extends "res://scripts/building/piece.gd"
## A charcoal kiln or a smelter: E opens it like a chest. Put what it works
## on inside and it turns it into something else over time, on its own,
## while you're away (docs/PROGRESSION_DESIGN.md §2). It glows while it works.
##
## - Kiln: 2 wood -> 1 charcoal, 20 s.
## - Smelter: 1 iron ore + 1 charcoal -> 1 iron bar, 30 s; or 3 iron
##   nuggets + 1 charcoal -> 1 iron bar.
##
## The output goes into the same slots, for you to take out. On a server it
## runs there (step() is skipped on players' copies) and the contents reach
## everyone like a chest's. Progress is saved.

const SLOTS := 6
const RECIPES := {
	"charcoal_kiln": [{"inputs": {"wood": 2}, "output": "charcoal", "seconds": 20.0}],
	"smelter": [
		{"inputs": {"iron_ore": 1, "charcoal": 1}, "output": "iron_bar", "seconds": 30.0},
		{"inputs": {"iron_nugget": 3, "charcoal": 1}, "output": "iron_bar", "seconds": 30.0},
	],
}

var inventory := Inventory.new(SLOTS)
var progress := 0.0                ## seconds into the current batch
var _light: OmniLight3D
var _glow: MeshInstance3D
var _t := 0.0

func _build() -> void:
	add_to_group("processor")
	inventory.changed.connect(_on_changed)
	if DisplayServer.get_name() == "headless":
		return
	_light = OmniLight3D.new()
	_light.light_color = Color(1.0, 0.55, 0.25)
	_light.omni_range = 5.0
	_light.light_energy = 0.0
	_light.position = Vector3(0, 0.6, 0.5)
	add_child(_light)
	# The fire showing through the mouth.
	_glow = MeshInstance3D.new()
	var q := QuadMesh.new()
	q.size = Vector2(0.36, 0.26)
	_glow.mesh = q
	var m := StandardMaterial3D.new()
	m.shading_mode = BaseMaterial3D.SHADING_MODE_UNSHADED
	m.albedo_color = Color(1.0, 0.45, 0.12)
	m.emission_enabled = true
	m.emission = Color(1.0, 0.45, 0.12)
	m.emission_energy_multiplier = 3.0
	_glow.material_override = m
	_glow.position = Vector3(0, 0.3 if item_id == "smelter" else 0.25, 0.58 if item_id == "smelter" else 0.72)
	_glow.visible = false
	add_child(_glow)

## The recipe it would work on now, or {} (nothing to do, or no room for
## what it makes).
func current() -> Dictionary:
	for r in RECIPES.get(item_id, []):
		if inventory.has_all(r.inputs) and inventory.space_for(r.output) > 0:
			return r
	return {}

func working() -> bool:
	return not current().is_empty()

func _process(delta: float) -> void:
	if WorldNet.is_client():
		_show(working())   # (the server does the work; we just show it)
		return
	step(delta)

## Works for `secs` (several batches if there's time and stuff for them).
func step(secs: float) -> void:
	var r := current()
	if r.is_empty():
		progress = 0.0
		_show(false)
		return
	progress += secs
	while not r.is_empty() and progress >= float(r.seconds):
		progress -= float(r.seconds)
		for id in r.inputs:
			inventory.remove(id, int(r.inputs[id]))
		inventory.add(r.output, 1)
		r = current()
	if r.is_empty():
		progress = 0.0
	_show(not r.is_empty())

func _show(on: bool) -> void:
	if _light == null:
		return
	_t += get_process_delta_time()
	_glow.visible = on
	_light.light_energy = (1.2 + 0.25 * sin(_t * 9.0) * sin(_t * 3.1)) if on else 0.0

func _on_changed() -> void:
	if current().is_empty():
		progress = 0.0

func dismantle_block_reason() -> String:
	for s in inventory.slots:
		if s != null:
			return "Empty it first"
	return ""

func interact_prompt(_player: Node) -> String:
	var r := current()
	var what := "charcoal" if item_id == "charcoal_kiln" else "an iron bar"
	if r.is_empty():
		var needs := "put in wood" if item_id == "charcoal_kiln" else "put in iron ore (or 3 nuggets) and charcoal"
		return "%s (idle: %s)  [E] Open" % [display_name(), needs]
	if WorldNet.is_client():
		return "%s (making %s)  [E] Open" % [display_name(), what]
	return "%s (making %s, %d s)  [E] Open" % [display_name(), what, ceili(float(r.seconds) - progress)]

func interact(player: Node) -> void:
	player.open_inventory(self)

func save_extra() -> Dictionary:
	return {"progress": progress}

func load_extra(d: Dictionary) -> void:
	progress = float(d.get("progress", 0.0))