extends Node
## Autoload "ItemDB": item and recipe definitions loaded from data/*.json, plus
## procedurally rendered inventory icons.
##
## Definitions use the same shape as the addon SDK's define_item /
## define_recipe (docs/ADDON_SDK.md), so addon content will later be
## registered through `define_item()` / `define_recipe()` like the base game.

signal icons_ready

const ItemMeshes = preload("res://scripts/items/item_meshes.gd")
const ICON_SIZE := 96

var items: Dictionary = {}     # id -> definition Dictionary
var recipes: Dictionary = {}   # id -> recipe Dictionary (insertion order kept)
var icons: Dictionary = {}     # id -> Texture2D
## Fishing by water type (data/fish.json): {"modifiers": {...}, "waters": {type: {...}}}.
var fishing: Dictionary = {"modifiers": {}, "waters": {}}
var _item_mat: StandardMaterial3D

func _ready() -> void:
	_load("res://data/items.json", "items", define_item)
	_load("res://data/recipes.json", "recipes", define_recipe)
	_load_fishing("res://data/fish.json")
	if DisplayServer.get_name() != "headless":
		_render_icons.call_deferred()

func _load(path: String, key: String, define: Callable) -> void:
	var text := FileAccess.get_file_as_string(path)
	var data = JSON.parse_string(text)
	if typeof(data) != TYPE_DICTIONARY or not data.has(key):
		push_error("ItemDB: could not parse %s" % path)
		return
	for d in data[key]:
		define.call(d)

func define_item(d: Dictionary) -> void:
	for f in ["id", "name", "category", "stack"]:
		if not d.has(f):
			push_error("ItemDB: item missing '%s': %s" % [f, d])
			return
	d.stack = int(d.stack)
	items[d.id] = d

func define_recipe(r: Dictionary) -> void:
	if not items.has(r.get("output", "")):
		push_error("ItemDB: recipe '%s' outputs unknown item" % r.get("id", "?"))
		return
	for id in r.inputs:
		if not items.has(id):
			push_error("ItemDB: recipe '%s' uses unknown item '%s'" % [r.id, id])
			return
	r.count = int(r.get("count", 1))
	r.station = String(r.get("station", ""))
	recipes[r.id] = r

func _load_fishing(path: String) -> void:
	var data = JSON.parse_string(FileAccess.get_file_as_string(path))
	if typeof(data) != TYPE_DICTIONARY or not data.has("waters"):
		push_error("ItemDB: could not parse %s" % path)
		return
	fishing.modifiers = data.get("modifiers", {})
	for water in data.waters:
		define_water(water, data.waters[water])

## Registers (or replaces) the fish for one water type. Same shape an addon
## would use to add, say, a "swamp" water with its own catch.
func define_water(water: String, d: Dictionary) -> void:
	var fish: Array = []
	for f in d.get("fish", []):
		if not items.has(f.get("id", "")):
			push_error("ItemDB: fish '%s' in water '%s' is not an item" % [f.get("id", "?"), water])
			continue
		fish.append({"id": f.id, "weight": float(f.get("weight", 1)), "dawn_dusk": float(f.get("dawn_dusk", f.get("weight", 1)))})
	var w: Array = d.get("bite_wait", [5.0, 14.0])
	fishing.waters[water] = {"min_depth": float(d.get("min_depth", 0.5)), "bite_wait": [float(w[0]), float(w[1])], "fish": fish}

## The fishing table for a water type ({} = nothing to catch there).
func water_fishing(water: String) -> Dictionary:
	return fishing.waters.get(water, {})

func get_item(id: String) -> Dictionary:
	return items.get(id, {})

func item_name(id: String) -> String:
	return items.get(id, {}).get("name", id)

func stack_size(id: String) -> int:
	return int(items.get(id, {}).get("stack", 1))

func mesh_for(id: String) -> ArrayMesh:
	return ItemMeshes.build(items.get(id, {}).get("mesh", id))

## Shared material for item meshes (vertex colours, authored as sRGB).
func item_material() -> StandardMaterial3D:
	if _item_mat == null:
		_item_mat = StandardMaterial3D.new()
		_item_mat.vertex_color_use_as_albedo = true
		_item_mat.vertex_color_is_srgb = true
		_item_mat.roughness = 0.85
	return _item_mat

func icon(id: String) -> Texture2D:
	return icons.get(id, null)

# --- icon renderer ----------------------------------------------------------

## Renders every item mesh once in an offscreen viewport and keeps the images.
func _render_icons() -> void:
	var vp := SubViewport.new()
	vp.size = Vector2i(ICON_SIZE, ICON_SIZE)
	vp.transparent_bg = true
	vp.own_world_3d = true
	vp.msaa_3d = Viewport.MSAA_4X
	vp.render_target_update_mode = SubViewport.UPDATE_ALWAYS
	add_child(vp)

	var env := Environment.new()
	env.background_mode = Environment.BG_CLEAR_COLOR
	env.ambient_light_source = Environment.AMBIENT_SOURCE_COLOR
	env.ambient_light_color = Color(0.75, 0.78, 0.85)
	env.ambient_light_energy = 0.7
	env.tonemap_mode = Environment.TONE_MAPPER_FILMIC
	var we := WorldEnvironment.new()
	we.environment = env
	vp.add_child(we)

	var key := DirectionalLight3D.new()
	key.light_energy = 1.6
	key.rotation = Vector3(deg_to_rad(-50), deg_to_rad(-35), 0)
	vp.add_child(key)
	var fill := DirectionalLight3D.new()
	fill.light_energy = 0.5
	fill.light_color = Color(0.7, 0.8, 1.0)
	fill.rotation = Vector3(deg_to_rad(-20), deg_to_rad(140), 0)
	vp.add_child(fill)

	var cam := Camera3D.new()
	cam.projection = Camera3D.PROJECTION_ORTHOGONAL
	vp.add_child(cam)
	var mi := MeshInstance3D.new()
	mi.material_override = item_material()
	vp.add_child(mi)

	for id in items:
		var mesh := mesh_for(id)
		mi.mesh = mesh
		# Tools are long and thin: tilt them diagonally across the icon.
		var cat: String = items[id].category
		mi.rotation = Vector3(0, 0, deg_to_rad(-45)) if cat in ["tool", "weapon"] else Vector3(0, deg_to_rad(30), 0)
		var aabb := mi.transform * mesh.get_aabb()
		var c := aabb.get_center()
		var extent := maxf(aabb.size.length(), 0.05)
		cam.size = extent * 0.95
		cam.position = c + Vector3(0, 0.55, 1).normalized() * extent * 2.0
		cam.look_at(c, Vector3.UP)
		cam.near = 0.01
		cam.far = extent * 5.0
		await RenderingServer.frame_post_draw
		await RenderingServer.frame_post_draw
		icons[id] = ImageTexture.create_from_image(vp.get_texture().get_image())
	vp.queue_free()
	icons_ready.emit()