extends RefCounted
class_name ItemDB

# ─── Legacy-System (alter Shop / Enemy-Upgrades in game_world.gd) ──────────────
# Bleibt unverändert für Backward-Compat. Wird nur von game_world.gd für
# Enemy-Stat-Boosts ab Welle 10 verwendet.

enum Rarity { COMMON, UNCOMMON, RARE, EPIC }

const RARITY_WEIGHTS: Array = [60, 25, 12, 3]

const RARITY_COLORS: Dictionary = {
	0: Color("#aaaaaa"),   # COMMON
	1: Color("#44ff88"),   # UNCOMMON
	2: Color("#4488ff"),   # RARE
	3: Color("#cc44ff")    # EPIC
}

const RARITY_NAMES: Dictionary = {
	0: "STANDARD",
	1: "SELTEN",
	2: "EPISCH",
	3: "LEGENDÄR"
}

const ITEMS: Array = [
	{
		"id": "thrust_1", "name": "Schubverstärker", "rarity": 0, "cost": 50,
		"desc": "+12% Geschwindigkeit",
		"effects": { "speed_mult": 1.12 }
	},
	{
		"id": "firerate_1", "name": "Schnellfeuer I", "rarity": 0, "cost": 50,
		"desc": "+15% Feuerrate",
		"effects": { "fire_rate_mult": 1.15 }
	},
	{
		"id": "damage_1", "name": "Schwere Ladung I", "rarity": 0, "cost": 50,
		"desc": "+15% Trefferzone",
		"effects": { "damage_mult": 1.15 }
	},
	{
		"id": "shield_1", "name": "Panzerplatte", "rarity": 0, "cost": 55,
		"desc": "+1 Schutzladung",
		"effects": { "shield_charges": 1 }
	},
	{
		"id": "firerate_2", "name": "Schnellfeuer II", "rarity": 1, "cost": 90,
		"desc": "+22% Feuerrate",
		"effects": { "fire_rate_mult": 1.22 }
	},
	{
		"id": "damage_2", "name": "Schwere Ladung II", "rarity": 1, "cost": 100,
		"desc": "+22% Trefferzone  +10% Projektilgeschwindigkeit",
		"effects": { "damage_mult": 1.22, "bullet_speed_mult": 1.10 }
	},
]

# Weighted random roll — Legacy-Shop (wird nicht mehr für Werkstatt verwendet)
static func roll_shop(count: int, _exclude_ids: Array = []) -> Array:
	var pool: Array = []
	for item: Dictionary in ITEMS:
		var w: int = RARITY_WEIGHTS[int(item["rarity"])]
		for _i in w:
			pool.append(item)
	pool.shuffle()
	var result: Array = []
	var seen_ids: Dictionary = {}
	for item: Dictionary in pool:
		var iid: String = item["id"]
		if iid in seen_ids: continue
		seen_ids[iid] = true
		result.append(item)
		if result.size() >= count:
			break
	return result

# ─── Werkstatt-System (Plugin-basiert) ─────────────────────────────────────────
# Auto-Discovery: alle *.gd unter res://items/ die ItemDef erweitern werden
# beim ersten Zugriff registriert.

static var _registry: Array = []
static var _registry_loaded: bool = false

# Static preload list — DirAccess doesn't work in exported builds (compiled scripts
# aren't raw files in the PCK). preload() is resolved at compile time and always works.
const _ITEM_SCRIPTS: Array = [
	preload("res://items/weapons/wk_burst.gd"),
	preload("res://items/weapons/wk_charge.gd"),
	preload("res://items/weapons/wk_ion.gd"),
	preload("res://items/weapons/wk_laser.gd"),
	preload("res://items/weapons/wk_plasma.gd"),
	preload("res://items/weapons/wk_rail.gd"),
	preload("res://items/weapons/wk_scatter.gd"),
	preload("res://items/weapons/wk_shotgun.gd"),
	preload("res://items/weapons/wk_sniper.gd"),
	preload("res://items/hull/hull_giant.gd"),
	preload("res://items/hull/hull_nullfeld.gd"),
	preload("res://items/hull/hull_plating.gd"),
	preload("res://items/hull/hull_reaktor.gd"),
	preload("res://items/drives/drive_overdrive.gd"),
	preload("res://items/drives/drive_quantum.gd"),
	preload("res://items/drives/drive_steer.gd"),
	preload("res://items/special/special_credit_mag.gd"),
	preload("res://items/special/special_wipe_core.gd"),
]

static func _ensure_loaded() -> void:
	if _registry_loaded: return
	_registry_loaded = true
	for script: Script in _ITEM_SCRIPTS:
		if script == null or not script.can_instantiate(): continue
		var inst = script.new()
		if inst is ItemDef and (inst as ItemDef).id != "":
			_registry.append(inst)

static func get_all_defs() -> Array:
	_ensure_loaded()
	return _registry

static func get_def_by_id(id: String) -> ItemDef:
	_ensure_loaded()
	for item in _registry:
		if (item as ItemDef).id == id:
			return item
	return null

# Rolls `count` random items from the Werkstatt pool, excluding given IDs.
static func roll_werkstatt(count: int, exclude_ids: Array = []) -> Array:
	_ensure_loaded()
	var pool: Array = []
	for item in _registry:
		var def := item as ItemDef
		if exclude_ids.has(def.id):
			continue
		pool.append(def)
	pool.shuffle()
	var n: int = min(count, pool.size())
	return pool.slice(0, n)

# ─── Effect-Klassifizierung (für UI-Farbkodierung) ────────────────────────────

static func is_positive_effect(key: String, val) -> bool:
	match key:
		"speed_mult", "turn_mult", "fire_rate_mult", "damage_mult", \
		"bullet_speed_mult", "invuln_mult", "credit_bonus":
			return float(val) >= 1.0
		"bullet_count", "shield_charges":
			return int(val) > 0
		"bh_resist":
			return float(val) > 0.0
		"wipe_mult":
			return float(val) <= 1.0   # kleiner = schneller = besser
	return true

# Menschlich lesbarer Stat-Name für die Vorschau.
static func stat_display_name(key: String) -> String:
	match key:
		"speed_mult":        return "Speed"
		"turn_mult":         return "Wendung"
		"fire_rate_mult":    return "Feuerrate"
		"damage_mult":       return "Schaden"
		"bullet_speed_mult": return "Proj.-Speed"
		"bullet_count":      return "Projektile"
		"shield_charges":    return "Schilde"
		"invuln_mult":       return "Unverwundbar"
		"bh_resist":         return "BH-Resistenz"
		"wipe_mult":         return "Wipe-Ladezeit"
		"credit_bonus":      return "Kreditgewinn"
	return key

static func get_by_id(id: String) -> Dictionary:
	for item: Dictionary in ITEMS:
		if item["id"] == id:
			return item
	return {}