready var chop_provider: ChopProvider = $ChopProvider
@onready var mine_provider: MineProvider = $MineProvider
@onready var hauling_provider: HaulingProvider = $HaulingProvider


func _ready() -> void:
	Audit.log("world", "Phase 4 — building %d×%d world + harvestables + AI." % [MAP_SIZE_TILES.x, MAP_SIZE_TILES.y])
	var tileset := _build_placeholder_tileset()
	for layer in [terrain_layer, floor_layer, wall_layer, designation_layer, roof_layer, fog_layer]:
		layer.tile_set = tileset
	_paint_terrain()
	_paint_sample_walls()
	_apply_camera_bounds()

	pathfinder.setup(MAP_SIZE_TILES)
	_wire_walls_to_pathfinder()
	selection.bind(pathfinder)
	World.pathfinder = pathfinder  # expose to entities (Tree.fell() walkability checks, etc.)

	# Register all 4 providers — Decision iterates by .priority desc.
	# chop=5 > mine=4 > haul=3 > rest=0.
	World.register_work_provider(chop_provider)
	World.register_work_provider(mine_provider)
	World.register_work_provider(hauling_provider)
	World.register_work_provider(rest_provider)

	_spawn_sample_pawns()
	_spawn_sample_harvestables()
	_spawn_sample_stockpiles()
	_run_pathfinder_spike()

	# Phase 4: every 5 in-game seconds (100 ticks), re-evaluate items in
	# stockpiles in case a higher-priority destination opened up.
	EventBus.sim_tick.connect(_on_sim_tick_world_sweep)


func world_bounds_px() -> Rect2:
	return Rect2(Vector2.ZERO, Vector2(MAP_SIZE_TILES * TILE_SIZE_PX))


# ── tileset & map painting ──────────────────────────────────────────────────

func _build_placeholder_tileset() -> TileSet:
	# Four 16×16 placeholder tiles laid out as a 4×1 atlas. Real ElvGames
	# art replaces this in Phase 5 (wood walls + stone walls).
	var ts := TileSet.new()
	ts.tile_size = Vector2i(TILE_SIZE_PX, TILE_SIZE_PX)

	var atlas_w := TILE_SIZE_PX * 4
	var img := Image.create(atlas_w, TILE_SIZE_PX, false, Image.FORMAT_RGBA8)
	var palette: Array[Color] = [
		Color(0.45, 0.65, 0.30),  # grass
		Color(0.55, 0.45, 0.30),  # dirt
		Color(0.60, 0.60, 0.55),  # stone
		Color(0.30, 0.30, 0.32),  # stone dark
	]
	for i in palette.size():
		var base: Color = palette[i]
		var border: Color = base.darkened(0.15)
		for px in TILE_SIZE_PX:
			for py in TILE_SIZE_PX:
				var on_border := (
					px == 0 or px == TILE_SIZE_PX - 1
					or py == 0 or py == TILE_SIZE_PX - 1
				)
				img.set_pixel(i * TILE_SIZE_PX + px, py, border if on_border else base)

	var tex := ImageTexture.create_from_image(img)
	var src := TileSetAtlasSource.new()
	src.texture = tex
	src.texture_region_size = Vector2i(TILE_SIZE_PX, TILE_SIZE_PX)
	for i in palette.size():
		src.create_tile(Vector2i(i, 0))
	ts.add_source(src, PLACEHOLDER_SOURCE_ID)
	return ts


func _paint_terrain() -> void:
	for x in MAP_SIZE_TILES.x:
		for y in MAP_SIZE_TILES.y:
			terrain_layer.set_cell(Vector2i(x, y), PLACEHOLDER_SOURCE_ID, TILE_GRASS)


func _paint_sample_walls() -> void:
	var origin := Vector2i(36, 36)
	var size: int = 8
	for i in size:
		wall_layer.set_cell(origin + Vector2i(i, 0), PLACEHOLDER_SOURCE_ID, TILE_STONE)
		wall_layer.set_cell(origin + Vector2i(i, size - 1), PLACEHOLDER_SOURCE_ID, TILE_STONE)
		wall_layer.set_cell(origin + Vector2i(0, i), PLACEHOLDER_SOURCE_ID, TILE_STONE_DARK)
		wall_layer.set_cell(origin + Vector2i(size - 1, i), PLACEHOLDER_SOURCE_ID, TILE_STONE_DARK)


# ── pathfinder + pawns ──────────────────────────────────────────────────────

func _wire_walls_to_pathfinder() -> void:
	var wall_cells := wall_layer.get_used_cells()
	for cell in wall_cells:
		pathfinder.set_cell_walkable(cell, false)
	Audit.log("world", "%d wall cells marked impassable" % wall_cells.size())


func _spawn_sample_pawns() -> void:
	for spawn_data in SAMPLE_PAWNS:
		var p: Pawn = PAWN_SCENE.instantiate()
		add_child(p)
		p.setup(spawn_data["name"], spawn_data["tile"])

		# Phase 3: attach a JobRunner so Decision can hand it jobs.
		var jr := JobRunner.new()
		jr.name = "JobRunner"
		p.add_child(jr)
		jr.setup(p, pathfinder)
		p.job_runner = jr

		World.register_pawn(p)


# ── Phase 4: harvestables + stockpile zones ─────────────────────────────────

func _spawn_sample_harvestables() -> void:
	# Untyped vars — Godot's class-name cache for class_name'd classes is
	# scan-time and intermittently lags behind file changes. Duck typing is
	# safer here and the calls below are all spec'd on the entity types.
	for t_tile in SAMPLE_TREES:
		var tree = TREE_SCENE.instantiate()
		add_child(tree)
		tree.setup(t_tile)
	for r_tile in SAMPLE_ROCKS:
		var rock = ROCK_SCENE.instantiate()
		add_child(rock)
		rock.setup(r_tile)
	Audit.log("world", "spawned %d trees + %d rocks" % [SAMPLE_TREES.size(), SAMPLE_ROCKS.size()])


func _spawn_sample_stockpiles() -> void:
	# Two zones for the Phase 4 acceptance demo:
	#   - Zone A (north): wood-only filter, NORMAL priority (just a wood drop)
	#   - Zone B (south): wildcard, HIGH priority (the "watch wood flow upward" target)
	# When the sweep runs, wood items in Zone A get re-marked for haul and
	# eventually migrate to Zone B.
	var zone_a: StockpileZone = STOCKPILE_SCENE.instantiate()
	add_child(zone_a)
	zone_a.region = Rect2i(15, 55, 4, 4)
	zone_a.label = "Wood (Normal)"
	zone_a.priority = StorageDestination.Priority.NORMAL
	zone_a.accepted_types = [Item.TYPE_WOOD] as Array[StringName]
	zone_a.queue_redraw()

	var zone_b: StockpileZone = STOCKPILE_SCENE.instantiate()
	add_child(zone_b)
	zone_b.region = Rect2i(15, 62, 4, 4)
	zone_b.label = "Anything (High)"
	zone_b.priority = StorageDestination.Priority.HIGH
	zone_b.accepted_types = [] as Array[StringName]  # wildcard
	zone_b.queue_redraw()

	Audit.log("world", "spawned 2 stockpiles: %s + %s" % [zone_a.label, zone_b.label])


# ── periodic re-flow (the "wood floats up" cascade) ─────────────────────────

func _on_sim_tick_world_sweep(tick_n: int) -> void:
	if tick_n % HAUL_SWEEP_INTERVAL_TICKS != 0:
		return
	hauling_provider.sweep_for_better_destinations()


# ── spike: AStarGrid2D query timing at 80² ──────────────────────────────────

func _run_pathfinder_spike() -> void:
	var corners := [
		Vector2i(2, 2),
		Vector2i(MAP_SIZE_TILES.x - 3, 2),
		Vector2i(2, MAP_SIZE_TILES.y - 3),
		Vector2i(MAP_SIZE_TILES.x - 3, MAP_SIZE_TILES.y - 3),
	]
	var pairs: Array = []
	for a in corners:
		for b in corners:
			if a != b:
				pairs.append([a, b])
	var result: Dictionary = pathfinder.benchmark(pairs, 3)
	Audit.log("world", "spike: %d paths min=%d us avg=%.1f us max=%d us" % [
		result["total_paths"], result["min_us"], result["avg_us"], result["max_us"]
	])


# ── camera bounds ───────────────────────────────────────────────────────────

func _apply_camera_bounds() -> void:
	var cam := get_node_or_null("CameraRig")
	if cam == null:
		Audit.log("world", "no CameraRig child yet — bounds set later when camera lands.")
		return
	if not cam.has_method("set_world_bounds"):
		Audit.log("world", "CameraRig present but missing set_world_bounds() — skipping.")
		return
	cam.set_world_bounds(world_bounds_px())